中国机械工程

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航空电连接器热循环试验与寿命预测

骆燕燕1;马旋1;李晓宁2;王振3   

  1. 1.河北工业大学电气工程学院,天津, 300130
    2.中铁电气工业有限公司,保定, 071051
    3.北京航天万源科技公司,北京, 100176
  • 出版日期:2018-02-10 发布日期:2018-02-02
  • 基金资助:
    国家自然科学基资助金项目(51107028);
    河北省高等学校创新团队领军人才培育计划资助项目(LJRC003)
    National Natural Science Foundation of China (No. 51107028)

Thermal Cycling Test and Life Prediction of Aviation Electrical Connectors

LUO Yanyan1;MA Xuan1;LI Xiaoning2;WANG Zhen3   

  1. 1.School of Electrical Engineering, Hebei University of Technology, Tianjin,300130
    2.China Railway Electric Industries Co.,Ltd., Baoding, Hebei,071051
    3.Beijing Aerospace Wanyuan Science & Technology Corporation, Beijing,100176
  • Online:2018-02-10 Published:2018-02-02
  • Supported by:
    National Natural Science Foundation of China (No. 51107028)

摘要: 通过加速寿命试验,研究热循环条件下航空电连接器可靠性并探索其寿命预测方法,提出了一种模拟昼夜温差影响的热循环加速试验方法(包括试验方案及电路的设计)。热循环加速试验中,将高温稳定阶段的航空电连接器插孔应变量作为其性能退化进程的主要监测参数,进行了应力松弛引发的航空电连接器性能退化规律的试验研究。理论推导了航空电连接器失效对应的应变量临界值,分别利用灰色模型预测法、时间序列法和神经网络时间序列法对航空电连接器进行了寿命预测。试验结果表明:接触件应变量随热循环次数的增加而逐渐减小,且温差越大,应变量的减小量越大,应力松弛现象越明显,性能退化越快,寿命越短。随着热循环中温差值的增大,热循环寿命近似呈指数下降。

关键词: 电连接器, 热循环试验, 寿命预测, 应变量

Abstract: Through the accelerated life tests and analyses, the reliability and life prediction method of aviation electrical connectors was studied under thermal cycling conditions. A thermal cycling accelerated test scheme for simulating diurnal temperature differences was proposed, including experiments and circuit designs. The strains of jacks in the period of stable high temperature during the tests were used as the main monitoring parameters indicating the performance degradation processes of aviation electrical connectors. The accelerated thermal cycling tests were carried out and the performance degradation laws of aviation electrical connectors induced by stress relaxation were analyzed. The critical strain values for the failure of aviation electrical connectors were derived theoretically. And the gray model, time series model and neural network based time series model were adopted in the life prediction of aviation electrical connectors under thermal cycling conditions. The results show that the strain decreases with the increases of the numbers of thermal cycles. And the larger the temperature differences, the more the strain reduction is, the more obviously the stress relaxation phenomenon shows, the faster the performance degrades and the shorter the service life is. The thermal cycling life is approximately exponential attenuation with the increases of temperature differences.

Key words: electrical connector, thermal cycling test, life prediction, strain

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