检索结果-内蒙古大学图书馆

SMVSC for a class of time-delay uncertain systems with mismatching uncertainties

IEE PROCEEDINGS-CONTROL theory AND applications 2000年第6期147卷 687-693页

作者： Hu, J Chu, J Su, H Zhejiang Univ Inst Adv Proc Control Natl Lab Ind Control Technol Hangzhou 310027 Peoples R China

A sliding-mode control approach is proposed for a class of uncertain time-delay systems with mismatching uncertainties. It is based on the linear matrix inequality technique and the sliding-mode variable structure control method. A simulation study for a numerical example is given to illustrate the effectiveness of this approach in control design.

关键词： sliding-mode variable structure control method uncertain systems variable structure systems linear matrix inequality technique control system synthesis sliding-mode control approach time-delay uncertain systems Multivariable control systems Distributed parameter control systems delay systems mismatching uncertainties Stability in control theory stability matrix algebra Control system analysis and synthesis methods algebra

来源：评论

学校读者我要写书评

暂无评论

Robust H_∞ control for uncertain linear time-invariant descriptor systems

引用

IEE PROCEEDINGS-CONTROL theory AND applications 2000年第6期147卷 648-654页

作者： Huang, JC Wang, HS Chang, FR Natl Taiwan Univ Dept Elect Engn Taipei 106 Taiwan Ind Technol Res Inst Ctr Aviat & Space Technol Hsinchu 310 Taiwan

The H-infinity control problem for uncertain descriptor systems with time-invariant norm-bound uncertainty in the state matrix is considered. Necessary and sufficient conditions for robust H-infinity control of descriptor systems by state feedback and dynamic output feedback are derived. The design results are expressed in terms of generalised algebraic Riccati inequalities, which may be considered an extension of results given in recent literature. Explicit formulae for controllers which solve the corresponding problems are provided. The generalised algebraic Riccati inequalities approach used is based on a version of the bounded real lemma for descriptor systems, thus making the given proofs simpler.

关键词： algebra Riccati equations descriptor systems Differential equations (numerical analysis) uncertain systems differential equations algebraic Riccati inequality H∞ control bounded real lemma robust control Stability in control theory Optimal control closed loop systems linear time-invariant systems Control system analysis and synthesis methods linear systems feedback

来源：评论

学校读者我要写书评

暂无评论

Solution of infinite linear systems by automatic adaptive iterations

引用

linear algebra AND ITS applications 2000年第1-3期318卷 209-225页

作者： Favati, P Lotti, G Menchi, O Romani, F Univ Pisa Dipartimento Informat I-56100 Pisa Italy Univ Parma Dipartimento Matemat I-43100 Parma Italy CNR IMC I-56010 Pisa Italy

The problem of approximating the solution of infinite linear systems finitely expressed by a sparse coefficient matrix in block Hessenberg form is considered. The convergence of the solutions of a sequence of truncated problems to the infinite problem solution is investigated A family of algorithms, some of which are adaptive, is introduced, based on the application of the Gauss-Seidel method to a sequence of truncated problems of increasing size n(i) with non-increasing tolerance 10(-ti). These algorithms do not require special structural properties of the coefficient matrix and they differ in the way the sequences {n(i)} and {t(i)} are generated. The testing has been performed on both infinite problems arising from the discretization of elliptical equations on unbounded domains and stochastic problems arising from queueing theory. Extensive numerical experiments permit the evaluation of the various strategies and suggest that the best trade-off between accuracy and computational cost is reached by some of the adaptive algorithms. (C) 2000 Elsevier Science Inc. All rights reserved. AMS classification: 65F10;65N22;60K25.

关键词： infinite linear systems iterative methods

来源：评论

学校读者我要写书评

暂无评论

Reliable control of discrete-time systems with actuator failure

引用

IEE PROCEEDINGS-CONTROL theory AND applications 2000年第4期147卷 428-432页

作者： Yang, Y Yang, GH Soh, YC Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

The paper considers the problem of LQ regulator design for discrete-time systems with actuator failures. The problem is to design a reliable LQ state feedback regulator which can tolerate actuator failures, such that the cost of the system is guaranteed to be within a certain bound. The state feedback control design for guaranteed cost control is given in terms of solution to an algebraic Riccati equation. The resulting control system is reliable, in that it provides guaranteed asymptotic stability despite some actuator failures. A numerical example shows the effectiveness of the method.

关键词： linear quadratic control asymptotic stability state feedback Riccati equations Optimal control discrete-time systems LQ control algebra linear systems algebraic Riccati equation Discrete control systems control system synthesis discrete time systems actuator failure guaranteed cost control Control system analysis and synthesis methods fault tolerance robust control Stability in control theory

来源：评论

学校读者我要写书评

暂无评论

Design and evaluation of a linear algebra package for Java

Design and evaluation of a linear algebra package for Java

引用

ACM 2000 Java Grande conference

作者： Almasi, G. Gustavson, F.G. Moreira, J.E. Department of Computer Science Univ. Illinois at Urbana-Champaign Urbana IL 61801 United States IBM T.J. Watson Research Center P. O. Box 218 Yorktown Heights NY 10598 United States

ISBN: (纸本)1581132883

This paper describes the design of a high-performance linear algebra library for Java. linear algebra libraries such as ESSL and LAPACK are important tools of computational science and engineering, and have been available to C and Fortran programmers for quite a while. If Java is to become a serious language for the development of large scale numerical applications, it must provide equivalent functionality. From the many possible alternatives to accomplish this goal, we took the approach of designing a linear algebra library entirely in Java. This approach leads to good portability and maintainability of the code. It is also a good test of how far we can push Java performance. We adopted an object-oriented design in which the linear algebra operations are implemented as strategy design patterns. The higher level algorithms, optimized for the memory hierarchies of present-day machines, are described in a type independent manner. Type specific methods capture the lower level optimizations for operations on matrices of single-precision, double-precision, or complex numbers. We evaluate the performance of our linear algebra package on three different machines. Our preliminary results show that our Java library achieves up to 85% of the performance of the highly optimized ESSL.

