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以常发CF700型拖拉机为研究对象,基于MATLAB/SIMULINK为研究平台,选用布置空气弹簧的剪式座椅悬架和前桥空气悬架,建立拖拉机系统的四自由度平面振动模型。通过仿真分析得到,拖拉机机身质心垂向加速度均方根值、俯仰角方向加速度均方根值、座椅垂向加速度均方根值以及前轮胎动载荷均方根值较无悬架拖拉机系统分别下降了16.92%、36.82%、32.71%和20.57%。在GB/T 10910-2004规定的100 m较平滑跑道上对样机进行振动测试并与同等条件下的仿真结果对比,结果表明平均误差率为11.37%,在可接受的范围内,仿真结果可以真实反映拖拉机的振动趋势。
Taking the conventional CF700 tractor as the research object and the MATLAB / SIMULINK as the research platform, a 4-DOF planar vibration model of the tractor system is established based on the scissor-type seat suspension with air springs and the air suspension of the front axle. Through the simulation analysis, the root mean square value of the vertical center of mass of the tractor fuselage, the root mean square of the acceleration in the pitch angle, the root mean square of the vertical acceleration of the seat and the root mean square value of the dynamic load of the front tire are higher than those of the non-suspension tractor system Decreased by 16.92%, 36.82%, 32.71% and 20.57% respectively. The vibration test of the prototype is carried out on the 100 m smoother runway specified in GB / T 10910-2004 and compared with the simulation results under the same conditions. The result shows that the average error rate is 11.37%, and the simulation results are within the acceptable range Reflects the tractor vibration trend.