Documents disponibles écrits par cet auteur

Adaptive vibration cancellation for tire-road friction coefficient estimation on winter maintenance vehicles / Gurkan Erdogan in IEEE Transactions on control systems technology, Vol. 18 N° 5 (Septembre 2010) 

Public ISBD [article]  in IEEE Transactions on control systems technology > Vol. 18 N° 5 (Septembre 2010) . - pp. 1023-1032 Titre : Adaptive vibration cancellation for tire-road friction coefficient estimation on winter maintenance vehicles Type de document : texte imprimé Auteurs : Gurkan Erdogan, Auteur ; Lee Alexander, Auteur ; Rajamani, Rajesh, Auteur Année de publication : 2011 Article en page(s) : pp. 1023-1032 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Adaptive  feedforward  Friction  coefficient  Vehicle  dynamics  Vibration  cancellation Index. décimale : 629.1 Résumé : This paper focuses on the development and experimental evaluation of a novel adaptive feedforward vibration cancellation based friction estimation system. The friction estimation utilizes a small instrumented redundant wheel on the vehicle. Unlike other systems previously documented in literature, the developed system can provide a continuous measurement of the friction coefficient under all vehicle maneuvers, even when the longitudinal and lateral accelerations are both zero. A key challenge in the development of the estimation system is the need to remove the influence of vibrations and the influence of vehicle maneuvers from the measured signal of a force sensor. An adaptive feedforward algorithm based on the use of accelerometer signals as reference inputs is developed. The parameters of the feedforward model estimated by the adaptive algorithm themselves serve to determine the value of the friction coefficient. At the same time, the influence of vibrations and of vehicle maneuvers is removed. Detailed experimental results are presented on a skid pad wherein the road surface changes from dry asphalt to ice. Results are presented at different speeds and with and without lateral and longitudinal maneuvers. Excellent performance is obtained in estimation of the friction coefficient. The performance of the adaptive feedforward algorithm is shown to be significantly superior to that of a simple cross-correlation based algorithm for friction estimation. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5286244 [article] Adaptive vibration cancellation for tire-road friction coefficient estimation on winter maintenance vehicles [texte imprimé] / Gurkan Erdogan, Auteur ; Lee Alexander, Auteur ; Rajamani, Rajesh, Auteur . - 2011 . - pp. 1023-1032. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 5 (Septembre 2010) . - pp. 1023-1032 Mots-clés : Adaptive  feedforward  Friction  coefficient  Vehicle  dynamics  Vibration  cancellation Index. décimale : 629.1 Résumé : This paper focuses on the development and experimental evaluation of a novel adaptive feedforward vibration cancellation based friction estimation system. The friction estimation utilizes a small instrumented redundant wheel on the vehicle. Unlike other systems previously documented in literature, the developed system can provide a continuous measurement of the friction coefficient under all vehicle maneuvers, even when the longitudinal and lateral accelerations are both zero. A key challenge in the development of the estimation system is the need to remove the influence of vibrations and the influence of vehicle maneuvers from the measured signal of a force sensor. An adaptive feedforward algorithm based on the use of accelerometer signals as reference inputs is developed. The parameters of the feedforward model estimated by the adaptive algorithm themselves serve to determine the value of the friction coefficient. At the same time, the influence of vibrations and of vehicle maneuvers is removed. Detailed experimental results are presented on a skid pad wherein the road surface changes from dry asphalt to ice. Results are presented at different speeds and with and without lateral and longitudinal maneuvers. Excellent performance is obtained in estimation of the friction coefficient. The performance of the adaptive feedforward algorithm is shown to be significantly superior to that of a simple cross-correlation based algorithm for friction estimation. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5286244

Development and experimental evaluation of a tilt stability control system for narrow commuter vehicles / Samuel Kidane in IEEE Transactions on control systems technology, Vol. 18 N° 6 (Novembre 2010) 

