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利用H_-/H_∞未知输入观测器方法研究线性切换系统的故障检测问题.将未知输入干扰分解为可解耦和不可解耦两部分,从估计误差中消除可解耦部分,再使用加权H_-/H_∞混合性能指标表示剩余未知输入和故障对残差的影响,将故障检测问题等价为加权H_-/H_∞未知输入观测器设计问题.根据平均驻留时间技术和多Lyapunov函数方法设计了故障检测器参数,并利用松弛矩阵方法得到了进一步的结果.通过一个仿真例子对所提出方法进行了验证.
The H_- / H_∞ unknown input observer is used to study the fault detection of linear switched systems. The unknown input disturbance is decomposed into decoupleable and non-decouplable parts, the decouplable part is eliminated from the estimation error, and the weighted H_ - / H_∞ mixed performance index indicates the residual unknown input and fault impact on the residual, the fault detection problem is equivalent to the weighted H_- / H_∞ unknown input observer design problem.According to the average dwell time technique and the multi-Lyapunov function method The fault detector parameters are designed and further results are obtained by using the relaxation matrix method.The proposed method is verified by a simulation example.