基于实测数据的随机振动疲劳寿命预测方法  

Method for predicting the random vibration fatigue life based on measured data

作　　者：董江 于浩 文敏[1] 张强波 郭海东[1] DONG Jiang;YU Hao;WEN Min;ZHANG Qiangbo;GUO Haidong(Chinese Flight Test Establishment,Xi’an 710089,China)

机构地区：[1]中国飞行试验研究院,西安710089

出　　处：《航天器环境工程》2022年第3期279-286,共8页Spacecraft Environment Engineering

基　　金：航空科学基金项目“高温高速旋转件表面温度传感器集成方法研究”(编号:2019ZD030006)。

摘　　要：为研究随机振动载荷下构件的疲劳特性,采用振动台对试件开展随机振动疲劳试验。通过对试件应变计改装,完成试验过程中试件应变响应载荷测量,并实现试件疲劳过程的实时监测,准确获取了试件疲劳时刻。基于实测时域数据,结合雨流计数法和线性累积损伤理论,预估3种量级下试件的随机振动疲劳寿命。预估值与试验值对比均在3倍分散带内,验证了上述随机振动疲劳寿命预测方法的可行性及有效性。后续可通过载荷数据的实测开展危险结构件的疲劳失效监测及寿命预测。In order to study the fatigue characteristics of the components under random vibration loads, the random vibration fatigue tests for the metal structure parts are carried out by using a shaking table. The stress response load of the specimen during the test are measured with the retrofitted strain gauge, and the fatigue process of the specimen is monitored in a real-time way to obtain the fatigue life accurately. Based on the measured time-domain data, and by combining the rain flow counting method with the linear cumulative damage theory, the random vibration fatigue life of the specimens under three levels is predicted. The estimated values are well within the three-fold dispersion band compared with the experimental values, which verifies the feasibility and the effectiveness of the random vibration fatigue life prediction method based on the measured time-domain data. With the method, the fatigue failure monitoring and the life prediction for structural parts in the dangerous state can be carried out through the measurement of load data.

关 键 词：随机振动 疲劳寿命预估 应变响应 时域法 累积损伤 

分 类 号：V416.2[航空宇航科学与技术—航空宇航推进理论与工程] TB115[理学—数学]