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Identification of a stable model for a flexible plate using frequency domain subspace methods

IFAC Proceedings Volumes 2011年第1期44卷 6517-6522页

作者： Saeed Ahmadizadeh Allahyar Montazeri Javad Poshtan Electrical Engineering Department Iran University of Science and Technology Tehran Iran Computer Science and Automation Faculty Ilmenau University of Technology Ilmenau Germany

Abstract having a suitable model is one of the most important steps in active noise and vibration control systems. There are many applications in which the derived numerical model does not show the system behavior appropriately. In such cases, obtaining a model using system identification methods can play a special role. To this aim, in this paper the problem of identification of a flexible plate which is attached to upper side of an enclosure is addressed. The frequency response of the plate is measured between the two specific points and the data are applied to the several subspace-based frequency domain identification algorithms with and without Instrumental Variable method. Since the real system, by nature, is stable and the models identified in all cases are unstable, in the next step stabilization algorithm with different initial values is used to extract the stable part of the system. Finally, the qualities of the stabilized identified models are evaluated by calculating the RMS error between the measured and identified models.

关键词： System Identification Subspace methods Vibration measurement Active control

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An anti-slip predictive controller for a V-PRA vehicle

An anti-slip predictive controller for a V-PRA vehicle

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作者： Cochior, Carmen De Keyser, Robin Lazar, Corneliu Electrical Engineering Department Eindhoven University of Technology Eindhoven Netherlands EeSA-Department of Electrical Energy Systems and Automation Ghent University Ghent Belgium Department of Automatic Control and Applied Informatics Faculty of Automatic Control and Computer Engineering Technical University Gh. Asachi Iasi Romania

ISBN: (纸本)9783902661937

In this paper an anti-slip predictive controller is designed and implemented in order to control the rear wheels of a V-PRA (Variable Powered Rear Axle) vehicle. The control algorithm is EPSAC, a Model based Predictive Control (MPC) strategy. It uses explicitly a model of the system for the prediction of the future system output, in order to calculate the optimal control input which will bring the system to a required setpoint. The main goals of this predictive controller were setpoint trajectory following, disturbance rejection and maintain overall the stability of the V-PRA vehicle. Although the process is nonlinear, being influenced by several parameters, linear discrete-time ARX models could be obtained based on system linearization around an operating point. An initial SISO controller was developed and tested, based on a Simulink model of the process. The control performances were tested successfully in presence of all kind of disturbances, denoting a robust controller. © 2011 IFAC.

关键词： Vehicles

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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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Robust H∞ control of switched uncertain time-varying delay discrete-time systems via dynamic output feedback

Robust H∞ control of switched uncertain time-varying delay ...

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7th International Conference on Electrical and Electronics engineering, ELECO 2011

作者： Song, Zhengui Dimirkovsky, Gyorgyi Zhao, Jun Institute of Integrated Process Automation College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China Departments of Computer Eng. and Control Eng. Faculty of Engineering Dogus University Acibadem Zeamet Sokak 21 Kadikoy TR-34722 Istanbul Turkey Institute of Automation and Systems Eng. Faculty of Electrical Eng. and Info. Technologies SS Cyril and Methodius University Karpos 2 BB MK-1000 Skopje Macedonia

ISBN: (纸本)9786050102048

Robust H∞ output feedback control problem for a class of switched linear discrete-time systems possessing norm-bounded uncertainty and time-varying delay is investigated. A switched dynamic output feedback controller is sought that can robust exponentially stabilize and reduce to a prescribed level the effect of disturbance input on the controlled output in the closed loop. A delay-dependent linear matrix inequality based sufficient condition for the problem to be solvable is derived via the switched Lyapunov functions. Controller design is performed by solving a set of linear matrix inequalities. An illustrative example along with simulation results is given to demonstrate the validity of these novel derivations. © 2011 Chamber of Turkish Electric.

关键词： Linear matrix inequalities

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Sliding mode control of switched uncertain linear systems: Designing robust H∞ sliding surface

Sliding mode control of switched uncertain linear systems: D...

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7th International Conference on Electrical and Electronics engineering, ELECO 2011

作者： Lian, Jie Dimirkovsky, Gyorgyi Zhao, Jun Institute of Integrated Process Automation College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China Departments of Computer Eng. and Control Eng. Faculty of Engineering Dogus University Acibadem Zeamet Sokak 21 Kadikoy TR-34722 Istanbul Turkey Institute of Automation and Systems Eng. Faculty of Electrical Eng. and Info. Technologies SS Cyril and Methodius University Karpos 2 BB MK-1000 Skopje Macedonia

ISBN: (纸本)9786050102048

The robust H∞ control problem for a class of uncertain switched linear systems by using the variable structure control is investigated. A robust H∞ single sliding surface is shown to exist as long as a convex combination of the subsystems of the switched system is robustly stabilizable with disturbance attenuation level γ. A switching law is constructed via the single Lyapunov function technique. Variable structure controllers of subsystems are designed so as the resulting closed-loop system guarantees the robust H∞ performance. An illustrative example and simulation results are given to demonstrate the effectiveness of the proposed design method. © 2011 Chamber of Turkish Electric.

