本文提出一種簡化有限元素模型模式來研究車燈整體及局部之振動行為，此有限元素模型可作為車燈前端設計的規格分析資料。本研究使用有限元素分析對車燈進行共振模態與頻率響應分析，再利用電磁振動機對實燈做正弦掃描振動測試，找出其動態特性，並對實驗與有限元素分析進行驗證；對於車燈模型建構採取小導角與花紋取消以及非結構類組合零件省略等模型簡化原則，並藉由調整有限元素模型邊界條件及網格與實驗激振頻譜進行驗證；結果顯示，有限元素模型調整的訣竅為車體對板件之固定點選擇與設計、整體燈各零件的組合對應力分配影響，以此可規劃出等效有限元素網格模型；而在模型網格數規劃，由不同燈種模擬數據歸納出，一百萬網格數是一個兼顧準確度跟運算效率的選項。
本研究亦進行車燈在實車與治具安裝方式上響應測試比較與設計改善，研究結果顯示，作有限元素頻率響應模擬時，車燈不連接治具，直接使用車燈模組，模擬後結構耐久更接近實際振動測試結果。透過分析本研究車燈模擬響應結果，發現運算時若使用直接積分法，相較於模態法，對網格劃分不良的模型，會有運算失真的可能性，故反之可將其運用於網格完整模型，節省處理跟模擬運算時間，以降低設計成本。

Optical mechanisms must possess static and dynamic stability to maintain relative positions between optical components and to ensure the image qualities of optical systems. Based on finite element analyses, this study applies modal analyses to improve the rigidity of an opto-mechanical structure. Firstly, a swept sine vibration test is performed to study the dynamic characteristics and natural frequencies of the opto-mechanical structure. Then, a reliable finite element model is built, based on which finite element modal analyses are performed to improve design parameters. Finite element modal analyses of the main structure are performed to improve their rigidity, respectively. Finally, feasible solutions are proposed to attain an increased natural frequency and improved rigidity.

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