自行車模態特性與行駛於凸起路面分析

Modal Characteristics of Bicycle and Transient Response Analysis for Running on a Bump Road

王栢村 ； 陳昱成

《中華民國振動與噪音工程學會論文集》 2010 (2010/06) Pp. 229-236

https://doi.org/10.30028/CSSVANNUAL.201006.0229

摘要

自行車行駛於路面之模擬分析需要有適當之動態分析模型，本文發展一個自行車之對稱動態模型，以模擬行駛於凸起路面之分析，並探討數學模型化之假設，以能合理建構自行車數學模型，接著基於此數學模型，可據以建立自行車之有限元素模型，俾於有限元素分析軟體應用。首先分別進行自行車於自由邊界與放置於地上及有無騎乘者之模態分析，可求得並比較其振動模態特性之差異。另外，也探討自行車行駛於半正弦波凸起路面之暫態響應分析，以求得不同行進速度下之座位與輪胎位移，以及車架結構應力。結果顯示，車速愈快則系統之各項響應就愈大。本文探討自行車行駛狀況之模態分析，特別考慮了半正弦波凸起路面，也完整探討自行車之模態特性，所發展之自行車動態模型與有限元素模型，未來經實驗驗證也可應用於其他響應分析。

關鍵字

車輛動態模型 ； 模態分析 ； 暫態響應分析

並列摘要

The proper dynamic model is required for the bicycle analysis in riding conditions. This work develops a symmetric dynamic riding model for the simulation of the bicycle running on a bump road. The assumptions in modeling are described to show the reasonable approach in constructing the mathematical model. The finite element (FE) model base on the bicycle mathematical model can then be constructed for the use in FE software. First, the modal analyses on the bicycle considering both the free boundary and on the ground, respectively, are performed to obtain and compare their modal characteristics. Second, the transient response analysis of the bicycle running on the half-sine bump is also presented to determine the seat and tire displacement response as well as the frame structural stresses for different bicycle speeds. Results show the higher bicycle speed generally results in the higher response. This work presents the modeling technique for the bicycle in running condition, in particular for the half-sine bump. The modal characteristics of the bicycle can be well interpreted. The developed mathematical model and its corresponding FE model are to be verified by experiments and can then be further applied to other analysis.

並列關鍵字

vehicle dynamic model ； modal analysis ； transient response analysis