The problem of designing a controller for a magnetic bearing is considered in this paper using H/sub /spl infin// optimisation. Classical criteria being unable to insure a satisfying closed loop behaviour, the input and the output of the flexible modes are used as supplementary degrees of freedom. Continuous-time and discrete-time syntheses are considered. The proposed approach allows to conveniently tune the closed-loop behaviour while satisfying severe constraints on the control capability.<>
{"title":"H/sub /spl infin// control of a magnetic bearing","authors":"S. Font, G. Duc, F. Carrere","doi":"10.1109/CCA.1994.381402","DOIUrl":"https://doi.org/10.1109/CCA.1994.381402","url":null,"abstract":"The problem of designing a controller for a magnetic bearing is considered in this paper using H/sub /spl infin// optimisation. Classical criteria being unable to insure a satisfying closed loop behaviour, the input and the output of the flexible modes are used as supplementary degrees of freedom. Continuous-time and discrete-time syntheses are considered. The proposed approach allows to conveniently tune the closed-loop behaviour while satisfying severe constraints on the control capability.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134323368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The coordinative adaptive control problem of two space robots holding a common object is investigated in this paper based on virtual decomposition. The original system is virtually decomposed into the object, the links, the bases, the reaction wheels, and the joints. Only the dynamic models of the rigid body and the joint are needed for control purpose. The degrees of freedom of the systems are partitioned into two categories: one is designed for position/orientation control and another is used to treat the driven force/moment constraints at the bases, a special problem about the space robots arisen from the motivation of fuel reservation. The proposed control algorithm is essentially a Newton-Euler type algorithm. The stability and the convergence of the original system are ensured based on Lyapunov analysis.<>
{"title":"Coordinative control of two space robots based on virtual decomposition","authors":"Wen-Hong Zhu, Y. Xi, Zhongjun Zhang","doi":"10.1109/CCA.1994.381446","DOIUrl":"https://doi.org/10.1109/CCA.1994.381446","url":null,"abstract":"The coordinative adaptive control problem of two space robots holding a common object is investigated in this paper based on virtual decomposition. The original system is virtually decomposed into the object, the links, the bases, the reaction wheels, and the joints. Only the dynamic models of the rigid body and the joint are needed for control purpose. The degrees of freedom of the systems are partitioned into two categories: one is designed for position/orientation control and another is used to treat the driven force/moment constraints at the bases, a special problem about the space robots arisen from the motivation of fuel reservation. The proposed control algorithm is essentially a Newton-Euler type algorithm. The stability and the convergence of the original system are ensured based on Lyapunov analysis.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133045518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Active variable-speed control of wind turbines requires good knowledge of the dynamics to be controlled. This is particularly important when combined with the increasingly common soft concept, resulting in structural eigenfrequencies within the closed-loop bandwidth. The purpose of the authors' work is to model the drive system in order to make possible the future design of an effective control system. In this paper, a physical model of the fundamental drive-system dynamics of a 400 kW horizontal axis variable-speed wind turbine is derived. The numerical parameter values in this model are then estimated from an identification experiment in closed loop on the real turbine using additional excitation (PRBS). Various identification schemes are compared and are shown to give consistent results in good agreement with the assumed physical model structure.<>
{"title":"Modeling and identification of drive-system dynamics in a variable-speed wind turbine","authors":"P. Novak, I. Jovik, B. Schmidtbauer","doi":"10.1109/CCA.1994.381193","DOIUrl":"https://doi.org/10.1109/CCA.1994.381193","url":null,"abstract":"Active variable-speed control of wind turbines requires good knowledge of the dynamics to be controlled. This is particularly important when combined with the increasingly common soft concept, resulting in structural eigenfrequencies within the closed-loop bandwidth. The purpose of the authors' work is to model the drive system in order to make possible the future design of an effective control system. In this paper, a physical model of the fundamental drive-system dynamics of a 400 kW horizontal axis variable-speed wind turbine is derived. The numerical parameter values in this model are then estimated from an identification experiment in closed loop on the real turbine using additional excitation (PRBS). Various identification schemes are compared and are shown to give consistent results in good agreement with the assumed physical model structure.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133357187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper deals with a new algorithm of a digital self-tuning PID controller. The controller parameters are derived on the basis of the pole placement approach. For parameter estimates of the proces model, the recursive least squares method (RLSM) with the LD decomposition and with directional forgetting is applied. The controller is designed especially for process control without overshoot of the process output; it will be used for temperature control of a thermo-analyzer.<>
