This paper concerns the modelling of the simulation structure for the torsional stiffness evaluation of a Formula SAE vehicle frame and presents some insights into the modelling of the problem using a beam-like model together with geometrical simplifications. The insights consist of presenting utilized simplifications and assessing their influence on torsional stiffness. The simulation model, consisting of the vehicle frame, suspension and testing fixture of complex shapes, requires certain simplifications to achieve a sustainable modelling and computational time while getting reasonable results. The influence of simplifications such as a linear isotropic material model for carbon-fibre and geometrical simplifications of the suspension, frame and testing fixture are discussed. The simulation model was developed in such a way to allow the easy change of cross-sections and geometry during the vehicle design process. The simulation model was also experimentally validated. A comparison of the results from the simulation and testing showed an acceptable difference (up to 10%), thus a small influence of the material and geometrical simplifications on the results of torsional stiffness is considered.

本文涉及用于SAE方程式汽车车架扭转刚度评估的仿真结构建模，并对使用梁式模型和几何简化的问题建模提供了一些见识。这些见解包括提出简化的使用方法并评估其对扭转刚度的影响。仿真模型由复杂形状的车架，悬架和测试夹具组成，需要进行某些简化，以实现可持续的建模和计算时间，同时获得合理的结果。讨论了简化的影响，例如碳纤维的线性各向同性材料模型，以及悬架，框架和测试夹具的几何简化。仿真模型的开发方式允许在车辆设计过程中轻松更改横截面和几何形状。仿真模型也经过实验验证。模拟和测试结果的比较显示出可接受的差异（最高10％），因此考虑了材料和几何简化对扭转刚度结果的较小影响。