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共 228 条记录，以下是141-150 订阅

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Stochastic H_2 Optimal control of Discrete-Time Markov Jump Systems with Periodic Coefficients

Stochastic H_2 Optimal Control of Discrete-Time Markov Jump ...

引用

American control Conference

作者： Hongji Ma Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781457710957

In this paper, the H_2 optimal state-feedback control problem is investigated for discrete-time Markov jump systems subject to periodic coefficients and multiplicative noise. First of all, an exhaustive analysis is pursued to set up an H_2 performance criterion (H_2 norm), which can be characterized by the periodic solutions of two generalized Lyapunov equations. Based on the obtained H_2 norm, the H_2 optimal state-feedback controller is designed in terms of the stabilizing solution of a discrete-time generalized Riccati equation with periodic coefficients. Moreover, this stabilizing solution can be computed efficiently by the available iterative algorithm.

关键词： Markov processes Noise Educational institutions Riccati equations Optimal control

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Lane Keeping control for Autonomous 4WS4WD Vehicles Subject to Wheel Slip Constraint

Lane Keeping Control for Autonomous 4WS4WD Vehicles Subject ...

引用

American control Conference

作者： Changfang Chen Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecom-munications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781457710957

This paper proposes a robust control scheme that prevents an autonomous 4WS4WD vehicle from lane departure and wheel skidding in presence of road curvature and aerodynamic drag. The control objectives can be specified as various closed-loop specifications, such as lane keeping, wheel slip constraint and disturbance attenuation. An LMI approach is used to deal with these objectives simultaneously, which combines the quadratic stabilization technique with constraints on inputs. Simulation results show that the proposed controller effectively limits the combined wheel slip and improves the lane keeping performance.

关键词： Wheels Vehicles Roads Tires Friction Aerodynamics Vehicle dynamics

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Towards an Ontology for Autonomous Robots

Towards an Ontology for Autonomous Robots

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2012 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Liam Paull Gaetan Severac Guilherme V. Raffo Julian Mauricio Angel Harold Boley Phillip J Durst Wendell Gray Maki Habib Bao Nguyen S. Veera Ragavan Sajad Saeedi G. Ricardo Sanz Mae Seto Aleksandar Stefanovski Michael Trentini Howard Li COBRA Department of Electrical and Computer Engineering University of New Brunswick Fredericton Canada ONERA - University of Toulouse France Department of Automation and Systems Federal University of Santa Catarina Brazil Department of Computer Engineering Pontificia Universidad Javeriana Bogot Colombia National Research Council Canada US Army ERDC Vicksburg Ms Mechanical Engineering Department School of Sciences and Engineering The American University in Cairo New Cairo Egypt Defence Research and Development Canada - CORA Ottawa ON Canada Monash University Sunway Campus Systems Engineering and Automatic Control Autonomous Systems Laboratory research group Universidad Politcnica de Madrid Madrid Spain Defence Research and Development Canada - Atlantic NS Canada Department of Computer Science The George Washington University Defence R&D Canada - Suffield Medicine Hat AB Canada

ISBN: (纸本)9781467317375

The IEEE RAS Ontologies for Robotics and automation Working Group is dedicated to developing a methodology for knowledge representation and reasoning in robotics and automation. As part of this working group, the Autonomous Robots sub-group is tasked with developing ontology modules for autonomous robots. This paper describes the work in progress on the development of ontologies for autonomous systems. For autonomous systems, the focus is on the cooperation, coordination, and communication of multiple unmanned aerial vehicles (UAVs), unmanned ground vehicles (UGVs), and autonomous underwater vehicles (AUVs). The ontologies serve as a framework for working out concepts of employment with multiple vehicles for a variety of operational scenarios with emphasis on collaborative and cooperative missions.

关键词： Ontologies Robot kinematics Sensors Planning Mobile robots Navigation

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Integrated Approach to Hypersonic Vehicle Modeling

Integrated Approach to Hypersonic Vehicle Modeling

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Chinese control Conference

作者： Xiaofeng Su Yingmin Jia Junping Du Fashan Yu The Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Key Laboratory of Mathematics Informatics and Behavioral Semantics (LMIB) Ministry of Education SMSS Beihang University (BUAA) Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications School of Electrical Engineering and Automation Henan Polytechnic University

ISBN: (纸本)9781467325813

This paper is devoted to the modeling problem of hypersonic vehicle with significant couplings. An integrated approach is developed to analytically model the dynamics of hypersonic vehicle, in which the effects of variable mass, spherical rotating earth, and couplings among the sub-models are considered. Furthermore, a preliminary analysis is conducted using the general data of a hypersonic vehicle. The simulation results show that the maximum of the Coriolis force can reach values up to 7.02% of the vehicle weight, and that the thermal load determined by the nonuniform aerodynamic heating and the properties of the structure has a significant influence on the elastic deformation.

