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Ajouter le résultat dans votre panierUltra-low power control system for maximal energy harvesting from short duration vibrations / Krishna Vijayaraghavan in IEEE Transactions on control systems technology, Vol. 18 N° 2 (Mars 2010)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 252-266
Titre : Ultra-low power control system for maximal energy harvesting from short duration vibrations Type de document : texte imprimé Auteurs : Krishna Vijayaraghavan, Auteur ; Rajamani, Rajesh, Auteur Année de publication : 2011 Article en page(s) : pp. 252-266 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Battery-less Energy harvesting Optimal vibration energy harvesting Short duration vibrations standalone sensors Traffic sensor Ultra-low power control systems Wireless Index. décimale : 629.1 Résumé : With the advent of ultra-low power sensor packages, there is renewed interest in harvesting vibration energy to power them, thus creating a self sustaining battery-less sensor system. The optimal algorithms previously developed in literature to harvest vibration energy are complex and hence require controllers that consume a significant amount of power. The relatively high power requirement combined with the inherent complex design of these algorithms would also limit them to only applications in which sustained vibration energy is available for harvesting. To address these issues, this paper presents new control systems to optimize the amount of energy harvested from short duration vibrations. Only algorithms that can be implemented using simple ultra-low power analog electronic components are considered. The first algorithm termed ??fixed threshold switching??, has been adapted from literature on harvesting energy from sustained vibration. The second and third algorithms are new optimal control algorithms termed ??maximum voltage switching?? and ??switched inductor??, respectively. The three algorithms are theoretically evaluated and compared for a short duration vibration application. The final section of this paper presents experimental results from the implementation of all the three algorithms on a new battery-less wireless traffic sensor.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5169971 [article] Ultra-low power control system for maximal energy harvesting from short duration vibrations [texte imprimé] / Krishna Vijayaraghavan, Auteur ; Rajamani, Rajesh, Auteur . - 2011 . - pp. 252-266.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 252-266
Mots-clés : Battery-less Energy harvesting Optimal vibration energy harvesting Short duration vibrations standalone sensors Traffic sensor Ultra-low power control systems Wireless Index. décimale : 629.1 Résumé : With the advent of ultra-low power sensor packages, there is renewed interest in harvesting vibration energy to power them, thus creating a self sustaining battery-less sensor system. The optimal algorithms previously developed in literature to harvest vibration energy are complex and hence require controllers that consume a significant amount of power. The relatively high power requirement combined with the inherent complex design of these algorithms would also limit them to only applications in which sustained vibration energy is available for harvesting. To address these issues, this paper presents new control systems to optimize the amount of energy harvested from short duration vibrations. Only algorithms that can be implemented using simple ultra-low power analog electronic components are considered. The first algorithm termed ??fixed threshold switching??, has been adapted from literature on harvesting energy from sustained vibration. The second and third algorithms are new optimal control algorithms termed ??maximum voltage switching?? and ??switched inductor??, respectively. The three algorithms are theoretically evaluated and compared for a short duration vibration application. The final section of this paper presents experimental results from the implementation of all the three algorithms on a new battery-less wireless traffic sensor.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5169971
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 267-278
Titre : Fast model predictive control using online optimization Type de document : texte imprimé Auteurs : Yang Wang, Auteur ; Stephen Boyd, Auteur Année de publication : 2011 Article en page(s) : pp. 267-278 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Model predictive control (MPC) Real-time convex optimization Index. décimale : 629.1 Résumé : A widely recognized shortcoming of model predictive control (MPC) is that it can usually only be used in applications with slow dynamics, where the sample time is measured in seconds or minutes. A well-known technique for implementing fast MPC is to compute the entire control law offline, in which case the online controller can be implemented as a lookup table. This method works well for systems with small state and input dimensions (say, no more than five), few constraints, and short time horizons. In this paper, we describe a collection of methods for improving the speed of MPC, using online optimization. These custom methods, which exploit the particular structure of the MPC problem, can compute the control action on the order of 100 times faster than a method that uses a generic optimizer. As an example, our method computes the control actions for a problem with 12 states, 3 controls, and horizon of 30 time steps (which entails solving a quadratic program with 450 variables and 1284 constraints) in around 5 ms, allowing MPC to be carried out at 200 Hz.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5153127 [article] Fast model predictive control using online optimization [texte imprimé] / Yang Wang, Auteur ; Stephen Boyd, Auteur . - 2011 . - pp. 267-278.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 267-278
Mots-clés : Model predictive control (MPC) Real-time convex optimization Index. décimale : 629.1 Résumé : A widely recognized shortcoming of model predictive control (MPC) is that it can usually only be used in applications with slow dynamics, where the sample time is measured in seconds or minutes. A well-known technique for implementing fast MPC is to compute the entire control law offline, in which case the online controller can be implemented as a lookup table. This method works well for systems with small state and input dimensions (say, no more than five), few constraints, and short time horizons. In this paper, we describe a collection of methods for improving the speed of MPC, using online optimization. These custom methods, which exploit the particular structure of the MPC problem, can compute the control action on the order of 100 times faster than a method that uses a generic optimizer. As an example, our method computes the control actions for a problem with 12 states, 3 controls, and horizon of 30 time steps (which entails solving a quadratic program with 450 variables and 1284 constraints) in around 5 ms, allowing MPC to be carried out at 200 Hz.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5153127
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 279-293
Titre : High altitude wind energy generation using controlled power kites Type de document : texte imprimé Auteurs : Massimo Canale, Auteur ; Lorenzo Fagiano, Auteur ; Mario Milanese, Auteur Année de publication : 2011 Article en page(s) : pp. 279-293 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Constrained control Nonlinear systems Predictive control Renewable energy Wind energy Index. décimale : 629.1 Résumé : This paper presents simulation and experimental results regarding a new class of wind energy generators, denoted as KiteGen, which employ power kites to capture high altitude wind power. A realistic kite model, which includes the kite aerodynamic characteristics and the effects of line weight and drag forces, is used to describe the system dynamics. Nonlinear model predictive control techniques, together with an efficient implementation based on set membership function approximation theory, are employed to maximize the energy obtained by KiteGen, while satisfying input and state constraints. Two different kinds of KiteGen are investigated through numerical simulations, the yo-yo configuration and the carousel configuration, respectively. For each configuration, a generator with the same kite and nominal wind characteristics is considered. A novel control strategy for the carousel configuration, with respect to previous works, is also introduced. The simulation results show that the power generation potentials of the yo-yo and carousel configurations are very similar. Thus, the choice between these two configurations for further development of a medium-to-large scale generator will be made on the basis of technical implementation problems and of other indexes like construction costs and generated power density with respect to land occupation. Experimental data, collected using the small-scale KiteGen prototype built at Politecnico di Torino, are compared to simulation results. The good matching between simulation and real measured data increases the confidence with the presented simulation results, which show that energy generation with controlled power kites can represent a quantum leap in wind power technology, promising to obtain renewable energy from a source largely available almost everywhere, with production costs lower than those of fossil sources.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152910 [article] High altitude wind energy generation using controlled power kites [texte imprimé] / Massimo Canale, Auteur ; Lorenzo Fagiano, Auteur ; Mario Milanese, Auteur . - 2011 . - pp. 279-293.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 279-293
