二輪車之穩定性探討

Abstract

本研究探討二輪車之動態穩定性，首先整理過去對於各類型二輪車穩定性之研究，以Lagrange能量法建立二輪車之運動方程式，並發展適用於一般常見的二輪車穩定性之研究方法。其次以定性方法研究二輪車在其常用行駛速度域可能產生之不穩定模態，並分析探討各不穩定模態之物理意義。再以定量方法調整車輛之各個設計參數，針對各種不同的二輪車，比較其動態特性，觀察不穩定模態之變化趨勢。最後，提出一最佳化方法及穩定性指標，求得較穩定之參數設定。依照本文之研究方法，可使二輪車在設計時，即能提早評估其行駛之穩定性。

The study deals with the stability of two-wheeled vehicles. Firstly, the studies of two-wheeled vehicles in the past have been reviewed and organized. The Lagrange equation of motion is used to set up the dynamic equations of motion of two-wheeled vehicles. Then, a method of investigating the stability of two-wheeled vehicles is developed for all general two-wheeled models. Secondly, a quantitative analysis is applied to the various instability modes of a two-wheeled vehicle, and also, a qualitative analysis is used to find the relationship between the adjustments of design parameters of a two-wheeled vehicle and the instability modes. Finally, an optimum method, combining both weave mode and wobble mode, is purposed to pursuit a better parameter setting for stability of a two-wheeled vehicle. Following the method of this study, the stability of two-wheeled vehicles can be improved in the early stage of design.