基于Fuzzy数学的飞机自动停车故障诊断

飞机本身是一个复杂的系统.因此,系统及分系统的故障也是纷繁复杂的,反映在故障征兆(表象)与原因上,同一故障征兆可能是多种原因所引起的,而同一故障原因又往往产生多种故障征兆.对于故障征兆与故障原因间的复杂隶属关系,如果使用传统的经典数学模型来处理往往不能准确的解决问题.本文将模糊数学方法引入到飞机故障诊断中,建立了某型飞机自动停车故障诊断的数学模型,解决了针对一种或数种故障征兆,如何准确、快速地找到引起故障的真正原因,并且针对最大隶属度原则的缺陷,改进了该原则,此诊断方法可以按飞机系统功能分解推广到对任一分系统(如液压系统,燃料系统,冷气系统,着陆装置系统等)的故障诊断.

Malfunction Diagnosis of Airplane Automatous Shutdown Based on the Fuzzy Mathematics

Because airplane oneself is a complicated system,the malfunctions of system and subsystem are very complicated.For the omen and the reason of malfunctions,the same malfunction can be caused by many facts,and the same malfunctions can lead in a lot of malfunction omens.For the complicated relation between the malfunction omen and the malfunction reason,the traditional classical mathematics cannot exactly diagnose the airplane malfunctions.In this thesis we draw fuzzy mathematic method into airplane malfunction diagnosis, found the fuzzy diagnostic model of automatic airplane shutdown,resolve one or several malfunctions,and fast find how to cause malfunction reasons.Then we illustrate how to improve membership grade rule.This diagnosis method may be used to diagnose failure of every subsystem(hydraulic pressure system,fuel system,cold air system,landfall system etc.).