{"title":"Self-tuning controller for temperature control of a thermo-analyzer","authors":"V. Bobál, M. Kubalcik","doi":"10.1109/CCA.1994.381312","DOIUrl":"https://doi.org/10.1109/CCA.1994.381312","url":null,"abstract":"The paper deals with a new algorithm of a digital self-tuning PID controller. The controller parameters are derived on the basis of the pole placement approach. For parameter estimates of the proces model, the recursive least squares method (RLSM) with the LD decomposition and with directional forgetting is applied. The controller is designed especially for process control without overshoot of the process output; it will be used for temperature control of a thermo-analyzer.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"310 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115864211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Classical control system design methods for linear systems cannot be directly applied to systems with delays, aftereffects or with any kind of hereditary properties. With respect to frequent occurrence of these phenomena in controlled plants a so-called anisochronic state model based on a functional modification of standard state space approach has been introduced to manage any kind of aftereffects in system dynamics. Using this model a new method of control parameter assignment is presented providing a prescribed oscillation damping (or characteristic equation roots) of the control process. The total differential of system characteristic functions and Lagrange multipliers are applied in the system synthesis. The design procedure is demonstrated on a heat transfer control.<>
{"title":"Control synthesis of systems with hereditary properties","authors":"P. Zítek","doi":"10.1109/CCA.1994.381347","DOIUrl":"https://doi.org/10.1109/CCA.1994.381347","url":null,"abstract":"Classical control system design methods for linear systems cannot be directly applied to systems with delays, aftereffects or with any kind of hereditary properties. With respect to frequent occurrence of these phenomena in controlled plants a so-called anisochronic state model based on a functional modification of standard state space approach has been introduced to manage any kind of aftereffects in system dynamics. Using this model a new method of control parameter assignment is presented providing a prescribed oscillation damping (or characteristic equation roots) of the control process. The total differential of system characteristic functions and Lagrange multipliers are applied in the system synthesis. The design procedure is demonstrated on a heat transfer control.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124588753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper considers the design of a decentralized adaptive controller for a water distribution system. This system consists of a 40-kilometer long canal connected to three secondary canals and four main reservoirs supplied by a 7 m/sup 3/ s/sup -1/ river (the Bourne river). More than 20 pumping stations are distributed along the canals, bringing water to the agricultural plain of Valence (South-East of France). The system is currently manually operated through flow control gates. The author's medium-term objective is to automatically operate this system and to improve water distribution efficiency and safety. In terms of control the primary goal is to satisfy the water demand at each pumping station, while guaranteeing a minimum water level, overflow avoidance and minimum wastes of water, in each section and reservoir of the system. The author's approach is divided into two main stages. An on-line identification procedure based both on a multi-input multi-output parametrized model and Kalman filtering. A state-space predictive control scheme using a Kalman state estimator defined on the basis of the on-line identified model. The author shows how this control scheme can be decentralized in case of large-scale water distribution systems, such as the author's process.<>
{"title":"Decentralized adaptive control for a water distribution system","authors":"Didier Georges","doi":"10.1109/CCA.1994.381318","DOIUrl":"https://doi.org/10.1109/CCA.1994.381318","url":null,"abstract":"This paper considers the design of a decentralized adaptive controller for a water distribution system. This system consists of a 40-kilometer long canal connected to three secondary canals and four main reservoirs supplied by a 7 m/sup 3/ s/sup -1/ river (the Bourne river). More than 20 pumping stations are distributed along the canals, bringing water to the agricultural plain of Valence (South-East of France). The system is currently manually operated through flow control gates. The author's medium-term objective is to automatically operate this system and to improve water distribution efficiency and safety. In terms of control the primary goal is to satisfy the water demand at each pumping station, while guaranteeing a minimum water level, overflow avoidance and minimum wastes of water, in each section and reservoir of the system. The author's approach is divided into two main stages. An on-line identification procedure based both on a multi-input multi-output parametrized model and Kalman filtering. A state-space predictive control scheme using a Kalman state estimator defined on the basis of the on-line identified model. The author shows how this control scheme can be decentralized in case of large-scale water distribution systems, such as the author's process.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129088408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Piecewise linear systems play an important role in nonlinear system modelling, but can be difficult to manage when it comes to analysing the system. This paper presents a compact, efficient algebraic description for a piecewise linear system and describes a method whereby a standard commercial graphical tool (SIMULINK) used for building and simulating systems can be exploited to generate the piecewise linear algebraic system description in a simple and quick manner.<>
