基于特征结构配置的飞控系统故障检测与诊断

针对具有未知扰动输入的飞行控制系统,运用特征值配置设计了一种用于故障检测和诊断的观测器,他通过对观测器进行左特征向量的配置使得残差与干扰分布方向正交,故障检验残差r与未知输入干扰d之间的传递函数阵为零,从而使残差与干扰直接解耦.通过这种方法,残差信号得以对干扰具有鲁棒性,使FDI算法不受系统不确定性干扰的影响,提高系统故障诊断的可靠性和精度.同时通过残差信号估计故障,能在线辨识故障的形态,仿真结果验证了该方法的有效性.

Fault Detection and Diagnosis Based on Eigenstructure Assignment in Flight Control System

The observer of fault detection and diagnosis is designed based on eigenstrueture assignment aimed at flight con trol system having unknown input disturbances. It makes residual in quadrature with disturbances distributed direction through left eigenstructure assignment to observer. The transfer function is zero between fault detection residual r and unknown input disturbance d.So it makes residual decoupling and robust with disturbance. The fault diagnosis and isolation algorithm is not influenced by the system uncertain disturbances. The reliability and precision of fault diagnosis are improved. Meanwhile it can identify faults shape online through residual estimating faults. The simulation results verify method validity.