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作者： Yang, Chunyu Zhang, Qingling Chou, Jyh-Horng Zhang, Yingwei Key Laboratory of Integrated Automation of Process Industry Ministry of Education Northeastern University Shenyang 110004 China Institute of Systems Science Northeastern University Shenyang 110004 China Institute of System Information and Control Engineering National Kaohsiung First University of Science and Technology I University Road Yuanchau Kaohsiung 824 Taiwan

ISBN: (纸本)9781424474264

This paper investigates the absolute stability problem for Lur'e singularly perturbed systems with multiple nonlinearities. The objective is to determine if the system is absolutely stable for any Ε ∈ (0, Ε0], where Ε denotes the perturbation parameter and Ε0 is a pre-defined positive scalar. Firstly, an Ε-dependent Lyapunov function of Lur'e-postnikov form is constructed. Then, a stability criterion expressed in terms of Ε-independent linear matrix inequalities (LMIs) is derived. Finally, an example is given to show the feasibility and effectiveness of the obtained method. © 2010 AACC.

关键词： Stability criteria

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Limited-memory-BFGS-based iterative algorithm for multispectral bioluminescence tomography with Huber regularization

Limited-memory-BFGS-based iterative algorithm for multispect...

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Medical Imaging 2010 - Biomedical Applications in Molecular, Structural, and Functional Imaging

作者： Feng, Jinchao Jia, Kebin Tian, Jie Qin, Chenghu Zhu, Shouping College of Electronic Information and Control Engineering Beijing University of Technology Beijing 100022 China Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences P. O. Box 2728 Beijing 100190 China Life Science Research Center Xidian University Xi'an 710071 China

ISBN: (纸本)9780819480279

Multispectral bioluminescence tomography is becoming a promising tool because it can resolve the biodistibution of bioluminescent reporters associated with cellular and subcellular function through several millimeters with to centimeters of tissues in vivo. Generally, to recover the bioluminescent sources, the source reconstruction problem is formulated as a nonlinear least-squares-type bounds constrained optimization problem. However, bioluminescence tomography (BLT) is an ill-posed problem. For the sake of stability and uniqueness of BLT, many algorithms have been proposed to regularize the problem, such as L2 norm and L1 norm. Here, we proposed a new regularization method with Huber function to regularize BLT problem to obtain robustness like L1 and rapid convergence of L 2. Furthermore, the computational burden is largely increased with the use of spectral data. Therefore, there is a critical need to develop a fast reconstruction algorithm for solving multispectral bioluminescence tomography. In the paper, a limited memory quasi-Newton algorithm for solving the large-scale optimization problem is proposed to fast localize the bioluminescent source. In the numerical simulation, a heterogeneous phantom was used to evaluate the performance of the proposed algorithm with the Monte Carlo based synthetic data. Additionally, the real mouse experiments were conducted to further evaluate the proposed algorithm. The results demonstrate the potential and merits of the proposed algorithm. © 2010 Copyright SPIE - The International Society for Optical Engineering.

关键词： Constrained optimization

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Robust ℋ221E;control of networked control systems with access constraints and packet dropouts

Robust ℋ221E;control of networked control systems with acce...

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International Conference on Green Circuits and systems (ICGCS)

作者： Dongxiao Wu Jun Wu Sheng Chen State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control University of Zhejiang Hangzhou China School of Electronics and Computer Science University of Southampton Southampton UK

We consider a class of networked control systems (NCSs) where the plant has time-varying norm-bounded parameter uncertainties, the network only provides a limited number of simultaneous accesses for the sensors and actuators, and the packet dropouts occur randomly in the network. For this class of NCSs with uncertainties and access constraints as well as packet dropouts, we derive sufficient conditions in the form of linear matrix inequalities that guarantee robust stochastic stabilisation and synthesis of ℋ ∞ controller. An example is provided to illustrate our proposed method.

关键词： Robustness Networked control systems Time varying systems Uncertain systems Sensor systems Actuators Uncertainty Sufficient conditions Linear matrix inequalities Robust control

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control for discrete-time singularly perturbed systems with distributional properties

Control for discrete-time singularly perturbed systems with ...

