农用切割机执行机构的仿真与分析

Simulation and Analysis on Running Mechanism of Agricultural Cutter

应用ADAMS软件对切割机执行机构进行仿真与分析,得到了铰链受力曲线图。考虑运动副的间隙,用销孔和轴的间隙配合替换理想运动副,并添加碰撞接触力,分析间隙大小对刀头位移、速度、加速度的影响;考虑构件柔性对机构中典型刚性件柔性化,并分析构件的柔性对机构动力学特性的影响。结果表明:运动副间隙和构件柔性对刀头速度、加速度影响明显产生振荡现象,且柔性构件使得加速度曲线在出现振荡的基础上峰值有所下降,缓解了切削过程中由于阻力产生的冲击。适当改变间隙值大小在一定程度上可以降低铰接构件的碰撞强度,改善切割机执行机构目标点刀头的动力学响应。

The hinge force curves were obtained through the simulation and analysis of the actuator based on ADAMS.Considering the kinematic clearance,replaced the ideal kinematic pair between the pin hole and the shaft,and added crash contact force,analyzed the influence of clearance gap size on tool head displacement,speed and acceleration.The influence of the component flexibility on the dynamic characteristics of the mechanism was analyzed.Results showed that Kinematic clearance and component flexibility had the obviously oscillatory occurence on cutter head speed and acceleration.The flexible component caused the peak value of the acceleration curve to decrease on the basis of the oscillation,and the impact of the resistance during the cutting process was relieved.Changing the clearance could reduce articulated member impact strength to some extent and improve the cutting machine execution mechanism dynamic response of the target point cutter head.