本文針對電子組件落下行為進行分析,以滑鼠為模型探討其結構件之位移/應力反應變化。首先由文獻資料建立一個簡單模型,經由靜態力學模擬分析使其元素大小收斂以確定參數合理正確。接續使用有限元素顯性分析法進行模擬並比對文獻中應變歷時圖形與整體歷時高速照相圖片,得到相似趨勢與相近之結果。對於落下平台組合構件之PCB板件衝擊情形,設計四因子三水準之田口法分析研究各設計因子對於結構體內部位置改變之影響。研究發現拘束方式改變使得該結構中位移/應力最為顯著,並且在以相似之拘束設計應用於整體滑鼠結構中,所得結果發現最大位移發生在有螺絲固定四端及兩側輔助肋之拘束設計,而最小位移發生在僅有輔助肋之設計。最終得到在僅有輔助肋之設計下有最小之位移/應力且仍能保持該結構不產生破裂。
This study was aimed to examine the dynamic response of drop test in view of some electrical components. The mouse was taken as the model in order to probe into the factors of structural displacement and stress response changes. This research consists of four sections as follows. First, according to the reviewed references, a simple simulate model was developed and studied by using static simulation to confirm the element sizes and parameters. The resulting strain-time graphs of simulate were compared with interval high-speed snapped photographs and those strain-time graphs of the reviewed drop test references, resulting in similar trend and outcome. Second, in an attempt to investigate the impact situation among the PCB board of the drop platform assembled components, four factors with three levels of Taguchi method was designed for exploring the importance of position differences within the structure. The restrain method within the structure was regarded as the main factor of structural displacement and stress response changes in this study. Third, similar restrain method was applied to the mouse structure, the result of which showed that the longest displacement occurred in the design of four screwed corners and two restrained ribbed sides, while the shortest displacement took place in the ribbed design. Finally, the findings of this study also showed that the ribbed design of the mouse would result in the shortest displacement and the least stress response changes; therefore, the mouse structure was apt to be maintained without possible fracture.