Public ISBD [article]  in IEEE Transactions on control systems technology > Vol. 18 N° 6 (Novembre 2010) . - pp. 1266-1279 Titre : Development and experimental evaluation of a tilt stability control system for narrow commuter vehicles Type de document : texte imprimé Auteurs : Samuel Kidane, Auteur ; Rajamani, Rajesh, Auteur ; Lee Alexander, Auteur Année de publication : 2011 Article en page(s) : pp. 1266-1279 Note générale : Génie Aérospatial Langues : Anglais (eng) Mots-clés : Narrow  vehicle  Roll  control  Roll  dynamics  Rollover  prevention  Tilt  control Index. décimale : 629.1 Résumé : This paper concentrates on development and experimental investigation of a compound control system designed for tilt stability of a narrow commuter vehicle. The control system is a combination of three different types of control schemes: Steering Tilt Control (STC) system, Direct Tilt Control (DTC) system and Tilt Brake system. These schemes utilize different types of actuators and offer complementary advantages over different ranges of operating speeds. The design of the control system is discussed. Then the combined STC-DTC system is first validated by running standard vehicle maneuver experiments such as turns and lane changes. The performance of the Tilt Brake algorithm is then verified for different low speed maneuvers. The feasibility of a stand alone DTC system is also experimentally investigated. Finally different experimental results are presented to demonstrate the effect of desired tilt angle definition on the handling of a narrow tilting vehicle. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5356230 [article] Development and experimental evaluation of a tilt stability control system for narrow commuter vehicles [texte imprimé] / Samuel Kidane, Auteur ; Rajamani, Rajesh, Auteur ; Lee Alexander, Auteur . - 2011 . - pp. 1266-1279. Génie Aérospatial Langues : Anglais (eng) in IEEE Transactions on control systems technology > Vol. 18 N° 6 (Novembre 2010) . - pp. 1266-1279 Mots-clés : Narrow  vehicle  Roll  control  Roll  dynamics  Rollover  prevention  Tilt  control Index. décimale : 629.1 Résumé : This paper concentrates on development and experimental investigation of a compound control system designed for tilt stability of a narrow commuter vehicle. The control system is a combination of three different types of control schemes: Steering Tilt Control (STC) system, Direct Tilt Control (DTC) system and Tilt Brake system. These schemes utilize different types of actuators and offer complementary advantages over different ranges of operating speeds. The design of the control system is discussed. Then the combined STC-DTC system is first validated by running standard vehicle maneuver experiments such as turns and lane changes. The performance of the Tilt Brake algorithm is then verified for different low speed maneuvers. The feasibility of a stand alone DTC system is also experimentally investigated. Finally different experimental results are presented to demonstrate the effect of desired tilt angle definition on the handling of a narrow tilting vehicle. DEWEY : 629.1 ISSN : 1063-6536 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5356230

Friction Estimation on Highway Vehicles Using Longitudinal Measurements / Wang, Junmin in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 126 N° 2 (Juin 2004)

