數位機上盒具有高精度、高單價之特點，在產品物流運送過程中，可能受到振動、衝擊、掉落等機械力，使產品造成損壞。在產品環境測試項目中，掉落測試造成的衝擊最為劇烈，本研究即以此為探討對象。研究之宗旨為使產品於設計初期，即能評估整體結構於掉落試驗下之衝擊加速度G值，研究中將以4組硬碟托架結構設計，並與實驗數據進行驗證，以建立完整的掉落試驗數值及分析模式。經本研究結果發現，硬碟托架是數位機上盒結構設計的重點。運用結構實際設計經驗，利用Pro/E CAD繪圖軟體結合有限元素法Abaqus的模擬分析，並配合落下試驗機對硬碟心軸承受加速度詳細觀察，將其結果進行相互比對，以期在有限的空間條件限制下，使得硬碟托架能達到設計預期的強度，同時賦予高的耐摔功能。應用本文採用之機構設計模式，可有效改善產品於掉落試驗中承受之衝擊加速度G值，幫助設計者於開發初期預估產品強度、發掘並改善問題，以縮短設計開發時程及降低成本，進而提高產業競爭力。Digital Set-Top Box is one of products with high precision and high unit price. It may be damaged by shock, vibration or drop during transportation. This research is aimed to study drop. The goal is make designers are able to evaluate impact of drop on the structure in early development stage. The research will use 4 groups of hard disk bracket design and experimental data to build up complete data and analysis mode of drop tests. The result found that hard disk bracket is one the most important factor of the structure design of STB. This research uses the simulation results by CAD software Pro/E and Finite Element software Abaqus to compare with the actual drop test of STB observed by drop machine to prove computer simulation technique can be a useful method in the design of hard disk bracket structure. Then we use design rules obtained by experience to modify the hard disk bracket structure. The new design has successful overcome problems happened in old design.The method of mechanical design in the article can greatly reduce damage from drop and help designers to predict product strength and dig out issues. Furthermore, it can shorten development time, lower cost, and increase competitive advantage
