自行車前叉之模型驗證與彎曲試驗模擬分析

Model Verification and Simulation Analysis of Bending Test for the Fork of Bicycle

王栢村(Bor-Tsuen Wang) ； 謝宗廷(Tsung-Ting Hsieh) ； 曾國睿(Kuo-Jui Tseng)

《機械技師學刊》 4卷1期 (2011/03) Pp. 20-25

https://doi.org/10.6208/JPME-2011-01-05

摘要

本文主要結合有限元素分析及實驗模態分析，對於自行車前叉進行模型驗證，以獲得等效於實際結構之分析模型，再以等效模型進行響應預測，以了解自行車前叉受力後變形與強度。首先應用有限元素分析，求得自行車前叉之理論自然頻率、模態振型，再由實驗模態分析求得實際結構之自然頻率、阻尼比、模態振型，藉由實驗與理論的參數進行比對，確認實際結構之材料性質，並套用於有限元素模型，完成模型驗證。參考歐盟EN14764城市與旅行自行車試驗規範之靜態彎曲試驗，對結構進行響應預測，透過預測結果判斷前叉結構是否符合規範。因此，本文建立設計變更的模型驗證與響應預測之前置作業流程，在未來可直接應用進行結構設計變更。

關鍵字

自行車前叉 ； 有限元素分析 ； 實驗模態分析 ； 響應預測

並列摘要

This work integrates finite element analysis (FEA) and experimental modal analysis (EMA) techniques to perform modal verification on the front fork of bicycle. The analytical modal of the front fork can be validated, and the verified equivalent modal is then used for response prediction to evaluate structural deformation and stiffness. The FEA is first performed to obtain natural frequencies and mode shapes of the front fork. The EMA is then carried out for the front fork to determine structural natural frequencies, modal damping ratios and mode shapes. By the comparison of modal parameters obtained from FEA and EMA, the structural material constants can be updated to get the equivalent FE modal via modal verification process. The EN14764 standard, i.e. the safety requirements and test methods for city trekking bicycles, is referred to conduct response prediction for the static bending test of the front fork. The predicted results are used to evaluate the strength and safety of the front fork. This paper addressed the design modification procedures, is particular for modal verification and response prediction, That can be adopted for structural modification as well.

並列關鍵字

the Fork of Bicycle ； FEA ； EMA ； Response Prediction