GO-FLOW法在飞机EHA可靠性分析中的应用

摘要

The GO-FLOW methodology is applied in the reliability analysis of aircraft electro-hydrostatic actuator (EHA).Firstly,based on the reasonable division of unit function,GO-FLOW reliability analysis model of EHA was established.In order to solve the difficult problem that GO-FLOW chart cannot contain feedback loops,Boolean algebra was used to solve the Boolean equations that describe the feedback loops.Secondly,the GO-FLOW calculation was finished and the system reliability at each time point was obtained.Thirdly,compared with the results of GO methodology,the feasibility and accuracy of GO-FLOW methodology were clearly verified.Finally,the system reliability changing rule with time was obtained through the MATLAB curve fitting so that the system can be repaired and maintained timely.The results show that the GOFLOW methodology can easily obtain the system reliability at each time point with only one operation and has more advantages than GO methodology in reducing computational complexity.%应用GO-FLOW法分析了飞机电静液作动器(EHA)的可靠性.首先在EHA单元功能合理划分的基础上,建立了EHA的GO-FLOW可靠性分析模型,采用布尔代数求解描述反馈环的布尔方程,解决了GO-FLOW图不允许存在循环的难题;其次进行了GO-FLOW运算,得到EHA系统在各时间点的可靠度;再次与GO法的结果比较,验证了GO-FLOW法的可行性和准确性;最后通过MATLAB曲线拟合,得到系统可靠度随时间的变化规律,以便及时对系统进行检修和维护.结果表明GO-FLOW法只需一次运算,就可得到系统在各时间点的可靠度,在减小计算复杂度方面较GO法有优势.