关键词： Sliding mode control

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Efficient methods for robust classification under uncertainty in kernel matrices

The Journal of Machine Learning Research

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The Journal of Machine Learning Research 2012年第1期13卷

作者： Aharon Ben-Tal Sahely Bhadra Chiranjib Bhattacharyya Arkadi Nemirovski William Davidson Faculty of Industrial Engineering and Management Technion - Israel Institute of Technology Technion City Haifa Israel Department of Computer Science and Automation Indian Institute of Science Bangalore Karnataka India H. Milton Stewart School of Industrial and Systems Engineering Georgia Institute of Technology Georgia Atlanta Georgia

In this paper we study the problem of designing SVM classifiers when the kernel matrix, K, is affected by uncertainty. Specifically K is modeled as a positive affine combination of given positive semi definite kernels, with the coefficients ranging in a norm-bounded uncertainty set. We treat the problem using the Robust Optimization methodology. This reduces the uncertain SVM problem into a deterministic conic quadratic problem which can be solved in principle by a polynomial time Interior Point (IP) algorithm. However, for large-scale classification problems, IP methods become intractable and one has to resort to first-order gradient type methods. The strategy we use here is to reformulate the robust counterpart of the uncertain SVM problem as a saddle point problem and employ a special gradient scheme which works directly on the convex-concave saddle function. The algorithm is a simplified version of a general scheme due to Juditski and Nemirovski (2011). It achieves an O(1/T2) reduction of the initial error after T iterations. A comprehensive empirical study on both synthetic data and real-world protein structure data sets show that the proposed formulations achieve the desired robustness, and the saddle point based algorithm outperforms the IP method significantly.

关键词： kernel functions robust optimization uncertain classification

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Modeling and simulation of water fountain control software in ptolemy II

Advances in Intelligent and Soft Computing

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Advances in Intelligent and Soft Computing 2011年 105卷 219-224页

作者： Zhang, Ying Zhang, Jing Faculty of Information Engineering and Automation Computer Technology Application Key Lab of Yunnan Province Kunming University of Science and Technology Kunming Yunnan China

ISBN: (纸本)9783642237553

There are two methods to design software model, object-oriented and component-oriented. Embedded system has the characteristics of real-time, hierarchy and heterogeneousness. Disadvantage of object-oriented method is so much functional coupling that system's characteristics cannot be described well. Component-oriented method can meet the system's characteristics well because of components independent from each other. We introduce actor-oriented Ptolemy II modeling method, using atomic actor and composite actor by tree structure to solve hierarchy of the system, and using different computation model interaction to solve real-time heterogeneity of the system. This paper describes the principle of small water fountain control software and compares the advantages and disadvantages between component-oriented Ptolemy II platform and object-oriented UML modeling. Water fountain control software is modeled in the form of different actor-oriented components and then simulates based on Ptolemy II platform. As a result, expected result is achieved. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Trees (mathematics)

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Research and implement on industry control networks based on embedded SERCOS-III protocol

Research and implement on industry control networks based on...

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International Conference on Electronics, Communications and Control (ICECC)

作者： Qiu-Fang He Qi-Jie Zeng Xiong-Min Tang Department of Computer engineering Guangdong Industry Technical College Guangzhou China Faculty of Automation Guangdong University of Technology Guangzhou China

SERCOS-III is the international standard on the third generation serial communication protocol for real-time data communication among the controller and actuators with the advantage of openness, compatibility, high speed, and reliability. Based on studying on the SERCOS-III protocol and ARM embedded control technology, presents one kind of SERCOS-III high speed communication system and discusses the technical implement details of hardware and software. Furthermore, a reduced TCP/IP protocol is supported in the IP channel so that the configuration parameters and the situation detections of the slaves can be operated through the internal IP channel. The simulation experiments of a network control system are presented to validate the proposed system.

关键词： Static VAr compensators IP networks Real time systems computer numerical control Protocols Educational institutions Conferences

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New method of detection and wiping of sensitive information

New method of detection and wiping of sensitive information

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IEEE International Conference on Intelligent computer Communication and Processing (ICCP)

作者： George Pecherle Cornelia Győrödi Robert Győrödi Bogdan Andronic Iosif Ignat Faculty of Electrical Engineering and Information Technology University of Oradea Oradea Romania Faculty of Automation and Computer Science Technical University of Cluj-Napoca Cluj-Napoca Romania

One of the biggest problems in sensitive data wiping is to determine if a file is sensitive or not. Data wiping applications have improved a lot, but they cannot determine by themselves if a file is sensitive. The method we propose tries to determine if a file is sensitive by using a pre-defined set of rules initially specified by the user. These rules can update themselves in time, by “learning” from data patterns in previous sensitive files. The hard drive is monitored continuously to detect new sensitive data. Also, our method replaces the standard delete function from Windows with a secure wiping algorithm (overwriting data several times with pre-defined passes), but only for files that are determined to be sensitive.

关键词： Operating systems Monitoring computers File systems US Department of Defense Natural languages computer science

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Trajectory Tracking Control of Pendulum with Variable Length by Partial Energy Shaping * *

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IFAC Proceedings Volumes 2011年第1期44卷 10679-10684页

作者： Xin Xin Tatsuya Shinji Taiga Yamasaki Changyin Sun Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 Japan School of Automation Southeast University Nanjing 210096 China

Abstract This paper concerns a trajectory tracking control problem for a pendulum with variable length, which is an underactuated mechanical system of two degrees-of-freedom with a single input of adjusting the length of the pendulum. We aim to study whether it is possible to design a time-invariant control law to pump appropriate energy into the variable-length pendulum for achieving a desired swing motion (trajectory) with given desired energy and length of the pendulum. First, we show that it is difficult to avoid singular points in the controller designed by using the conventional energy-based control approach in which the total mechanical energy of the system is controlled. Second, we propose a tracking controller free of singular points by shaping only the kinetic energy of rotation and the potential energy of the pendulum and not utilizing the kinetic energy related to the motion along the rod. Third, we analyze globally the motion of the pendulum and clarify the stability issue of some closed-loop equilibrium points; and we also provide some conditions on control parameters for achieving the tracking objective. Finally, we present numerical simulation results to validate the presented theoretical results.

关键词： Trajectory tracking control nonlinear control pendulum swing variable length stability analysis energy shaping Lyapunov stability

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