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作者： Wang, Guoliang Zhang, Qingling Bian, Chuanxin Sreeram, Victor Institute of Systems Science Liaoning Province 110004 China Key Laboratory of integrated Automation of Process industry Ministry of Education Northeastern University Shenyang Liaoning Province 110004 China Department of Electrical and Electrical Electronic and Computer Engineering University of Vestern Australia 35 Stirling Highway Crawley. WA Australia 6009 Australia

In this paper, the H∞ control problem for discrete-time singularly perturbed systems (DSPSs) with distributonal probabilities is considered. Compared with traditional DSPSs there are two main differences. The first is the singularly perturbation parameter in our model may be in different intervals instead of a deterministic interval. The second is the occurrence between two DSPSs is random. Via using a stochastic varahlr satisfying some probabilistic property with known probability distribution. for the first time DSPSs switching stochastically are modeled into a new type of DSPSs with stochastic parameter matrices. Mean-square eiponrntial stablity condition where the bound of Ε can he checked is prrsented via a new approach. Basrd on the derived criterion, however, an Ε-independent switching controller satisfying H∞ performance is given in terms of linear matrix inequalities (LMIs) with equality constraints. An effective algorithm involving LMIs is suggested to solve the matrix inequalities characterizing the controller solutions. Finally illustrative examples are presented to show the benefits and the validity of the proposed approaches. © 2010 ISSN.

关键词： Probability distributions

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Parameter identification of a Linear Permanent Magnet motor using Particle Swarm Optimization

Parameter identification of a Linear Permanent Magnet motor ...

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International Conference on Electrical Engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON

作者： Tithiwat Therdbankerd Peerayot Sanposh Nattapon Chayopitak Hideaki Fujita Intelligent Mechatronics Automation Robotics and Control Laboratory Department of Electrical Engineering Kasetsart University Bangkok Thailand Industrial Control and Automation Laboratory National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand Department of Electrical and Electronic Engineering Tokyo Institute of Technology Meguro Tokyo Japan

ISBN: (纸本)9781424456062;9789746724913

Accurate and effective parameter identification is an important engineering task in high performance control system design. One emerging approach to effectively identify such nonlinear or dynamic unknown parameters is to use Particle Swarm Optimization (PSO) algorithm. Linear Permanent Magnet (LPM) motor is a high performance actuator employed in many applications that require direct linear motion without mechanical transmission for high acceleration and accurate positioning. Therefore, accurate motor parameters are necessary to effectively control the LPM motors. This paper proposes a simple PSO based method with chirp inputs to identify the LPM motor's parameters. The simulations and experiments are conducted to verify the results and determine the effectiveness of the proposed method.

关键词： Parameter estimation Permanent magnet motors Particle swarm optimization Synchronous motors Signal processing Robotics and automation Chirp Intelligent robots control systems Laboratories

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A distributed control approach to robust output regulation of networked linear systems

A distributed control approach to robust output regulation o...

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International Conference on control and automation (ICCA)

作者： Xiaoli Wang Yiguang Hong Jie Huang Zhong-Ping Jiang Key Laboratory of Systems and Control Chinese Academy and Sciences Beijing China Mechanical and Automation Engineering Chinese University of Hong Kong Hong Kong China Electrical and Computer Engineering Polytechnic Institute of New York University Brooklyn NY USA

In this paper, the robust output regulation problem of a networked linear system with uncertainties is considered. Based on internal model, distributed control scheme is adopted to achieve the objectives of asymptotic tracking and disturbance rejection in a networked uncertain system where both the reference inputs and disturbances are generated by an exosystem. Both state and output feedback designs are given.

关键词： Distributed control Robust control Linear systems control systems Robustness Bismuth Uncertain systems Output feedback Feedback control Automatic control

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Dynamic modeling and model analysis of a large industrial synchronous generator

Dynamic modeling and model analysis of a large industrial sy...

