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针对不确定性非线性系统,讨论基于观测器的执行器故障的检测和重构方法.首先,通过设计滑模全维观测器,产生对干扰具有鲁棒性、对故障具有敏感性的残差,来达到故障检测的目的;然后,设计能直接消去干扰和故障影响的降维观测器来达到状态渐近收敛估计,并在此基础上,提出故障重构方法;基于微分方程的数值解方法和函数微分的数值解方法,给出一种故障重构的数值解方法;最后,对一个实际模型进行仿真,结果表明了该方法的实用性.
For the uncertain nonlinear systems, the observer-based actuator fault detection and reconstruction methods are discussed.Firstly, by designing the sliding mode full-dimensional observer, residuals with robustness and fault sensitivity are generated , So as to achieve the purpose of fault detection. Then, a dimension reduction observer which can eliminate the influence of interference and fault directly is designed to achieve state asymptotic convergence estimation. On the basis of this, a fault reconstruction method is proposed. Numerical solution based on differential equation And the method of numerical solution of function differential, a numerical solution method of fault reconstruction is given. Finally, an actual model is simulated and the result shows the practicability of the method.