入土切割对甘蔗切割过程影响的仿真试验  

Dynamic simulation experiment on effects of sugarcane cutting beneath surface soil

作　　者：杨望[1] 杨坚[1] 刘增汉[1] 梁兆新 莫建霖 

机构地区：[1]广西大学机械工程学院,南宁530004 [2]广西农业机械研究院,南宁530001

出　　处：《农业工程学报》2011年第8期150-156,I0002,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：广西自然科学基金资助(桂科自0832028);广西科技创新能力与条件建设项目(桂科能0842006)

摘　　要：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。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.

关 键 词：甘蔗 切割 计算机模拟 土壤状态 反求 

分 类 号：S225.53[农业科学—农业机械化工程]