Mots-clés : Constrained control Nonlinear systems Predictive control Renewable energy Wind energy Index. décimale : 629.1 Résumé : This paper presents simulation and experimental results regarding a new class of wind energy generators, denoted as KiteGen, which employ power kites to capture high altitude wind power. A realistic kite model, which includes the kite aerodynamic characteristics and the effects of line weight and drag forces, is used to describe the system dynamics. Nonlinear model predictive control techniques, together with an efficient implementation based on set membership function approximation theory, are employed to maximize the energy obtained by KiteGen, while satisfying input and state constraints. Two different kinds of KiteGen are investigated through numerical simulations, the yo-yo configuration and the carousel configuration, respectively. For each configuration, a generator with the same kite and nominal wind characteristics is considered. A novel control strategy for the carousel configuration, with respect to previous works, is also introduced. The simulation results show that the power generation potentials of the yo-yo and carousel configurations are very similar. Thus, the choice between these two configurations for further development of a medium-to-large scale generator will be made on the basis of technical implementation problems and of other indexes like construction costs and generated power density with respect to land occupation. Experimental data, collected using the small-scale KiteGen prototype built at Politecnico di Torino, are compared to simulation results. The good matching between simulation and real measured data increases the confidence with the presented simulation results, which show that energy generation with controlled power kites can represent a quantum leap in wind power technology, promising to obtain renewable energy from a source largely available almost everywhere, with production costs lower than those of fossil sources.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152910
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 294-306
Titre : A unified control scheme for track seeking and following of a hard disk drive servo system Type de document : texte imprimé Auteurs : Chin Kwan Thum, Auteur ; Chunling Du, Auteur ; Chen, Ben M., Auteur Année de publication : 2011 Article en page(s) : pp. 294-306 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Hard disk drives (HDDs) Mechatronics Mode switching Nonlinear time-varying systems (NLTV) Servo systems Index. décimale : 629.1 Résumé : This paper proposes a new nonlinear time-varying unified control scheme (UCS) for track-seeking and track-following in hard disk drives (HDDs) so as to avoid problem of mode switching. The proposed control scheme utilizes the concept of the conventional composite nonlinear feedback (CNF) scheme to achieve fast and smooth seeking. In order to be advantageous over the conventional CNF control, the UCS consists of both linear and nonlinear time-dependent components, which are independent of absolute seeking error. Simulation and implementation results show that, during track-seeking mode, the proposed scheme has a significantly better performance robustness against variations in seek length as compared to the conventional CNF control. For track-following, disturbance and noise models are involved in the problem formulation and sub-optimal H ?? method is used to design the controller so as to achieve high head-positioning accuracy. It turns out that the unified controller removes 27.8% of the nonrepeatable disturbances and noise.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152960 [article] A unified control scheme for track seeking and following of a hard disk drive servo system [texte imprimé] / Chin Kwan Thum, Auteur ; Chunling Du, Auteur ; Chen, Ben M., Auteur . - 2011 . - pp. 294-306.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 294-306
Mots-clés : Hard disk drives (HDDs) Mechatronics Mode switching Nonlinear time-varying systems (NLTV) Servo systems Index. décimale : 629.1 Résumé : This paper proposes a new nonlinear time-varying unified control scheme (UCS) for track-seeking and track-following in hard disk drives (HDDs) so as to avoid problem of mode switching. The proposed control scheme utilizes the concept of the conventional composite nonlinear feedback (CNF) scheme to achieve fast and smooth seeking. In order to be advantageous over the conventional CNF control, the UCS consists of both linear and nonlinear time-dependent components, which are independent of absolute seeking error. Simulation and implementation results show that, during track-seeking mode, the proposed scheme has a significantly better performance robustness against variations in seek length as compared to the conventional CNF control. For track-following, disturbance and noise models are involved in the problem formulation and sub-optimal H ?? method is used to design the controller so as to achieve high head-positioning accuracy. It turns out that the unified controller removes 27.8% of the nonrepeatable disturbances and noise.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152960
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 307-322
Titre : On the force control of Kinematically defective manipulators interacting with an unknown environment Type de document : texte imprimé Auteurs : Nabil Zemiti, Auteur ; Guillaume Morel, Auteur ; Alain Micaelli, Auteur Année de publication : 2011 Article en page(s) : pp. 307-322 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Defective manipulators Force control Kinematic Constraints Passivity Surgical robotics Index. décimale : 629.1 Résumé : In this paper, the problem of force feedback control of kinematically defective manipulators (KDMs) is considered. KDMs are robot manipulators that have fewer joints than the dimension of the space in which their end-effector moves. It is well known that controlling the end-effector velocity of an n-joint KDM can be easily solved by appropriately selecting n components of the output twist, thus squaring the control problem. On the contrary, we show that such a component selection approach is not appropriate in general to solve the force control problem for KDMs. In particular, for advanced force control applications, such as comanipulation, where the contact geometry is not known in advance, the selection of the wrench components leads to a lack of passivity, which in turn may induce instability. This instability does not arise from the system dynamics. Rather, it can be viewed as a new form of kinematic instability. Moreover, by formulating the problem in the joint space, we show how to properly design a stable force controller for KDMs subject to arbitrary external forces applied to their end-effector. Furthermore, we propose several implementations for pure force control and damping control. Experimental results with a kinematically defective laparoscopic comanipulator illustrate these propositions.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5153129 [article] On the force control of Kinematically defective manipulators interacting with an unknown environment [texte imprimé] / Nabil Zemiti, Auteur ; Guillaume Morel, Auteur ; Alain Micaelli, Auteur . - 2011 . - pp. 307-322.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 307-322
Mots-clés : Defective manipulators Force control Kinematic Constraints Passivity Surgical robotics Index. décimale : 629.1 Résumé : In this paper, the problem of force feedback control of kinematically defective manipulators (KDMs) is considered. KDMs are robot manipulators that have fewer joints than the dimension of the space in which their end-effector moves. It is well known that controlling the end-effector velocity of an n-joint KDM can be easily solved by appropriately selecting n components of the output twist, thus squaring the control problem. On the contrary, we show that such a component selection approach is not appropriate in general to solve the force control problem for KDMs. In particular, for advanced force control applications, such as comanipulation, where the contact geometry is not known in advance, the selection of the wrench components leads to a lack of passivity, which in turn may induce instability. This instability does not arise from the system dynamics. Rather, it can be viewed as a new form of kinematic instability. Moreover, by formulating the problem in the joint space, we show how to properly design a stable force controller for KDMs subject to arbitrary external forces applied to their end-effector. Furthermore, we propose several implementations for pure force control and damping control. Experimental results with a kinematically defective laparoscopic comanipulator illustrate these propositions.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5153129
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 323-335
Titre : Formal framework for nonlinear control of PWM AC/DC boost rectifiers : controller design and average performance analysis Type de document : texte imprimé Auteurs : Fouad Giri, Auteur ; Abdelmajid Abouloifa, Auteur ; Ibtessam Lachkar, Auteur Année de publication : 2011 Article en page(s) : pp. 323-335 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : AC/DC switched power converters Average performances Nonlinear control Power factor correction Stability Voltage regulation Index. décimale : 629.1 Résumé : We are considering the problem of controlling filtered AC/DC switched power converters of the boost type. The control objectives are twofold: 1) guaranteeing a regulated voltage for the supplied load and 2) enforcing power factor correction (PFC) with respect to the main supply network. The considered problem is dealt with using a double-loop controller developed on the basis of the system nonlinear model. The inner-loop is designed by the backstepping technique to cope with the PFC issue. The outer-loop is designed to regulate the converter output voltage. Experimental tests show that the proposed controller actually meets the objectives it is designed for. While similar performances have been experimentally demonstrated, for different converters and controllers, it is the first time that a complete and rigorous formal analysis, based on averaging theory, is developed to describe the observed performances (PFC and output voltage ripples). As a matter of fact, the averaging theory constitutes the natural framework to analyzing the performances due to the periodic nature of the system input signals.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5208202 [article] Formal framework for nonlinear control of PWM AC/DC boost rectifiers : controller design and average performance analysis [texte imprimé] / Fouad Giri, Auteur ; Abdelmajid Abouloifa, Auteur ; Ibtessam Lachkar, Auteur . - 2011 . - pp. 323-335.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 323-335
