悬挂装置参数对拖拉机振动特性的影响

为研究不同农具位置对悬挂农具拖拉机振动特性的影响,以东方红-LX754拖拉机和淮丰1LS-740深松机为研究对象,采用CATIA软件建立拖拉机和农具简化的几何模型以及MATLAB编写随机路面文件,并基于ADAMS软件修改轮胎参数文本和导入随机路面激励文件,构建深松机-拖拉机-路面系统的虚拟样机。通过仿真研究悬挂装置参数对拖拉机驾驶员垂向振动加速度、座椅安装处俯仰振动角加速度、拖拉机质心垂向振动加速度的影响。结果发现,内提升臂与水平方向的夹角从20°增大到70°时,驾驶员垂直振动加速度峰值从30.09 m/s~2降低到17.61 m/s~2,垂直振动峰值频率从1.36 Hz增大到2.12 Hz,座椅安装处俯仰振动角加速度峰值从11.12 rad/s降低到7.56 rad/s,拖拉机质心垂直振动加速度峰值从42.42 m/s~2降低到29.33 m/s~2。

Effects of suspension parameters on vibration characteristics of tractor

Dongfanghong-LX754 tractor and Huaifeng1LS-740 subsoiler were used to study the effects of different positions of farm tools on the vibration characteristics of tractor with suspended farm tools. CATIA software was used to establish simplified geometric model of tractor and farm tools. MATLAB was used to write random road surface file,which was imported into ADAMS to write tire property file and establish the mechanical system model of farm tool,tractor and road surface. Effects of the parameters of the suspension device on the vertical vibration acceleration of the driver,the pitch vibration angular acceleration at the seat installation and the vertical vibration acceleration of the tractor body were obtained by simulation. The results showed that when the angle between the inner lifting arm and the horizontal direction increased from 20° to 70°,the driver acceleration peak value reduced to 17.61 from 30.09 m/s2. The peak frequency of vertical vibration increased from 1.36 to 2.12 Hz. Seat installed in longitudinal vibration angular acceleration peak value reduced to 7.56 from 11.12 rad/s2. Tractor barycenter vertical vibration acceleration peak value reduced to 29.33 from 42.42 m/s2. It will provide an important reference for designing vibration damping system of tractor.