基于空间模型的轿车平顺性时域建模和仿真

Modeling and Simulation of Time Domain for Car Ride Comfort Based on a Space Model

基于滤波白噪声、路面各向同性假设和一阶Pade逼近方法,建立了四轮路面激励的滤波白噪声模型。基于一定假设,建立了轿车平顺性七自由度空间力学模型,由系统振动能量和拉格朗日方程推导出相应数学模型的微分方程描述,提出了相应的平顺性仿真算法,在常用的B级路面和车速60 km/h下,对某轿车平顺性进行了时域仿真,获得了振动响应量的时间历程。研究结果表明,基于空间模型对轿车平顺性进行时域建模和仿真是可行和有效的。

Based on filter white noise, road isotropous hypothesis and the first order Pade method, a filter white noise model of four wheels is built. Accoding to certain assumptions, a mechanical model of seven degrees of free-dom space is established for car ride comfort. Differential equation description of the model is derived by the system vibration energy and Lagrange equantion. The corresponding simulation algorithm is proposed and time domain sim-ulation of a car ride comfor is carried out on common grade B road and speed of 60 km/h, time history of the vibra-tion response variables are obtained. The results show that it is feasible and effective to model and simulate car ride comfort based on space model.