Mots-clés : AC/DC switched power converters Average performances Nonlinear control Power factor correction Stability Voltage regulation Index. décimale : 629.1 Résumé : We are considering the problem of controlling filtered AC/DC switched power converters of the boost type. The control objectives are twofold: 1) guaranteeing a regulated voltage for the supplied load and 2) enforcing power factor correction (PFC) with respect to the main supply network. The considered problem is dealt with using a double-loop controller developed on the basis of the system nonlinear model. The inner-loop is designed by the backstepping technique to cope with the PFC issue. The outer-loop is designed to regulate the converter output voltage. Experimental tests show that the proposed controller actually meets the objectives it is designed for. While similar performances have been experimentally demonstrated, for different converters and controllers, it is the first time that a complete and rigorous formal analysis, based on averaging theory, is developed to describe the observed performances (PFC and output voltage ripples). As a matter of fact, the averaging theory constitutes the natural framework to analyzing the performances due to the periodic nature of the system input signals.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5208202
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 336-351
Titre : Combined H (infinity) -feedback control and iterative learning control design with application to nanopositioning systems Type de document : texte imprimé Auteurs : Brian E. Helfrich, Auteur ; Chibum Lee, Auteur ; Douglas A. Bristow, Auteur Année de publication : 2011 Article en page(s) : pp. 336-351 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Iterative learning control (ILC) Nanopositioning Precision motion control (PMC) Index. décimale : 629.1 Résumé : This paper examines a coordinated feedback and feedforward control design strategy for precision motion control (PMC) systems. It is assumed that the primary exogenous signals are repeated; including disturbances and references. Therefore, an iterative learning control (ILC) feedforward strategy can be used. The introduction of additional non-repeating exogenous signals, including disturbances, noise, and reset errors, necessitates the proper coordination between feedback and feedforward controllers to achieve high performance. A novel ratio of repeated versus non-repeated signal power in the frequency domain is introduced and defined as the repetitive-to-non-repetitive (RNR) ratio. This frequency specific ratio allows for a new approach to delegating feedback and feedforward control efforts based on RNR value. A systematic procedure for control design is given whereby the feedback addresses the non-repeating exogenous signal content (RNR ≪ 0 dB) and the feedforward ILC addresses the repeating signal content (RNR ≫ 0 dB). To illustrate the design approach, two case studies using different nano-positioning devices are given.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5169845 [article] Combined H (infinity) -feedback control and iterative learning control design with application to nanopositioning systems [texte imprimé] / Brian E. Helfrich, Auteur ; Chibum Lee, Auteur ; Douglas A. Bristow, Auteur . - 2011 . - pp. 336-351.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 336-351
Mots-clés : Iterative learning control (ILC) Nanopositioning Precision motion control (PMC) Index. décimale : 629.1 Résumé : This paper examines a coordinated feedback and feedforward control design strategy for precision motion control (PMC) systems. It is assumed that the primary exogenous signals are repeated; including disturbances and references. Therefore, an iterative learning control (ILC) feedforward strategy can be used. The introduction of additional non-repeating exogenous signals, including disturbances, noise, and reset errors, necessitates the proper coordination between feedback and feedforward controllers to achieve high performance. A novel ratio of repeated versus non-repeated signal power in the frequency domain is introduced and defined as the repetitive-to-non-repetitive (RNR) ratio. This frequency specific ratio allows for a new approach to delegating feedback and feedforward control efforts based on RNR value. A systematic procedure for control design is given whereby the feedback addresses the non-repeating exogenous signal content (RNR ≪ 0 dB) and the feedforward ILC addresses the repeating signal content (RNR ≫ 0 dB). To illustrate the design approach, two case studies using different nano-positioning devices are given.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5169845
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 352-367
Titre : Feedback control structures, embedded residual signals, and feedback control schemes with an integrated residual access Type de document : texte imprimé Auteurs : S. X. Ding, Auteur ; G. Yang, Auteur ; P. Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 352-367 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Automotive systems Fault detection Feedback systems Observer Residual generation Index. décimale : 629.1 Résumé : Driven by the increasing needs for the integration of model-based fault diagnosis into the electronic control units (ECUs) with limited computation capacity and motivated by the recent study on the fault tolerant controller architecture, we investigate feedback controller structures aiming at accessing the residuals embedded in the control loops. For this purpose, we first develop an observer-based realization of the Youla parameterization. This result reveals a new interpretation of control signals as a composite of the residual and reference signals. From this viewpoint, different control schemes are studied and useful relationships between the controller structures and embedded residual signals are established. It leads to the development of two kinds of schemes: 1) extracting residual signals from an existing control loop and 2) configuring control loops with an integrated residual access. The achieved results are demonstrated by two examples of the feedback control loops in engine management systems.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152954 [article] Feedback control structures, embedded residual signals, and feedback control schemes with an integrated residual access [texte imprimé] / S. X. Ding, Auteur ; G. Yang, Auteur ; P. Zhang, Auteur . - 2011 . - pp. 352-367.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 352-367
Mots-clés : Automotive systems Fault detection Feedback systems Observer Residual generation Index. décimale : 629.1 Résumé : Driven by the increasing needs for the integration of model-based fault diagnosis into the electronic control units (ECUs) with limited computation capacity and motivated by the recent study on the fault tolerant controller architecture, we investigate feedback controller structures aiming at accessing the residuals embedded in the control loops. For this purpose, we first develop an observer-based realization of the Youla parameterization. This result reveals a new interpretation of control signals as a composite of the residual and reference signals. From this viewpoint, different control schemes are studied and useful relationships between the controller structures and embedded residual signals are established. It leads to the development of two kinds of schemes: 1) extracting residual signals from an existing control loop and 2) configuring control loops with an integrated residual access. The achieved results are demonstrated by two examples of the feedback control loops in engine management systems.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152954
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 368-382
Titre : Saturation-induced instability and its avoidance in adaptive control of hard disk drives Type de document : texte imprimé Auteurs : Néstor O. Perez-Arancibia, Auteur ; Tsu-Chin, Tsao, Auteur ; James S. Gibson, Auteur Année de publication : 2011 Article en page(s) : pp. 368-382 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Control-signal saturation Frequency weighting Hard disk drive (HDD) Iterative adaptative tuning Minimum variance adaptive control Index. décimale : 629.1 Résumé : This paper presents an investigation of the design and implementation of minimum-variance adaptive controllers for computer hard disk drive (HDD) read-write track following. A common characteristic of minimum-variance controllers, adaptive or not, is that they rely on prediction filters with large high- frequency gains to predict broadband disturbances, and this often produces control-signal saturation and eventual loss of stability. Two methods are introduced here to address this issue. The first method, suitable for online adaptive control, uses frequency weighting to constrain the high-frequency gain of the prediction filter. The second method, suitable for tuning fixed-gain controllers, employs an adaptive scheme iteratively over a finite duration. Both methods were implemented on a commercial hard disk drive, and experimental results demonstrate their effectiveness.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229135 [article] Saturation-induced instability and its avoidance in adaptive control of hard disk drives [texte imprimé] / Néstor O. Perez-Arancibia, Auteur ; Tsu-Chin, Tsao, Auteur ; James S. Gibson, Auteur . - 2011 . - pp. 368-382.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 368-382
