{"title":"Directional change in LQ control with actuator failure","authors":"D. Horla","doi":"10.1109/MED.2012.6265686","DOIUrl":"https://doi.org/10.1109/MED.2012.6265686","url":null,"abstract":"A discrete-time LQ control with actuator failure is considered with directional change in controls phenomenon taken into account, as a result of actuator saturation case included. The control problem is analyzed in terms of algebraic Ricatti equations. Computer simulations of two-input two-output system are given to illustrate the performance of the reliable LQ controller with respect to directional change phenomenon.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126447512","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}
{"title":"Dynamical systems and control mindstorms","authors":"I. Markovsky","doi":"10.1109/MED.2012.6265614","DOIUrl":"https://doi.org/10.1109/MED.2012.6265614","url":null,"abstract":"An unorthodox programme for teaching systems and control is developed and tested at the School of Electronics and Computer Science of the University of Southampton. Motivation for the employed teaching methods is Moore's method and S. Papert's book “Mindstorms: children, computers, and powerful ideas”. The teaching is shifted from lecture instruction to independent work on computer based projects and physical models. Our experience shows that involvement with projects is more effective in stimulating curiosity in systems and control related concepts and in achieving understanding of these concepts. The programme consists of two parts: 1) analytical and computational exercises, using Matlab/Octave, and 2) laboratory exercises, using programmable Lego mindstorms models. Both activities cut across several disciplines - physics, mathematics, computer programming, as well as the subject of the programme - systems and control theory.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"42 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120818253","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}
{"title":"Nonlinear model predictive substrate feed control of biogas plants","authors":"D. Gaida, C. Wolf, T. Back, M. Bongards","doi":"10.1109/MED.2012.6265712","DOIUrl":"https://doi.org/10.1109/MED.2012.6265712","url":null,"abstract":"Optimal substrate feed control of biogas plants is a complex and challenging task due to the nonlinearity of the anaerobic digestion process, which produces biogas from biodegradable input material. In this paper a nonlinear model predictive control (NMPC) scheme is applied to optimally control the substrate feed of an agricultural biogas plant. The implemented algorithms are investigated in a simulation study using a validated simulation model of a full-scale biogas plant. Process states are estimated using a recently developed state estimator. Results show that this approach is very feasible providing the plant operator with a gain of 550 € per day compared to previous operation.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121109942","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}
{"title":"Particle filtering for the chemostat","authors":"B. Benyahia, F. Campillo, B. Cherki, J. Harmand","doi":"10.1109/MED.2012.6265665","DOIUrl":"https://doi.org/10.1109/MED.2012.6265665","url":null,"abstract":"We develop a particle filter approximation of the optimal nonlinear filter in the context of the chemostat. We propose a stochastic model of the chemostat together with an observation model. One of the characteristics of applications in bioprocesses is that the time between two observations is relatively large. We account for this point in the development of the particle filter by refining the prediction step of the particle filter. We present numerical tests on simulated measurements.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124892259","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}
{"title":"Practical dwell time approach for stability analysis of hybrid systems","authors":"E. Seroka, L. Socha","doi":"10.1109/MED.2012.6265737","DOIUrl":"https://doi.org/10.1109/MED.2012.6265737","url":null,"abstract":"The problem of the practical p-th mean stability of a class of stochastic nonlinear and time dependent linear hybrid systems with practically p-mean stable and unstable structures is considered. Sufficient conditions for the practical p-th mean stability under the stabilizing switching signal using Lyapunov techniques, the practical average dwell time and the practical dwell time approach, are derived. Three cases including the existence of the single Lyapunov function, the multiple Lyapunov function and the single practical Lyapunov-like function, for the practical p-th mean stability are discussed. The obtained results are illustrated by an example.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126060185","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}
