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Ajouter le résultat dans votre panierDynamic modeling and design of a bulk-loaded liquid monopropellant powered rifle / Mark Adams in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 130 n°6 (Novembre 2008)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 8 p.
Titre : Dynamic modeling and design of a bulk-loaded liquid monopropellant powered rifle Type de document : texte imprimé Auteurs : Mark Adams, Auteur ; Barth, Eric J., Auteur Année de publication : 2009 Article en page(s) : 8 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : interior ballistics; liquid propellant powered rifle; dynamic model Résumé : This paper presents a dynamic model of the interior ballistics of an experimental liquid propellant powered rifle. The liquid propellant powered rifle described utilizes a mixture of hydroxyl ammonium nitrate and hydrocarbon fuel to replace gunpowder typically used in such firearms. The motivation for such a development is to discard the need for a shell casing whereby carrying only propellant and bullets will reduce both the mass and volume per shot carried by the soldier. A first-principles dynamic model of the interior ballistics is derived as a compressible fluid power problem with the chemical liberation of heat within the chamber modeled via a condensed-phase reaction rate law. The model is used to predict the overall performance in terms of ballistic kinetic energy as well as draw design insight regarding the role of friction, chamber geometry, and the profile of chamber pressure with respect to time. Simulation results are presented as well as preliminary experimental results from a proof-of-concept device. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Dynamic modeling and design of a bulk-loaded liquid monopropellant powered rifle [texte imprimé] / Mark Adams, Auteur ; Barth, Eric J., Auteur . - 2009 . - 8 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 8 p.
Mots-clés : interior ballistics; liquid propellant powered rifle; dynamic model Résumé : This paper presents a dynamic model of the interior ballistics of an experimental liquid propellant powered rifle. The liquid propellant powered rifle described utilizes a mixture of hydroxyl ammonium nitrate and hydrocarbon fuel to replace gunpowder typically used in such firearms. The motivation for such a development is to discard the need for a shell casing whereby carrying only propellant and bullets will reduce both the mass and volume per shot carried by the soldier. A first-principles dynamic model of the interior ballistics is derived as a compressible fluid power problem with the chemical liberation of heat within the chamber modeled via a condensed-phase reaction rate law. The model is used to predict the overall performance in terms of ballistic kinetic energy as well as draw design insight regarding the role of friction, chamber geometry, and the profile of chamber pressure with respect to time. Simulation results are presented as well as preliminary experimental results from a proof-of-concept device. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 10 p.
Titre : The controller output observer : estimation of vehicle tire cornering and normal forces Type de document : texte imprimé Auteurs : Basar Ozkan, Auteur ; Marco Pengov, Auteur ; Margolis, Donald, Auteur Année de publication : 2009 Article en page(s) : 10 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : controller output observer; physical system; vehicles Résumé : A controller output observer is used for estimating specific outputs from a physical system through the use of alternative outputs that are measured. In most cases these estimated signals can be measured directly using sensors. However, some outputs are either not possible to measure directly or alternative outputs are just easier to measure. This paper focused on a method to estimate immeasurable quantities, in near real time, through the use of physical models and measured quantities. This can be done through the use of classical observers as introduced by in 1964 (“ Observing the state of a Linear System,” IEEE Trans. Mil. Electron., 8, pp. 74–80) However, since observers estimate the system states, one would have to again estimate the sought after outputs by another method, such as a constitutive relationship. The method proposed here shows that certain signals can be estimated directly by using a controller but without using a constitutive law. These estimated quantities are inputs to a model of the real system. In other words, these inputs drive the observer model. A promising use for the controller output observer is estimation of tire forces in vehicles. This is because tires are very difficult to model accurately, and even if the tire is modeled accurately, the surface conditions of the road must be known to predict tire forces. The controller output observer does not require a model of the tires. The method is tested using a vehicle model. Real measurements from a vehicle are used to show that the method succeeds in estimating quantities from the real vehicle. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] The controller output observer : estimation of vehicle tire cornering and normal forces [texte imprimé] / Basar Ozkan, Auteur ; Marco Pengov, Auteur ; Margolis, Donald, Auteur . - 2009 . - 10 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 10 p.
