基于动力学模型的三轴汽车仿真系统研究

摘要

Based on multi-rigid-body dynamics with consideration of the K&C characteristics of suspension, a 26-DOF nonlinear dynamics model for three-axle heavy truck with dual tires in middle and rear axles is established by applying D'Alemberts principle. By using iteration algorithm for solving differential equations, a program of three-axle vehicle simulation system is developed with Matlab, and a comparative simulation is conducted on the model built and Adams and TruckSim models. The results show that the simulation system of three-axle vehicle es-tablished based on dynamic model has higher arithmetic speed while ensuring high accuracy, not only enhancing the development efficiency and reducing the development risk of three-axle vehicle, but also providing references for the dynamics software development of three-axle vehicles.%以多刚体系统动力学为基础,考虑悬架K&C特性,应用达朗贝尔惯性力原理,建立中后桥双胎三轴重型载货汽车26自由度非线性动力学模型.采用迭代算法求解微分方程,利用Matlab编制了三轴汽车仿真系统的程序,并基于样车数据与Adams和TruckSim进行对比仿真.结果表明,在Matlab中创建的基于动力学模型的三轴汽车仿真系统,在保证高仿真精度的同时,也具有较高的运算速度,不仅能提高三轴汽车的研发效率,减少开发风险,且对于三轴汽车动力学软件的开发具有一定的借鉴意义.