Dissertation > Excellent graduate degree dissertation topics show
H_∞ Control of SampledData Control Systems
Author: LiuYanWen
Tutor: WangGuangXiong
School: Harbin Institute of Technology
Course: Control Theory and Control Engineering
Keywords: sampleddata control system lifting technique H_∞design mixedsensitivity robust stability
CLC: TP13
Type: PhD thesis
Year: 2006
Downloads: 472
Quote: 4
Read: Download Dissertation
Abstract
This dissertation is about the H_∞design for sampleddata control systems.Problems from the design by using the popular lifting technique are discussed andanalyzed, and new methods for the H_∞design of sampleddata systems areproposed.The lifting technique for sampleddata control systems is studied first, and theformulas for lifting computation are derived carefully. Because the computation israther complicated, a lifting algorithm is proposed by using MATLAB functions.The H_∞lifted plant and the corresponding L2 induced norm can easily beobtained with the proposed algorithm.The lifting technique is then used for H_∞synthesis problems such as H_∞mixed sensitivity problem, robust stability problem and the disturbance attenuationproblem. It is pointed out that for the closedloop sampleddata control system, thesystem norm is not preserved by the lifting as expected, i.e., there is a differencebetween the two norms. Two conditions A1 and A2 required for using the liftingtechnique in H_∞design are given, and it is pointed out that only the disturbanceattenuation design with no weighting functions or with weighting coefficients canmeet these assumptions, hence the practical application of the lifting technique inH_∞design is quite limited.The frequency response of sampleddata control systems is studied in detail.The presently accepted definition of the frequency response and the relatedcomputation with timedomain and frequencydomain lifting techniques are analyzedand discussed, and it is pointed out that the frequency response thus obtained isindeed the frequency response of the lifted system. Because the frequency responseof the system can not be preserved by lifting, the frequency response of the liftedsystem has nothing to do with the real frequency response of the sampleddatacontrol system.Notice that the signal channel of the system is really composed of twoparts——a continuoustime part and a discretetime one, so a new method forcomputing the frequency response of the sampleddata control system is proposedaccording to the special structure of the sampleddata control system. This method iswith clear physical meanings, and the result can be checked by various methods. TheL2induced norm of the system can also be obtained from the frequency response

Related Dissertations
 Study on a Pneumatic Manipulator Clamping Force Control System Based on H ∞ Control Theory,TP241
 Researches on System Control Theories and Their Applications of AUVs,TP13
 Stability of a class of stochastic delay system,TP13
 Robust Dissipative generalized bilinear control systems,TP13
 The Research of the Stability of the Neural Network Based on the Nonsmooth Anaslysis,TP183
 The Stability Research for a Class of Static Neural Networks,TP183
 Research of Lifting Technology Conversion in High Pour Piont Oil,TE355
 Research on Robust Controller Design and Expriments for Elctromechanical Position Servo System,TM921.541
 Stability and Passive Control of Singular Systems,TP13
 Robust Dynamical Order Assignment for Linear Descriptor Systems,TP13
 Robust Control of Multitime Delay Singular Systems with Linear Fractional Parametric Uncertainties,TP13
 Reserch of Stability for a Class of Neural Networks with Constant Delays,O177;O189
 Robust Stability and Robust H_∞ Control Problem for Nonlinear Singular System with Uncertainty,TP13
 Stability Analysis of Uncertain Stochastic Nonlinear Systems with Timedelays,TP13
 Robust Stability of network control system,TP273
 On the Dynamics of Gene Regulatory Networks Models with Delays,TP183
 Research on Design and Experiment of Servo System Using Robust Control,TM921.541
 The Design Analysis and Simulation for BanktoTurn Control System of Guidance Aerial Bomb,TJ414
 Magnetic bearing H_ ∞ Centralized Controller,TH133.3
 Researches on Robust Control and Application of NonMinimum Phase Systems,TP13
 The Application and Research of Mixed Sensitivity Method in System with Parameters Varying in Large Range,TP273
CLC: > Industrial Technology > Automation technology,computer technology > Automated basic theory > Automatic control theory
© 2012 www.DissertationTopic.Net Mobile