Public ISBD [article]  in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 126 N° 2 (Juin 2004) . - 265-275 p. Titre : Friction Estimation on Highway Vehicles Using Longitudinal Measurements Titre original : Évaluation de Frottement sur des Véhicules de Route en Utilisant des Mesures Longitudinales Type de document : texte imprimé Auteurs : Wang, Junmin, Auteur ; Lee, Alexander, Auteur ; Rajamani, Rajesh Article en page(s) : 265-275 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Système  en  temps  réel  Frottement  Modèle  longitudinal  non-linéaire  Glissade Index. décimale : 629.8 Résumé : This paper develops a real-time tire-road friction coefficient measurement system that can reliably distinguish between different road surface friction levels and quickly detect abrupt changes in friction coefficient. The measurement system relies on the use of differential GPS and utilizes a nonlinear longitudinal tire force model. Compared to previously published results in literature, the advantage of the system developed in this paper is that it is applicable during both vehicle acceleration and braking and works reliably for a wide range of slip ratios, including high slip conditions. The system can be utilized on front/rear-wheel drive as well as all-wheel drive vehicles. Extensive results are presented from experimental results conducted on various surfaces with a winter maintenance vehicle called the "SAFEPLOW." The experimental results show that the system performs reliably and quickly in estimating friction coefficient on different road surfaces during various vehicle maneuvers. The developed friction measurement system has many applications in vehicle safety systems such as ABS, skid control and collision avoidance systems and is also useful for winter maintenance vehicles in which knowledge of the friction coefficient can be used to determine the amount and type of deicing chemicals to be applied to a winter roadway. Cet article développe un système en temps réel de mesure de coefficient de frottement de route de pneu qui peut sûrement distinguer différents niveaux de frottement de couche de surface et rapidement détecter les changements brusques du coefficient de frottement. Le système de mesure se fonde sur l'utilisation du différentiel GPS et utilise un modèle longitudinal non-linéaire de force de pneu. Comparé aux résultats précédemment édités en littérature, l'avantage du système développé en cet article est que cela est applicable pendant l'accélération de véhicule et freiner et fonctionne sûrement pour un éventail de rapports de glissade, y compris la glissade élevée conditionne. Le système peut être utilisé sur la commande de roue de front/rear comme tous les véhicules d'entraînement de roue. Des résultats étendus sont présentés des résultats expérimentaux conduits sur de diverses surfaces avec un véhicule d'entretien d'hiver appelé l'"SAFEPLOW." Les résultats expérimentaux prouvent que le système exécute sûrement et rapidement en estimant le coefficient de frottement sur différentes couches de surface pendant de diverses manoeuvres de véhicule. Le système développé de mesure de frottement a beaucoup d'applications dans des systèmes de sûreté de véhicule tels que des systèmes d'ABS, de commande de dérapage et d'action d'éviter de collision et est également utile pour les véhicules d'entretien d'hiver en lesquels la connaissance du coefficient de frottement peut être employée pour déterminer la quantité et le type de produits chimiques de dégivrage à appliquer à une chaussée d'hiver. [article] Friction Estimation on Highway Vehicles Using Longitudinal Measurements = Évaluation de Frottement sur des Véhicules de Route en Utilisant des Mesures Longitudinales [texte imprimé] / Wang, Junmin, Auteur ; Lee, Alexander, Auteur ; Rajamani, Rajesh . - 265-275 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 126 N° 2 (Juin 2004) . - 265-275 p. Mots-clés : Système  en  temps  réel  Frottement  Modèle  longitudinal  non-linéaire  Glissade Index. décimale : 629.8 Résumé : This paper develops a real-time tire-road friction coefficient measurement system that can reliably distinguish between different road surface friction levels and quickly detect abrupt changes in friction coefficient. The measurement system relies on the use of differential GPS and utilizes a nonlinear longitudinal tire force model. Compared to previously published results in literature, the advantage of the system developed in this paper is that it is applicable during both vehicle acceleration and braking and works reliably for a wide range of slip ratios, including high slip conditions. The system can be utilized on front/rear-wheel drive as well as all-wheel drive vehicles. Extensive results are presented from experimental results conducted on various surfaces with a winter maintenance vehicle called the "SAFEPLOW." The experimental results show that the system performs reliably and quickly in estimating friction coefficient on different road surfaces during various vehicle maneuvers. The developed friction measurement system has many applications in vehicle safety systems such as ABS, skid control and collision avoidance systems and is also useful for winter maintenance vehicles in which knowledge of the friction coefficient can be used to determine the amount and type of deicing chemicals to be applied to a winter roadway. Cet article développe un système en temps réel de mesure de coefficient de frottement de route de pneu qui peut sûrement distinguer différents niveaux de frottement de couche de surface et rapidement détecter les changements brusques du coefficient de frottement. Le système de mesure se fonde sur l'utilisation du différentiel GPS et utilise un modèle longitudinal non-linéaire de force de pneu. Comparé aux résultats précédemment édités en littérature, l'avantage du système développé en cet article est que cela est applicable pendant l'accélération de véhicule et freiner et fonctionne sûrement pour un éventail de rapports de glissade, y compris la glissade élevée conditionne. Le système peut être utilisé sur la commande de roue de front/rear comme tous les véhicules d'entraînement de roue. Des résultats étendus sont présentés des résultats expérimentaux conduits sur de diverses surfaces avec un véhicule d'entretien d'hiver appelé l'"SAFEPLOW." Les résultats expérimentaux prouvent que le système exécute sûrement et rapidement en estimant le coefficient de frottement sur différentes couches de surface pendant de diverses manoeuvres de véhicule. Le système développé de mesure de frottement a beaucoup d'applications dans des systèmes de sûreté de véhicule tels que des systèmes d'ABS, de commande de dérapage et d'action d'éviter de collision et est également utile pour les véhicules d'entretien d'hiver en lesquels la connaissance du coefficient de frottement peut être employée pour déterminer la quantité et le type de produits chimiques de dégivrage à appliquer à une chaussée d'hiver.

Ultra-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) 

Public ISBD [article]  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