汽车悬架能馈装置运动学仿真分析

Kinematics Simulation and Analysis of the Energy-Regenerative Devices for the Vehicle Suspension System

为提高传统能馈装置的能量转换效率,简化结构,增加支撑刚度,提出一种采用并联机构的新型能馈装置,汽车悬架的随机振动可以通过馈能装置将车身的垂直运动转化为电机的旋转运动。首先,根据汽车动力学建立馈能悬架振动模型,并利用旋量理论分析能馈装置的运动学特性。然后,然后利用位姿坐标变换建立雅克比矩阵,根据正逆位置和速度分析结果得到其刚度矩阵的数学模型,并定义刚度评价指标的拉格朗日函数。最后,仿真结果表明,新型能馈装置可以实现运动的转化,且结构简单,灵敏度高,也为馈能悬架的研究提供给了参考。

Aiming at resolving the low efficiency, simplifying the structure and increasing the support rigidity of the traditional energy-regenerative suspension, a novel lower-mobility parallel mechanism model is designed, which can be converted the vertical motion from the vehicle suspension into rotary motion. Firstly, based on the vehicle sys- tem dynamics theory, an energy-regenerative suspension model is built. The kinematics of the energy-regenerative devices is analyzed based on the screw theory. Subsequently, the Jacobian matrix of the parallel mechanism is formu- lated by using the pose coordinate transformation method. And the stiffness matrix of the mathematical model is ob- tained according to the results of the forward and reverse positive and the velocity. Then the evaluation index of the stiffness matrix is defined on Lagrangian＇ s. Finally, the simulation results show that the energy-regenerative device can achieve the conversion motion owing to its simple structure and highly sensitivity.