本文關(guān)鍵詞： 電連接器 跌落沖擊 動(dòng)態(tài)響應(yīng) 參數(shù)靈敏度 優(yōu)化設(shè)計(jì)　出處：《江蘇大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：宇航級(jí)電連接器的工況越來越嚴(yán)苛,性能要求也越來越高,在運(yùn)輸或使用過程中需要考慮電連接器或其附件的跌落失效形式和規(guī)律。本文以YDA型圓形電連接器為研究對(duì)象,從接觸碰撞的力學(xué)模型和產(chǎn)品對(duì)跌落沖擊的響應(yīng)出發(fā),結(jié)合數(shù)值模擬和實(shí)驗(yàn)分析,研究了該模型在跌落過程中的沖擊響應(yīng)規(guī)律。主要研究結(jié)論如下:在其他工況不變的情況下,模擬分析了圓形電連接器在100mm高度下跌落撞擊地面的整個(gè)沖擊響應(yīng)過程,研究了關(guān)鍵零件插針和殼體的沖擊應(yīng)力分布和加速度響應(yīng)規(guī)律。結(jié)果表明:插針?biāo)艿錄_擊最為嚴(yán)重,且沖擊應(yīng)力集中在軸肩頂部,最大值為176.6MPa;通過跌落沖擊試驗(yàn),測(cè)試了電連接器殼體某一位置的沖擊加速度響應(yīng),結(jié)果表明該響應(yīng)峰值與模擬結(jié)果基本吻合,誤差僅為2.5%,驗(yàn)證了跌落沖擊模擬的可靠性。在跌落姿態(tài)不變的情況下改變跌落高度,分析其沖擊響應(yīng)隨跌落高度的變化規(guī)律,結(jié)果表明隨著跌落高度的增加,峰值沖擊應(yīng)力逐漸增大,且插針的沖擊應(yīng)力增速大于殼體,并在1200mm高度時(shí)率先發(fā)生塑性變形;而沖擊加速度隨跌落高度的增加,呈加速度趨勢(shì)增長(zhǎng),且插針?biāo)軝M向沖擊加速度最為嚴(yán)重。在跌落高度不變的情況下改變跌落姿態(tài),結(jié)果發(fā)現(xiàn)角度跌落時(shí)座殼體所受沖擊應(yīng)力均大于豎直跌落,且以60°角跌落時(shí)產(chǎn)生的峰值沖擊應(yīng)力最大,而發(fā)生水平跌落時(shí)插針產(chǎn)生的峰值應(yīng)力最大;分別針對(duì)座殼體和插針的危險(xiǎn)角度進(jìn)行模擬計(jì)算,得到該圓形電連接器的臨界跌落高度約為750mm。對(duì)圓形電連接器整體模型進(jìn)行了模態(tài)分析,得到了前五階固有頻率,通過與實(shí)驗(yàn)測(cè)得的振動(dòng)頻率進(jìn)行對(duì)比,發(fā)現(xiàn)在不同跌落高度下的振動(dòng)頻率還達(dá)不到系統(tǒng)的一階固有頻率,結(jié)果表明了圓形電連接器在跌落沖擊過程中不會(huì)產(chǎn)生共振現(xiàn)象。研究了初步優(yōu)化后其結(jié)構(gòu)參數(shù)對(duì)跌落沖擊響應(yīng)的影響規(guī)律,通過靈敏度分析,發(fā)現(xiàn)插針軸肩根部圓角和軸環(huán)厚度是影響沖擊應(yīng)力的關(guān)鍵參數(shù),并對(duì)插針的關(guān)鍵參數(shù)進(jìn)行了尺寸優(yōu)化設(shè)計(jì),優(yōu)化后該電連接器的峰值沖擊應(yīng)力降低了59.7%,沖擊加速度降低了44.8%,結(jié)果表明該優(yōu)化方案大大提高了圓形電連接器的抗跌落性能。
[Abstract]:The working conditions of aerospace grade electrical connectors are becoming more and more severe, and the performance requirements are becoming higher and higher. In the process of transportation or use, we need to consider the drop failure form and rule of electrical connector or its accessories. This paper takes YDA type circular electric connector as the research object. Based on the mechanical model of contact impact and the response of products to drop impact, numerical simulation and experimental analysis are combined. The impact response of the model in the process of falling is studied. The main conclusions are as follows: under the condition of other conditions unchanged. The whole shock response process of the circular electrical connector falling into the ground at 100mm height was simulated and analyzed. The impact stress distribution and acceleration response of the pin and shell of the key parts are studied. The results show that the drop impact of the pin is the most serious and the impact stress is concentrated on the top of the shaft shoulder. The maximum value was 176.6 MPA; Through the drop impact test, the shock acceleration response of the electric connector shell at a certain position is tested. The results show that the peak value of the response is basically consistent with the simulation result, and the error is only 2.5%. The reliability of the drop impact simulation is verified. The drop height is changed under the condition of constant drop attitude, and the change rule of the impact response with the drop height is analyzed. The results show that the drop height increases with the drop height. The peak impact stress increases gradually, and the impact stress growth rate of the pin is larger than that of the shell, and plastic deformation occurs first at the height of 1200mm. The impact acceleration increases with the drop height, and the transverse impact acceleration of the pin is the most serious. The drop attitude is changed when the drop height is constant. The results show that the impact stress of the shell is greater than that of the vertical drop, and the peak impact stress is the largest when the angle is 60 擄, and the peak stress of the pin is the biggest when the horizontal drop occurs. The critical drop height of the circular electrical connector is about 750 mm. and the whole model of the circular electrical connector is analyzed. The first five natural frequencies are obtained. By comparing with the vibration frequencies measured by experiments, it is found that the first order natural frequencies of the system can not be achieved at different drop heights. The results show that circular electrical connectors do not produce resonance during drop impact. The influence of structural parameters on drop shock response is studied after preliminary optimization and sensitivity analysis is carried out. It is found that the angle of the shaft shoulder root and the thickness of the shaft ring are the key parameters affecting the impact stress, and the key parameters of the pin are optimized. After optimization, the peak impact stress and the impact acceleration are reduced by 59.7 and 44.8 respectively. The results show that the anti-drop performance of the circular electrical connector is greatly improved by the optimized scheme.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM503.5

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