Mots-clés : Control-signal saturation Frequency weighting Hard disk drive (HDD) Iterative adaptative tuning Minimum variance adaptive control Index. décimale : 629.1 Résumé : This paper presents an investigation of the design and implementation of minimum-variance adaptive controllers for computer hard disk drive (HDD) read-write track following. A common characteristic of minimum-variance controllers, adaptive or not, is that they rely on prediction filters with large high- frequency gains to predict broadband disturbances, and this often produces control-signal saturation and eventual loss of stability. Two methods are introduced here to address this issue. The first method, suitable for online adaptive control, uses frequency weighting to constrain the high-frequency gain of the prediction filter. The second method, suitable for tuning fixed-gain controllers, employs an adaptive scheme iteratively over a finite duration. Both methods were implemented on a commercial hard disk drive, and experimental results demonstrate their effectiveness.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229135
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 383-392
Titre : Distributed cooperative attitude synchronization and tracking for multiple rigid bodies Type de document : texte imprimé Auteurs : Wei Ren, Auteur Année de publication : 2011 Article en page(s) : pp. 383-392 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Attitude synchronization Cooperative control Distributed algorithms Multi-vehicule systems Index. décimale : 629.1 Résumé : In this paper, distributed cooperative attitude synchronization and tracking problems are considered for multiple rigid bodies with attitudes represented by modified rodriguez parameters. Two distributed control laws are proposed and analyzed. The first control law applies a passivity approach for distributed attitude synchronization. The control law guarantees attitude synchronization without the requirement for absolute angular velocity measurements and relative angular velocity measurements between neighboring rigid bodies. The second control law incorporates a time-varying reference attitude, where the reference attitude is allowed to be available to only a subset of the group members under general directed information exchange. The control law guarantees that all rigid bodies track the time-varying reference attitude as long as a virtual leader whose attitude is the time-varying reference attitude has a directed path to all other rigid bodies in the group. Simulation results are presented to demonstrate the effectiveness of the two control laws.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229134 [article] Distributed cooperative attitude synchronization and tracking for multiple rigid bodies [texte imprimé] / Wei Ren, Auteur . - 2011 . - pp. 383-392.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 383-392
Mots-clés : Attitude synchronization Cooperative control Distributed algorithms Multi-vehicule systems Index. décimale : 629.1 Résumé : In this paper, distributed cooperative attitude synchronization and tracking problems are considered for multiple rigid bodies with attitudes represented by modified rodriguez parameters. Two distributed control laws are proposed and analyzed. The first control law applies a passivity approach for distributed attitude synchronization. The control law guarantees attitude synchronization without the requirement for absolute angular velocity measurements and relative angular velocity measurements between neighboring rigid bodies. The second control law incorporates a time-varying reference attitude, where the reference attitude is allowed to be available to only a subset of the group members under general directed information exchange. The control law guarantees that all rigid bodies track the time-varying reference attitude as long as a virtual leader whose attitude is the time-varying reference attitude has a directed path to all other rigid bodies in the group. Simulation results are presented to demonstrate the effectiveness of the two control laws.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229134
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 393-404
Titre : Control relevant blind identification of disturbances with application to a multivariable active vibration isolation platform Type de document : texte imprimé Auteurs : Matthijs Boerlage, Auteur ; Bram de Jager, Auteur ; Maarten Steinbuch, Auteur Année de publication : 2011 Article en page(s) : pp. 393-404 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Blind identification Disturbances Independent component analysis Multivariable control Principal component analysis Index. décimale : 629.1 Résumé : This paper deals with the identification of root causes of disturbances in multivariable systems. It is shown that this boils down to a blind identification problem that can be solved, under additional assumptions, within certain indeterminacies. Using the results from identification, it is illustrated how sources can be physically interpreted and the location of the sources can be recovered. Also, a design tool is developed to select multivariable feedback controller candidates. The practical feasibility is demonstrated on an industrial multivariable controlled active vibration isolation platform.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5291699 [article] Control relevant blind identification of disturbances with application to a multivariable active vibration isolation platform [texte imprimé] / Matthijs Boerlage, Auteur ; Bram de Jager, Auteur ; Maarten Steinbuch, Auteur . - 2011 . - pp. 393-404.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 393-404
Mots-clés : Blind identification Disturbances Independent component analysis Multivariable control Principal component analysis Index. décimale : 629.1 Résumé : This paper deals with the identification of root causes of disturbances in multivariable systems. It is shown that this boils down to a blind identification problem that can be solved, under additional assumptions, within certain indeterminacies. Using the results from identification, it is illustrated how sources can be physically interpreted and the location of the sources can be recovered. Also, a design tool is developed to select multivariable feedback controller candidates. The practical feasibility is demonstrated on an industrial multivariable controlled active vibration isolation platform.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5291699
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 405-413
Titre : Modeling and control of thermal printing Type de document : texte imprimé Auteurs : Kristian Nolde, Auteur ; Manfred Morari, Auteur Année de publication : 2011 Article en page(s) : pp. 405-413 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Lookup table Model predictive control Printhead control Switched system Thermal printing Wiener model Index. décimale : 629.1 Résumé : In this paper, we present the development of an optimal controller for thermal printheads. A first-order linear system and a nonlinear output mapping with stochastic noise is proposed as a model of the printing dynamics. The model parameters are identified and an optimal control problem is formulated to determine the printhead input. The control algorithm is successfully tested on a standard thermal printer. A sensitivity analysis is performed by simulations and experiments to analyze the printing quality on varying setups with different printheads, printing media and ribbons. A tuning strategy is derived to adapt to changing setups without having to recompute an optimization problem. The performance of the control system for a wide range of operating systems is observed in experiments. Comparing the proposed controller to a current control implementation shows a significant quality gain in barcode readability (ISO/IEC 15416).
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152951 [article] Modeling and control of thermal printing [texte imprimé] / Kristian Nolde, Auteur ; Manfred Morari, Auteur . - 2011 . - pp. 405-413.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 405-413
Mots-clés : Lookup table Model predictive control Printhead control Switched system Thermal printing Wiener model Index. décimale : 629.1 Résumé : In this paper, we present the development of an optimal controller for thermal printheads. A first-order linear system and a nonlinear output mapping with stochastic noise is proposed as a model of the printing dynamics. The model parameters are identified and an optimal control problem is formulated to determine the printhead input. The control algorithm is successfully tested on a standard thermal printer. A sensitivity analysis is performed by simulations and experiments to analyze the printing quality on varying setups with different printheads, printing media and ribbons. A tuning strategy is derived to adapt to changing setups without having to recompute an optimization problem. The performance of the control system for a wide range of operating systems is observed in experiments. Comparing the proposed controller to a current control implementation shows a significant quality gain in barcode readability (ISO/IEC 15416).
