本研究分別建立四分之一車與二分之一車雙A臂式懸吊數學模型,首先利用向量迴路方程式分析懸吊之幾何位置對於車身翻滾中心的影響。接著,在懸吊桿件與車身連結處加入滑塊,使懸吊機構幾何能隨滑塊滑動而改變,使其成為可變幾何懸吊,並建立此懸吊的數學模型,藉以分析滑塊之滑軸角度對於側傾中心以及輪胎前束的影響性,接著依照所建議的滑軸角度發展出一組依行駛狀態調整懸吊機構之可變幾何懸吊系統,並評估此懸吊系統能在幾何改變之後,能不影響車輛操控性,且有效的降低車身側傾角。 除此之外,在進行整車動態分析時,為了減少半車與全車模型之間的模擬誤差,因此利用運動靜力分析法(Kinetostatic analysis),藉以分析懸吊各桿件受力以及幾何改變情形,以評估荷重改變,對於車身姿態所造成的影響。最後由模擬結果得知,可變幾何懸吊系統確實能在不影響車身偏轉角速度之下,有效的降低車身側傾之現象,增加車輛操控性以及安全性。
The study establishes the mathematical models for double wishbone suspension system, when the study analyzing the vehicle dynamics, in order to reduce the simulation error about half vehicle and full vehicle, it will analyzing the state about suspension geometry and vertical load by the Kinetostatic analysis, the result shows that new geometry of suspension when the suspension support different loading. Besides, in order to achieve the controllable of roll center, a slider block is installed between upper control arm of suspension and vehicle body. This paper also analyzes how suspension linkage geometry affects the toe angle by using closure equation. Thus, the most sensitive of toe angle is found. Therefore, in order to evaluate the handling performance, a full car model with variable geometry suspension is constructed using multi-body dynamic analysis software Adams. Finally, the result shows that the roll angle of vehicle attitude can be improved by using novel variable geometry suspension.