悬架运动学外特性g-g图分析法

Analysis of suspension kinematics characters with g-g method

为了从整车角度分析悬架运动学外特性,分别利用侧倾中心模型和纵倾中心模型,推导悬架垂直变形量与加速度间力学统一公式;将悬架外特性与整车纵向及侧向加速度联系起来,并用g-g图表示,分析车体俯仰侧倾产生的悬架外特性变化;提出用前束角、外倾角以及主销内倾拖距和后倾拖距来描述悬架对车辆动力学的影响.g-g分析法能够从整车角度综合分析悬架运动学外特性,并能将力学参数不同的悬架统一进行对比分析;利用某A级轿车的悬架K&C试验数据,应用该方法计算出其悬架运动学特性三维场图.

To evaluate the suspension kinematics characteristics, by using roll center model and pitch center model, the unified formula between suspension deformation and acceleration were established, and by using g - g map, the suspension characteristics with longitudinal and lateral acceleration acting on vehicle were expressed. The toe angle, camber, as well as kingpin trailers were proposed to describe the suspension that affects vehicle dynamics. The suspension kinematics characteristics can be evaluated by g - g method not only from suspension view, but from whole car view. At last, by the suspension K ＆ C data of an A-class car, the suspension kinematics in 3D field map was calculated by this method.