一种航空发动机运行可靠性评估方法

航空发动机运行过程中，可靠性评估是航空发动机可靠性评估领域的关键问题之一，而合理的评估方法能够提高可靠性分析的效率和精度，因此本文提出一种支持评估飞机任务过程中航空发动机运行可靠性的方法。结合飞行任务特点和航空发动机工作特性，以快速存取记录器信息为分析数据，考虑当前运行环境、飞机瞬时状态、发动机当前工作状态 3 类因素对运行可靠性进行分析；将随机森林算法与分层抽样法结合对数据进行拟合、预测并计算特征重要度；以 B737-800 机型一次北京—乌鲁木齐的飞行任务为例，对方法的有效性和可行性进行验证。结果表明：本文提出的可靠性评估方法解决了航空发动机运行过程中数据量大、维度高导致的数据处理困难问题。

An evaluation method of aeroengine operation reliability

Reliability evaluation during aero-engine operation is one of the key issues in the field of reliability evaluation of aero-engine, this paper proposes a method to support the evaluation of aeroengine operation reliability in the process of aircraft mission. The method is based on the characteristics of flight mission and aeroengine. Considering the current operating environment, the transient state of the aircraft, and the current working state of the engine, the quick access recorder (QAR) information is used as the analysis data to analyze the operational reliability. The proposed method combines Random Forest algorithm with stratified sampling method to fit, predict and calculate feature importance. Finally, a B737-800 flight mission from Beijing to Urumqi is taken as an example to verify the effectiveness and feasibility of the method. It solves the problem of data processing difficulty caused by large amount of data and high dimension in the process of aeroengine operation.