单机寿命监控当量损伤计算模型研究

Study on Equivalent Damage Model for Individual Aircraft Life Monitoring

本文研究了各种等损伤计算方法,推导了指数形式的等损伤计算公式对应的过载转换公式,并验证了与其他等损伤计算公式的关系。以典型飞机疲劳试验载荷谱为基础,结合各种等损伤计算公式,通过数值计算确定了基于重心过载和单机寿命监控的当量损伤计算公式及损伤指数。在此基础上,分析确定了单机寿命监控的采样率和滤波门槛值,为实施单机寿命监控提供技术支持。

A variety of equivalent damage models were compared and studied,and then constant damage conversion formulas based on constant life curves were derived.According to the fatigue load spectrum for the full scale fatigue test of an aircraft and various constant damage formulas,the equivalent damage formula and the damage exponent suitable for the aircraft were determined by massive calculation and optimization.Influences of different sample frequencies and different filtering thresholds were analyzed in detail by considering efficiency and precision,and the final sample frequency and the filtering threshold were proposed.The work provides input for further conducting individual aircraft monitoring.