本文選題：電連接器　切入點(diǎn)：電接觸特性　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：高溫、振動(dòng)環(huán)境應(yīng)力是導(dǎo)致航空電連接器電接觸失效的主要誘因。本文以航空發(fā)動(dòng)機(jī)成附件電連接器為研究對(duì)象,開(kāi)發(fā)航空電連接器綜合環(huán)境應(yīng)力電接觸特性實(shí)驗(yàn)系統(tǒng),同時(shí)加載溫度環(huán)境應(yīng)力和振動(dòng)環(huán)境應(yīng)力,實(shí)時(shí)監(jiān)測(cè)電連接器的接觸電阻變化情況,研究了振動(dòng)頻率、幅值、加速度、電流、環(huán)境溫度等綜合環(huán)境應(yīng)力對(duì)電連接器電接觸特性的影響規(guī)律,結(jié)合結(jié)構(gòu)動(dòng)力學(xué)模型和有限元模型,確定了電連接器接觸電阻波動(dòng)的物理機(jī)理。首先,設(shè)計(jì)機(jī)械夾持機(jī)構(gòu)連接電連接器和電動(dòng)振動(dòng)臺(tái),確定振動(dòng)環(huán)境應(yīng)力的實(shí)驗(yàn)條件;設(shè)計(jì)恒溫箱加載高溫環(huán)境溫度應(yīng)力;設(shè)計(jì)四線法電路,實(shí)時(shí)采集接觸電阻數(shù)據(jù);編寫上位機(jī)軟件實(shí)現(xiàn)接觸電阻的采集、顯示、存儲(chǔ)和處理過(guò)程;從而完成電連接器電接觸特性測(cè)試系統(tǒng)的研制,實(shí)現(xiàn)了振動(dòng)、溫度和電流應(yīng)力等實(shí)驗(yàn)參數(shù)的控制和加載。然后,實(shí)驗(yàn)研究了振動(dòng)環(huán)境應(yīng)力對(duì)電連接器接觸電阻的影響規(guī)律。實(shí)驗(yàn)研究了不同頻率、振幅等振動(dòng)條件下接觸電阻的變化規(guī)律和特征,研究了電連接器安裝方式對(duì)接觸電阻波動(dòng)的影響。確定了電連接器的激振位移傳遞路徑,建立了電連接器的結(jié)構(gòu)動(dòng)力學(xué)模型,分析了振動(dòng)環(huán)境應(yīng)力對(duì)電連接器接觸電阻波動(dòng)的影響規(guī)律。其次,實(shí)驗(yàn)研究了環(huán)境溫度應(yīng)力、電流應(yīng)力對(duì)電連接器接觸電阻的影響規(guī)律。詳細(xì)研究了環(huán)境溫升—接觸電阻—電連接器溫升的一般規(guī)律,結(jié)合有限元模型,確定了電阻率對(duì)電連接器影響明確。研究了電流應(yīng)力—接觸電阻—電連接器溫升的一般規(guī)律,電流應(yīng)力本身和由之而來(lái)的溫升共同作用于電連接器,是電流應(yīng)力下接觸電阻呈現(xiàn)規(guī)律的主因。最后,研究了溫度、振動(dòng)綜合環(huán)境應(yīng)力對(duì)電連接器接觸電阻的影響規(guī)律。實(shí)驗(yàn)確定了100℃接觸電阻的波動(dòng)最為劇烈的結(jié)論,得到了振動(dòng)使接觸面摩擦系數(shù)下降的結(jié)論�？偨Y(jié)歸納了綜合環(huán)境應(yīng)力下,影響電連接器電接觸特性的主因。本課題的成果可直接應(yīng)用于航空、航天用電連接器及電線電纜的可靠性試驗(yàn)和可靠性分析過(guò)程中,由此帶來(lái)的經(jīng)濟(jì)價(jià)值顯著。
[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，

本文編號(hào)：1674490