- 學位論文
電腦機箱衝擊模擬與測試分析
The Computer Chassis Shock Simulation and Testing Analysis
摘要
本研究對PC電腦機箱進行衝擊分析及測試驗証，由於衝擊時間十分短暫，要去了解其受衝擊時反應十分不易，研究中採用兩種方式—有限元素模擬分析與衝擊試驗驗証，探討機箱衝擊時之動態行為，藉由數值模擬與實驗兩者相互印証，以對結構設計提出適切改善。 為了使機箱設計時能達到在模具開發製作前就加以評估的目的，研究中使用有限元素軟體Pro/Mechanica對電腦機箱進行模態分析、3G模擬及動態衝擊分析，預測電腦機箱衝擊時整體的力學行為，並與實驗結果比較，進行分析模型修正；隨後電腦機箱進行設計改善，建立電腦機箱設計的分析評估方式。 衝擊試驗是了解產品能承受多大衝擊的指標，能承受的衝擊值愈大，產品的可靠度愈高，研究中對產品進行不同方向衝擊，探討所造成的衝擊響應，藉由衝擊試驗找出產品結構上的弱點進行改善，進而提高產品的可靠度。試驗結果不僅可以了解電腦機箱可能發生的變形，並驗證有限元素分析模式的合理性。由有限元素分析過程中，靜態模擬與實驗測試發現有10%~15%的誤差以及發現PC機箱前面板及後面EMI連接部份等，受衝擊時有高應力區現象，和試驗結果變形發生的地方吻合，進而以有限元素分析對此進行設計改善，消除原先高應力區現象。本文以模擬及試驗，建立了電腦機箱設計的評估方式，提出機箱設計改善方案，有效改善變形與內部模組損壞現象，使產品通過IEC法規測試。 應用本文採用之分析評估模式，以較嚴謹的預測產品之衝擊行為，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。
並列摘要
This research is centered on the shock test analysis and test examination for PC chassis. Due to extremely short duration of shock test, it is therefore quite difficult to realize the shocking response. This research is adopted with 2 methods – the finite element analysis and shock test for examination. The dynamic behaviors of chassis shock; through the finite element and experiment for truth examination, we propose the adequate design improvement for structure design. In order to satisfy the evaluation purpose for chassis to reach before tooling development. The Pro/Mechanica with the finite element is to be use dynamic analysis, 3G simulations and dynamic shock simulation for computer chassis. Will forecast that overall behavior of dynamics for the shock on the computer chassis and also compare with the experimental results to improve the model modification; thereafter, the design improvement on computer chassis to create the analysis evaluation methods for the computer chassis. The shock test is aimed to understand the maximum indicating value of shock resistance for product. The large value means that the product comes with higher reliability. Within this research, that performs various directional shocks onto products to investigate the arisen shock pulse. Through shock test, can find out the structure weakness of products for improvement and also enhance the product reliability. The experimental results not only help us to understand the possible deformation happening to chassis but also examine the reasonability for the finite element analysis. Under the process of the finite element analysis, the static simulation and experimental come with 10%~15% error and find that the front board and rear EMI (Electromagnetic Interference) linkage parts will be affected with hi-stressing zones under shock test. This result is in conformity with the experimental outcome so that further make the design improvement by means of the finite element analysis and eliminate the original hi-stressing area. This article is adopted with simulation and test to create the evaluation models for PC chassis design. We have proposed some improvement plans for chassis design and effectively improve the deformation and interior damage with the products availably pasting the requirements of IEC (International Electrotechnical Commission) specification. We adopt the analysis and evaluation methods mentioned in this research to forecast the shock behaviors more severely. It is aimed to help designers develop and pre-estimate the product strength and also improve to solve the problems with the purpose to shorten design duration and reduce cost and exalt the industry competence.