基于FEM-SPH耦合算法的土壤切削仿真研究  

Simulation Research of Soil Cutting Based on FEM- SPH Method

作　　者：朱超[1] 朱留宪[1] 黄成[2] 

机构地区：[1]四川工程职业技术学院机电工程系,四川德阳618000 [2]四川工程职业技术学院计算机科学系,四川德阳618000

出　　处：《农机化研究》2015年第9期54-58,共5页Journal of Agricultural Mechanization Research

基　　金：国家自然科学基金项目(31271610);教育部留学回国人员科研启动基金项目(教外司留[2013]1792号);中央高校基本科研业务费专项(XDJK2014C033)

摘　　要：建立了旋耕刀和土壤的FEM-SPH耦合仿真模型,基于FEM-SPH耦合算法,采用MAT147土壤材料和国家标准Ⅲ型旋耕刀,结合LS-DYNA971求解器,对土壤切削仿真进行了研究。对旋耕刀切削土壤的耕作过程进行了数值仿真模拟分析,得到了切削力和切土能耗随时间的变化曲线;计算出旋耕刀单刀切土扭矩为8.75N·m,与试验结果接近。通过正交试验分析,耕作深度为主导因子,对切土功率影响较大,调整耕作深度可有效降低土壤切削的功耗,提高耕作效率。研究表明:FEM-SPH耦合算法可有效应用于土壤切削仿真,可为研究土壤的破碎机理和耕作器具的优化设计提供理论依据。Simulation model of FEM-SPH coupling has been created ,Using MAT147 material of soil and Ⅲtype rotary blade of the national standard , combined with LS-DYNA971 solver , the simulation research of soil cutting has been con-ducted based on FEM-SPH method .The process of cutting soil of the rotary blade was analyzed , and the cutting resist-ance and the power curve were obtained .Calculating out the torque value of rotary blade is 8.75Nm, which is closed to test result .By means of orthogonal design , cutting soil power was analyzed in different factors conditions .The result shows that tillage depth is dominant factor , which has great influence on cutting soil power , by adjusting tillage depth can effectively decrease cutting soil power consumption and increase tillage efficiency .The result of research shows that , FEM-SPH method can be effectively applied in simulation of soil cutting , which is consistent with the process of practical work, reliability of the simulation was verified .Therefore, this research provides theoretical basis for study of fracture mechanism of soil and optimization design of tillage implement .

关 键 词：土壤 切削 仿真 FEM—SPH 

分 类 号：S222.3[农业科学—农业机械化工程]