Mots-clés : controller output observer; physical system; vehicles Résumé : A controller output observer is used for estimating specific outputs from a physical system through the use of alternative outputs that are measured. In most cases these estimated signals can be measured directly using sensors. However, some outputs are either not possible to measure directly or alternative outputs are just easier to measure. This paper focused on a method to estimate immeasurable quantities, in near real time, through the use of physical models and measured quantities. This can be done through the use of classical observers as introduced by in 1964 (“ Observing the state of a Linear System,” IEEE Trans. Mil. Electron., 8, pp. 74–80) However, since observers estimate the system states, one would have to again estimate the sought after outputs by another method, such as a constitutive relationship. The method proposed here shows that certain signals can be estimated directly by using a controller but without using a constitutive law. These estimated quantities are inputs to a model of the real system. In other words, these inputs drive the observer model. A promising use for the controller output observer is estimation of tire forces in vehicles. This is because tires are very difficult to model accurately, and even if the tire is modeled accurately, the surface conditions of the road must be known to predict tire forces. The controller output observer does not require a model of the tires. The method is tested using a vehicle model. Real measurements from a vehicle are used to show that the method succeeds in estimating quantities from the real vehicle. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 12 p.
Titre : Moving-boundary heat exchanger models with variable outlet phase Type de document : texte imprimé Auteurs : Brian D. Eldredge, Auteur ; Rasmussen, Bryan P., Auteur ; Alleyne, Andrew G., Auteur Année de publication : 2009 Article en page(s) : 12 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : condenser/receiver model; evaporator/accumulator model; moving-boundary framework Résumé : Vapor compression cycle systems using accumulators and receivers inherently operate at or near a transition point involving changes of phase at the heat exchanger outlets. This work introduces a condenser/receiver model and an evaporator/accumulator model developed in the moving-boundary framework. These models use a novel extension of physical variable definitions to account for variations in refrigerant exit phase. System-level model validation results, which demonstrate the validity of the new models, are presented. The model accuracy is improved by recognizing the sensitivity of the models to refrigerant mass flow rate. The approach developed and the validated models provide a valuable tool for dynamic analysis and control design for vapor compression cycle systems. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Moving-boundary heat exchanger models with variable outlet phase [texte imprimé] / Brian D. Eldredge, Auteur ; Rasmussen, Bryan P., Auteur ; Alleyne, Andrew G., Auteur . - 2009 . - 12 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 12 p.
Mots-clés : condenser/receiver model; evaporator/accumulator model; moving-boundary framework Résumé : Vapor compression cycle systems using accumulators and receivers inherently operate at or near a transition point involving changes of phase at the heat exchanger outlets. This work introduces a condenser/receiver model and an evaporator/accumulator model developed in the moving-boundary framework. These models use a novel extension of physical variable definitions to account for variations in refrigerant exit phase. System-level model validation results, which demonstrate the validity of the new models, are presented. The model accuracy is improved by recognizing the sensitivity of the models to refrigerant mass flow rate. The approach developed and the validated models provide a valuable tool for dynamic analysis and control design for vapor compression cycle systems. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 16 p.
Titre : A survey/review of frequency-weighted balanced model reduction techniques Type de document : texte imprimé Auteurs : Ghafoor, Abdul, Auteur ; Sreeram, Victor, Auteur Année de publication : 2009 Article en page(s) : 16 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : frequency-weighted balanced model reduction techniques; survey/review; Gramian based method Résumé : In this paper, a survey/review of frequency-weighted balanced model reduction techniques is presented. Several comments regarding their properties are given. A modified frequency interval Gramian based method is also presented. The computational issues are also discussed. The techniques are illustrated and compared using practical numerical examples. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] A survey/review of frequency-weighted balanced model reduction techniques [texte imprimé] / Ghafoor, Abdul, Auteur ; Sreeram, Victor, Auteur . - 2009 . - 16 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 16 p.
Mots-clés : frequency-weighted balanced model reduction techniques; survey/review; Gramian based method Résumé : In this paper, a survey/review of frequency-weighted balanced model reduction techniques is presented. Several comments regarding their properties are given. A modified frequency interval Gramian based method is also presented. The computational issues are also discussed. The techniques are illustrated and compared using practical numerical examples. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 12 p.
