加改装飞机局部结构载荷谱实测与数据处理方法研究

Research on Load Measurement and Data Processing Method of Local Structure of Modified Aircraft

飞机在飞行试验过程中需要高度关注经过较大改装或承受特殊局部载荷的关键结构。通过对某型飞机加改装机身壁板的局部载荷实测过程进行分析,研究了载荷实测数据处理方法和关键技术问题。基于相关性分析,建立了改装部位局部应变与飞机主要飞参的关系,并结合大量起落飞参数据,扩充了局部应变实测数据。采用飞机历史数据统计和飞行实测相结合局部载荷实测方法,并进行高载外推,获得了切实反映飞机使用的实测载荷谱,为后续疲劳试验和寿命评估提供了设计输入。

During the flight test, the aircraft needs to pay high attention to the key structures which have been modified or bear special local loads. This paper discusses the local load measurement process of an aircraft with modified fuselage panel, summarizes the key technical problems, and studies the relevant data processing methods. Through the combination of aircraft history flight parameter statistics and local load measurement, the measured load and load spectrum of the modified part are obtained, which solves the problem that the measured sample is insufficient and the load spectrum is insufficiently distributed, and provides the design input for the follow-up fatigue test and life evaluation.