Loosening mechanism and stress-resistance mapping relationship of electrical connector under triaxial random vibration

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 190-195.

LIU Shaojie1, QIU Yuanying1, BAI Jin1, DU Jiangong1, LI Jing1, WANG Haidong2, WANG Zhaoxi2, ZHANG Lei3

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Abstract

Under multi-axis complex vibration environment, an electrical connector structure may be loose to affect electrical contact performance of its electrical appliances and cause failure of equipment function.Here, in order to explore mechanical characteristics of electrical connector in loosening process under multi-axis random vibration environment, a model of electrical connector in missile electronic cabin was established.The change time history of contact pressure in pin’s withdrawing process during it being loose relative to pinhole was simulated under random vibration environment, and the stress evolution mechanism in loosening process of electrical connector was revealed.Through comparing stress varying trend under triaxial random vibration and that under uniaxial random vibration, according to differences of three intervals, looseness characteristics of electrical connector under triaxial vibration were compared with those under uniaxial vibration, and a triaxial vibration stress screening method for connector looseness was provided.The mapping relationship between stress and resistance of electrical connector was derived by using R.Holm expression for relation between contact resistance and contact pressure, and the monitoring of contact stress between pin and pinhole was converted into monitoring of contact resistance to solve the technical problem of dynamic stress inside pinhole being difficult to measure.

Key words

electrical connector / random vibration / contact stress / contact resistance / finite element analysis / loosening characteristics

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LIU Shaojie1, QIU Yuanying1, BAI Jin1, DU Jiangong1, LI Jing1, WANG Haidong2, . Loosening mechanism and stress-resistance mapping relationship of electrical connector under triaxial random vibration[J]. Journal of Vibration and Shock, 2021, 40(11): 190-195

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