Titre : Application of CRONE control to a sampled time varying system with periodic coefficients Type de document : texte imprimé Auteurs : Sabatier, Jocelyn, Auteur ; Aitor Garcia Iturricha, Auteur ; Mathieu Moze, Auteur Année de publication : 2009 Article en page(s) : 12 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : CRONE robust control; discrete-time-varying systems; z-transforms; pseudofrequency responses Résumé : An application of CRONE robust control extended to discrete-time-varying systems with periodic coefficients is presented. The application is carried out in the frequency domain through the representation of considered systems using time varying z-transforms and time varying pseudofrequency responses. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Application of CRONE control to a sampled time varying system with periodic coefficients [texte imprimé] / Sabatier, Jocelyn, Auteur ; Aitor Garcia Iturricha, Auteur ; Mathieu Moze, Auteur . - 2009 . - 12 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 12 p.
Mots-clés : CRONE robust control; discrete-time-varying systems; z-transforms; pseudofrequency responses Résumé : An application of CRONE robust control extended to discrete-time-varying systems with periodic coefficients is presented. The application is carried out in the frequency domain through the representation of considered systems using time varying z-transforms and time varying pseudofrequency responses. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 8 p.
Titre : Experiments on fault-tolerant active vibration control Type de document : texte imprimé Auteurs : Tao Tao, Auteur ; Kenneth D. Frampton, Auteur ; Chakradhar Byreddy, Auteur Année de publication : 2009 Article en page(s) : 8 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : fault-tolerant active vibration control system; piezoceramic sensors; Beard–Jones filter Résumé : The purpose of this work is to experimentally demonstrate a fault-tolerant active vibration control system. Active vibration control is achieved using piezoceramic sensors and actuators (transducers) that are attached to a simply supported beam. These transducers are used by a set of optimal H2 feedback compensators to minimize the lateral vibration of a beam. Actuator faults are detected and isolated with a Beard–Jones fault detection filter. This filter is a special case of Luenberger observer, which produces a residual output with specific directional properties in response to a system fault. In this current research work, a new Beard–Jones filter design methodology is introduced that permits its use on high-order systems and also on systems with feed-through dynamics. The output of this detection filter is monitored by a hybrid automaton that determines when faults occur. This hybrid automaton then directs the selection of a feedback compensator specifically designed for the detected system fault state. The result is a vibration control system that is capable of maintaining optimal performance in the presence of system faults. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Experiments on fault-tolerant active vibration control [texte imprimé] / Tao Tao, Auteur ; Kenneth D. Frampton, Auteur ; Chakradhar Byreddy, Auteur . - 2009 . - 8 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 8 p.
Mots-clés : fault-tolerant active vibration control system; piezoceramic sensors; Beard–Jones filter Résumé : The purpose of this work is to experimentally demonstrate a fault-tolerant active vibration control system. Active vibration control is achieved using piezoceramic sensors and actuators (transducers) that are attached to a simply supported beam. These transducers are used by a set of optimal H2 feedback compensators to minimize the lateral vibration of a beam. Actuator faults are detected and isolated with a Beard–Jones fault detection filter. This filter is a special case of Luenberger observer, which produces a residual output with specific directional properties in response to a system fault. In this current research work, a new Beard–Jones filter design methodology is introduced that permits its use on high-order systems and also on systems with feed-through dynamics. The output of this detection filter is monitored by a hybrid automaton that determines when faults occur. This hybrid automaton then directs the selection of a feedback compensator specifically designed for the detected system fault state. The result is a vibration control system that is capable of maintaining optimal performance in the presence of system faults. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 11 p.
