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Robust regulation of a class of nonlinear singularly perturbed systems

Robust regulation of a class of nonlinear singularly perturb...

引用

作者： Amjadifard, R. Yazdanpanah, M.J. Beheshti, M.T.H. Department of Electrical Engineering Faculty of Engineering Tarbiat Modarres University Tehran Iran Department of Electrical and Computer Engineering Control and Intelligent Processing Center of Excellence University of Tehran Tehran Iran

ISBN: (纸本)008045108X

in this paper, robust regulation of a class of nonlinear singularly perturbed systems, via nonlinear H∞ approach is considered. Under appropriate assumptions, it is shown through two new theorems that the existence of a positive definite solution for the Hamilton-Jacobi-Isaacs inequality related to the problem of disturbance attenuation for the main singularly perturbed system, can be related to the existence of a solution of a (simpler) Hamilton-Jacobi-Isaacs inequality arising in the problem of disturbance attenuation for the reduced-order system. Copyright © 2005 IFAC.

关键词： Perturbation techniques

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GPS-WAAS static error analysis using wavelet decomposition and spectral estimation

GPS-WAAS static error analysis using wavelet decomposition a...

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18th International Technical Meeting of the Satellite Division of The Institute of Navigation, ION GNSS 2005

作者： Dyer, J.W. DeBrunner, V.E. McCartor, G. Fagan, J.E. Department of Electrical and Computer Engineering University of Oklahoma FAA AFS-440 University of Oklahoma Norman School or Electrical and Computer Engineering Center for Structural Control and Vibration Research College of Engineering FAA OU Department of Aviation

The residual error in the WAAS solution contains low frequency elements that reduce the accuracy of the vertical navigation during flight tests of precision approaches conducted at The University of Oklahoma. In an effort to determine if the WAAS-enabled GPS solution can be improved, the character of the errors was first determined. Static position error data from ten, geographically diverse, WAAS reference stations were initially collected continuously over the period of a month. A primary step in identifying the sources of error was to evaluate the spectral (periodic) content of the error signal. However, characterizing the spectral content of the error signal presents problems due to the extremely high sampling rate relative to the extremely slow periods of interest in the error signal. The WAAS signal was sampled at 1 Hz, yet the periods of interest are on the order of 10-5 Hz. Using our proposed method for extracting the near DC frequency content, it is shown that the WAAS residual error primarily contains periodic elements on the order of 6, 12, and 24 hours, which correspond to frequencies of approximately 4.6x10-5, 2.3x10-5, and 1.2x10-5 Hz, respectively. These results were consistent across the disparate geographic regions represented by the data set. Due to this, we think it unlikely that multi-path is responsible for these slow, periodic components in the residual error signal. Therefore, it is likely the periodic elements of the error signal are due primarily to the ionosphere.

关键词： Ground penetrating radar systems

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Optimal design of robust adaptive controllers: A QFT-EEAS based approach using random optimization techniques

Optimal design of robust adaptive controllers: A QFT-EEAS ba...

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5th International Conference on control and Automation, ICCA'05

作者： Sedigh, A. Khaki Namaki-Shoushtari, O. Araabi, B.N. Electrical Engineering Department K.N. Toosi University of Technology Tehran Iran Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran

ISBN: (纸本)0780391381

Quantitative design of robust control systems proposes a transparent and practical controller design methodology for uncertain plants. In the case of large plant uncertainties, the resulted robust controller would be unnecessarily high order with large bandwidth. On the other hand, adaptive controllers can also tackle the control of unknown uncertain plants. However, the controller would be nonlinear and time varying. In this paper, a combined design methodology based on Quantitative Feedback Theory (QFT) and Externally Excited Adaptive System (EEAS) is proposed. This controller can handle large plant parameter uncertainties with lower bandwidth. Also, a random optimization technique is employed to optimally design the overall robust adaptive controller. Simulation results are used to show the effectiveness of the proposed design methodology. © 2005 IEEE.

