分布式网络环境下系统跳变执行器故障诊断

Actuator Fault Diagnosis for System Jumping under Distributed Network Circumstance

针对存在输入干扰的分布式网络环境下系统跳变执行器故障问题,建立了连续时间马尔可夫跳变执行器故障系统模型,并设计了残差生成器.对于多系统网络传输下存在系统跳变的情况,首先在空间几何方法中的不可观测子空间以及空间分割投影运算基础上,运用H∞优化技术和线性矩阵不等式(LMI)方法完成残差生成器参数求解,实现残差对输入的解耦以及与故障的对应关系,并通过残差输出值与预设阈值对比来确定系统中的故障情形,最终完成分布式网络下系统跳变的执行器故障检测与隔离.通过仿真实验验证了算法的有效性.

To solve the problem of system jumping actuator fault problems under the environment of distributed network, the continuous-time Markov jump system with actuator fault was molded and the residual generator was designed. In view of the case of system jumping under the multi-systems network transmission, and based on the unobservability subspace and space division projective operation of space geometry approach, the filter parameters were obtained by utilizing the H∞ optimization technique and linear matrix inequality （LMI） method. As a result, the inputs were decoupled from residuals and the relationships between residuals and faults were correlated. Furthermore, by comparing and analyzing the residual inputs and preset thresholds, the actuator faults were determined, by which the problem of system jumping actuator faults detection and isolation in the distributed network was addressed. Simulation results demonstrated the effectiveness of the proposed method.