民用飞机典型部件的可靠性分析

运用FMECA方法(故障模式影响及危害性分析)分析部件可靠性时,由于引发故障的因素会彼此影响,且专家评判带有较强主观性等问题,很难综合各种复杂因素得到定量结果。针对该问题,文中首先对飞行操纵系统典型部件——方向舵配平作动器进行硬件FMECA,基于分析结果且运用模糊FMECA方法,通过咨询专家得到单因素评价集、采用层次分析法得到权重集等步骤,最终求解得到危害度,减小了分析过程中的主观影响,使评判结果定量化。实例表明,得到的各故障模式危害度大小排序与实际吻合。由此可见,该方法在改进可靠性方面可以提供参考。

Reliability Analysis of Typical Components of Civil Aircraft

When using FMECA method to analyze the reliability of components,it is difficult to synthesize various complex factors to obtain quantitative results for the reason that the factors causing the failure will affect each other and the expert evaluation has strong subjectivity.Aiming at this problem,this paper firstly carries out hardware FMECA for rudder trim actuator,which is a typical component of flight control system.Based on the analysis results and using the fuzzy FMECA method,the single factor evaluation set is obtained by consulting experts,and the weight set is obtained by analytic hierarchy process.The hazard degree is finally solved,which reduces the subjective influence in the analysis process and makes the evaluation result quantitative.The example shows that the ranking of hazard degree of each failure mode is consistent with the actual situation.It can be seen that this method can provide reference for improving reliability.