整车刚柔耦合模型的车身底盘载荷提取

Extraction of dynamic load of the vehicle chassis based on the rigid and flexible coupling model

为了更高效、简单地获得车身底盘连接点的动态载荷,以某SUV为研究对象,建立整车多体动力学模型。为了使提取的底盘载荷数据更准确,建立柔性体车身,并根据实测数据对模型进行修改。将试验车轮心六分力作为多体动力学模型的输入,固定车身,采用半分析法的方式提取车身底盘连接点动态载荷,为后期车身的疲劳分析提供载荷输入,并通过悬架前稳定杆中心一点的实测值与仿真值对比,发现数值吻合度较好,验证了提取动态载荷的准确性。

In order to obtain the dynamic load of the chassis’connection point more efficiently and easily,an SUV is taken as the research object.The multi-body dynamic model of the whole vehicle is worked out.In order to make the data on the chassis load more accurate,the flexible body is established,and the model is modified according to the measured data.The six-component force of the experimental wheel core is used as the input of the multi-body dynamics model.The vehicle body is fixed,and the dynamic load of the chassis’connection point is extracted by means of the semi-analytical method,so as to provide load input for the fatigue analysis on the later body.By comparing the measured and simulated values at the center of the stabilizer bar in front of the suspension,it is found that the values are in good agreement,which verifies that the extracted dynamic load is accurate.