入土切割对甘蔗切割过程影响的仿真试验

采用ANSYS/LS-DYNA显式动力学仿真软件及反求技术，建立甘蔗-切割器系统仿真模型，进行甘蔗材料参数反求，获得了适用于动力学仿真的甘蔗材料模型，且进行了物理试验验证；通过建立土壤-甘蔗-切割器系统的动力学仿真模型，进行动力学仿真试验，建立相关数学模型，研究了土壤的软、硬程度及切割状态对甘蔗最大切割力及切割破头的影响，结果表明，土壤的软硬程度对甘蔗的最大切割力影响小，对甘蔗轴向剪应力影响大；甘蔗两刀切断比一刀切断的最大切割力小，甘蔗入土切割比非入土切割的最大切割力大，但轴向剪应力小，甘蔗入土一刀切断的平均轴向剪应力比非入土一刀切断的小43.3%，甘蔗入土两刀切断的轴向剪应力比非入土两刀切断的小49%，入土切割是降低甘蔗切割破头的有效途径。

Dynamic simulation experiment on effects of sugarcane cutting beneath surface soil

Sugarcane-cutter system dynamics simulation model was established and suitable material parameter model of sugarcane was obtained by using explicit dynamic simulation software ANSYS/LS-DYNA and inverse method. The precision of the simulation model was verified by physical experiment. Based on the establishment of soil-sugarcane-cutter system dynamics simulation model, dynamics simulation experiments were carried out and correlative mathematic models were built. The effects of soil soft-hard state on sugarcane maximum cutting force and broken biennial root was investigated.The results showed that the soil soft-hard state had more effective on sugarcane axial shear stress than that on sugarcane maximum cutting force.The maximum cutting force of two-blade cutting sugarcane is smaller than that of one-blade. The maximum force for cutting under the ground was larger than that for cutting over the ground,but the average axial shear stress for one-blade cutting under the ground was 43.3% less than that for cutting over the ground. Moreover, the average axial shear stress for two-blade cutting under the ground was 49% less than that for cutting over the ground. Cutting sugarcane under the ground could effectively reduce the rate of broken biennial root.