基于多体动力学的秸秆还田机虚拟仿真与功耗测试

Virtual Simulation and Power Test of Straw Counters-field Based on Multi-body Dynamics

针对目前秸秆还田机功耗测试难的问题,提出了利用虚拟测试平台评估还田机功耗的方法。首先建立秸秆还田机Abaqus动力学模型,并进行边界约束条件和载荷设置,分别模拟刀具在入土深度120 mm和90 mm、机具前进速度3 km/h和5 km/h、刀轴旋转速度260 r/min和230 r/min下的工况,对秸秆还田机的功率消耗进行了虚拟仿真;然后构建了田间功耗测试系统,通过对比仿真数据得知相对误差分别为9.06%和8.02%,验证了该种测试方法的准确性和可行性。最后分别选取3种入土深度、2种前进速度、3种旋转速度因素组成18种工况,对其进行了仿真分析,结果表明:入土深度一定时,秸秆还田机功耗分别和前进速度、旋转速度呈线性递增关系;在入土深度和前进速度一定时,刀轴转速存在消耗功耗最低的转速,特别是在入土深度和前进速度较大时,刀轴转速对能耗影响明显。

Aiming at the problem that the power consumption of straw counters-field is difficult to test,this paper proposes a virtual test platform evaluation counters-field set power consumption method.Firstly,the dynamic model of straw counters-field was established. The boundary conditions and loads were set up. The virtual simulation of power consumption in straw counters-field was carried out with the buried depth of 120 mm and 90 mm,forward speed of 3 km / h and 5 km / h,rotation speed of 260 r / min and 230 r / min,respectively. Then the field power test system was built and the relative errors were9. 06% and 8. 02% respectively by comparing the simulation data. The accuracy and feasibility of the proposed method were verified. Finally,18 conditions（ three buried depths,two forward speeds,and three rotating speeds） were selected to carry out the simulation. The results show that,with a certain buried depth,the straw counters-field set power consumption has an increasing linear relationship with forward speed and rotation speed. With a certain buried depth and forward speed,the lowest power consumption appeared at the rotation speed of 230 r / min. Moreover,with a larger buried depth and forward speed,the effect of rotation speed on the power consumption is obvious.