基于低冗余度的传感器故障诊断研究

对于大型飞机来说,飞行控制系统各部件(包括传感器)多采用高余度的硬件配置来提高系统的任务可靠性,但对小型飞机来说,由于受重量、空间及费用等原因的影响,一些传感器不适合安装三余度或四余度传感器。对于二余度或单传感器来说,如何鉴别故障传感器或判断传感器是否发生故障较为困难。同样,传统的故障诊断与隔离方法并不能隔离三余度传感器系统中的多个故障。为了解决低冗余度传感器故障诊断问题,提出一种不依赖数学模型的奇偶方程方法与小波分析相结合的传感器故障诊断方法。

Study of Low Hardware Redundancy Sensor Fault Detection

Flight control system always use high level hardware redundancy configuration to improve mission reliability for big aircraft, but it is not reasonable to install triple or quadruple sensor redundancy on small aircraft due to the limitations on space, weight and cost. It is very difficult to identify the failure with dual or single sensor. Also,conventional fault detection and isolation method cannot isolate multiple faults in a triple redundancy system. To solve this problem, a kind of non-model based fault diagnosis which combines a parity equation approach with the wavelet based technique were introduced in this paper.