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Disturbance Rejection and Set-point Following of Periodic Signals Using Predictive control with Constraints

IFAC Proceedings Volumes 2008年第2期41卷 10892-10897页

作者： Liuping Wang Peter J Gawthrop Discipline of Electrical Energy and Control Systems School of Electrical and Computer Engineering RMIT University Melbourne Victoria 3000 Australia Centre for Systems and Control and Department of Mechanical Engineering University of Glasgow GLASGOW. G12 8QQ Scotland

This paper proposes a continuous-time model predictive control design for disturbance rejection and set-point following of periodic signals. By assuming input disturbance in the form of sinusoid, the periodic frequency is embedded into the design model. Hence, from internal model principle, the steady-state error of the model predictive control system is ensured to be zero for both disturbance rejection and set-point following. Furthermore, with the design framework of model predictive control, hard constraints on the derivative and amplitude of the control signals are imposed as part of the performance specification. Simulation studies have been used to show the efficacy of the design with or without hard constraints.

关键词： Periodic set-point signal periodic disturbance predictive control constrained control optimization

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Nonlinear sliding surfaces;Computing and existence of solution

Nonlinear sliding surfaces;Computing and existence of soluti...

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International Conference on control, Automation and Systems ( ICCAS)

作者： Azad Ghaffari Mohammad Javad Yazdanpanah Department of Instrumentation and Control Monenco Iran Tehran Iran Department of Electrical and Computer Engineering University of Tehran Tehran Iran

In this paper, we have concentrated on real systems consisting of structural uncertainties and affected by external disturbances. In this regard, Sliding Mode control (S.M.C.) is utilized. To decrease energy consumption, arising from chattering phenomenon, a smooth switch has been used in design procedure. Consequently, sliding equation will play a dominant controlling role in its neighborhood. The converging property of sliding motion towards the origin is a challenging issue. In this article we present a new method to prove the stability of the sliding phase which means, state trajectories on the sliding surface move toward the origin. At the beginning, the equivalent control method is reestablished such that makes this purpose accessible. The modification bounds the sliding equation to a converging set. Then to improve main factors of closed loop system, such as, transient behavior, energy consumption and the domain of attraction, the optimal control theory is used to compute the optimized sliding surface in the stabilizing set. Generally, desired surface has nonlinear terms. Finally, we propose an elaborate algorithm for computing optimized nonlinear surfaces. The designed controller is applied to a flexible-link setup. Simulation results show the efficiency of the proposed approach.

关键词： Sliding mode control Switches Equations control systems Optimal control Energy consumption Automatic control Nonlinear control systems Uncertainty Stability

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A Novel Dual Power Flow Wind Power Generation System

A Novel Dual Power Flow Wind Power Generation System

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11th International Conference on electrical Machines and Systems(第11届国际电机与系统会议)

作者： Ming Cheng Xikai Sun Longya Xu Wei Hua Engineering Research Center for Motion Control of MOE School of Electrical EngineeringSoutheast Un Department of Electrical & Computer Engineering The Ohio State University Columbus 43210 USA Engineering Research Center for Motion Control of MOE School of Electrical Engineering Southeast U

A novel dual power flow wind power generation system based on electrical variable transmission (EVT) is proposed which combines the advantages of direct-driven and non-direct-driven systems. In this paper, the principles of the dual power flow wind power generation system are presented. The dynamic model and operation modes of the double layer permanent magnet outer rotor based EVT are introduced. Furthermore, the operation processes and control strategies of the novel system are simulated and analyzed. An EVT prototype machine is designed and verified by finite element analysis (FEA).

关键词： Load flow Wind power generation Magnetic analysis Power system modeling Permanent magnets Rotors Process control Analytical models Prototypes Finite element methods

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A distributed dynamic model of mobile sensor network

A distributed dynamic model of mobile sensor network

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Long Zhao Li Peng Jindong Tang College of Communication and Control Engineering Jiangnan University Wuxi China Department of Electrical and Computer Engineering Michigan Technological University MI

Based on the located information and graph theory, a distributed sensor network model is introduced. The relationship between data transmission and fusion between nodes are described with Delaunay triangulation. And Voronoi diagrams have been used in the description of coverage region of nodes. With the model, disadvantages of existing located system based on a fixed infrastructure could be overcome.

关键词： Robot sensing systems Robots Robot kinematics Mobile communication Mobile computing Vehicles Wireless sensor networks

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Adaptive Digital Video Transmission in MIMO Systems

Adaptive Digital Video Transmission in MIMO Systems

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International Symposium on Intelligent Information Technology Application, IITA

作者： Jia-Chyi Wu Chi-Min Li Kuo-Hsean Chen Department of Communications Navigation and Control Engineering College of Electrical Engineering and Computer Science National Taiwan Ocean University Keelung Taiwan

Under limited channel capacity condition, this study investigates a combined source and channel coding algorithm providing a uniform video transmission rate to achieve better system performance in wireless MIMO systems. In the proposed algorithm, we applied MPEG2 video source coding scheme with convolutional channel coding as well as space-time block coding techniques, associated with BPSK/QPSK modulation method, to improve video transmission performance. The proposed algorithm assigned rates to MPEG2 source code and convolutional channel code, combined with space-time block coding schemes based upon the feedback information from performance control unit (PCU) under channel capacity limitation, which ensures the given system can achieve better performance compared to a conventional system.