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152951
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 414-429
Titre : Coordination of operations by relation extraction for manufacturing cell controllers Type de document : texte imprimé Auteurs : Kristin Andersson, Auteur ; Johan Richardsson, Auteur ; Bengt Lennartson, Auteur Année de publication : 2011 Article en page(s) : pp. 414-429 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Discrete event systems Flexible manufacturing systems Maintenance Programmable logic control (PLC) Sequence of operations Index. décimale : 629.1 Résumé : A method for generation of the control function for flexible manufacturing cells is presented in this paper. The control function is separated from the rest of the programmable logic control (PLC) program, and partitioned into a high-level part handling the operation sequence and a low-level part defining the execution process of the operations. The program structure enables high-level supervisor synthesis, which alleviates the state-space explosion problem. Information present in earlier steps of the development process is reused and processed, to automatically generate the automata needed for supervisor synthesis. An algorithm for generating automata, from the low-level safety requirements that restrict the high-level behavior, is presented. Algorithms are also presented for extracting the relations between the operations defining the work in the cell, from the synthesized supervisor. These relations give an easy-to-read representation of the control function that makes it interpretable by machine operators and maintenance personnel, an important feature to make the method applicable in an industrial setting. Hence, the control function generated by our method combines the benefits of a traditional supervisor, namely optimality and flexibility, with simplicity and clarity.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5282516 [article] Coordination of operations by relation extraction for manufacturing cell controllers [texte imprimé] / Kristin Andersson, Auteur ; Johan Richardsson, Auteur ; Bengt Lennartson, Auteur . - 2011 . - pp. 414-429.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 414-429
Mots-clés : Discrete event systems Flexible manufacturing systems Maintenance Programmable logic control (PLC) Sequence of operations Index. décimale : 629.1 Résumé : A method for generation of the control function for flexible manufacturing cells is presented in this paper. The control function is separated from the rest of the programmable logic control (PLC) program, and partitioned into a high-level part handling the operation sequence and a low-level part defining the execution process of the operations. The program structure enables high-level supervisor synthesis, which alleviates the state-space explosion problem. Information present in earlier steps of the development process is reused and processed, to automatically generate the automata needed for supervisor synthesis. An algorithm for generating automata, from the low-level safety requirements that restrict the high-level behavior, is presented. Algorithms are also presented for extracting the relations between the operations defining the work in the cell, from the synthesized supervisor. These relations give an easy-to-read representation of the control function that makes it interpretable by machine operators and maintenance personnel, an important feature to make the method applicable in an industrial setting. Hence, the control function generated by our method combines the benefits of a traditional supervisor, namely optimality and flexibility, with simplicity and clarity.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5282516
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 430-437
Titre : Fault detection and isolation of induction motors using recurrent neural networks and dynamic bayesian modeling Type de document : texte imprimé Auteurs : Hyun Cheol Cho, Auteur ; Jeremy Knowles, Auteur ; M. Sami Fadali, Auteur Année de publication : 2011 Article en page(s) : pp. 430-437 Note générale : Génie Aérospatial Langues : Anglais (eng) Index. décimale : 629.1 Résumé : Dynamic neural models provide an attractive means of fault detection and isolation in industrial process. One approach is to create a neural model to emulate normal system behavior and additional models to emulate various fault conditions. The neural models are then placed in parallel with the system to be monitored, and fault detection is achieved by comparing the outputs of the neural models with the real system outputs. Neural network training is achieved using simultaneous perturbation stochastic approximation (SPSA). Fault classification is based on a simple threshold test of the residuals formed by subtracting each neural model output from the corresponding output of the real system. We present a new approach based on this well known scheme where a Bayesian network is used to evaluate the residuals. The approach is applied to fault detection in a three-phase induction motor.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152950 [article] Fault detection and isolation of induction motors using recurrent neural networks and dynamic bayesian modeling [texte imprimé] / Hyun Cheol Cho, Auteur ; Jeremy Knowles, Auteur ; M. Sami Fadali, Auteur . - 2011 . - pp. 430-437.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 430-437
Index. décimale : 629.1 Résumé : Dynamic neural models provide an attractive means of fault detection and isolation in industrial process. One approach is to create a neural model to emulate normal system behavior and additional models to emulate various fault conditions. The neural models are then placed in parallel with the system to be monitored, and fault detection is achieved by comparing the outputs of the neural models with the real system outputs. Neural network training is achieved using simultaneous perturbation stochastic approximation (SPSA). Fault classification is based on a simple threshold test of the residuals formed by subtracting each neural model output from the corresponding output of the real system. We present a new approach based on this well known scheme where a Bayesian network is used to evaluate the residuals. The approach is applied to fault detection in a three-phase induction motor.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152950
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 438-445
Titre : Development of high performance aircraft bleed air temperature control system with reduced ram air usage Type de document : texte imprimé Auteurs : Lan Shang, Auteur ; Guangjun Liu, Auteur ; Peter Hodal, Auteur Année de publication : 2011 Article en page(s) : pp. 438-445 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Aircraft Bleed air Optimal control Ram air Temperature control Index. décimale : 629.1 Résumé : Conventional aircraft engine bleed air temperature regulation system is inefficient due to unnecessary ram air usage in cooling the bleed air, which in turn causes unnecessary drag and fuel consumption. This paper proposes an aircraft bleed air temperature control system, aiming at minimizing the ram air usage to reduce drag and fuel consumption while maintaining fast temperature control response. To achieve both of the objectives, a new control system configuration is developed to control both ram air and bypass flows in such a way that the bypass bleed air flow is automatically controlled at a small level that is just sufficient to maintain fast regulation of the flow temperature at the load. Analytical equations describing the system dynamics and linearized model are derived and utilized in the overall bleed air temperature control design and analysis. PI control and optimal output feedback are investigated. Computer simulations and experiments have been conducted, and the proposed control system is shown to be effective in reducing ram air usage and maintaining fast temperature control response in the meantime.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5175286 [article] Development of high performance aircraft bleed air temperature control system with reduced ram air usage [texte imprimé] / Lan Shang, Auteur ; Guangjun Liu, Auteur ; Peter Hodal, Auteur . - 2011 . - pp. 438-445.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 438-445
Mots-clés : Aircraft Bleed air Optimal control Ram air Temperature control Index. décimale : 629.1 Résumé : Conventional aircraft engine bleed air temperature regulation system is inefficient due to unnecessary ram air usage in cooling the bleed air, which in turn causes unnecessary drag and fuel consumption. This paper proposes an aircraft bleed air temperature control system, aiming at minimizing the ram air usage to reduce drag and fuel consumption while maintaining fast temperature control response. To achieve both of the objectives, a new control system configuration is developed to control both ram air and bypass flows in such a way that the bypass bleed air flow is automatically controlled at a small level that is just sufficient to maintain fast regulation of the flow temperature at the load. Analytical equations describing the system dynamics and linearized model are derived and utilized in the overall bleed air temperature control design and analysis. PI control and optimal output feedback are investigated. Computer simulations and experiments have been conducted, and the proposed control system is shown to be effective in reducing ram air usage and maintaining fast temperature control response in the meantime.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5175286
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 446-453
