Robust control and filtering design for discrete-time linear systems with dynamics enhancement

Orientador: Pedro Luis Dias PeresTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de ComputaçãoResumo: Esta tese investiga os problemas de síntese de controladores robustos por realimentação estática de estados e de saída e de projeto de filtros robustos para sistemas incertos discretos lineares e invariantes no tempo por meio do enriquecimento da dinâmica do sistema. Considera-se que informações passadas estejam presentes nas leis de controle e, também, que a estrutura do filtro tenha dimensão superior à dimensão do sistema sendo filtrado. Extensões para abordar o problema de smoothing são igualmente propostas. O procedimento de síntese dos controladores e filtros é realizado construindo-se um sistema auxiliar aumentado, a partir do qual condições convexas para a síntese são derivadas, sendo essas descritas em termos de Desigualdades Matriciais Lineares dependentes de parâmetros. As normas H-2 e H-infinito são utilizadas como critérios de desempenho para as metodologias desenvolvidas. As condições propostas exploram a estrutura particular do sistema auxiliar aumentado, sendo distintas das condições clássicas da literatura para projeto de filtros robustos de ordem completa ou para o cômputo do ganho de realimentação de estado ou de saída para o sistema aumentado em função apenas do instante atual. Demonstra-se que os métodos propostos englobam outras técnicas disponíveis na literatura, não possuindo, portanto, maior grau de conservadorismo do que as abordagens existentes. Exemplos numéricos são apresentados para ilustrar as vantagens das condições desenvolvidas na determinação de menores limitantes para as normas H-2 e H-infinito, mostrando que o método tende a ser menos conservador conforme mais informações passadas são agregadas às leis de controle ou à medida que a ordem dos filtros aumenta. Outrossim, os exemplos numéricos evidenciam que os mesmos resultados não são obtidos pela simples aplicação de técnicas convencionais da literatura ao sistema auxiliar aumentadoAbstract: This thesis is concerned with the problems of robust static state and output feedback control synthesis and of robust filtering design for uncertain linear discrete time-invariant systems by means of dynamics enhancement. For that, the control laws are supposed to contain past information and the filter structure has a dimension greater than the dimension of the system being filtered. Extensions to cope with the smoothing problem are proposed as well. The procedure for the design of controllers and filters is performed by defining an auxiliary augmented system, from which convex synthesis conditions are derived, being described in terms of parameter-dependent Linear Matrix Inequalities. The H-2 and H-infinity norms are used as performance criteria for the developed methodology. The proposed conditions explore the particular structure of the auxiliary augmented system, thus being distinct from classical conditions from the literature for robust full-order filtering design, or for determining the state- or the output-feedback gains for the augmented system, in terms solely of the current instant. It is shown that the proposed methods encompass other techniques available in the literature, not incurring, therefore, in a greater degree of conservatism than the existing approaches. Numerical examples illustrate the advantages of the proposed conditions in determining lower upper-bounds for the H-2 and H-infinity norms, showing that the method tends to be less conservative as more past information is added to the control laws or as the order of the filters increases. Furthermore, the numerical examples evince that the same results are not attained by simply applying standard approaches from the literature to the auxiliary augmented systemDoutoradoAutomaçãoDoutor em Engenharia Elétrica2013/05957-1, 2014/23074-2FAPES

EOOLT 2007 – Proceedings of the 1st International Workshop on Equation-Based Object-Oriented Languages and Tools

Computer aided modeling and simulation of complex systems, using components from multiple application domains, such as electrical, mechanical, hydraulic, control, etc., have in recent years witness0065d a significant growth of interest. In the last decade, novel equation-based object-oriented (EOO) modeling languages, (e.g. Mode- lica, gPROMS, and VHDL-AMS) based on acausal modeling using equations have appeared. Using such languages, it has become possible to model complex systems covering multiple application domains at a high level of abstraction through reusable model components. The interest in EOO languages and tools is rapidly growing in the industry because of their increasing importance in modeling, simulation, and specification of complex systems. There exist several different EOO language communities today that grew out of different application areas (multi-body system dynamics, electronic circuit simula- tion, chemical process engineering). The members of these disparate communities rarely talk to each other in spite of the similarities of their modeling and simulation needs. The EOOLT workshop series aims at bringing these different communities together to discuss their common needs and goals as well as the algorithms and tools that best support them. Despite the short deadlines and the fact that this is a new not very established workshop series, there was a good response to the call-for-papers. Thirteen papers and one presentation were accepted to the workshop program. All papers were subject to reviews by the program committee, and are present in these electronic proceedings. The workshop program started with a welcome and introduction to the area of equa- tion-based object-oriented languages, followed by paper presentations and discussion sessions after presentations of each set of related papers. On behalf of the program committee, the Program Chairmen would like to thank all those who submitted papers to EOOLT'2007. Special thanks go to David Broman who created the web page and helped with organization of the workshop. Many thanks to the program committee for reviewing the papers. EOOLT'2007 was hosted by the Technical University of Berlin, in conjunction with the ECOOP'2007 conference