关键词： MIMO Channel capacity Channel coding Convolutional codes Block codes System performance Source coding Binary phase shift keying Quadrature phase shift keying Modulation coding

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Stabilization of oscillators with bounded delayed input: Sliding mode control method

Stabilization of oscillators with bounded delayed input: Sli...

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International Symposium on Systems and control in Aerospace and Astronautics (ISSCAA)

作者： Xiangjun Li Xinghuo Yu Changhong Wang Department of Control Science and Engineering Harbin Institute of Technology China School of Electrical and Computer Engineering RMIT University Melbourne Australia

Oscillators with bounded delayed input are stabilized by a sliding mode control law. In the control law, sign function is replaced by high gain function to avoid chattering in the presence of time delay. A condition i... 详细信息

关键词： Oscillators Sliding mode control Delay effects Stability Force control Biological system modeling control system synthesis Analytical models Biological systems Humans

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COMMUNICATIONS FOR UNDERWATER ROBOTICS RESEARCH PLATFORMS

COMMUNICATIONS FOR UNDERWATER ROBOTICS RESEARCH PLATFORMS

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2nd Annual IEEE Internatioal Systems Conference

作者： Kranthimanoj Nagothu Matthew Joordens Mo Jamshidi Autonomous Control Engineering Center Department of Electrical and Computer Engineering University of Texas San Antonio San Antonio TX USA

This paper presents a distributed protocol for communication among autonomous underwater vehicles. It is a complementary approach for coordination between the autonomous underwater vehicles. This paper mainly describes different methods for underwater communication. One of the methods is brute force approach in which messages are broadcasted to all the communication nodes, which in turn will broadcast the acknowledgement. Issues relating to this brute force approach are time delay, number of hops, power consumption, message collision and other practical issues. These issues are discussed and solved by proposing a new method to improve efficiency of this proposed approach and its effectiveness in communication among autonomous underwater vehicles.

关键词： Underwater communication Underwater vehicles Oceans Modems Acoustic propagation Optical fiber cables Marine technology Optical fiber communication Robot kinematics Broadcasting

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A Parametric Lyapunov Equation Approach to the Design of Low Gain Feedback

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IEEE Transactions on Automatic control 2008年第6期53卷 1548-1554页

作者： Bin Zhou Guangren Duan Zongli Lin Center of Control Theory and Guidance Technology Harbin Institute of Technology Heilongjiang China Department of Electrical and Computer Engineering University of Virginia Charlottesville VA USA

Low gain feedback has found several applications in constrained control systems, robust control and nonlinear control. Low gain feedback refers to a family of stabilizing state feedback gains that are parameterized in a scalar and go to zero as the scalar decreases to zero. Such feedback gains can be constructed either by an eigenstructure assignment algorithm or through the solution of a parametric algebraic Riccati equation (ARE). The eigenstructure assignment approach leads to feedback gains in the form of a matrix polynomial in the parameter, while the ARE approach requires the solution of an ARE for each value of the parameter. This note proposes an alternative approach to low gain feedback design based on the solution of a parametric Lyapunov equation. Such an approach possesses the advantages of both the eigenstructure assignment approach and the ARE-based approach. It also avoids the possible numerical stiffness in solving a parametric ARE and the structural decomposition of the open loop system that is required by the eigenstructure assignment approach.

关键词： State feedback Linear systems Nonlinear control systems control systems Riccati equations Hydraulic actuators Poles and zeros Performance gain Robust stability Optimal control

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SENSOR FUSION USING FUZZY INTEGRAL AND DIVERSE BAYESIAN NETWORKS

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IFAC Proceedings Volumes 2008年第2期41卷 10421-10426页

作者： Jamie Walls Albert Esterline Abdollah Homaifar Author Autonomous Control and Information Technology Center (ACIT) Electrical & Computer Engineering Department North Carolina Agricultural & Technical State University Greensboro NC

This paper investigates and contrasts the use of different Bayesian networks and a fuzzy integral for real-time sensor fusion using sonar and rangefinder laser values on an ActivMedia robot. Bayesian networks have become increasingly popular because of their ability to capitalize on the conditional probabilities present in an influence chain. The Choquet fuzzy integral, which has primarily been used for statistical analysis, has a great power of description. Comparison of the two methods indicates that noise within the sensor network can drastically affect the accuracy of the results, especially those obtained using the Bayesian network.

关键词： Information and sensor fusion Autonomous robotic systems Data-fusion Multi sensor systems Guidance navigation and control Intelligent robotics

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Measurement-based Small Signal Modeling for the Smart Power IC

Measurement-based Small Signal Modeling for the Smart Power ...

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11th International Conference on electrical Machines and Systems(第11届国际电机与系统会议)

作者： Hee-Jun Kim Hai Xu Hoon Kim School of Electrical Engineering and Computer Science Hanyang University Ansan-si 426-791 Korea Department of Electronics Electrical Control and Instrumentation Engineering Hanyang University

The small signal model of a smart power IC is one of the most important elements for a power system design. This paper presents a measurement-based small signal modeling method for the smart power IC. This method is referred to as sampling the duty cycle output and the control signal input of the smart power IC with the IC's switching frequency. The duty ratio and the control signal are converted into digital data and the data are then transferred into a computer for processing. The smart power IC's transfer function and dynamic model are finally synthesized from measurement data. The result of the modeling experiment is presented for the continuous conduction mode. The practicality and effectiveness are verified through the experiment.

关键词： Power measurement Integrated circuit modeling Power integrated circuits Power system modeling Power system measurements Signal design Frequency measurement Signal sampling Switching frequency Signal processing

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