Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547838
H. Dahmani, M. Chadli, A. Rabhi, A. El Hajjaji
The lateral vehicle rollover represents a significant part of vehicle accidents. Driver assistance systems, previously only intended for yaw stabilization, are now being extended to incorporate rollover mitigation via braking. Preventing this kind of accident requires the knowledge of the rollover index which depends on the vehicle dynamic states and other parameters. In this paper we estimate vehicle dynamic states in presence of the road bank angle as disturbance in the vehicle model. Roll angle and roll rate are used to compute the rollover index which is based on the prediction of the lateral load transfer. The used nonlinear model deduced from the vehicle lateral and roll dynamics is represented by a Takagi-Sugeno (T-S) fuzzy model. The proposed observer is designed with unmeasurable premise variables. Stability conditions of such observers are given in terms of Linear Matrix Inequalities (LMI). The estimated states and computed rollover index are illustrated through simulation results.
{"title":"Fuzzy observer for detection of impending vehicle rollover with road bank angle considerations","authors":"H. Dahmani, M. Chadli, A. Rabhi, A. El Hajjaji","doi":"10.1109/MED.2010.5547838","DOIUrl":"https://doi.org/10.1109/MED.2010.5547838","url":null,"abstract":"The lateral vehicle rollover represents a significant part of vehicle accidents. Driver assistance systems, previously only intended for yaw stabilization, are now being extended to incorporate rollover mitigation via braking. Preventing this kind of accident requires the knowledge of the rollover index which depends on the vehicle dynamic states and other parameters. In this paper we estimate vehicle dynamic states in presence of the road bank angle as disturbance in the vehicle model. Roll angle and roll rate are used to compute the rollover index which is based on the prediction of the lateral load transfer. The used nonlinear model deduced from the vehicle lateral and roll dynamics is represented by a Takagi-Sugeno (T-S) fuzzy model. The proposed observer is designed with unmeasurable premise variables. Stability conditions of such observers are given in terms of Linear Matrix Inequalities (LMI). The estimated states and computed rollover index are illustrated through simulation results.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134508486","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}
Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547720
Mohammed Blej, M. Azizi
In this paper, we study the problem of accumulated tokens in a timed Petri net modeling our system and its interaction with the environment. This system consists of a robot, a programmable automaton and a computer. The execution of different tasks must be done with respect to some temporal constraints. So, we use the temporal Petri nets to model the whole system and also its verification. We describe the obtained Petri net and the constraints textually or graphically in the open source TINA environment. The studied problem is a consequence of a wrong functioning. We try two approaches to solve it: the first one is behavioral-like, it makes a review of tasks scheduling, it is based on the priorities granting to specific transitions in order to fire some transitions before others; while the second one is structural-like, and it introduces some changes to the net structure with respect of the specification of the system. The obtained results show that the problem of accumulated tokens in a Petri net is not deeply related to a scheduling problem, but it is a structural problem. These two approaches can be combined into a hybrid one. These testing results also serve for the re-design process of the system by reviewing the problem sources.
{"title":"Diagnosis of a congestion problem of tasks in a real-time system","authors":"Mohammed Blej, M. Azizi","doi":"10.1109/MED.2010.5547720","DOIUrl":"https://doi.org/10.1109/MED.2010.5547720","url":null,"abstract":"In this paper, we study the problem of accumulated tokens in a timed Petri net modeling our system and its interaction with the environment. This system consists of a robot, a programmable automaton and a computer. The execution of different tasks must be done with respect to some temporal constraints. So, we use the temporal Petri nets to model the whole system and also its verification. We describe the obtained Petri net and the constraints textually or graphically in the open source TINA environment. The studied problem is a consequence of a wrong functioning. We try two approaches to solve it: the first one is behavioral-like, it makes a review of tasks scheduling, it is based on the priorities granting to specific transitions in order to fire some transitions before others; while the second one is structural-like, and it introduces some changes to the net structure with respect of the specification of the system. The obtained results show that the problem of accumulated tokens in a Petri net is not deeply related to a scheduling problem, but it is a structural problem. These two approaches can be combined into a hybrid one. These testing results also serve for the re-design process of the system by reviewing the problem sources.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131418203","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}
Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547645
Mădălina Mircioiu, Elena M. Cimpoesu, C. Dimon
The main objective of this work is the design and implementation of control solutions for chemical and petrochemical processes, namely the control and optimization of the ethylene reactor, the key-installation in the petrochemical industry. We analyze in brief the theoretical knowledge of automatic control systems, the principal characteristics of this petrochemical process and we propose a robust control solution for the process plant. Finally, we try to offer an efficient optimization solution, considering that the process has a nonlinear multivariable structure. The results have been implemented on an assembly of pyrolysis reactors on the petrochemical platform from Pitesti, Romania.
