本文選題：MEMS + 安全系統(tǒng)��； 參考：《北京理工大學(xué)》2014年博士論文

【摘要】：采用微機(jī)電系統(tǒng)(MEMS)技術(shù)是實(shí)現(xiàn)引信微小型化的有效途徑之一，MEMS技術(shù)應(yīng)用于引信中的一個(gè)重要方向就是MEMS安全系統(tǒng)。失效是阻礙MEMS安全系統(tǒng)實(shí)際應(yīng)用的一個(gè)關(guān)鍵問題。由于其應(yīng)用背景較為特殊，目前國內(nèi)外對(duì)MEMS安全系統(tǒng)失效研究的報(bào)道很少，也沒有建立相關(guān)的失效分析理論，因此開展MEMS安全系統(tǒng)失效研究工作，對(duì)于解決MEMS技術(shù)在引信中應(yīng)用的關(guān)鍵技術(shù)問題具有重要意義。 研究復(fù)雜力學(xué)環(huán)境中MEMS安全系統(tǒng)的失效問題，首先從分析復(fù)雜力學(xué)環(huán)境的環(huán)境載荷特點(diǎn)入手，結(jié)合MEMS的工藝特點(diǎn)、產(chǎn)品結(jié)構(gòu)特點(diǎn)、典型材料特性，分析系統(tǒng)失效模式和失效機(jī)理，進(jìn)而明確失效判據(jù)。為全面有效地分析問題，確定復(fù)雜力學(xué)環(huán)境中MEMS安全系統(tǒng)的失效模式為時(shí)序失效和功能失效，其中功能失效是由于環(huán)境過載造成器件的強(qiáng)度失效所致，而時(shí)序失效是由系統(tǒng)作用時(shí)序混亂而引發(fā)的失效。 而后針對(duì)研究對(duì)象確定可行的失效分析方法。根據(jù)MEMS安全系統(tǒng)的特性并參考對(duì)MEMS器件的失效分析方法，本文提出了采用事前分析模式思路、針對(duì)復(fù)雜力學(xué)環(huán)境中MEMS安全系統(tǒng)的失效分析方法。既利用失效樹分析法結(jié)合對(duì)已設(shè)計(jì)安全系統(tǒng)的分析結(jié)果，對(duì)系統(tǒng)進(jìn)行失效判斷。 利用建立系統(tǒng)數(shù)學(xué)模型的方法分析系統(tǒng)對(duì)復(fù)雜外力的響應(yīng)，以此考察復(fù)雜力學(xué)環(huán)境中MEMS安全系統(tǒng)的性能。根據(jù)執(zhí)行功能的不同，將MEMS安全系統(tǒng)劃不同的功能單元進(jìn)行獨(dú)立分析，通過對(duì)系統(tǒng)簡化將各單元的作用過程簡化為其內(nèi)部的關(guān)鍵器件的運(yùn)動(dòng)或形變過程，這樣系統(tǒng)的性能最終可由器件的響應(yīng)來體現(xiàn)。將關(guān)鍵器件歸類并分別建立其相應(yīng)的動(dòng)力學(xué)、運(yùn)動(dòng)學(xué)模型，以此分析其對(duì)外加環(huán)境力的響應(yīng)。 然后以20mm小口徑彈的MEMS安全系統(tǒng)為例，利用上述分析方法對(duì)其進(jìn)行復(fù)雜力學(xué)環(huán)境中的失效分析。分別建立20mm小口徑彈的MEMS安全系統(tǒng)的安全性和作用可靠性失效樹，并通過求解最小割集的方法明確其精確失效判據(jù)；根據(jù)所建模型計(jì)算勤務(wù)處理過程和引信作用過程中20mm小口徑彈的MEMS安全系統(tǒng)不同功能單元關(guān)鍵器件對(duì)外力的響應(yīng)，將結(jié)果對(duì)比失效判據(jù)對(duì)系統(tǒng)是否失效進(jìn)行判定。 最后利用ANSYS和ADAMS工程軟件分別建立20mm MEMS安全系統(tǒng)三維模型，并對(duì)其進(jìn)行復(fù)雜力學(xué)環(huán)境中的仿真實(shí)驗(yàn)，以此驗(yàn)證所建模型的正確性和該失效分析方法的可行性。
[Abstract]:It is an effective way to realize the miniaturization of fuze by using MEMS technology. MEMS safety system is one of the important directions in the application of MEMS technology in fuze. Failure is a key problem that hinders the practical application of MEMS safety systems. Because of its special application background, there are few reports on the research of MEMS safety system failure at home and abroad, and no relevant failure analysis theory has been established, so the research work of MEMS safety system failure is carried out. It is of great significance to solve the key technical problems in the application of MEMS technology in fuze. In order to study the failure of MEMS safety system in complex mechanical environment, the first step is to analyze the environmental load characteristics of complex mechanical environment and combine the process characteristics of MEMS. The characteristics of product structure, typical material, failure mode and failure mechanism of the system are analyzed, and the failure criterion is determined. In order to analyze the problem comprehensively and effectively, the failure modes of MEMS safety system in complex mechanical environment are determined as sequential failure and functional failure, among which the functional failure is caused by the failure of the device strength caused by the environmental overload. The time series failure is caused by the chaos of the system action time series, and then the feasible failure analysis method is determined for the research object. According to the characteristics of MEMS safety system and referring to the failure analysis method of MEMS devices, this paper proposes a method of failure analysis for MEMS safety system in complex mechanical environment. Both the failure tree analysis method and the analysis result of the designed safety system are used to judge the failure of the system, and the response of the system to the complex external force is analyzed by the method of establishing the system mathematical model. The performance of MEMS safety system in complex mechanical environment is investigated. According to the different executive functions, the MEMS safety system is divided into different functional units for independent analysis. By simplifying the system, the action process of each unit is simplified to the movement or deformation process of the key devices within the MEMS system. In this way, the performance of the system can be reflected by the response of the device. The key devices are classified and their corresponding dynamic and kinematic models are established to analyze their responses to external environmental forces. The above analysis method is used to analyze the failure in complex mechanical environment. The failure tree of the safety and reliability of 20mm small aperture projectile is established, and the exact failure criterion is determined by solving the minimum cut set. According to the established model, the response of key components of different functional units of 20mm small caliber projectile to external force is calculated during the process of service processing and fuze action. Finally, the 3D model of 20mm safety system is established by using ANSYS and Adams engineering software, and the simulation experiments in complex mechanical environment are carried out. The validity of the model and the feasibility of the failure analysis method are verified.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH-39

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