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针对含未知有界干扰输入的线性系统进行传感器故障检测研究.通过对输出信号进行非奇异线性变换,将传感器故障等效转化为执行机构故障,提出对干扰具有鲁棒性、对故障具有敏感性的残差生成方法,设计滑模观测器进行残差估计,实现对传感器故障的检测,得到对传感器故障信号的精确估计,并实现对传感器信号的重构.基于飞机纵向小扰动模型,对于传感器的缓变偏差、突变偏差、完全失效和反相等故障的信号重构仿真结果都表明了该方法的有效性.
Aiming at the problem of sensor fault detection in linear systems with unknown bounded disturbance input, the fault of sensor is equivalently transformed into the fault of actuator by non-singular linear transformation of the output signal, which is robust to interference and sensitive to faults The residual error is generated, and the sliding mode observer is designed to estimate the residual, so as to detect the sensor fault and get the accurate estimation of the sensor fault signal and to reconstruct the sensor signal. Based on the small longitudinal disturbance model, The simulation results of signal reconstruction including gradual deviation, abrupt variation, complete failure and anti-phase failure all indicate the effectiveness of the proposed method.