- 學位論文
應用CAE於自行車把手與豎管試驗之虛擬測試
Application of CAE to Virtual Testing of Bicycle Handlebar and Stem Test
摘要
本文主旨是以有限元素分析，建立一套自行車虛擬模擬測試方法，配合歐盟自行車規範EN17466，進行模擬自行車試驗規範的測試手法，在此本文挑選自行車豎管與把手，進行虛擬測試分析探討。本文中依照歐盟測試規範探討虛擬測試之可行性，自行車手把與豎管的測試有共有六種，(1)豎管-側向彎曲測試、(2)把手與豎管組-側向彎曲測試、(3)豎管-前向彎曲測試、(4)把手對豎管-扭轉緊固測試、(5)豎管與前叉-扭轉安全測試、(6)把手與豎管-疲勞測試。本文所倡導的方向先以3D繪圖軟體建立豎管與把手之幾何模型，在搭配有限元素分析進行分析，配合歐盟測試規範內容，參考市面上自行車測試設備，先建立相對應之有限元素模型，特別注意在有限元素上設定外力負荷與邊界條件，須符合規範測試要求，並依照測試規範對豎管與把手間之變形與破壞規定。本文建立對應之靜力分析與疲勞分析，分析預期成果，假設可以提供最佳化分析作為安全性評估，做為日後設計變更之參數，可減少設計開發所耗費的時間與設計研發出符合安全性佳的自行車。
並列摘要
This work adopts finite element analysis (FEA) to establish an efficient virtual testing analytical method to simulate the testing of the handlebar and stem of a bicycle according to the EN17466 standard. The testing standard for the handlebar and stem contains six tests, i.e. (1) Handlebar-stem-lateral bending test, (2) Handlebar stem-forward bending test, (3) Handlebar and stem assembly-lateral bending test, (4) handlebar-stem-torsional security test, (5) Handlebar-stem to fork-stem-torsional security test, and (6) Handlebar and stem-fatigue tests This work first builds the 3D geometry model of handlebar and stem for the selected bicycle by CAD software. The geometry model file can then be transferred to FE software to construct the FE model for the handlebar and stem. In particular, the loading and boundary conditions must be designated and complied with the test specifications according to the standard. The static analysis is then performed to obtain the structural deformation and stress distributions so as to evaluate the safety requirement. The developed simulation technique, especially for the handlebar and stem, can be useful for structural design modification for safety concern. The optimum design modification can be effectively performed and will reduce the time and cost for the design of safety bicycles.