关键词： Hypersonic vehicle modeling Inertial dynamics Aerodynamics Elasticity Heating hypersonic vehicles Aerodynamics elasticity Coriolis force Vehicle weight Heating Couplings Thermal loading elastic deformation

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Variable Speed Induction Generator Connected to AC Grid using AC-DC-AC Structures controlled by LQ Current Regulators with Integral Action

Variable Speed Induction Generator Connected to AC Grid usin...

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International Conference on Electrical Machines

作者： R. Rocha J.L. Silvino P. Resende Department of Control and Automation Engineering School of Mines Federal University of Ouro Preto Campus Morro do Cruzeiro 35400-000 Ouro Preto Minas Gerais Brazil Center of Research and Development in Electrical Engineering - CPDEE Federal University of Minas Gerais Campus Pampulha CXP:209 30161-970 Belo Horizonte Minas Gerais Brazil

ISBN: (纸本)9781467301435

This paper presents a discrete control system based on Linear Quadratic Regulator with integral action for variable speed generation system connected to AC grid using an AC-DCAC converter with VSI structure. The proposal consists basically in two LQ current regulators with integral action for the control of the flux of active and reactive power in the AC generator and AC line in order to obtain a good dynamic performance, a stable operation, robustness to disturbance and parameter variations, and the minimization of the power losses. An outer feedback loop with a PI controller and a feed-forward action realizes the voltage control in the DC bus. A little variable speed asynchronous generation system connected to AC grid using a AC-DC-AC converter with VSI structure is experimentally implemented in order to verify the response of the proposed control scheme, which presents a satisfactory dynamic performance.

关键词： control system indirect field orientation variable speed generator AC-DC-AC converter.

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Ensuring diversity in a backtrack and GA optimization method for delivery schedule

Ensuring diversity in a backtrack and GA optimization method...

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7th International Conference on Signal Image Technology and Internet-Based Systems, SITIS 2011

作者： Sakurai, Yoshitaka Takada, Kouhei Tsukamoto, Natsuki Onoyama, Takashi Knauf, Rainer Tsuruta, Setsuo School of Information Environment Tokyo Denki University Chiba Japan Research and Development Department Hitachi Software Engineering Co.Ltd. Tokyo Japan Faculty of Computer Science and Automation Ilmenau Univ. of Technology Ilmenau Germany

ISBN: (纸本)9780769546353

Delivery route optimization greatly improves the delivery efficiency in terms of all resources including human resources and energy consumption. In our application scenario the distribution network requires solving several tens to hundreds (max. 1500-2000) cities Traveling Salesman Problems (TSP) within interactive response time (around 3 seconds) with expert-level accuracy (below 3% level of error rate). Moreover, since domain experts have to adjust the solutions due to boundary conditions that can not be formally expressed (such as human convenience, road conditions, and social aspects), understandability and flexibility of the applied heuristics are necessary. To meet all these requirements, a Backtrack and Restart Genetic Algorithm (Br-GA) was proposed. This method combines Backtracking and GA having simple heuristics such as 2-opt and NI (Nearest Insertion) so that, in case of stagflation, GA can restarts with the state of populations going back to the state in the generation before stagflation. Here, a refinement of this algorithm is introduced, which aims at ensuring diversity of initial solutions, which are subject to mutation. We introduce a formal definition of a diversity degree as well as a technique to compose new random individuals, which follow a required degree of diversity. © 2011 IEEE.

关键词： Genetic algorithms

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Design and application of business oriented model based on meet-in-the-middle method

Design and application of business oriented model based on m...

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International Conference on Electronics, Communications and control (ICECC)

作者： Liusun Fu Shiwei Ma Chaozu Liang School of Mechatronic Engineering and Automation Shanghai Key Laboratory of Power Station Automation Technology Shanghai University Shanghai China Research and Development Department Shanghai Hongking Software Technology Company Limited Shanghai China

The BOA framework in which BOM is the basis has attracted much attention in developing ERP system of SMEs for solving the problem of information combination. In this paper, in order to provide VSP in BOA framework with large grain reusable module, to improve developing efficiency and reduce development and maintenance costs of ERP systems, a BOM based reconfigurable developing method is presented. According to the idea of BOA and convergent evolution, a design principle to develop BOM by using the approach of meet-in-the-middle formatting is proposed. A rapid VSP developing process by managing BOM and configuring BOM instances has also put forward. At the end of the paper, the feasibility of the reusable development method is illustrated with an application example.