Titre : Time-multiplied guaranteed cost control of linear delay systems Type de document : texte imprimé Auteurs : Junling Wang, Auteur ; Lam, James, Auteur ; Shengyuan, Xu, Auteur Année de publication : 2009 Article en page(s) : 11 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : control equipment; delays; state feedback; design; closed loop systems Résumé : This paper investigates the design of guaranteed cost controllers for a class of linear systems with a state delay using a time-multiplied linear quadratic cost function. Based on delay-dependent and delay-independent stability criteria, guaranteed cost controllers can be constructed via solutions to linear matrix inequalities (LMIs) such that the resulting closed-loop system is stable and a specified time-multiplied linear integral-quadratic cost function has an upper bound. By the cone complementary linearization method, delay-dependent state feedback controllers can be derived in terms of LMIs. A numerical example is provided to demonstrate the effectiveness of the proposed method. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Time-multiplied guaranteed cost control of linear delay systems [texte imprimé] / Junling Wang, Auteur ; Lam, James, Auteur ; Shengyuan, Xu, Auteur . - 2009 . - 11 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 11 p.
Mots-clés : control equipment; delays; state feedback; design; closed loop systems Résumé : This paper investigates the design of guaranteed cost controllers for a class of linear systems with a state delay using a time-multiplied linear quadratic cost function. Based on delay-dependent and delay-independent stability criteria, guaranteed cost controllers can be constructed via solutions to linear matrix inequalities (LMIs) such that the resulting closed-loop system is stable and a specified time-multiplied linear integral-quadratic cost function has an upper bound. By the cone complementary linearization method, delay-dependent state feedback controllers can be derived in terms of LMIs. A numerical example is provided to demonstrate the effectiveness of the proposed method. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 13 p.
Titre : A review of proper modeling techniques Type de document : texte imprimé Auteurs : Tulga Ersal, Auteur ; D. Geoff Rideout, Auteur ; Loucas S. Louca, Auteur Année de publication : 2009 Article en page(s) : 13 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : algorithms; modeling; approximation; dynamics (mechanics); optimization; errors; dynamic systems Résumé : A dynamic system model is proper for a particular application if it achieves the accuracy required by the application with minimal complexity. Because model complexity often—but not always—correlates inversely with simulation speed, a proper model is often alternatively defined as one balancing accuracy and speed. Such balancing is crucial for applications requiring both model accuracy and speed, such as system optimization and hardware-in-the-loop simulation. Furthermore, the simplicity of proper models conduces to control system analysis and design, particularly given the ease with which lower-order controllers can be implemented compared to higher-order ones. The literature presents many algorithms for deducing proper models from simpler ones or reducing complex models until they become proper. This paper presents a broad survey of the proper modeling literature. To simplify the presentation, the algorithms are classified into frequency, projection, optimization, and energy based, based on the metrics they use for obtaining proper models. The basic mechanics, properties, advantages, and limitations of the methods are discussed, along with the relationships between different techniques, with the intention of helping the modeler to identify the most suitable proper modeling method for a given application. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] A review of proper modeling techniques [texte imprimé] / Tulga Ersal, Auteur ; D. Geoff Rideout, Auteur ; Loucas S. Louca, Auteur . - 2009 . - 13 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 13 p.
Mots-clés : algorithms; modeling; approximation; dynamics (mechanics); optimization; errors; dynamic systems Résumé : A dynamic system model is proper for a particular application if it achieves the accuracy required by the application with minimal complexity. Because model complexity often—but not always—correlates inversely with simulation speed, a proper model is often alternatively defined as one balancing accuracy and speed. Such balancing is crucial for applications requiring both model accuracy and speed, such as system optimization and hardware-in-the-loop simulation. Furthermore, the simplicity of proper models conduces to control system analysis and design, particularly given the ease with which lower-order controllers can be implemented compared to higher-order ones. The literature presents many algorithms for deducing proper models from simpler ones or reducing complex models until they become proper. This paper presents a broad survey of the proper modeling literature. To simplify the presentation, the algorithms are classified into frequency, projection, optimization, and energy based, based on the metrics they use for obtaining proper models. The basic mechanics, properties, advantages, and limitations of the methods are discussed, along with the relationships between different techniques, with the intention of helping the modeler to identify the most suitable proper modeling method for a given application. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 10 p.