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International Conference on Applied Electronics, AE

作者： Attila Fodor Attila Magyar Katalin M. Hangos Department of Electrical Engineering and Information Systems University of Pannonia Veszprem Hungary Process Control Research Group Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

A simple dynamic model of an industrial size synchronous generator operating in a nuclear power plant is developed in this paper based on first engineering principles. The constructed state-space model consists of a nonlinear state equation and a bi-linear output equation. It has been shown that the model is locally asymptotically stable with parameters obtained from the literature for a similar generator. The effect of load disturbances on the partially controlled generator has been analyzed by simulation using a traditional PI controller. It has been found that the controlled system is stable and can follow the set-point changes in the effective power well. The disturbance rejection of the controller is also satisfactory.

关键词： Mathematical model Equations Synchronous generators Torque Windings Rotors

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Reducing stick-slip motion in one-dimensional nano manipulation by real-time feedback control

Reducing stick-slip motion in one-dimensional nano manipulat...

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2010 10th IEEE Conference on Nanotechnology, NANO 2010

作者： Zhang, Jing Miao, Lei Wu, Re-Bing Xi, Ning Li, Chun-Wen Wang, Yue-Chao Tarn, Tzyh-Jong Department of Automation Tsinghua University Beijing 100084 China Center for Quantum Information Science and Technology Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Beijing 110016 China Department of Electrical and Computer Engineering Michigan State University East Lansing MI 48824 United States Department of Electrical and Systems Engineering Washington University St. Louis MO 63130 United States

ISBN: (纸本)9781424470334

When a micro cantilever with a nanoscale tip is manipulated on a substrate with atomic roughness, e.g., pushing an atomic-scale sample or etching the surface of the substrate to draw desired patterns, the periodical lateral frictional forces with stochastic fluctuations will induce stick-slip motion of the cantilever tip, which may greatly influence the precision of the nano manipulation. To reduce such a stick-slip motion, we propose a feedback control strategy based on the position estimation of the cantilever tip to compensate the periodical frictional force. Numerical simulations show that the motion of the cantilever tip under feedback control can track the desired trajectory asymptotically. Our proposal can aL be extended to the case when the cantilever tip moves over a Gaussian-shape defection on the substrate and when the stochastic fluctuations in the lateral force are with non-zero correlation time. ©2010 IEEE.

关键词： Feedback control

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Considering predicted road conditions in vehicle control design using H ∞ method

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IFAC Proceedings Volumes 2010年第7期43卷 396-401页

作者： Balázs Németh Peter Gáspár Department of Control and Transport Automation Budapest University of Technology and Economics Hungary Bertalan L. u. 3 H-1111 Budapest Hungary； Fax: +36-1-4633087； Phone: +36-1-4635574 Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1111 Budapest Hungary； Fax: +36-1-4667503； Phone: +36-1-2796171

The paper focuses on the design of a velocity control system which takes into consideration the knowledge of the predicted inclinations of the road along the track of the vehicle. By using this velocity control it is possible to reduce the operations of the actuators, i.e. the powertrain and the brake system. The longitudinal dynamics of the vehicle is formulated in a simplified control-oriented model, which contains the longitudinal control force and disturbances such as aerodynamic force, rolling resistance and road slope. If the inclination of the road surface is assumed to be known, it is considered in the calculation of the velocity tracking or the reference velocity. The design of the velocity tracking system is based on the H ∞ control theory. In order to take into consideration the effects of dynamic disturbances and sensor noises weighting functions of quality performances in the controlled system are designed. The operation of the method is demonstrated through simulation examples in Matlab/Simulink and CarSim environments.

关键词： vehicle dynamics velocity control robust control robust stability and performance automotive control

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Multi-targets tracking based on SB/MHT theory

Multi-targets tracking based on SB/MHT theory

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作者： Ru, Qi Peng, Zhihong Zhang, Juan Chen, Xun School of Automation Beijing Institute of Technology Beijing 100081 China Education Ministry Key Laboratory of Intelligent Control of Complex Systems and Decision Beijing 100081 China

ISBN: (纸本)9787894631046

Multi-targets video tracking theory is introduced briefly, and the structured Branching MHT algorithm is applied in Multi-targets video tracking system. Connected with Kalman filter, hypotheses are built by SB/MHT using measures which are stretched by Bhattacharyya coefficient. In this way, Multi-targets video tracking can carry out. Feasibility of this method is validated by simulation.

关键词： Kalman filters

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