全修复策略下FADEC系统多故障TLD仿真分析

由于航空发动机全权限电子控制(FADEC)系统的时间限制派遣(TLD)分析是航空发动机型号合格审定的一项必要工作,针对目前FADEC系统的多故障TLD仿真分析方法中没有考虑短时限制派遣(ST)值可变以及维修策略对TLD分析影响的不足,提出了全修复策略下FADEC系统的多故障TLD仿真分析方法。分析和比较了现有的FADEC系统维修策略,按照机会维修或成组维修原理,提出了全修复策略。按照全修复策略,开展了仿真建模分析,设计和研究了多故障TLD的仿真流程和方法。通过实例仿真与分析,验证了所提仿真方法不受FADEC系统中零部件数量的影响,而且相对于单故障Markov模型,增加了占总故障数量8.84%的组合故障,提高了分析精度。

TLD simulation analysis with multiple faults for FADEC system ,under full repair policy

The time-limited dispatch (TLD) analysis of the full authority digital control (FADEC) system is an important part of type certification of aero-engine. In order to make up for the existing TLD simulation analysis without taking into account the effect of the repair policy on TLD, and the short time as a variable, a TLD simulation analysis with multiple faults for FADEC system under full repair policy was proposed. The existing maintenance policies for FADEC system were compared, and according to the principle of opportunity maintenance or group maintenance, the full repair policy was presented. On the basis of the full repair policy, the analysis of simulation modeling was carried out, and the simulation process and method were designed and studied. The applicability and rationality of the proposed simulation analysis were verified through specific FADEC system. Results showed that the proposed simulation analysis was not affected by the number of parts in FADEC system, and in relation to single fault Markov model, the combined faults accounting for 8.84% of the total faults were analyzed, helping to improve the analysis accuracy.