{"title":"Robust control and optimization for a petrochemical pyrolysis reactor","authors":"Mădălina Mircioiu, Elena M. Cimpoesu, C. Dimon","doi":"10.1109/MED.2010.5547645","DOIUrl":"https://doi.org/10.1109/MED.2010.5547645","url":null,"abstract":"The main objective of this work is the design and implementation of control solutions for chemical and petrochemical processes, namely the control and optimization of the ethylene reactor, the key-installation in the petrochemical industry. We analyze in brief the theoretical knowledge of automatic control systems, the principal characteristics of this petrochemical process and we propose a robust control solution for the process plant. Finally, we try to offer an efficient optimization solution, considering that the process has a nonlinear multivariable structure. The results have been implemented on an assembly of pyrolysis reactors on the petrochemical platform from Pitesti, Romania.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115651340","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}
Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547715
A. Pietrabissa, F. Delli Priscoli
This paper defines a theoretical framework based on Markov Decision Processes (MDP) to deal with call control algorithms in links with variable capacity supporting multiple classes of service. The variable capacity problem, which arises in wireless network scenarios, is addressed by incorporating the link model into the MDP formulation and by introducing, beside the standard call admission policy, a call dropping policy. The proposed approach is capable of controlling class-level quality of service in terms of both blocking and dropping probabilities. The resulting MDP is scalable with respect to the number of link states in the link model.
{"title":"MDP call control in variable capacity communication networks","authors":"A. Pietrabissa, F. Delli Priscoli","doi":"10.1109/MED.2010.5547715","DOIUrl":"https://doi.org/10.1109/MED.2010.5547715","url":null,"abstract":"This paper defines a theoretical framework based on Markov Decision Processes (MDP) to deal with call control algorithms in links with variable capacity supporting multiple classes of service. The variable capacity problem, which arises in wireless network scenarios, is addressed by incorporating the link model into the MDP formulation and by introducing, beside the standard call admission policy, a call dropping policy. The proposed approach is capable of controlling class-level quality of service in terms of both blocking and dropping probabilities. The resulting MDP is scalable with respect to the number of link states in the link model.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114405884","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}
Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547676
K. Chabir, D. Sauter, I. Al-Salami, M. Abdelkrim
Networked Control Systems are becoming very popular nowadays. However, the use of networks in the control loop induces extra difficulties in diagnosis. In this paper we propose a method for estimate fault as well delay induced by the network. Inspired from the Kalman filter previously proposed by Sinopoli et al. and Hsieh et al., two solutions are presented; the augmented and the two-stage Kalman filter. Main attention is paid for the last one. The delay and the fault are integrated as a state variable. It is supposed that the delay and the fault are random variables. In addition, we provide some analytic results to demonstrate the computational advantages of two-stage Kalman filter over augmented ones. An example illustrates the obtained results is given.
