航空发动机首翻期内故障率Weibull分布拟合

Weibull Distribution Fitting of Aeroengine Failure Rate in the First Overhaul Interval

中文关键词:  首翻期  故障率  威布尔分布  寿命  拟合  航空发动机

英文关键词:first overhaul interval  failure rate  Weibull distribution  life  fitting  aeroengine

中文摘要:

      航空发动机在1个翻修期内是先给定保证寿命，后续根据安全性、可靠性、经济性等综合评估，逐步延长保证寿命，最终 达到首次翻修期寿命。为了分析首翻期内可靠性水平变化情况，以故障率变化为切入点，给出保证寿命的时间段建议。通过确定 故障收集信息表，分析发动机首翻期内发生的发动机关联故障，并将故障信息按照一定原则进行了筛选。采用最大赋范残差方法 对样本数据进行预处理，确认无异常数据后采用基于最小二乘法原理的相关系数优化法进行Weibull分布拟合，得到首翻期内概 率密度函数曲线、故障率函数曲线、可靠度函数曲线，并根据形状参数来确定不同的故障类型（递增型、恒定型、递减型），给出保证 寿命的建议使用时间区间。结果表明：采用故障率Weibull分布拟合方法，可直观地观察首翻期内故障率趋势变化情况，并能够依 据可靠性指标，为发动机的不同延寿策略选择提供参考。

英文摘要:

      During the first overhaul interval of an aeroengine, a guaranteed life is first given, and then the guaranteed life is gradually extended based on comprehensive assessments of safety, reliability, and economy, ultimately reaching the life goal of the first overhaul interval. In order to analyze the change of reliability level during the first overhaul interval, the change of failure rate is taken as the starting point to provide suggestions for the range of guaranteed life. By determining the failure collection information table, the engine-relevant failures that occurred during the first overhaul interval were analyzed, and the failure information was screened according to specified criteria. The maximum normed residual method was used to preprocess the sample data, and after confirming no abnormal data, the correla? tion coefficient optimization method based on the least squares principle was used for Weibull distribution fitting, obtaining the probability density function curve, failure rate function curve, and reliability function curve during the first overhaul interval. Based on the shape parameters, different failure types (increasing, constant, decreasing) were determined, and the recommended range for the guaranteed life was given. The results show that the Weibull distribution fitting method can visually observe the trend of failure rate during the first overhaul interval, and provide a reference for selecting different engine life extension strategies according to reliability indicators.