本文關(guān)鍵詞：航天用行程開(kāi)關(guān)耐力學(xué)環(huán)境設(shè)計(jì)方法研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 行程開(kāi)關(guān) 接觸系統(tǒng) 力學(xué)環(huán)境 接觸可靠性

【摘要】：行程開(kāi)關(guān)又稱(chēng)限位開(kāi)關(guān),是一種常用的小電流主令電器。其工作原理為:當(dāng)外力施加于行程開(kāi)關(guān)的按鈕時(shí),開(kāi)關(guān)內(nèi)部的結(jié)構(gòu)件通過(guò)機(jī)械傳動(dòng)使觸頭動(dòng)作進(jìn)而實(shí)現(xiàn)接通或分?jǐn)嗫刂齐娐?達(dá)到一定的控制目的。由于開(kāi)關(guān)內(nèi)部的觸點(diǎn)與觸頭為彈性接觸,因此,在振動(dòng)、沖擊、恒加速度等力學(xué)環(huán)境綜合作用下存在著接觸可靠性的問(wèn)題。接觸系統(tǒng)是行程開(kāi)關(guān)實(shí)現(xiàn)電路切換功能的核心執(zhí)行部件。接觸系統(tǒng)的固有頻率與響應(yīng)振幅特性直接影響閉合觸點(diǎn)在振動(dòng)和沖擊環(huán)境下的接觸可靠性;而接觸壓力直接影響閉合觸點(diǎn)在恒加速度環(huán)境下的接觸可靠性。研究行程開(kāi)關(guān)耐力學(xué)環(huán)境性能,可具體到研究接觸系統(tǒng)的固有頻率、響應(yīng)振幅特性和接觸壓力等問(wèn)題上,由于在動(dòng)態(tài)條件下,這些參數(shù)的變化均呈現(xiàn)為非線性規(guī)律,因此研究工作較少。文章介紹了一種常見(jiàn)的行程開(kāi)關(guān)的橋接式接觸系統(tǒng)。通過(guò)設(shè)定邊界條件將簧片物理模型簡(jiǎn)化替換為懸臂梁模型。而后,將懸臂梁模型與單自由度彈簧振子模型進(jìn)行類(lèi)比,得到在一定條件下二者振動(dòng)特性相似的結(jié)論。進(jìn)而將這種相似結(jié)論推廣到整個(gè)接觸系統(tǒng),經(jīng)進(jìn)一步等效替換,將接觸系統(tǒng)物理模型替換為并聯(lián)彈簧振子。在固有頻率保持不變的基礎(chǔ)上進(jìn)行等效替換,將接觸系統(tǒng)的非線性問(wèn)題轉(zhuǎn)化為線性問(wèn)題,并在此基礎(chǔ)上開(kāi)展模態(tài)分析:結(jié)合單自由度振動(dòng)體系固有頻率通用表達(dá)式和并聯(lián)等效原理推算出接觸系統(tǒng)的固有頻率表達(dá)式,并分別計(jì)算了簧片和接觸系統(tǒng)的固有頻率,通過(guò)有限元仿真軟件建立有限元模型進(jìn)行模態(tài)仿真,通過(guò)理論和仿真分析結(jié)果的對(duì)比驗(yàn)證了分析思路的正確性。在模態(tài)分析的基礎(chǔ)上開(kāi)展振動(dòng)、沖擊、恒加速度等力學(xué)環(huán)境作用下接觸系統(tǒng)橋接結(jié)構(gòu)的動(dòng)態(tài)特性。利用經(jīng)典力學(xué)、材料力學(xué)、振動(dòng)學(xué)相關(guān)理論,分別建立了不同力學(xué)環(huán)境下接觸系統(tǒng)的運(yùn)動(dòng)方程,分別進(jìn)行振動(dòng)諧響應(yīng),沖擊響應(yīng)和加速度應(yīng)變分析;同時(shí),利用有限元分析軟件再次驗(yàn)證了數(shù)學(xué)模型和理論分析結(jié)論的正確性;并結(jié)合兩方面分析結(jié)論提出了在復(fù)雜力學(xué)環(huán)境下確保行程開(kāi)關(guān)接觸系統(tǒng)接觸可靠性的合理判據(jù)。作為一種設(shè)計(jì)思路,文章的結(jié)論對(duì)于位置開(kāi)關(guān)類(lèi)器件內(nèi)部接觸系統(tǒng)的參數(shù)設(shè)計(jì)具有一定的參考價(jià)值,為提高有機(jī)械觸點(diǎn)的開(kāi)關(guān)電器在振動(dòng)、沖擊、恒加速度等力學(xué)環(huán)境下的接觸可靠性提供了一些的分析思路和方法。
[Abstract]:Also called the travel switch limit switch, is a small current commonly used master appliances. Its working principle is: when the external force applied to the switch button, a switch internal structure by mechanical transmission to make the contact action and get through or cut off the control circuit to control the purpose. Because of contact, contact the internal elastic contact switch and so on vibration, shock, constant acceleration and other mechanical environment under existing contact reliability problems. The contact system is the core to achieve the circuit switching function of the travel switch component. Contact the inherent frequency and amplitude response characteristics directly affect the contact reliability of closed contact in vibration and shock environment next; and the contact pressure directly affects the contact reliability of closed contact in constant acceleration environment. Research on stroke switch endurance environment performance, can be specific to the study of contact The natural frequency of the system response, amplitude characteristics and contact pressure on the dynamic condition, the changes of these parameters are presented as nonlinear rules and therefore less research. This paper introduces the bridge type contact system of a common switch. By setting the boundary conditions will be simplified as the cantilever beam model to replace reed model. Then, the cantilever beam model with single degree of freedom oscillator model by analogy, under certain conditions, the two vibration characteristics of a similar conclusion. Then the similar conclusion to the whole contact system, by further equivalent replacement, the contact system physical model replacement for parallel spring vibrator. The base remained unchanged on the equivalent substitution in the natural frequency, the system will contact nonlinear problem into a linear problem, and on this basis to carry out modal analysis with the vibration of single degree of freedom Calculate the natural frequency of contact system natural frequency expressions of general expressions and parallel equivalent principle, natural frequency and reed contact system are calculated, through the finite element simulation software to establish the finite element model of modal simulation, the comparison between theoretical analysis and simulation results verify the correctness of the analysis method. The vibration, impact on based on modal analysis, the dynamic characteristics of the bridge structure of the contact system of constant acceleration and other mechanical environment. By using classical mechanics, material mechanics, vibration theory, the equations of motion are established with mechanical environment contact system, respectively, harmonic response analysis, impulse response and acceleration at the same time, using the finite strain; element analysis software again to verify the correctness of the mathematical model and the theoretical analysis conclusion; and combined with the analysis of two aspects of conclusion put forward in the complex Ensure a reasonable criterion of travel switch contact system, the contact reliability of mechanical environment. As a kind of design idea, the conclusion has a certain reference value for the parameter design of position switch devices within the contact system, in order to improve the electrical mechanical contact switch in the vibration, impact, the contact reliability constant acceleration mechanical environment provides some analysis ideas and methods.

【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：V442

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 李存海;ME型行程開(kāi)關(guān)可靠性研究及數(shù)據(jù)分析[D];哈爾濱理工大學(xué);2017年

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本文編號(hào)：1369007