基于民航发动机状态数据的涡轮叶片剩余寿命评估

Remaining Useful Life Estimation Method for the Turbine Blade of a Civil Aircraft Engine Based on the QAR and Field Failure Data

针对民航发动机的特点,提出一种基于涡轮叶片外场故障数据及快速存取记录器(Quick access recorder,QAR)历史数据的涡轮叶片剩余寿命评估方法。从发动机QAR数据中提取涡轮叶片使用载荷谱,进而借助寿命损耗模型估算涡轮叶片的累积损伤量,并进一步评估涡轮叶片的剩余寿命。以涡轮叶片的蠕变损伤失效模式为例验证方法的可行性,方法可推广应用于热机械疲劳以及疲劳-蠕变交互作用失效模式下的涡轮叶片剩余寿命估计问题,为有限信息条件下外场发动机涡轮叶片的寿命评估提供了一种可行的工程方法,可为民航发动机在翼寿命评估及送修方案的制定提供决策支持。

Based on the limited information on the civil aircraft engine, a remaining useful life prediction method for the turbine blade based on the quick access recorder（QAR） history data and the field failure data is proposed. The stress and temperature spectrum of the critical location of the turbine blade is extracted from the engine QAR data using the empirical models, the cumulative damage of the blade is estimated through the life consumption model, and further the remaining useful life can be predicted. A simulation case study is carried out to validate the proposed method. Although the method is developed based on the creep damage accumulation, it might be extended to take thermal mechanical fatigue and creep-fatigue interaction into account.