Titre : Modeling of air-fuel ratio dynamics of gasoline combustion engine with ARX network Type de document : texte imprimé Auteurs : Tomáš Polóni, Auteur ; Tor Arne Johansen, Auteur ; Boris Rohal'-Ilkiv, Auteur Année de publication : 2009 Article en page(s) : 10 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : dynamics (mechanics); fuels; engines; modeling; networks; design; simulation; combustion Résumé : This article deals with nonlinear modeling of air-fuel ratio (AFR) dynamics of gasoline engines during transient operation. With a collection of input-output data measured near several operating points of the commercial engine, we have identified a global model of the system. The global model structure comes out of the modeling principles based on a weighting of local linear ARX model parameters in dependency on the operating point. It was found that the studied global model has the ability to approximate nonlinear effects and varying response time as well as varying time delay of air-fuel ratio dynamics. The advantage of the local linear approach is that it is flexible to fit experimental data and provides an appropriate structure for advanced nonlinear control algorithm synthesis. Moreover, the proposed nonlinear AFR model with identified numeric values of parameters listed in this article can be used for simulation purposes and also for testing of control algorithms. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Modeling of air-fuel ratio dynamics of gasoline combustion engine with ARX network [texte imprimé] / Tomáš Polóni, Auteur ; Tor Arne Johansen, Auteur ; Boris Rohal'-Ilkiv, Auteur . - 2009 . - 10 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 10 p.
Mots-clés : dynamics (mechanics); fuels; engines; modeling; networks; design; simulation; combustion Résumé : This article deals with nonlinear modeling of air-fuel ratio (AFR) dynamics of gasoline engines during transient operation. With a collection of input-output data measured near several operating points of the commercial engine, we have identified a global model of the system. The global model structure comes out of the modeling principles based on a weighting of local linear ARX model parameters in dependency on the operating point. It was found that the studied global model has the ability to approximate nonlinear effects and varying response time as well as varying time delay of air-fuel ratio dynamics. The advantage of the local linear approach is that it is flexible to fit experimental data and provides an appropriate structure for advanced nonlinear control algorithm synthesis. Moreover, the proposed nonlinear AFR model with identified numeric values of parameters listed in this article can be used for simulation purposes and also for testing of control algorithms. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 11 p.
Titre : Model predictive control of a direct fire projectile equipped with canards Type de document : texte imprimé Auteurs : Douglas Ollerenshaw, Auteur ; Costello, Mark, Auteur Année de publication : 2009 Article en page(s) : 11 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : trajectories (physics); projectiles; errors; predictive control; fire; flight Résumé : Launch uncertainties in uncontrolled direct fire projectiles can lead to significant impact point dispersion, even at relatively short range. A model predictive control scheme for direct fire projectiles is investigated to reduce impact point dispersion. The control law depends on projectile linear theory to create an approximate linear model of the projectile and quickly predict states into the future. Control inputs are based on minimization of the error between predicted projectile states and a desired trajectory leading to the target. Through simulation, the control law is shown to work well in reducing projectile impact point dispersion. Parametric trade studies on an example projectile configuration are reported that detail the effect of prediction horizon length, gain settings, model update interval, and model step size. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Model predictive control of a direct fire projectile equipped with canards [texte imprimé] / Douglas Ollerenshaw, Auteur ; Costello, Mark, Auteur . - 2009 . - 11 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 11 p.
Mots-clés : trajectories (physics); projectiles; errors; predictive control; fire; flight Résumé : Launch uncertainties in uncontrolled direct fire projectiles can lead to significant impact point dispersion, even at relatively short range. A model predictive control scheme for direct fire projectiles is investigated to reduce impact point dispersion. The control law depends on projectile linear theory to create an approximate linear model of the projectile and quickly predict states into the future. Control inputs are based on minimization of the error between predicted projectile states and a desired trajectory leading to the target. Through simulation, the control law is shown to work well in reducing projectile impact point dispersion. Parametric trade studies on an example projectile configuration are reported that detail the effect of prediction horizon length, gain settings, model update interval, and model step size. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 7 p.
