【摘要】 为最大化系统的故障诊断能力,快速实现故障诊断系统设计,应用了基于结构分析法(SA)的故障诊断理论,其主要步骤为:利用失效模式与影响分析(FMEA)获得系统的关键故障,建立其故障模型;通过DM分解和FIM分析,进行系统的故障可检测性和故障可隔离性评估;结合最小型超定方程集(MSO sets),并基于解析冗余关系(ARR)和观测器的参数评估方法,实现系统的残差设计。最后以一款AMT换挡执行器为例,利用SA方法对其进行故障诊断能力分析和FDI系统设计,并在MATLAB/Simulink中对FDI系统进行仿真,验证其有效性。更多还原

【Abstract】 In order to maximize the fault diagnosis capability of system and rapidly design fault diagnosis system,the theory of fault diagnosis based on structural analysis(SA) is applied.Its main procedures are as follows:firstly,the key faults of system are detected by the techniques of failure modes and effects analysis(FMEA)with its fault model established.Secondly,the fault detectability(FD) and fault isolability(FI) of system are evaluated by using Dulmage-Mendelsohn(DM) decomposition and fault isolation matrix(FIM) analysis.Thirdly,combined with minimal structurally over-determined(MSO) sets,the residual design of system is fulfilled based on analytical redundant relation(ARR) and observer-based parameter evaluation techniques.Finally,with the shifting actuator of an automated mechanical transmission(AMT) as an example,an analysis on its fault diagnosis ability and the design of fault detection and isolation(FDI) system are conducted by using SA technique,and a simulation is performed on FDI system with MATLAB/Simulink and the effectiveness of the method adopted is validated.更多还原