臺灣大學: 應用力學研究所翁宗賢柯竑廷Ke, Hung-TingHung-TingKe2013-03-212018-06-292013-03-212018-06-292011http://ntur.lib.ntu.edu.tw//handle/246246/249836近年來由於微機電製程的快速發展與技術的成熟，越來越多機構與人員投入微感測器及微致動器的研究。加速度開關為加速度計的一種形式，當加速度達到一定限值後，即鎖定機構，並輸出訊號。以微機電製程製作的加速度開關成本低、體積小、可靠度高、可重複使用等優點，使其十分具有商業價值，且廣泛的應用於汽車工業裡的安全氣囊、撞擊紀錄器以及監控貨物於運輸途中是否受到撞擊或是摔落等。本文所設計的加速度開關主要可應用於高G值衝擊的環境中。 本文旨在設計一可承受2000G值之加速度開關，藉由CAE輔助分析軟體設計機構，並以LS-DYNA進行動態模擬分析，並藉由MIL-STD 883E衝擊規範，測試加速度開關在高G值下，鎖定機構是否可以成功運作，若有應力集中或是結構上的缺陷等問題，可立即更改設計，以在進入試製或量產前節省研發時間和成本。 經由數值模擬的結果可得知，本文所設計之加速度開關可承受2000G的衝擊，鎖定機構可成功運作，並維持於鎖定的位置，接觸元件也可成功保持接觸，且響應應力皆在材料的彈性範圍內，沒有發生破壞的情形。且由模擬結果可得知，加速度定限值在1800G至1900G之間，若衝擊加速度小於1800G，則開關尚未到達鎖定位置，接觸元件亦無法接觸，故我們可以判定當加速度高於加速度定限值時即可正常運作。The facts of rapidly deepened applications and progressive techniques of micro-electro-mechanical systems (MEMS) attract many organizations and engineers devoting to the research of microsensors and microactuators, among which microaccelerometer and microgyroscopes are successive examples. An acceleration switch is a kind of accelerometers. As the applied acceleration beyond a threshold value, the switch will latch up and output a triggering signal. The acceleration switches made by MEMS techniques possess enormous commercial benefits due to its numerous advantages, such as low cost, miniature volume, high reliability, and reusability. It can also be widely applied in many industries such as airbags, crash recorders, and monitoring the cargos during shipping. This thesis designed and numerically simulated a high-G acceleration switch subjected in high-G impact environments. In this thesis, we aimed to design an acceleration switch which could resist impact with a threshold acceleration of 2000G. The mechanism of switching was designed by CAE software package, and the dynamic response was simulated using LS-DYNA. The goal was to examine whether the acceleration switch could function well to meet the impact specification of MIL-STD 883E. If there had any faults such as stress concentration or defects of structure, the design was changed immediately to reduce the research time and the cost before trial production or mass manufacture. The results of the simulation dictate that the proposed acceleration switch can function well with the acceleration threshold of 2000G, and the latch mechanism works successfully and stays in the latched position. Besides, the contact components keep in touch, and all the components work properly without any failures. Under the impact load of 1800G, the latch mechanism cannot be latched properly, and the contact component cannot be in contact. We conclude that the proposed acceleration switch can work when the applied acceleration is beyond the acceleration threshold.3380443 bytesapplication/pdfen-US加速度開關高G值衝擊衝擊模擬acceleration switchhigh G impactimpact simulationthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/249836/1/ntu-100-R98543058-1.pdf