关键词： Adaptive control systems

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Multiple objective optimization in a spacecraft power system to maximize serviceability

Multiple objective optimization in a spacecraft power system...

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13th International Conference on Intelligent Systems Application to Power Systems, ISAP'05

作者： Momoh, James A. Kaili, Xu IEEE Center for Electrical System and Control Department of ECE Howard University Washington DC 20059 Department of Electrical and Computer Engineering Howard University Washington DC 20059 United States Center for Energy Systems and Control Electrial and Computer Engineering Howard University Washington DC 20059 United States

ISBN: (纸本)1599750287

Different from most power systems, the requirement for reliability of the power system on board a spacecraft is much more stringent. However, the reliability of the spacecraft power system can not be solely realized by increasing system redundancies due to limitations on mass. A Ring-Bus topology has been proposed for this purpose. This paper provides an analysis to this special topology, study selected critical possible failure scenarios and propose methods to maximize the serviceability of the system. A spacecraft power system is distinguished from most other system as it orbits around the earth. The primary source of the system is solar energy. Batteries save energy for ellipse time. To maximize the serviceability, the solar energy should be utilized most efficiently and the batteries should be strategically discharged to meet not only immediate load but anticipated load in the future. At the same time, the system should minimize current flows among different ring buses. Multiple objective functions are proposed and implemented in this paper based on different system operating conditions. The main goal is to maximize the serviceability of the system. The optimization result can be utilized to design controllers for the PV sources, loads and batteries. The proposed methods are tested on a Ring-Bus system. The testing result shows that the system can correctly determine its optimum operating strategy and corresponding control actions. © 2005 ISAP.

关键词： Electric power systems

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Output feedback reconfigurable controller design using eigenstructure assignment: Post-fault order change

Output feedback reconfigurable controller design using eigen...

引用

5th International Conference on control and Automation, ICCA'05

作者： Ashari, Alireza Esna Sedigh, Ali Khaki Yazdanpanah, Mohammad Javad Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran Electrical and Electronics Engineering Department K. N. Toosi University Tehran Iran

ISBN: (纸本)0780391381

This paper proposes a reconfigurable controller design method for multivariable systems, which is capable of dealing with order-change problems that may occurs in an after-fault system. A new method is proposed to recover the nominal closed-loop performance after a fault occurrence in the system. This approach uses the eigenstructure assignment. Unlike the previously developed approaches, the new method can be implemented in the case when the fault leads to order change of the after-fault model. Also, it can be used to solve the problems in which the set of after-fault open-loop and closed-loop eigenvalues have common elements, especially when the system becomes uncontrollable or unobservable due to the fault. The method guarantees the stability of the reconfigured closed-loop system in the presence of output feedback. Finally, simulation results are provided to show the effectiveness of the proposed method for an aircraft model. © 2005 IEEE.

关键词： control theory

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Reconfigurable sliding-mode control design using genetic algorithms and eigenstructure assignment

Reconfigurable sliding-mode control design using genetic alg...

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5th International Conference on control and Automation, ICCA'05

作者： Ashari, Alireza Esna Yazdanpanah, Mohammad Javad Sedigh, Ali Khaki Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran Electrical and Electronics Engineering Department K. N. Toosi University Tehran Iran

ISBN: (纸本)0780391381

This paper proposes a reconfigurable control system design methodology using the sliding-mode control. The advantage of the proposed sliding-mode reconfigurable control methodology is that it is more robust than the simple static reconfigurable feedback. An approach is suggested to redesign the sliding surface for the after-fault variable structure controller using the genetic algorithms. So, the new sliding-mode controller is capable of preserving much of the dynamics of the original unfailed system. Simulation results are provided to show the effectiveness of the proposed method. © 2005 IEEE.