关键词： Java programming language

来源：评论

学校读者我要写书评

暂无评论

Sparse pattern selection strategies for robust Frobenius-norm minimization preconditioners in electromagnetism

引用

numerical linear algebra WITH applications 2000年第7-8期7卷 667-685页

作者： Carpentieri, B Duff, IS Giraud, L CERFACS F-31057 Toulouse France Rutherford Appleton Lab Didcot OX11 0QX Oxon England

We consider preconditioning strategies for the iterative solution of dense complex symmetric non-Hermitian systems arising in computational electromagnetics. We consider in particular sparse approximate inverse preconditioners that use static non-zero pattern selection. The novelty of our approach comes from using a different non-zero pattern selection procedure for the original matrix from that for the preconditioner and from exploiting geometric or topological information from the underlying meshes instead of using methods based on the magnitude of the entries. The numerical and computational efficiency of the proposed preconditioners are illustrated on a set of model problems arising both from academic and from industrial applications. The results of our numerical experiments suggest that the new strategies are viable approaches for the solution of large-scale electromagnetic problems using preconditioned Krylov methods. In particular, our strategies are applicable when fast multipole techniques are used for the matrix-vector product on parallel distributed memory computers. Copyright (C) 2000 John Wiley & Sons, Ltd.

关键词： preconditioning techniques Frobenius-norm minimization method non-zero pattern selection strategies electromagnetic scattering applications

来源：评论

学校读者我要写书评

暂无评论

Software-implemented fault detection for high-performance space applications

Software-implemented fault detection for high-performance sp...

引用

International conference on Dependable Systems and Networks

作者： Turmon, M Granat, R Katz, DS CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0769507077

We describe and test a software approach to overcoming radiation-induced errors in spaceborne applications running on commercial off-the-shelf components. The approach uses checksum methods to validate results returned by a numerical subroutine operating subject to unpredictable errors in data. We can treat subroutines that return results satisfying a necessary condition having a linear form;the checksum tests compliance with this condition. We discuss the theory and practice of setting numerical tolerances to separate errors caused by a fault from those inherent infinite-precision numerical calculations. We test both the general effectiveness of the linear fault tolerant schemes we propose, and the correct behavior of our parallel implementation of them.

关键词： Computer system recovery

来源：评论

学校读者我要写书评

暂无评论

Proceedings of the 39th IEEE conference on Decision and Control December 12-15, 2000, Sydney Convention and Exhibition Centre Sydney, Australia

Proceedings of the 39th IEEE Conference on Decision and Cont...

引用

39th IEEE Confernce on Decision and Control

This Volume 5 of 5 of the conference proceedings contains 196 papers. Topics discussed include optimization, robust stability analysis, numerical methods in control, filtering in stochastic systems, signal processing, fault detection and analysis, nonlinear time delay systems, nonlinear control, disturbance rejection, process control industry applications, linear parameter varying systems, linear control systems, dynamic and nonlinear programming, model reduction applications, hidden Markov models, linear design, ambulatory robot systems, chaotic and oscillatory systems, biomedical system control, CPU scheduling, adaptive disturbance, noise compensation, sensitivity design, analysis and limitations, robotics, tracking control, Lagrangian and Hamiltonian theory, variable structure control, machine vision and applied nonlinear control.

关键词： Control theory

来源：评论

学校读者我要写书评

暂无评论

The nonlinear problem of the optimal libration points rendezvous in earth-moon system

The nonlinear problem of the optimal libration points rendez...

引用

Astrodynamics Specialist conference 2000

作者： Marinescu, A. Dumitrache, M. National Institute of Aerospace Researches Bucharest Romania

In this paper the minimum propellant optimal maneuvers of space vehicles equipped with low-thrust propulsion installation near the libration points in the Earth-moon system are examinated. The variational problem for determining the optimal laws of variation the motion parameters, is a Lagrange type considering the nonlinear motion equations, and lead to a bilocal problem. The numerical integration of the extremals equations is performed with shooting method, the calculus being simplified using initial values of the multipliers from linear theory, Ref 2. On the basis of the optimal laws established in this manner, numerical applications are carried out. © 2000 by the American Institute of Aeronautics and Astronautics, Inc. All right reserved.

关键词： numerical methods

来源：评论

学校读者我要写书评

暂无评论

Automated Macromodelling of Time-Varying Systems, with RF applications 55

Automated Macromodelling of Time-Varying Systems, with RF Ap...

引用

55th ARFTG conference Digest, ARFTG 2000

作者： Roychowdhury, Jaijeet Bell Laboratories Murray HillNJ United States

ISBN: (纸本)0780356861

We present a theory for reduced-order modelling of linear time-varying systems, together with efficient numerical methods for application to large systems. The technique, called TVP (Time-Varying Padé), is applicable to deterministic as well as noise analysis of many types of communication subsystems, such as mixers and switched-capacitor filters, for which existing model reduction techniques cannot be used. TVP is therefore suitable for hierarchical verification of entire communication systems. We present practical applications in which TVP generates macromodels which are more than two orders of magnitude smaller, but still replicate the input-output behaviour of the original systems accurately. The size reduction results in a speedup of more than 500. © 2000 IEEE.

关键词： Time varying systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：