Titre : A Reduced-order nonlinear clutch pressure observer for automatic transmission Type de document : texte imprimé Auteurs : Bingzhao Gao, Auteur ; Chen, Hong, Auteur ; Haiyan Zhao, Auteur Année de publication : 2011 Article en page(s) : pp. 446-453 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Automatic transmission (AT) Clutch pressure estimation Input-to-state stability (ISS) Nonlinearity Reduced-order observer Index. décimale : 629.1 Résumé : For a novel type of automatic transmissions adopting clutch-to-clutch shift control technology with electro-hydraulic actuators, a clutch pressure observer method based on input-to-state stability (ISS) is proposed. Model uncertainties including steady state error and unmodelled dynamics are considered as additional disturbance inputs and the observer is designed in order that the error dynamics is input-to-state stable. Lookup tables, which are widely used to represent complex nonlinear characteristics of engine systems, appear in their original form in the designed reduced-order observer. The designed pressure observer is tested on an AMESim powertrain simulation model. Comparing with the sliding mode method, the designed pressure observer has the better performance.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5200347 [article] A Reduced-order nonlinear clutch pressure observer for automatic transmission [texte imprimé] / Bingzhao Gao, Auteur ; Chen, Hong, Auteur ; Haiyan Zhao, Auteur . - 2011 . - pp. 446-453.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 446-453
Mots-clés : Automatic transmission (AT) Clutch pressure estimation Input-to-state stability (ISS) Nonlinearity Reduced-order observer Index. décimale : 629.1 Résumé : For a novel type of automatic transmissions adopting clutch-to-clutch shift control technology with electro-hydraulic actuators, a clutch pressure observer method based on input-to-state stability (ISS) is proposed. Model uncertainties including steady state error and unmodelled dynamics are considered as additional disturbance inputs and the observer is designed in order that the error dynamics is input-to-state stable. Lookup tables, which are widely used to represent complex nonlinear characteristics of engine systems, appear in their original form in the designed reduced-order observer. The designed pressure observer is tested on an AMESim powertrain simulation model. Comparing with the sliding mode method, the designed pressure observer has the better performance.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5200347
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 454-462
Titre : An adaptive robust nonlinear motion controller combined with disturbance observer Type de document : texte imprimé Auteurs : Zi-Jiang Yang, Auteur ; Seiichiro Hara, Auteur ; Shunshoku Kanae, Auteur Année de publication : 2011 Article en page(s) : pp. 454-462 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Adaptive control Disturbance observer (DOB) Input-to-state stability Motion control Robust control Index. décimale : 629.1 Résumé : Parameter adaptation and disturbance observer (DOB) have been considered as two contrastively different approaches to handle uncertainties in motion control problems. The purpose of this brief is to merge both techniques into one control design with theoretically guaranteed performance. It is shown that the DOB compensates low-passed components of the lumped uncertainties without the necessity of parameterization, whereas the adaptive mechanism is only automatically activated in the cases where the fast-changing components of the uncertainties beyond the pass-band of the DOB can be parameterized by unknown parameters. It is thus shown theoretically how the DOB and adaptive mechanism play in a cooperative way so that the controller is more effective than the individual ones. Simulation results are provided to support the theoretical results.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5169843 [article] An adaptive robust nonlinear motion controller combined with disturbance observer [texte imprimé] / Zi-Jiang Yang, Auteur ; Seiichiro Hara, Auteur ; Shunshoku Kanae, Auteur . - 2011 . - pp. 454-462.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 454-462
Mots-clés : Adaptive control Disturbance observer (DOB) Input-to-state stability Motion control Robust control Index. décimale : 629.1 Résumé : Parameter adaptation and disturbance observer (DOB) have been considered as two contrastively different approaches to handle uncertainties in motion control problems. The purpose of this brief is to merge both techniques into one control design with theoretically guaranteed performance. It is shown that the DOB compensates low-passed components of the lumped uncertainties without the necessity of parameterization, whereas the adaptive mechanism is only automatically activated in the cases where the fast-changing components of the uncertainties beyond the pass-band of the DOB can be parameterized by unknown parameters. It is thus shown theoretically how the DOB and adaptive mechanism play in a cooperative way so that the controller is more effective than the individual ones. Simulation results are provided to support the theoretical results.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5169843
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 463-468
Titre : Nonlinear sampled-data stabilization of dynamically positioned ships Type de document : texte imprimé Auteurs : Hitoshi Katayama, Auteur Année de publication : 2011 Article en page(s) : pp. 463-468 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Control of ships Euler approximate model Nonlinear sampled data control Stabilization Index. décimale : 629.1 Résumé : In this brief, we consider the nonlinear sampled-data stabilization of dynamically positioned ships. Using the nonlinear sampled-data control theory developed by Nesic and the integrator backstepping technique for the Euler approximate model, we design semiglobally practically asymptotically (SPA) stabilizing controllers. We design both state feedback and output feedback controllers. We give a numerical example to illustrate the design methods.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4957022 [article] Nonlinear sampled-data stabilization of dynamically positioned ships [texte imprimé] / Hitoshi Katayama, Auteur . - 2011 . - pp. 463-468.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 463-468
Mots-clés : Control of ships Euler approximate model Nonlinear sampled data control Stabilization Index. décimale : 629.1 Résumé : In this brief, we consider the nonlinear sampled-data stabilization of dynamically positioned ships. Using the nonlinear sampled-data control theory developed by Nesic and the integrator backstepping technique for the Euler approximate model, we design semiglobally practically asymptotically (SPA) stabilizing controllers. We design both state feedback and output feedback controllers. We give a numerical example to illustrate the design methods.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4957022
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 469-473
Titre : Decentralized spacing control of a string of multiple vehicles over lossy datalinks Type de document : texte imprimé Auteurs : Rodney Teo, Auteur ; Dusan M. Stipanovic, Auteur ; Claire J. Tomlin, Auteur Année de publication : 2011 Article en page(s) : pp. 469-473 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Communication loss Decentralized control Leader-to-formation stability Multiple vehicles Spacing control String stability Wireless datalink Index. décimale : 629.1 Résumé : In spacing control of multiple vehicles as in aircraft, spacecraft formation flying and highway vehicle platooning, previous research has shown that the lead vehicle state is required by all following vehicles in order to achieve leader-to-formation stability. Following vehicles can estimate the lead vehicle's state during losses by assuming that the lead vehicle maintains its speed. In this paper, it is determined that, for bursty links, leader-to-formation stability can be retained if the lead vehicle indeed maintains its speed and if not, the spacing error will not exceed some bound which is some finite factor of the peak value of the lead vehicle's acceleration.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5299232 [article] Decentralized spacing control of a string of multiple vehicles over lossy datalinks [texte imprimé] / Rodney Teo, Auteur ; Dusan M. Stipanovic, Auteur ; Claire J. Tomlin, Auteur . - 2011 . - pp. 469-473.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 469-473
Mots-clés : Communication loss Decentralized control Leader-to-formation stability Multiple vehicles Spacing control String stability Wireless datalink Index. décimale : 629.1 Résumé : In spacing control of multiple vehicles as in aircraft, spacecraft formation flying and highway vehicle platooning, previous research has shown that the lead vehicle state is required by all following vehicles in order to achieve leader-to-formation stability. Following vehicles can estimate the lead vehicle's state during losses by assuming that the lead vehicle maintains its speed. In this paper, it is determined that, for bursty links, leader-to-formation stability can be retained if the lead vehicle indeed maintains its speed and if not, the spacing error will not exceed some bound which is some finite factor of the peak value of the lead vehicle's acceleration.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5299232
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 474-479
Titre : ODE-based modelling and calibration of temperatures in steelmaking ladles Type de document : texte imprimé Auteurs : Par Samuelsson, Auteur ; Bjorn Sohlberg, Auteur Année de publication : 2011 Article en page(s) : pp. 474-479 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Continuous casting Distributed parameter systems Grey-box modelling Steelmaking ladles Index. décimale : 629.1 Résumé : This brief considers modelling of steel and wall temperatures in steelmaking ladles used as liquid steel transportation vessels. Two measurement campaigns in order to collect data for model calibration and validation were conducted at the facilities of a Swedish stainless steel manufacturer. The process data were utilized in order to calibrate and validate an ordinary differential equation (ODE) model using a grey-box approach. The grey-box approach is justified since model structure and parameters are only partially known and few data are available for calibration. It is concluded that even though the model structure is non-complicated, the model shows promising accuracy for the steel temperature estimation. The model will be further evaluated in online simulations at the steel mill.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5109475 [article] ODE-based modelling and calibration of temperatures in steelmaking ladles [texte imprimé] / Par Samuelsson, Auteur ; Bjorn Sohlberg, Auteur . - 2011 . - pp. 474-479.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 474-479
