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以一种果园立式螺旋开沟器为对象,土壤模型采用ANSYS切削仿真中最常用的MAT147材料模型,在动力学仿真软件LS-DYNA中计算开沟器在切削土壤过程中的能量变化,对得到的能量曲线求导得到功率曲线.结果表明,在基于SPH方法的土壤模型中,当刀具全部切入土壤中之后,开沟功率曲线在较小的范围内波动;保持刀具转速n和刀具参数不变,前进速度和平均功率满足斜率为2.7245的线性方程;在土壤模型有效条件下,土壤模型屈服表面推测参数Ah对于稳定切削时平均功率的影响不大;在Ah=2.59×10~(-6)、vy=0.5m/s的条件下,稳定切削平均功率为2.1611kW.
Taking an orchard vertical spiral opener as an example, the most commonly used MAT147 material model in the ANSYS cutting simulation was used as the soil model. The energy change of the opener in cutting the soil was calculated in the dynamic simulation software LS-DYNA. The obtained power curve is used to derive the power curve.The results show that in the soil model based on the SPH method, the ditching power curve fluctuates within a relatively small range when all the cutters are cut into the soil; keeping the cutter speed n and the cutter parameters Under the soil model effective condition, the parameter Ah predicted by the yield surface of soil model has little effect on the average power during steady cutting. When Ah = 2.59 × 10 ~ (-6), the linear equation with slope of 2.7245 can be obtained. ), Vy = 0.5m / s conditions, the average power of stable cutting 2.1611kW.