综合环境应力下航空电连接器电接触特性的实验研究

发布时间：2018-03-28 03:11

  本文选题：电连接器　切入点：电接触特性　出处：《哈尔滨工业大学》2015年硕士论文

【摘要】：高温、振动环境应力是导致航空电连接器电接触失效的主要诱因。本文以航空发动机成附件电连接器为研究对象,开发航空电连接器综合环境应力电接触特性实验系统,同时加载温度环境应力和振动环境应力,实时监测电连接器的接触电阻变化情况,研究了振动频率、幅值、加速度、电流、环境温度等综合环境应力对电连接器电接触特性的影响规律,结合结构动力学模型和有限元模型,确定了电连接器接触电阻波动的物理机理。首先,设计机械夹持机构连接电连接器和电动振动台,确定振动环境应力的实验条件;设计恒温箱加载高温环境温度应力;设计四线法电路,实时采集接触电阻数据;编写上位机软件实现接触电阻的采集、显示、存储和处理过程;从而完成电连接器电接触特性测试系统的研制,实现了振动、温度和电流应力等实验参数的控制和加载。然后,实验研究了振动环境应力对电连接器接触电阻的影响规律。实验研究了不同频率、振幅等振动条件下接触电阻的变化规律和特征,研究了电连接器安装方式对接触电阻波动的影响。确定了电连接器的激振位移传递路径,建立了电连接器的结构动力学模型,分析了振动环境应力对电连接器接触电阻波动的影响规律。其次,实验研究了环境温度应力、电流应力对电连接器接触电阻的影响规律。详细研究了环境温升—接触电阻—电连接器温升的一般规律,结合有限元模型,确定了电阻率对电连接器影响明确。研究了电流应力—接触电阻—电连接器温升的一般规律,电流应力本身和由之而来的温升共同作用于电连接器,是电流应力下接触电阻呈现规律的主因。最后,研究了温度、振动综合环境应力对电连接器接触电阻的影响规律。实验确定了100℃接触电阻的波动最为剧烈的结论,得到了振动使接触面摩擦系数下降的结论。总结归纳了综合环境应力下,影响电连接器电接触特性的主因。本课题的成果可直接应用于航空、航天用电连接器及电线电缆的可靠性试验和可靠性分析过程中,由此带来的经济价值显著。
[Abstract]:The high temperature and vibration environment stress are the main inducements that cause the electrical contact failure of the aero-electric connector. In this paper, an experimental system for the comprehensive environmental stress-electric contact characteristics of the aero-electric connector is developed, taking the attached electrical connector of the aero-engine as the research object. At the same time, the temperature environmental stress and the vibration environment stress are loaded to monitor the contact resistance of the electrical connector in real time. The vibration frequency, amplitude, acceleration and current are studied. The influence of ambient temperature and other environmental stresses on the electrical contact characteristics of electrical connectors is studied. The physical mechanism of contact resistance fluctuation of electrical connectors is determined by combining the structural dynamics model and finite element model. The mechanical clamping mechanism is designed to connect the electrical connector and the electric shaking table to determine the experimental conditions of the vibration environment stress; to design the thermostat to load the temperature stress in the high temperature environment; to design the four-wire circuit to collect the contact resistance data in real time; The upper computer software is written to collect, display, store and process the contact resistance. Thus, the development of the electrical connector electrical contact characteristic test system is completed, and the control and loading of the experimental parameters such as vibration, temperature and current stress are realized. The influence of vibration environment stress on contact resistance of electrical connectors is studied experimentally. The variation and characteristics of contact resistance under different vibration frequencies and amplitudes are studied experimentally. The influence of installation mode of electrical connector on the fluctuation of contact resistance is studied. The displacement transfer path of the electric connector is determined, and the structural dynamic model of the electrical connector is established. The influence of vibration environmental stress on the contact resistance fluctuation of electrical connectors is analyzed. Secondly, the ambient temperature stress is experimentally studied. The influence of current stress on contact resistance of electrical connectors. The general law of temperature rise in environment, contact resistance and temperature rise of electric connectors are studied in detail, and the finite element model is used to study the effect of current stress on contact resistance of electrical connectors. The effects of resistivity on electrical connectors are determined. The general law of temperature rise of current stress-contact resistance-electric connectors is studied. The current stress itself and the temperature rise from the current stress itself act on the electrical connectors. It is the main cause of the contact resistance under current stress. Finally, the influence of temperature and vibration environment stress on the contact resistance of electrical connector is studied. The conclusion that the contact resistance fluctuates most violently at 100 鈩，

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