Mots-clés : Continuous casting Distributed parameter systems Grey-box modelling Steelmaking ladles Index. décimale : 629.1 Résumé : This brief considers modelling of steel and wall temperatures in steelmaking ladles used as liquid steel transportation vessels. Two measurement campaigns in order to collect data for model calibration and validation were conducted at the facilities of a Swedish stainless steel manufacturer. The process data were utilized in order to calibrate and validate an ordinary differential equation (ODE) model using a grey-box approach. The grey-box approach is justified since model structure and parameters are only partially known and few data are available for calibration. It is concluded that even though the model structure is non-complicated, the model shows promising accuracy for the steel temperature estimation. The model will be further evaluated in online simulations at the steel mill.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5109475
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 480-490
Titre : Modeling and control of a partial body weight support system : an output regulation approach Type de document : texte imprimé Auteurs : Matthias Glauser, Auteur ; Zongli, Lin, Auteur ; Allaire, Paul E., Auteur Année de publication : 2011 Article en page(s) : pp. 480-490 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Disturbance rejection Output tracking Index. décimale : 629.1 Résumé : This brief reports on the modeling, control design, and implementation, and experimental results of a partial body weight support (PBWS) system, which facilitates walking and the relearning process for people suffering from gait impairment as a result of a neurological injury such as strokes. This apparatus is equipped with a load cell which constantly monitors the provided support force, and a linear motor, capable of taking immediate action to keep this support force very close to a predefined profile. In order to design a feedback control law that governs the action of the linear motor, a dynamic model of the PBWS system with a patient has been developed along with a procedure to identify the model parameters. Based on this model, the design of the feedback law is formulated and solved as an output regulation problem. The implementation of the resulting feedback law is described in detail and practical limitations of output regulation in this application are discussed. Preliminary data from a clinical study demonstrate the ability of this novel PBWS system to provide the desired support force patterns and to modulate gait parameters such as the vertical ground reaction force in a controlled manner.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152948 [article] Modeling and control of a partial body weight support system : an output regulation approach [texte imprimé] / Matthias Glauser, Auteur ; Zongli, Lin, Auteur ; Allaire, Paul E., Auteur . - 2011 . - pp. 480-490.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 480-490
Mots-clés : Disturbance rejection Output tracking Index. décimale : 629.1 Résumé : This brief reports on the modeling, control design, and implementation, and experimental results of a partial body weight support (PBWS) system, which facilitates walking and the relearning process for people suffering from gait impairment as a result of a neurological injury such as strokes. This apparatus is equipped with a load cell which constantly monitors the provided support force, and a linear motor, capable of taking immediate action to keep this support force very close to a predefined profile. In order to design a feedback control law that governs the action of the linear motor, a dynamic model of the PBWS system with a patient has been developed along with a procedure to identify the model parameters. Based on this model, the design of the feedback law is formulated and solved as an output regulation problem. The implementation of the resulting feedback law is described in detail and practical limitations of output regulation in this application are discussed. Preliminary data from a clinical study demonstrate the ability of this novel PBWS system to provide the desired support force patterns and to modulate gait parameters such as the vertical ground reaction force in a controlled manner.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5152948
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 491-500
Titre : Distributed interpolation schemes for field estimation by mobile sensor networks Type de document : texte imprimé Auteurs : Sonia Martinez, Auteur Année de publication : 2011 Article en page(s) : pp. 491-500 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Consensus filters Cooperative control Coverage problems Distributed estimation Mobile sensor networks Index. décimale : 629.1 Résumé : We introduce a procedure to adapt local interpolations to represent spatial fields as they are measured by a mobile sensor network. The scheme incorporates new sensor (synchronous) measurements in a similar fashion to a Kalman filter-like recursion. We derive necessary conditions that allow the distributed computation of the recursion and present an algorithm that makes use of agreement rules that satisfy them. We show how the nearest neighbor interpolation scheme is compatible with the motion coordination algorithm for region coverage proposed in. Finally, we illustrate the performance of the algorithms in simulation.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229132 [article] Distributed interpolation schemes for field estimation by mobile sensor networks [texte imprimé] / Sonia Martinez, Auteur . - 2011 . - pp. 491-500.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 491-500
Mots-clés : Consensus filters Cooperative control Coverage problems Distributed estimation Mobile sensor networks Index. décimale : 629.1 Résumé : We introduce a procedure to adapt local interpolations to represent spatial fields as they are measured by a mobile sensor network. The scheme incorporates new sensor (synchronous) measurements in a similar fashion to a Kalman filter-like recursion. We derive necessary conditions that allow the distributed computation of the recursion and present an algorithm that makes use of agreement rules that satisfy them. We show how the nearest neighbor interpolation scheme is compatible with the motion coordination algorithm for region coverage proposed in. Finally, we illustrate the performance of the algorithms in simulation.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229132
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 501-509
Titre : Drag-free control of the GOCE satellite : noise and observer design Type de document : texte imprimé Auteurs : Enrico Canuto, Auteur ; Andres Molano, Auteur ; Massotti, Luca, Auteur Année de publication : 2011 Article en page(s) : pp. 501-509 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Control Drag free Embedded model Noise Observer Satellite Index. décimale : 629.1 Résumé : This brief concerns model and noise design relevant to drag-free and attitude control of the European satellite gravity field and steady-state ocean circulation explorer (GOCE) under different control modes. As the model must include accurate dynamics of disturbance and measurement drifts to be rejected/estimated, noise design aims to select, and to mark with the Boolean variables of the control modes, the necessary and sufficient feedback channels (noise estimator) connecting model error to noise, which are the paths through which model state variables can be updated in real-time. Noise design is applied to a generic model encompassing position and attitude control, fed by position, rate, attitude, and acceleration sensors. The resulting closed-loop becomes a state predictor, providing controllable and disturbance states to drag-free and attitude control law, switching smoothly from mode to mode. Noise estimator gains are tuned to robust performance and stability by properly assigning closed-loop eigenvalues. Tuning details and simulated results illustrating the different modes are provided.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5169858 [article] Drag-free control of the GOCE satellite : noise and observer design [texte imprimé] / Enrico Canuto, Auteur ; Andres Molano, Auteur ; Massotti, Luca, Auteur . - 2011 . - pp. 501-509.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 501-509
Mots-clés : Control Drag free Embedded model Noise Observer Satellite Index. décimale : 629.1 Résumé : This brief concerns model and noise design relevant to drag-free and attitude control of the European satellite gravity field and steady-state ocean circulation explorer (GOCE) under different control modes. As the model must include accurate dynamics of disturbance and measurement drifts to be rejected/estimated, noise design aims to select, and to mark with the Boolean variables of the control modes, the necessary and sufficient feedback channels (noise estimator) connecting model error to noise, which are the paths through which model state variables can be updated in real-time. Noise design is applied to a generic model encompassing position and attitude control, fed by position, rate, attitude, and acceleration sensors. The resulting closed-loop becomes a state predictor, providing controllable and disturbance states to drag-free and attitude control law, switching smoothly from mode to mode. Noise estimator gains are tuned to robust performance and stability by properly assigning closed-loop eigenvalues. Tuning details and simulated results illustrating the different modes are provided.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5169858
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 510-515