Titre : Neural adaptive sliding mode control for a class of nonlinear neutral delay systems Type de document : texte imprimé Auteurs : Niu, Yugang, Auteur ; Lam, James, Auteur ; Wang, Xingyu, Auteur Année de publication : 2009 Article en page(s) : 7 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : sheet molding compound (plastics); sliding mode control; delays; particle filtering (numerical methods); surface mount components; artificial neural networks; closed loop systems; design; approximation; stability; scalars Résumé : This paper is concerned with the problem of sliding mode control (SMC) for a class of neutral delay systems with unknown nonlinear uncertainties that may not satisfy the norm-bounded condition. A SMC scheme based on neural-network approximation is proposed for the uncertain neutral delay system. By means of linear matrix inequality (LMI) approach, a sufficient condition is given such that the resultant closed-loop system is guaranteed to be stable, and the states asymptotically converge to zero. When the LMI is feasible, the designs of both the sliding surface and the sliding mode control law can be easily obtained via convex optimization. It is shown that the state trajectories are driven toward the specified sliding surface that depends on the current states as well as the delayed states. Finally, a simulation result is given to illustrate the effectiveness of the proposed method. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Neural adaptive sliding mode control for a class of nonlinear neutral delay systems [texte imprimé] / Niu, Yugang, Auteur ; Lam, James, Auteur ; Wang, Xingyu, Auteur . - 2009 . - 7 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 7 p.
Mots-clés : sheet molding compound (plastics); sliding mode control; delays; particle filtering (numerical methods); surface mount components; artificial neural networks; closed loop systems; design; approximation; stability; scalars Résumé : This paper is concerned with the problem of sliding mode control (SMC) for a class of neutral delay systems with unknown nonlinear uncertainties that may not satisfy the norm-bounded condition. A SMC scheme based on neural-network approximation is proposed for the uncertain neutral delay system. By means of linear matrix inequality (LMI) approach, a sufficient condition is given such that the resultant closed-loop system is guaranteed to be stable, and the states asymptotically converge to zero. When the LMI is feasible, the designs of both the sliding surface and the sliding mode control law can be easily obtained via convex optimization. It is shown that the state trajectories are driven toward the specified sliding surface that depends on the current states as well as the delayed states. Finally, a simulation result is given to illustrate the effectiveness of the proposed method. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 7 p.
Titre : Negative input shaping : eliminating overcurrenting and maximizing the command space Type de document : texte imprimé Auteurs : Khalid L. Sorensen, Auteur ; Keith Hekman, Auteur ; Aayush Daftari, Auteur Année de publication : 2009 Article en page(s) : 7 p. Note générale : dynamic systems Langues : Anglais (eng) Mots-clés : oscillations; cranes; simulation; gantry cranes; impulse (physics); equations; filters; signals; actuators Résumé : Input shaping is a filtering method used for reducing oscillation in flexible systems. A class of these filters, called negative input shapers, has been developed to improve system rise-time beyond what is achievable using conventional input-shaping filters. However, negative input shapers can cause overcurrenting and subsequent system oscillation, when used with certain reference commands. This class of reference commands is examined in the context of the command space. The command space represents the space of all possible signals that may be issued to a system. It provides insight into how overcurrenting occurs, how overcurrenting can be mitigated, and the influence that mitigation strategies have on system performance. Two overcurrenting mitigation strategies are presented. The operational effects of overcurrenting and overcurrenting mitigation are evaluated using a three-dimensional simulation of a bridge crane, and experimental results from a 10ton industrial bridge crane. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...] [article] Negative input shaping : eliminating overcurrenting and maximizing the command space [texte imprimé] / Khalid L. Sorensen, Auteur ; Keith Hekman, Auteur ; Aayush Daftari, Auteur . - 2009 . - 7 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 n°6 (Novembre 2008) . - 7 p.
Mots-clés : oscillations; cranes; simulation; gantry cranes; impulse (physics); equations; filters; signals; actuators Résumé : Input shaping is a filtering method used for reducing oscillation in flexible systems. A class of these filters, called negative input shapers, has been developed to improve system rise-time beyond what is achievable using conventional input-shaping filters. However, negative input shapers can cause overcurrenting and subsequent system oscillation, when used with certain reference commands. This class of reference commands is examined in the context of the command space. The command space represents the space of all possible signals that may be issued to a system. It provides insight into how overcurrenting occurs, how overcurrenting can be mitigated, and the influence that mitigation strategies have on system performance. Two overcurrenting mitigation strategies are presented. The operational effects of overcurrenting and overcurrenting mitigation are evaluated using a three-dimensional simulation of a bridge crane, and experimental results from a 10ton industrial bridge crane. En ligne : http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]
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