懸吊轉向系統的主要功能是承載車身重量、提供較好的轉向控制、以及降低外部輸入對車身的影響。傳統的懸吊機構為被動式的懸吊系統，由一般的連桿機構與機械式彈簧組成，幾何構造是決定此類型懸吊轉向系統好壞的一個重要因素。本研究以光陽公司所出產之ATV500型沙灘車作為分析對象，探討懸吊轉向系統的幾何構造對於沙灘車整體性能的影響。首先，介紹沙灘車的背景並列出其懸吊轉向系統的相關參數，再對該系統進行運動及簡化模型分析。接著介紹沙灘車性能優劣的指標。再者，利用運動分析的結果進行幾何參數敏感度的分析及最佳化設計，以改善該系統的性能。本研究以套裝軟體ADAMS驗證其運動分析理論為可行，並將此理論基礎製作程式化介面，以利使用者進行各種分析研究。最後，以最小運動參數變化為目標函數進行最佳化設計，可有效改善此現有機構的乘適性與操控性。

The main function of a suspension steering system is to afford vehicle weight, offer suitable directional control, and isolate the vehicle body from external forces and disturbance. A traditional suspension system is a passive suspension system. It consists of a linkage mechanism and a mechanical spring. And, geometrical structure is a crucial factor which determines the performance. The purpose of this work is to analyze an existing design namely ATV 500 manufactured by KYMCO Company. Firstly the background and relative parameters of this ATV is introduced briefly. Then a kinematic and simplified model analysis for the suspension steering system is derived along with the performance index. For improving the performance, the sensitivity analysis and optimization design are discussed
based on the result of kinematic analysis. In addition, ADAMS software is used and verified that the derived kinematic analysis is feasible. The programming interface of kinematic analysis and simplified model for users is further provided. Finally, the optimization design based on the objective function of minimum change of kinematic parameters is performed. And, the result shows that the ride and handling performance are improved.

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