多种故障/维修分布的客运飞机组成单元可用性评定方法

Availability Assessment for Passenger Aircraft Subsystem with Different Lifetime and Repair-time Distribution

结合工程背景,探讨客运飞机主要组成单元故障/维修数据信息的特点及分布,研究各组成单元在不同故障/维修分布下的可用性评估方法,给出了单元可用度点估计与经典置信限。依据ATA章节将客运飞机系统与动力装置划分为19个组成单元,结合适航要求和航空公司客运飞机运营,将单元间歇式运行过程转化为连续运行过程。分别针对指数故障/指数维修分布、指数故障/伽玛维修分布、Weibull故障/伽玛维修分布、伽玛故障/伽玛维修分布型的组成单元,利用服务系数构造枢轴量,给出各组成单元可用度的点估计与置信限。依据串联可用度模型,给出系统可用度点估计。依据航空公司某机型可靠性月报与维修记录,对客运飞机各组成单元可用度进行跟踪评价,对航空公司开展以可靠性为中心的客运飞机健康运营管理提供了技术支持。

The failure and maintenance data character of passenger aircraft subsystem are discussed, as well as their distribution, according to engineering background, the availability assessment methods are studied with various lifetime and repair-time distribution, the point estimates and classical confidence limits for aircraft subsystem availability are given. The airplane is divided into 19 subsystems according to ATA chapters, and the batch-type operation process of aircraft subsystems are converted to be continuous operation process, on the basis of airplane operation and maintenance planning analysis. Point estimates and classical confidence intervals for availability are obtained through constructing pivotal statistic in term of exponential-exponential distributed subsystem, exponential-Gamma distributed subsystem, Weibull-Gamma distributed subsystem, and Gamma-Gamma distributed subsystem. System availability point estimate is given according to series system availability model. An engineering application is carried out to evaluate aircraft subsystem availability using airlines reliability report and maintenance records. This achievement provides technology support for conducting reliability-centered passenger aircraft healthy operation and management.