In this paper,the adaptive bounded-H∞ fault-tolerant control problem with prescribed performance is studied for a class of nonlinear systems with external disturbances and sensor faults.A new design method of prescribed perfor-mance control is proposed,which makes the selection of the prescribed performance function be completely independent of the initial state of the constrained variable in the system.The problem that the control effect of traditional prescribed performance control method depends on the initial condition of the constrained variable is solved by a novel way.Based on this design method and the bounded-H∞ control method,an adaptive prescribed performance bounded-H∞ controller is obtained under the unknown initial condition of the system.The designed controller can ensure that all the signals in the system are bounded stable,the output variable of the system can be constrained by the prescribed performance function,and the system has a better inhibition ability to external disturbances.Finally,the simulation results verify the feasibility and effectiveness of the proposed controller.
关键词
非线性系统/传感器故障/预设性能控制/无需初始条件/有界H∞控制/容错控制
Key words
nonlinear systems/sensor faults/prescribed performance control/regardless of initial condition/bounded-H∞ control/fault-tolerant control
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