考虑疲劳损伤的低频瞬态振动试验扫频率修正方法  

Correction Methods for Sweeping Rate In Low-Frequency Transient Vibration Test Considering Fatigue Damage

作　　者：高博[1] 张忠[1] 李志强[1] 魏龙 郭静[1] GAO Bo;ZHANG Zhong;LI Zhi-qiang;WEI Long;GUO Jing(Science and Technology on Reliability and Environmental Engineering Laboratory,Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)

机构地区：[1]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《强度与环境》2022年第5期56-63,共8页Structure & Environment Engineering

基　　金：国家自然科学基金(U20B200071)。

摘　　要：为提升低频瞬态振动环境试验的精细化水平,缓解现有正弦扫频振动试验条件制定方法中存在的疲劳损伤“过试验”问题,本文在现有低频瞬态振动试验条件制定方法基础上,引入疲劳损伤谱对试验条件进行修正,使得试验条件在满足最大预期的前提下缓解“过试验”。以航天飞行器典型圆筒结构为原型,设计典型试验件,选择典型力学环境试验数据开展了仿真及试验研究。结果表明,修正后得到的试验条件与传统试验方法相比,“过损伤”程度显著降低。从而验证了方法的正确性。In order to improve the refinement level of low-frequency transient vibration test and alleviate the "over test" problem in the existing vibration test condition formulation method, based on the existing formulation method of low-frequency transient environmental test conditions, this paper further introduces fatigue damage spectrum to modify the test conditions, which make the test conditions alleviate the "over test" on the premise of meeting the maximum expectation. In this paper, taking the typical cylindrical structure of spacecraft as the prototype, the typical test pieces are designed, and the typical mechanical environment test data are selected for simulation and experimental research.The test results show that the degree of "over damage" is reduced compared with the traditional test method. Thus, the correctness of the test condition correction method proposed in this paper is verified.

关 键 词：环境试验条件 冲击响应谱 疲劳损伤谱 低频瞬态试验 加速度响应 

分 类 号：V416.5[航空宇航科学与技术—航空宇航推进理论与工程]