RANDOM VIBRATION FATIGUE ANALYSIS FOR AN AIRBORNE MODULE

GUAN Di; FAN XueLing; XIAO Bin; LIU Jie

doi:10.16579/j.issn.1001.9669.2019.01.012

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RANDOM VIBRATION FATIGUE ANALYSIS FOR AN AIRBORNE MODULE

更新时间：2022-09-22

- RANDOM VIBRATION FATIGUE ANALYSIS FOR AN AIRBORNE MODULE
- Journal of Mechanical Strength Vol. 41, Issue 1, Pages: 66-71(2019)
- 作者机构：
  
  1. 中国电子科技集团公司第二十九研究所
  2. 西安交通大学机械结构强度与振动国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2019.01.012
  CLC：
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GUAN Di, FAN XueLing, XIAO Bin, et al. RANDOM VIBRATION FATIGUE ANALYSIS FOR AN AIRBORNE MODULE. [J]. 41(1):66-71(2019)
DOI：

GUAN Di, FAN XueLing, XIAO Bin, et al. RANDOM VIBRATION FATIGUE ANALYSIS FOR AN AIRBORNE MODULE. [J]. 41(1):66-71(2019) DOI： 10.16579/j.issn.1001.9669.2019.01.012.

摘要

为研究随机振动条件下某型机载模块的疲劳特性,推导了功率谱密度下结构振动疲劳寿命的一般表达式,并利用高斯三区间法对其进行了简化,同时考虑了振动试验中随机信号削波处理对应力幅值概率分布的影响。随后通过有限元仿真,分析了结构振动疲劳破坏与模态振型的关系,获得了给定振动条件下疲劳危险位置的动态响应,最终给出了模块的振动疲劳寿命。计算得到的机载模块疲劳寿命和失效位置与耐久试验结果符合较好。

Abstract

In order to investigate the fatigue characteristics of an airborne module under random vibration loading,the general expression of structural vibration fatigue life is derived,based on the power spectral density function,which is simplified by Gaussian three interval method,the effect of random signal clipping in vibration test on stress amplitude probability distribution is also considered. Then,we analyze the relationship between the structural vibration fatigue damage and vibration modal which can be used to obtain the dynamic response of the crucial fatigue point under the given vibration loading. Finally,the vibration fatigue life of the module is given. It is shown that the numerical results coincide well with the experimental data.

关键词

随机振动功率谱密度振动疲劳寿命高斯三区间法动态响应耐久试验

Keywords

Random vibrationPower spectral densityVibration fatigue lifeGaussian three interval methodDynamic respondDurability test

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