{"title":"Two-stage Kalman filter for simultaneous fault and delay estimation in networked control systems","authors":"K. Chabir, D. Sauter, I. Al-Salami, M. Abdelkrim","doi":"10.1109/MED.2010.5547676","DOIUrl":"https://doi.org/10.1109/MED.2010.5547676","url":null,"abstract":"Networked Control Systems are becoming very popular nowadays. However, the use of networks in the control loop induces extra difficulties in diagnosis. In this paper we propose a method for estimate fault as well delay induced by the network. Inspired from the Kalman filter previously proposed by Sinopoli et al. and Hsieh et al., two solutions are presented; the augmented and the two-stage Kalman filter. Main attention is paid for the last one. The delay and the fault are integrated as a state variable. It is supposed that the delay and the fault are random variables. In addition, we provide some analytic results to demonstrate the computational advantages of two-stage Kalman filter over augmented ones. An example illustrates the obtained results is given.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114384600","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}
Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547651
Douglas W. Brown, Brian Bole, G. Vachtsevanos
This paper introduces a control architecture incorporating prognostic information to extend the Remaining Useful Life (RUL) of a system while ensuring stability and performance requirements. A Model Predictive Control (MPC) framework is chosen to utilize the existing production controller by adjusting its reference points, thereby lowering its impact on the system. The MPC arrives at a control law by minimizing a quadratic cost function of control effort and tracking error while enforcing hard and soft constraints. Prognostic information is included in the cost function through the use of soft constraints whereas absolute boundary conditions (eg. input limits, tracking error) are incorporated as hard constraints. A relationship is provided between the terminal cost associated with the prognostic constraints and the quadratic costs. Asymptotic stability of the control architecture is demonstrated for the case of nominal system dynamics. The proposed fault-tolerant control design is applicable to a variety of application domains. An EMA is used to illustrate the efficacy of the proposed approach.
{"title":"A prognostics enhanced reconfigurable control architecture","authors":"Douglas W. Brown, Brian Bole, G. Vachtsevanos","doi":"10.1109/MED.2010.5547651","DOIUrl":"https://doi.org/10.1109/MED.2010.5547651","url":null,"abstract":"This paper introduces a control architecture incorporating prognostic information to extend the Remaining Useful Life (RUL) of a system while ensuring stability and performance requirements. A Model Predictive Control (MPC) framework is chosen to utilize the existing production controller by adjusting its reference points, thereby lowering its impact on the system. The MPC arrives at a control law by minimizing a quadratic cost function of control effort and tracking error while enforcing hard and soft constraints. Prognostic information is included in the cost function through the use of soft constraints whereas absolute boundary conditions (eg. input limits, tracking error) are incorporated as hard constraints. A relationship is provided between the terminal cost associated with the prognostic constraints and the quadratic costs. Asymptotic stability of the control architecture is demonstrated for the case of nominal system dynamics. The proposed fault-tolerant control design is applicable to a variety of application domains. An EMA is used to illustrate the efficacy of the proposed approach.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114685127","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}
Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547797
G. Fusco, M. Russo
This paper deals with the problem of transient stability and voltage regulation in power systems control. When a large change of operating point occurs, caused for example by short-circuit fault, the parameters of the power system model vary. Their variations are unknown but limited to a given interval. A robust control technique based on the solution of a Riccati equation is adopted to design a state feedback excitation controller which guarantees both stability and voltage regulation objectives. The control objectives are achieved in spite of the presence of unknown bounded L1 disturbances in the power system model. To evaluate the performance achieved by the designed controller, a three-phase short-circuit fault near the generator terminal in a four-buses power system is simulated.
{"title":"Robust design of excitation controller for transient stability and voltage regulation in power systems","authors":"G. Fusco, M. Russo","doi":"10.1109/MED.2010.5547797","DOIUrl":"https://doi.org/10.1109/MED.2010.5547797","url":null,"abstract":"This paper deals with the problem of transient stability and voltage regulation in power systems control. When a large change of operating point occurs, caused for example by short-circuit fault, the parameters of the power system model vary. Their variations are unknown but limited to a given interval. A robust control technique based on the solution of a Riccati equation is adopted to design a state feedback excitation controller which guarantees both stability and voltage regulation objectives. The control objectives are achieved in spite of the presence of unknown bounded L1 disturbances in the power system model. To evaluate the performance achieved by the designed controller, a three-phase short-circuit fault near the generator terminal in a four-buses power system is simulated.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117185410","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}
Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547625
R. Trabelsi, Adel Kheder, M. Mimouni, F. M'sahli
This paper deals with the synthesis of a stabilizing Backstepping nonlinear control provided with an adaptive Backstepping observer to estimate the rotor flux of an Induction Machine (IM). This approach is based on the vector control strategy by replacing the existing conventional controller with a Backstepping control in order to more quickly bring back the q-axis flux towards zero and to reduce the effect of the motor parameters variations. To observe the rotor flux, we have introduced an observer based on the Backstepping theory provided with an adaptive mechanism of rotor resistance. The design principle of the controlled system is established using the Lyapunov stability theory.