关键词： Sliding mode control

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WLAN differential indoor positioning using reference points

WLAN differential indoor positioning using reference points

引用

Institute of Navigation, 2005 National Technical Meeting, NTM 2005

作者： Chun, Jae Woong Chey, Jaywon Lee, Jang Gyu Jee, Gyu-In Kim, Wuk Department of Electrical Engineering Seoul National Universitiy Department of Electonic Engineering Konkuk University Telecommunication Network Samsung Electronics Co. School of Electrical Engineering and Computer Science Seoul National University School of Electrical Engineering Seoul National University Automatic Control Research Center Department of Electronics Engineering Konkuk University

As the interest of location based-service and ubiquitous environment is proliferated, the development of technologies to determine mobile station location indoors and outdoors is basically demanded for providing various services based on user's location. Representatively, GPS(Global Positioning System) is the most well-known positioning system, but actually isn't an adequate system indoors because of the weakness of positioning signals, NLOS(Non-line of sight) and multipath. Therefore, recently in order to replace it, new technologies using WLAN have been presented. In the thesis, as estimating NLOS errors between mobile station and access points using reference points, a triangulation positioning method based on signal strength will be proposed. Also, indoor positioning experiment results will be shown.

关键词： Global positioning system

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Adaptive H∞-control design for a class of LPV systems

Adaptive H∞-control design for a class of LPV systems

引用

44th IEEE Conference on Decision and control, and the European control Conference, CDC-ECC '05

作者： Karimi, H.R. Moshiri, B. Jabehdar Maralani, P. Lohmann, B. Dept. of Electrical and Computer Engineering Control and Intelligent Processing Center of Excellence University of Tehran Tehran Iran Institute of Automatic Control Technical University of Munich Munich Germany

ISBN: (纸本)0780395689

In this paper, we focus on the issue of adaptive H∞- control design for a class of linear parameter-varying (LPV) systems based on the Hamiltonian-Jacobi-Isaac (HJI) method. By combining the idea of polynomially parameter-dependent quadratic functions and vector projection method to derive an adaptive H∞-control, sufficient conditions with high precision are given to guarantee both robust asymptotic stability and disturbance attenuation of the LPV systems with unknown constant parameters. The applicability of the proposed design method is illustrated on a simple example. © 2005 IEEE.

关键词： Linear systems

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An improved multiagent reinforcement learning algorithm

An improved multiagent reinforcement learning algorithm

引用

2005 IEEE/WIC/ACM International Conference on Intelligent Agent Technology

作者： Xiangping, Meng Babuška, Robert Busoniu, Lucian Yu, Chen Wanyu, Tan Department of Electrical Engineering Changchun Institute of Technology China Delft Center for Systems and Control Delft University of Technology Netherlands Department of Computer Engineering Northeast China Institute of Electric Power China

ISBN: (纸本)0769524168

An improved reinforcement learning algorithm is proposed in this paper. This algorithm is based on linear programming method for finding the best-response policy. A pursuit example is tested and the results show that this algorithm has some properties, such as easy computation, simple operation procedure and can guarantee an good learning convergence. © 2005 IEEE.

关键词： Learning algorithms

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A new active queue management algorithm based on neural networks PI

A new active queue management algorithm based on neural netw...

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作者： Waskasi, M. Yaghoubi Yazdanpanah, M.J. Yazdani, N. Electrical and Computer Engineering Department Control and Intelligent Processing Center of Excellence University of Tehran P.O. Box: 14395/515 Tehran Iran

ISBN: (纸本)008045108X

Active Queue Management (AQM) applies a suitable control policy upon detecting congestion in networks. in this paper, an adaptive Proportional-Integral (PI) controller based on Artificial Neural Networks (ANN) is applied to AQM for the objective of congestion avoidance and control in middle nodes. The proposed controller is simple and can be easily implemented in high-speed routers. Neural Network PI (NNPI) dynamically adapts its parameters with respect to changes in the system. It is anticipated that this results in better response compared to linear controllers due to the nonlinear nature of NNPI. We simulated our method in ns2 and compared its performance with the conventional PI controller. The simulation results show NNPI yields better performance. Copyright © 2005 IFAC.

关键词： Neural networks

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