{"title":"Nonlinear feedback control of a nutrient removal biological plant","authors":"H. El bahja, P. V. Vega Cruz, O. Bakka","doi":"10.1109/MED.2012.6265837","DOIUrl":"https://doi.org/10.1109/MED.2012.6265837","url":null,"abstract":"The aim of this work is to observe and control a biological nitrogen removal process. The paper illustrates the use of a linearized model in the design, an observer (software sensor) and a nonlinear feedback control technique based on a phenomenological model of the process. This model describes the complete dynamics of autotrophic and heterotrophic biomasses, biodegradable organic and nitrogenous matters. The control approach structure is combined with the estimation algorithm, for the on-line reconstruction of unmeasured biological states of the bioprocess. The efficiency of both the control and estimation are demonstrated via computer simulations.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126635969","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}
{"title":"Controllability and observability of linear dynamic systems revisited","authors":"K. Kienitz","doi":"10.1109/MED.2012.6265605","DOIUrl":"https://doi.org/10.1109/MED.2012.6265605","url":null,"abstract":"A modification of well-known controllability and observability tests using Lyapunov equations and Gramians yields a reliable tool for controllability and observability testing for linear continuous and discrete time systems, as well as an alternative procedure to determine controllable, observable and minimal system realizations.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116067932","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}
{"title":"A model predictive control approach to the load shifting problem in a household equipped with an energy storage unit","authors":"A. Giorgio, L. Pimpinella, F. Liberati","doi":"10.1109/MED.2012.6265850","DOIUrl":"https://doi.org/10.1109/MED.2012.6265850","url":null,"abstract":"This paper deals with the load shifting problem in a household equipped with smart appliances and an energy storage unit with conversion losses. The problem is faced by establishing an event driven Model Predictive Control framework aiming to meet the real life dynamics of a household and to keep low the impact of the control system on the total electric energy consumption. The proposed approach allows the consumer to minimize the daily energy cost in scenarios characterized by Time of Use tariffs and Demand Side Management, by dynamically evaluating the best time to run of the appliances and the optimal evolution of the battery level of charge. A proper set of realistic simulations validates the proposed approach, showing the relevance of the energy storage unit in the domestic load shifting architecture.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122911337","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}
O. Barambones, P. Alkorta, J. M. Gonzalez De Durana, E. Kremers
{"title":"A robust position control for induction motors using a load torque observer","authors":"O. Barambones, P. Alkorta, J. M. Gonzalez De Durana, E. Kremers","doi":"10.1109/MED.2012.6265651","DOIUrl":"https://doi.org/10.1109/MED.2012.6265651","url":null,"abstract":"The design of a robust position control scheme for an induction motor drive using the field oriented control theory is proposed. The proposed sliding-mode control law incorporates an adaptive sliding gain in order to adjust the sliding gain to the system uncertainties. Moreover, the sliding gain adaptation avoids having to calculate the upper limit for the system uncertainties. The design also incorporates a load torque observer in order to obtain the load torque applied to the induction motor without the use of the load torque sensor. The proposed observer is based on the system dynamical equation and uses the rotor speed and the stator current in order to obtain the load torque. The stability analysis of the proposed controller under parameter uncertainties and load torque variations is provided using the Lyapunov stability theory. Finally experimental results show that the proposed controller with the proposed observer provides high-performance dynamic characteristics and that this scheme is robust with respect to plant parameter uncertainties and load torque variations.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122022820","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}
{"title":"Robot navigation in simulated pedestrian areas based on swarm intelligence","authors":"J. Espelosín, L. Acosta, A. Hamilton","doi":"10.1109/MED.2012.6265628","DOIUrl":"https://doi.org/10.1109/MED.2012.6265628","url":null,"abstract":"In this paper we present a method that relies on swarm intelligence to confront the problem of navigating in non-structured dynamic environments. The collective behavior of a group of particles is used to find an obstacle-free path that is able to adapt its course as the structure of the environment changes. Of particular importance is the rule that governs collision avoidance in that it not only takes into account the positions of the obstacles, but also their velocities.","PeriodicalId":328772,"journal":{"name":"2012 20th Mediterranean Conference on Control & Automation (MED)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116616880","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}