{"title":"Backstepping control for an induction motor with an adaptive Backstepping rotor flux observer","authors":"R. Trabelsi, Adel Kheder, M. Mimouni, F. M'sahli","doi":"10.1109/MED.2010.5547625","DOIUrl":"https://doi.org/10.1109/MED.2010.5547625","url":null,"abstract":"This paper deals with the synthesis of a stabilizing Backstepping nonlinear control provided with an adaptive Backstepping observer to estimate the rotor flux of an Induction Machine (IM). This approach is based on the vector control strategy by replacing the existing conventional controller with a Backstepping control in order to more quickly bring back the q-axis flux towards zero and to reduce the effect of the motor parameters variations. To observe the rotor flux, we have introduced an observer based on the Backstepping theory provided with an adaptive mechanism of rotor resistance. The design principle of the controlled system is established using the Lyapunov stability theory.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117279654","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}
Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547754
M. Nachidi, A. El Hajjaji, J. Bosche
This article investigates the H∞ static output tracking control problem for nonlinear discrete-time systems. Based on a nonquadratic Lyapunov function, sufficient stability conditions, that guarantee a tracking error as small as possible, are given in terms of Linear Matrix Inequalities (LMIs). The main advantage of the proposed design, is that a reduced order fuzzy controller is derived in one-step without significant numerical burden. In order to show the applicability of the proposed scheme, an illustrative example which, deals with the output voltage regulation of a DC-DC buck converter, is investigated. Simulation results illustrate the design procedure and the obtained tracking performances of the proposed methodology.
{"title":"Output tracking control approach for DC-DC converters","authors":"M. Nachidi, A. El Hajjaji, J. Bosche","doi":"10.1109/MED.2010.5547754","DOIUrl":"https://doi.org/10.1109/MED.2010.5547754","url":null,"abstract":"This article investigates the H∞ static output tracking control problem for nonlinear discrete-time systems. Based on a nonquadratic Lyapunov function, sufficient stability conditions, that guarantee a tracking error as small as possible, are given in terms of Linear Matrix Inequalities (LMIs). The main advantage of the proposed design, is that a reduced order fuzzy controller is derived in one-step without significant numerical burden. In order to show the applicability of the proposed scheme, an illustrative example which, deals with the output voltage regulation of a DC-DC buck converter, is investigated. Simulation results illustrate the design procedure and the obtained tracking performances of the proposed methodology.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128965598","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}
Pub Date : 2010-06-23DOI: 10.1109/MED.2010.5547713
M. Ainan Kahyeh, N. Héraud, I. Souleiman Guelle, O. Bennouna
This paper addresses the fault detection and isolation issue of wind turbine systems. The underlying problem is very critical to enhance the reliability, the availability and reduce the cost of maintenance of wind turbines. In this work, we use a doubly fed induction generator and a nonlinear observer is utilized to generate the residual for fault detection purpose.
{"title":"Fault diagnosis of variable speed wind turbine","authors":"M. Ainan Kahyeh, N. Héraud, I. Souleiman Guelle, O. Bennouna","doi":"10.1109/MED.2010.5547713","DOIUrl":"https://doi.org/10.1109/MED.2010.5547713","url":null,"abstract":"This paper addresses the fault detection and isolation issue of wind turbine systems. The underlying problem is very critical to enhance the reliability, the availability and reduce the cost of maintenance of wind turbines. In this work, we use a doubly fed induction generator and a nonlinear observer is utilized to generate the residual for fault detection purpose.","PeriodicalId":149864,"journal":{"name":"18th Mediterranean Conference on Control and Automation, MED'10","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128805587","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}
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