衝擊測試為驗證產品強度與安全的重要指標，藉由衝擊測試可預測3C電子資訊產品在一般日常使用上是否容易發生結構損壞或功能失效等問題。本論文分為兩個主題：(1) 以ANSYS/LS-DYNA有限元素分析軟體建立一套合適的電腦補助衝擊測試模擬流程，來模擬PC主機進行衝擊測試的過程。在此針對模型材質、接觸模式、網格處理與邊界條件找出完善的設定方法，並以不同的結構設定進行分析，驗證其合理性；(2) 以田口法為理論基礎，針對PC主機中結構補強的重要元件「中心支架」進行最佳化設計，使中心支架在衝擊測試時所產生的最大應力值最小化，首先選定中心支架之裝配孔的位置尺寸為控制因子，並設定其水準範圍，接著依照直交表所列出的實驗組合進行有限元素分析，最後找出可降低最大應力值之最佳設計參數。

A free-fall shock test is an essential standard for verifying the strength and the safety of an electronic device. It estimates the probability of 3C electronic products experiencing problems, including structural damage or malfunction, during typical daily usage. Two topics are discussed in this studythesis:. (1) A computer-aided shock testing simulation procedure was developed, with the finite element analysis software ANSYS/LS-DYNA, to simulate the behavior of a desktop PC under free-fall shock testing. The optimal settings for test material, contact conditions, mesh generation and boundary conditions were determined. Analysis was performed on different structural settings to verify the accuracy of the design. (2) Theory based on the Taguchi method was used in the optimal design of the center support in a PC case to minimize the maximum stress experienced by the support during a free-fall shock test. The center support is the most important component in the structure of a computer case. The location and the dimension of the assembly hole in the center support were first determined as the control factors and their levels properly configured, followed by finite element analysis of the test experiment data combination resulting from the orthogonal array. The optimal design parameters for reducing the maximum stress value were then determined.

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