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Research On Filtering And Fault-tolerant Control For High-speed Maglev Train Suspension System

Posted on:2012-01-28Degree:MasterType:Thesis
Country:ChinaCandidate:W YanFull Text:PDF
GTID:2218330368476179Subject:Detection Technology and Automation
Abstract/Summary:PDF Full Text Request
In order to improve the reliability of Maglev train, this dissertation does some groping study of FTC and filtering problem for suspension system of maglev train, using linear matrix inequality(LMI:Linear Matrix Inequality)approach, state feedback control as well as Lyapun-ov stability theory etc.. The major contents of this dissertation are listed as follows.Starting from the force of single electromagnet, according to the principle of dynamics, mathematical model of single electromagnet suspension system of Maglev train is built by analyzing electromagnetic field on the suspension system. In view of the nonlinear and unsta-ble characteristics, the model is linearized by employing the equilibrium linearization method and transformed into the corresponding state space equation, which is prepared for the follow-up.Adopting passive fault tolerant control, taking into account of the input time-delay and the existence of uncertainties of the system, the problem of designing the robust H∞fault-tolerant controller is studied under the case of actuator failures. According to the Lyapunov stability theory, through introducing a state feedback control, the system input delay is turned into the state delay and a sufficient condition for existing the robust fault tolerant controller is derived by a matrix inequality, then on which basis, through the introduction of performance index Jzw, another sufficient condition for existing the robust H∞fault-tolerant controller is given by another matrix inequality. The designing problem of robust H∞fault tolerant con-troller is attributed to solving linear matrix inequality on the basis of linearizing the original nonlinear matrix inequality. The robust H∞fault-tolerant controller designed can retain robust reliable stability and disturbance attenuation with H∞norm-bounds despite any allowed uncer-tainties and arbitrary actuator failures. In the process of derivation, the less conservative and practical algorithm is adopted, in order that it can reduce the conservative property of design-ed controller in every possible way.Considering the existence of noise from the sensed data, the robust H∞filtering problem for a class of time-delay systems with both external disturbances and norm-bounded parame-tric uncertainties is investigated. Based on Lyapunov method, a robust H∞filter is presented in terms of LMI for all admissible uncertainties. The designed filter can guarantee a prescribed H∞performance level for the filtering error system. The sufficient conditions for existing filter are proposed. Therefore, the problem of designing filter is cast into the solution of linear ma-trix inequality.The fault-tolerant controller and the filter designed are applied into the suspension sys-tem of maglev train. The suspension gap changing case is simulated. Simulation results show that the proposed methods are reasonable.
Keywords/Search Tags:Suspension system, Uncertain time-delay system, Robust H_∞fault-tolerant control, Filtering, Linear matrix inequality
PDF Full Text Request
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