{"title":"Representing piecewise linear systems for analysis and simulation","authors":"V. Besson, N. Pettit, P. Wellstead","doi":"10.1109/CCA.1994.381259","DOIUrl":"https://doi.org/10.1109/CCA.1994.381259","url":null,"abstract":"Piecewise linear systems play an important role in nonlinear system modelling, but can be difficult to manage when it comes to analysing the system. This paper presents a compact, efficient algebraic description for a piecewise linear system and describes a method whereby a standard commercial graphical tool (SIMULINK) used for building and simulating systems can be exploited to generate the piecewise linear algebraic system description in a simple and quick manner.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132935228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vibrational control is a nonclassical technique proposing the utilisation of zero mean parametric vibrations for shaping the response of a linear or nonlinear dynamic system. Several theoretical results on vibrational control are available in literature. In the case of nonlinear systems computational difficulties arise and theoretical results cannot easily be applied. A new averaging technique, based on the Taylor series expansion of the nonlinear system, is proposed in order to overcome such difficulties.<>
{"title":"Automatic averaging in the vibrational control of nonlinear systems","authors":"A. Balestrino, F. Bernini, A. Landi","doi":"10.1109/CCA.1994.381311","DOIUrl":"https://doi.org/10.1109/CCA.1994.381311","url":null,"abstract":"Vibrational control is a nonclassical technique proposing the utilisation of zero mean parametric vibrations for shaping the response of a linear or nonlinear dynamic system. Several theoretical results on vibrational control are available in literature. In the case of nonlinear systems computational difficulties arise and theoretical results cannot easily be applied. A new averaging technique, based on the Taylor series expansion of the nonlinear system, is proposed in order to overcome such difficulties.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"435 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116011492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The rich variety of control schemes involving neural networks, works which are proposed in the literature, is organised into a consistent perspective that isolate the various distinct features of each scheme and classifies them in a multi-level structure. The presented structure affords coherent and unambiguous analysis of past and new control schemes, reveals relevant links and gaps as by-products, and serves to better focus future research.<>
{"title":"A systematic classification of neural-network-based control","authors":"M. Agarwal","doi":"10.1109/CCA.1994.381234","DOIUrl":"https://doi.org/10.1109/CCA.1994.381234","url":null,"abstract":"The rich variety of control schemes involving neural networks, works which are proposed in the literature, is organised into a consistent perspective that isolate the various distinct features of each scheme and classifies them in a multi-level structure. The presented structure affords coherent and unambiguous analysis of past and new control schemes, reveals relevant links and gaps as by-products, and serves to better focus future research.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115426188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper presents applications of sensitivity functions to electrical systems supplied by static converters. We give an application to the synthesis of a digital control network of the output voltage of a variable frequency converter. We use the nonlinear model of the converter and thus the computation of optimal gains for a classical control structure is valid for large variations of the entry. Simulation results illustrates the good performances of this method.<>
{"title":"Optimization of control parameters by Newton's algorithm using sensitivity functions: application to the variable frequency DC-DC converter","authors":"D. Flieller, A. Oukaour, P. Henry, B. Le Pioufle","doi":"10.1109/CCA.1994.381432","DOIUrl":"https://doi.org/10.1109/CCA.1994.381432","url":null,"abstract":"The paper presents applications of sensitivity functions to electrical systems supplied by static converters. We give an application to the synthesis of a digital control network of the output voltage of a variable frequency converter. We use the nonlinear model of the converter and thus the computation of optimal gains for a classical control structure is valid for large variations of the entry. Simulation results illustrates the good performances of this method.<<ETX>>","PeriodicalId":173370,"journal":{"name":"1994 Proceedings of IEEE International Conference on Control and Applications","volume":"94 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115667094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：