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研究生:涂峻榮
研究生(外文):Chun-Jung Tu
論文名稱:隨身碟之落下衝擊分析與最佳化設計
論文名稱(外文):Analysis of Drop Impact and Optimal Design for Flash Drives
指導教授:黃元茂
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:機械工程學研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:88
中文關鍵詞:落下衝擊有限元素法田口法最佳化加速度
外文關鍵詞:drop impactfinite element methodTaguchi methodoptimizationacceleration
相關次數:
  • 被引用被引用:3
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  • 收藏至我的研究室書目清單書目收藏:0
隨身碟的落下衝擊分析為一高度非線性的動力學問題。本文結合有限元素法與直接積分法理論,利用軟體分析隨身碟的落下衝擊行為。加速度為電子產品重要元件的破壞判斷準則,以CNS的測試規範作為參考,本文研究隨身碟在不同落下方向與不同結構參數下,模型的加速度與應力分布情況。
最後將加速度計算數據代入田口最佳化法,以降低結構所受之衝擊加速度為目標,對隨身碟進行結構最佳化分析,並得到最佳化的設計參數組合。結果所受的衝擊加速度較原始設計降低了16 。此外由應力分析可知,使隨身碟產生最大應力值的落下方向為E3,但此值並不會造成材料的破壞。
本文之分析以CAE技術結合最佳化方法,可提供其他產品作為研究方法,並能有效降低設計成本。
This study analyzes the drop impact of a flash drive that is a highly non-linear dynamic problem. The finite element method, the direct integration method and software are used for the analysis. Acceleration that is used to judge the failure of a flash drive, referred to the CNS test standard, the accelerations and the stress distribution of a flash drive in different drop directions, and the influence of different structural parameters are studied.
Taguchi optimal method is used with calculation data. Minimizing the acceleration of a flash drive due to drop impact, the structure of flash drive with optimal combination of parameters is optimized. The impact acceleration is reduced 16% compared with the current design. Based on the stress analysis, the drop direction of maximum stress is E3, but the stress value will not cause the destruction of the material.
This study proposes the combination of the CAE method and Taguchi optimal method and offers a designing method for other products to reduce the design cost effectively.
口試委員會審定書 i
誌謝 ii
中文摘要 iii
英文摘要 iv
目錄 v
圖目錄 viii
表目錄 xi
符號表 xii

第一章 導論 1
1.1 研究動機 1
1.2 文獻探討 5
1.3 研究目的 9
1.4 研究方法 10
1.5 本文架構 11

第二章 理論基礎 13
2.1 以解析方法求解落下衝擊動力學問題 13
2.2 以數值方法求解落下衝擊動力學問題 16
2.2.1 有限元素法簡述 17
2.2.2 以有限元素法求解動力學問題 17
2.3 直接積分法 19
2.3.1 隱性求解法 19
2.3.2 顯性求解法 21
2.3.3 隱性求解法與顯性求解法的比較 22
2.4 田口法理論 23
2.4.1 品質特性與S/N比 25
2.4.2 田口直交表 27
2.4.3 平均數分析 27
2.4.4 變異數分析 28
2.4.5 確認實驗 30


第三章 有限元素軟體分析 31
3.1 有限元素分析流程 31
3.2 隨身碟幾何模型 31
3.3 前處理設定 33
3.3.1 元素劃分 33
3.3.2 材料設定 35
3.3.3 元素屬性設定 36
3.3.4 接觸方式設定 36
3.3.5 邊界條件設定 37
3.3.6 資料輸出設定 39
3.4 求解設定 39
3.5 後處理設定 40
3.6 落下衝擊實驗 41
3.6.1 落下衝擊實驗方法 42
3.6.2 實驗設備 43
3.6.3 實驗結果與模擬結果比較 47

第四章 落下衝擊行為之數值模擬 49
4.1 不同落下方向之加速度模擬結果 49
4.2 不同材料密度之加速度模擬結果 57
4.3 不同材料彈性模數之加速度模擬結果 58
4.4 不同外殼厚度之加速度模擬結果 59
4.5 不同定位肋之加速度模擬結果 60
4.5 不同落下方向之應力模擬結果 62

第五章 田口最佳化分析 69
5.1 問題分析 69
5.2 直交表分析 70
5.3 平均數分析 72
5.4 變異數分析 74
5.5 確認實驗 74

第六章 結果討論 75
6.1 解析方法之結果討論 75
6.2 解析解與數值解的比較 76
6.3 數值分析之結果討論 78
6.3.1 加速度分析 78
6.3.2 應力分析 80
6.4 最佳化之結果討論 80

第七章 結論與建議 84
7.1 結論 84
7.2 建議 85

參考文獻 86
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