本文主要在於探討自行車避震系統影響騎乘者之舒適性，首先定義騎乘舒適度指標，以座墊方向加速度之功率頻譜密度函數表達。自行車動態模型則由Lagrange equation 推導出，撰寫Matlab程式模擬人體騎乘自行車動態行為，探討不同車速下通過弦波路面有何差異，再比較單一避震器調整彈簧、阻尼參數對舒適性之影響，最後繪製出搭載各種避震器時的座墊加速度功率頻譜密度圖，並討論改善效果。實驗部分則選用可自由替換避震器之車體，藉實驗室所建立之自行車避震測試機台，量測自行車通過弦波路面時之座墊位移量與加速度，將實際結果與模擬結果進行比較。

Comfortable effect of a bicycle rider with variable dampers is a major concern of this study. First of all, the power spectrum density of seat acceleration was defined as the index of riding comfort. The bicycle dynamic model was derived from Lagrange’s equation. Programming to simulate a bicycle while passing through a sinusoid road in different speed and comparing with the results. Then, the comfortable effect of a bicycle rider was analyzed by adjusting spring and damping constant of single damper. Finally, plotting the diagram of power spectrum density of seat acceleration with different dampers and discussing the improvement. In experiment, a bicycle with replaceable damper was selected. Rely on the bicycle suspension tester was constructed in laboratory, measuring the seat displacement and acceleration of a bicycle while passing through a sinusoid road and comparing with the simulation results.

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