本研究目的在於整合CAD建模與CAE數值分析之技術，運用於全地形車 (ATV)，並探討在不同人員載重、重量配重(手、腳、臀)、騎乘方式、路面型態、行車速度、避震器參數等不同因子下對於乘坐舒適性及耐久性之影響。同時，並採用路況模擬系統(RPC)來驗證本研究所開發出CAD及CAE整合技術之準確性。 在系統動態模擬部分，使用Pro/ENGINEER軟體建立ATV車架模型，並將該模型轉入ADAMS軟體進行機構動態模擬，藉此獲得ATV車架結構在路面行駛時所受到的負荷及加速度歷程。接著，依據ISO2631-1規範所計算乘員之乘坐舒適性反應。另外，將系統動態模擬所得之負荷歷程匯入ANSYS作為負載條件，可進行車架之動態應力分析；再利用所得之應力歷程進行疲勞壽命評估，可獲知ATV車架最早產生疲勞破壞之部分及其疲勞壽命值。 在CAD及CAE整合技術的驗證上，由加速度歷程的比對可得知系統動態分析(ADAMS)與路況模擬實驗(RPC)所得之加速度均方根值的誤差為4.21%。而在動態應力分析(ANSYS)與RPC所得之應變振幅值誤差為11.58%，證實所開發出之數值模擬技術的準確性。此外，在不同因子探討上，當車速越高或路面越顛簸(即n值越高)，其乘適性以及車架耐久性越差。有人體載重時，其加速度響應較空車時小，車架耐久性亦較佳。較高的懸吊參數K值，其乘適性較差，但車架耐久性較好。騎乘方式對於加速度響應並無明顯影響，但可得知臀部的加速度均方根值大於手和腳。相信本研究所開發之CAD及CAE整合技術與其實驗數據可作為ATV車輛的新型設計或車輛改善之用。 The purpose of this study is to build a numerical simulation technology by integrating CAD modeling and CAE analysis for All-Terrain Vehicle (ATV). The effects of on-road factors such as car speed, rider’s weight, riding type, body part, road type and suspension spring constant on riding comfort and fatigue durability were investigated. Furthermore, the accuracy of numerical simulation technology was testified by a high-fidelity road simulator. Two different experiments were designed. The objective of the first experiment was to verify the accuracy of numerical simulation. The objective of the second experiment was to understand the effect of on-road factors on riding comfort and fatigue durability of ATV frame. On the development of numerical simulation technology, we employed the Pro/Engineer software to create an ATV frame and imported it into the ADAMS software for whole vehicle dynamic vibrating simulation. Then, we calculated the acceleration history and loading history. The second, we adopted the ISO 2631-1 standard to evaluate the riding comfort level. Meantime, we imported the loading history into the ANSYS software and calculated the stress history of ATV frame. Finally, we used the high cycle fatigue theory to evaluate fatigue durability. Experimental data showed that the simulated results of ADAMS and ANSYS analyses were similar to those of road simulation testing. It verified the accuracy of the present numerical simulation. Moreover, analytic results revealed that higher vehicle velocity or tossing road would lead to the inferior riding comfort and fatigue durability of ATV frame. The increase of rider’s weight resulted in better riding comfort and fatigue durability. Higher suspension spring constant would lead to poor riding comfort but it led to better fatigue durability. No significant difference of riding comfort was found in riding type. The buttock showed the highest acceleration among three body parts. We believed that these findings would be helpful to improve the vehicle design.
