试飞阶段可靠性评估方法及试验方案设计

Reliability Assessment Method and Test Scheme Design During Flight Test

提出将基于2参数威布尔分布的小子样零故障寿命试验方法用于航空发动机等高可靠性航空武器装备设计定型试飞阶段平均故障间隔时间评估以及可靠性专项试飞/地面试验设计,通过计算给出可靠性评估及试验设计系数用表;同时采用Matlab对航空发动机历史试验数据进行拟合,得到对应的形状参数;在此基础上,以某航空发动机为例对该方法工程应用的适用性和有效性进行验证。结果表明:该方法具有较强的工程应用性,可用于解决试飞阶段航空发动机等高可靠性产品可靠性评估及试验设计问题。

A zero-failure life test method for small sample component based on two-parameter Weibull distribution was proposed to solve mean time between failure assessment issues of high reliability aeronautical products such as aeroengines,also to design the flight test and ground test scheme during qualification and type approval process.The coefficients used for reliability assessment and test scheme design were calculated and the tabulations were included.Then shape parameter was derived through curve fitting analysis of aeroengine historical flight test scheme data by Matlab.At last,the applicability and validity of method was verified by reliability assessment and test scheme design of an aeroengine.The result shows that the method could apply to solving reliability assessment and test scheme design for high reliability aeronautical products.