Wind Power

This book is the result of inspirations and contributions from many researchers of different fields. A wide verity of research results are merged together to make this book useful for students and researchers who will take contribution for further development of the existing technology. I hope you will enjoy the book, so that my effort to bringing it together for you will be successful. In my capacity, as the Editor of this book, I would like to thanks and appreciate the chapter authors, who ensured the quality of the material as well as submitting their best works. Most of the results presented in to the book have already been published on international journals and appreciated in many international conferences

Model based control for a modern automotive diesel engine

The dynamic performance of a turbocharged diesel engine during transient operation has been studied. For appropriate analysis of data obtained from engine transient operation, four alternative automated filtering methods were implemented on the cycle-by-cycle in-cylinder pressure. The techniques to process instantaneous emission data and align the transient data from different analyzers were developed. In the experimental study, the effects of engine speed and EGR have been investigated through load increase tests at a constant engine speed with different EGR calibrations. Based on the experimental results, a real-time diesel engine model was developed by Simulink. The model is capable of simulating the main engine parameters. It included the air path mode], combustion model and dynamic emission behavior model. The model can run as a real-time simulator for engine control strategy development. . An advanced fast predictive contro] approach was proposed and validated in a HIL simulation platform. The model predictive control was developed for EGR and VGT control. The oxygen concentration oriented control was designed and implemented in the real-time model. Compared with PID control, MPC presents a good tracking performance of reference values with a shorter response time. The results in HIL proved the real-time capability of the control strategy

Predictive control, a way to optimize energy use in buildings

211 p.The energy requirements of our globalized world carries out interdependence conditions and instability in certain areas. In developed societies, buildings expend about 40% of energy, and half it is used by the building climate systems to ensure thermal comfort. It must also be remarked that more than a half of the consumed power in Europa is imported. For these reasons, the reduction of the amount of power used in buildings has become an objective for the European power policy. This PhD Thesis studies two specific problems dealing them from a control perspective. The first problem is given by the big stock of aged poor quality residential blocks that are still in some districts of modern cities. The use of a Model Predictive Control (MPC) allows using the weather forecast to reduce the energy use ensuring thermal comfort. Results of the study show potential energy savings about 9 % when compared with the ones of a thermostatic control. The use of an MPC with a Time of Use (TOU) power rate shows also important economic benefits although there is no energy savings.The second problem that handles this PHD Thesis is to improve the blind system control of an office building in order to reduce the energy required need to maintain the comfort conditions in the offices. The analysis is checked with the two-office module found in the literature. This module is made of high quality materials, north-south oriented, and climatized by an MPC-controlled main TABS and auxiliary AHU systems. The novel enhanced blind system control uses the information of the required energy use foreseen by the MPC to regulate the blind system. Obtained results show a potential energy use reduction of 15 % in South oriented office when the novel system is compared with a hysteresis blind system control

Terza giornata di studio Ettore Funaioli: 16 luglio 2009

In questo volume sono raccolte le memorie presentate in occasione della “Terza giornata di studio Ettore Funaioli”, che si è tenuta il 16 luglio 2009 presso la Facoltà di Ingegneria dell’Alma Mater Studiorum – Università di Bologna. La giornata è stata organizzata dagli ex allievi del prof. Funaioli con la collaborazione del DIEM, Dipartimento di Ingegneria delle Costruzioni Meccaniche, Nucleari, Aeronautiche e di Metallurgia dell’Alma Mater Studiorum – Università di Bologna, con il patrocinio del GMA – Gruppo di Meccanica Applicata

Aeronautical engineering: A cumulative index to a continuing bibliography (supplement 235)

This publication is a cummulative index to the abstracts contained in Supplements 223 through 234 of Aeronautical Engineering: A Continuing Bibliography. The bibliographic series is compiled through the cooperative efforts of the American Institute of Aeronautics and Astronautics (AIAA) and the National Aeronautics and Space Administration (NASA). Seven indexes are included -- subject, personal author, corporate source, foreign technology, contract number, report number and accession number