Titre : Robust fault diagnosis based on nonlinear model of hydraulic gauge control system on rolling mill Type de document : texte imprimé Auteurs : Min Dong, Auteur ; Cai Liu, Auteur ; Guoyou Li, Auteur Année de publication : 2011 Article en page(s) : pp. 510-515 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Automatic gauge control (AGC) Decoupling Differentail geometric method Mathematical model Nonlinear observer Index. décimale : 629.1 Résumé : A nonlinear model of a hydraulic automatic gauge control (AGC) system is established for fault detection and isolation (FDI). By analyzing the relationship between faults and load uncertainties, a decoupling subsystem has been derived using a differential geometric approach. An exponential gain observer has been designed based on the observable decoupling subsystem. Diagnosis residual signal is sensitive to designated faults and robust to load uncertainty. Two real data examples verify that the observer is stable and asymptotically convergent. The correctness and superiority are testified by actual data examples.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5299099 [article] Robust fault diagnosis based on nonlinear model of hydraulic gauge control system on rolling mill [texte imprimé] / Min Dong, Auteur ; Cai Liu, Auteur ; Guoyou Li, Auteur . - 2011 . - pp. 510-515.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 510-515
Mots-clés : Automatic gauge control (AGC) Decoupling Differentail geometric method Mathematical model Nonlinear observer Index. décimale : 629.1 Résumé : A nonlinear model of a hydraulic automatic gauge control (AGC) system is established for fault detection and isolation (FDI). By analyzing the relationship between faults and load uncertainties, a decoupling subsystem has been derived using a differential geometric approach. An exponential gain observer has been designed based on the observable decoupling subsystem. Diagnosis residual signal is sensitive to designated faults and robust to load uncertainty. Two real data examples verify that the observer is stable and asymptotically convergent. The correctness and superiority are testified by actual data examples.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5299099
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 516-520
Titre : A Fractional order proportional and derivative (FOPD) motion controller : tuning rule and experiments Type de document : texte imprimé Auteurs : Hong Sheng Li, Auteur ; Ying Luo, Auteur ; Yang Quan Chen, Auteur Année de publication : 2011 Article en page(s) : pp. 516-520 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Fractional calculus Fractional order controller (FOC) Gain variations Iso-damping Second-order plant Index. décimale : 629.1 Résumé : In recent years, it is remarkable to see the increasing number of studies related to the theory and application of fractional order controller (FOC), specially PI ?? D ?? controller, in many areas of science and engineering. Research activities are focused on developing new analysis and design methods for fractional order controllers as an extension of classical control theory. In this paper, a new tuning method for fractional order proportional and derivative (PD ??) or FO-PD controller is proposed for a class of typical second-order plants. The tuned FO-PD controller can ensure that the given gain crossover frequency and phase margin are fulfilled, and furthermore, the phase derivative w. r. t. the frequency is zero, i.e., the phase Bode plot is flat at the given gain crossover frequency. Consequently, the closed-loop system is robust to gain variations. The FOC design method proposed in the paper is practical and simple to apply. Simulation and experimental results show that the closed-loop system can achieve favorable dynamic performance and robustness.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5153128 [article] A Fractional order proportional and derivative (FOPD) motion controller : tuning rule and experiments [texte imprimé] / Hong Sheng Li, Auteur ; Ying Luo, Auteur ; Yang Quan Chen, Auteur . - 2011 . - pp. 516-520.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 516-520
Mots-clés : Fractional calculus Fractional order controller (FOC) Gain variations Iso-damping Second-order plant Index. décimale : 629.1 Résumé : In recent years, it is remarkable to see the increasing number of studies related to the theory and application of fractional order controller (FOC), specially PI ?? D ?? controller, in many areas of science and engineering. Research activities are focused on developing new analysis and design methods for fractional order controllers as an extension of classical control theory. In this paper, a new tuning method for fractional order proportional and derivative (PD ??) or FO-PD controller is proposed for a class of typical second-order plants. The tuned FO-PD controller can ensure that the given gain crossover frequency and phase margin are fulfilled, and furthermore, the phase derivative w. r. t. the frequency is zero, i.e., the phase Bode plot is flat at the given gain crossover frequency. Consequently, the closed-loop system is robust to gain variations. The FOC design method proposed in the paper is practical and simple to apply. Simulation and experimental results show that the closed-loop system can achieve favorable dynamic performance and robustness.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5153128
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 521-530
Titre : System design and modeling of a time-varying, nonlinear temperature controller for microfluidics Type de document : texte imprimé Auteurs : Govind V. Kaigala, Auteur ; Jingbo Jiang, Auteur ; Christopher J. Backhouse, Auteur Année de publication : 2011 Article en page(s) : pp. 521-530 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Microchip genetic amplification Microfluidics System identification Thermal management Index. décimale : 629.1 Résumé : We present a custom-made temperature control system for performing sensitive biochemical reactions within a microfluidic platform. The thermoelectric module (TEM)-based system is part of a microfluidic platform for genetic basis of disease diagnosis. Multistage TEMs with individualized control are used to improve the response speeds compared to a single TEM. Currently, there exists neither a mathematical representation to predict the TEMs' response, nor any standardized approach to identify such systems-both of which will greatly assist in effectively controlling the temperature of the TEMs. Hence, we propose here an approach for system identification of these nonlinear elements in a cascade configuration. In this customized TEM configuration, a linear multiple-input-multi-output (MIMO) structure with temperature difference variables as the system outputs is chosen to derive the system model for subsequent controller design. For the application of temperature cycling between different set-points, a group of model-based controllers with switching strategy is designed, and for each set-point region, an internal model-based decentralized controller is implemented. Both simulation and experimental results demonstrate that the switching controller exhibits superior control performance for fast tracking (~ 6??C/s slew rate) and low steady state error (??0.1??C) when compared to a non-switching controller. The controller design approach can easily be extended to further multi-channel modules for wider applicability. Here, the integration of cost-effective and thermally-efficient physical temperature control elements with a switching and decentralized controller is applied to viral detection, which serves as the validation of the system identification-based controller.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5109473 [article] System design and modeling of a time-varying, nonlinear temperature controller for microfluidics [texte imprimé] / Govind V. Kaigala, Auteur ; Jingbo Jiang, Auteur ; Christopher J. Backhouse, Auteur . - 2011 . - pp. 521-530.
Génie Aérospatial
Langues : Anglais (eng)
in IEEE Transactions on control systems technology > Vol. 18 N° 2 (Mars 2010) . - pp. 521-530
Mots-clés : Microchip genetic amplification Microfluidics System identification Thermal management Index. décimale : 629.1 Résumé : We present a custom-made temperature control system for performing sensitive biochemical reactions within a microfluidic platform. The thermoelectric module (TEM)-based system is part of a microfluidic platform for genetic basis of disease diagnosis. Multistage TEMs with individualized control are used to improve the response speeds compared to a single TEM. Currently, there exists neither a mathematical representation to predict the TEMs' response, nor any standardized approach to identify such systems-both of which will greatly assist in effectively controlling the temperature of the TEMs. Hence, we propose here an approach for system identification of these nonlinear elements in a cascade configuration. In this customized TEM configuration, a linear multiple-input-multi-output (MIMO) structure with temperature difference variables as the system outputs is chosen to derive the system model for subsequent controller design. For the application of temperature cycling between different set-points, a group of model-based controllers with switching strategy is designed, and for each set-point region, an internal model-based decentralized controller is implemented. Both simulation and experimental results demonstrate that the switching controller exhibits superior control performance for fast tracking (~ 6??C/s slew rate) and low steady state error (??0.1??C) when compared to a non-switching controller. The controller design approach can easily be extended to further multi-channel modules for wider applicability. Here, the integration of cost-effective and thermally-efficient physical temperature control elements with a switching and decentralized controller is applied to viral detection, which serves as the validation of the system identification-based controller.
DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5109473
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