关键词： Bills of materials Industries Marketing and sales XML Analytical models Libraries

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Online fine tuning of current PI controllers in spin-dry cycle of washing machines

Online fine tuning of current PI controllers in spin-dry cyc...

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International Aegean Conference on Electrical Machines and Power Electronics, ACEMP

作者： Sinem Karakas Metin Gokasan Washing Machine Plant Research and Development Department ARCELIK A.S. Tuzla Istanbul Turkey Control and Automation Engineering Istanbul Technical University Maslak Istanbul Turkey

A washing machine is a good example of a complex system. To meet market standards of the white goods industry the main driving motor of a washing machine must be chosen correctly and controlled effectively. High performance permanent magnet synchronous motors (PMSM) are now becoming the dominant electrical motor used in washing machines. In order to reach the desired efficiency level with PMSM type motors vector control scheme should be applied while cost and reliability requires no sensor to be used. This paper proposes an online method for tuning the proportional and integral terms of current controllers, which control the direct and quadrature axis currents in vector control of PMSM. The tuning is based on Nelder-Mead optimization algorithm and experimental results for spin-dry cycle are presented.

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Adaptive virtual machine provisioning in elastic multi-tier cloud platforms

Adaptive virtual machine provisioning in elastic multi-tier ...

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IEEE International Conference on Networking, Architecture and Storage

作者： Zhang, Fan Cao, Junwei Cai, Hong Mulcahy, James J. Wu, Cheng National CIMS Engineering and Research Center Department of Automation Tsinghua University Beijing 100084 China Research Institute of Information Technology Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China IBM China Software Development Lab. China Florida Atlantic University Boca Raton FL United States

ISBN: (纸本)9780769545097

Virtual machines are allocated on demand in virtualized cloud platforms to provide flexible and reliable services. The major difficulty lies in satisfying the conflicting objectives of reducing response time while lowering resource costs. In this paper, a mathematical multi-tier framework for virtual machine allocation is proposed, which can be used to capture the performance of the cloud platform. We first use simulations to derive virtual resource allocation policies, and later use real benchmarking applications to verify the effectiveness of this framework. Experimental results show that the model can be simply and effectively used to satisfy the response time requirement as well as lowering the cost of using the virtual machine resources. © 2011 IEEE.

关键词： Virtual machine

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Online process simulator with hybrid model of physical model and Just-In-Time model

Online process simulator with hybrid model of physical model...

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作者： Nakaya, Makoto Ikegaya, Yoshihiro Nakabayashi, Akio Ootani, Tetsuya Chen, Dong Li, Xinchun Wang, Dong Ogata, Marina Gravina Products Planning D and e Dept. IA Control Systems Development and Engineering Center Industrial Automation Business Headquarters Yokogawa Electric Corp. 2-9-32 Nakacho Musashino-shi Tokyo Japan Instrument and Control Research Center Corporate R and D Headquarters Yokogawa Electric Corp. 2-9-32 Nakacho Musashino-shi Tokyo Japan Research and Development Division Yokogawa Beijing Development Center 9F Jinbao Tower No. 89 Jinbao Street Doncheng District Beijing China Engineering Department Yokogawa South America Praca Acapulco 31-Santo Amaro Sao Paulo/SP Brazil

ISBN: (纸本)9783902661937

A tracking simulator that runs in parallel with the plant and perfectly simulates the plant behavior has been developed. This tracking simulator is currently in the validation phase at a commercial plant site. The tracking simulator strongly depends on the physical model based on physical and chemical laws, and it cannot simulate unknown phenomena in the plant. A hybrid model consisting of a physical model and a statistical model using the historical plant operation data was proposed. The estimation accuracy of the statistical model was improved using the virtual input from the tracking simulator. Although the Kalman filter technique is applied to conventional software sensors for quality estimation as a model updating function, deterioration of estimation accuracy is often seen with marked changes in plant behavior and the analyzers shut down. To resolve these issues, we applied Just-In-Time modeling based on the historical data modeling technique with the tracking simulator, and the plant model coverage of the tracking simulator was expanded for various processes. © 2011 IFAC.

关键词： Simulators

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