CAJ | 학술논문

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8．75 N? 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。
건립료선경도화토양적FEM－SPH우합방진모형，기우FEM－SPH우합산법，채용MAT147토양재료화국가표준Ⅲ형선경도，결합LS－DYNA971구해기，대토양절삭방진진행료연구。대선경도절삭토양적경작과정진행료수치방진모의분석，득도료절삭력화절토능모수시간적변화곡선；계산출선경도단도절토뉴구위8．75 N? m，여시험결과접근。통과정교시험분석，경작심도위주도인자，대절토공솔영향교대，조정경작심도가유효강저토양절삭적공모，제고경작효솔。연구표명：FEM－SPH 우합산법가유효응용우토양절삭방진，가위연구토양적파쇄궤리화경작기구적우화설계제공이론의거。
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 .