基于正交优化的微耕机旋耕刀优化组合及切土分析

Optimal Combination of Blades and Analysis of Cutting Soil Based on Orthogonal Optimization

针对微耕机耕作效果受旋耕刀的折弯角度及不同折弯件旋耕刀间匹配组合的影响,对两种作业旋耕刀角度及其匹配关系进行正交分析,并且基于有限元法对其旋耕刀及旋耕刀辊进行有限元分析,得出I号旋耕刀和II号旋耕刀的最佳角度及旋耕刀棍最佳角度匹配关系,即当I号旋耕刀和II号旋耕刀弯折角都为90°时,旋耕刀的应力最小,组合旋耕刀辊力学效果最佳。利用Workbench对最优组合旋耕刀辊进行切削土壤运动学、动力学仿真分析,得出土壤粒子运动学结果、等效应力图、功耗及力矩云图,根据仿真分析结果验证正交优化是可行的。

In view of the influence of the bending angle of the rotary blade and the matching combination of the different bending parts,the orthogonal analysis of the rotary blade angle and its matching relationship is carried out in this paper.Based on the finite element method,the finite element analysis is carried out on the rotary blade and the rotary blade stick,and the optimal angle and the best matching angle of rotary blades are obtained.The matching relationship is that when the bending angle between No.1 rotary tiller and No.II rotary tiller are both 90°,the stress of rotary blade is the minimum and the mechanical effect of the combined rotary blade roller is the best.The kinematics and dynamics simulation analysis of the optimal combination rotary tiller roller is carried out by using workbench.The kinematic results of soil particles,equivalent stress diagram,power consumption and torque nephogram are obtained.According to the simulation results,the orthogonal optimization is proved to be feasible.