Study On Tillage Resistance Of Subsoiler Based On Numerical Simulation

As an important part of conservation tillage,subsoiling technology has been widely applied to agricultural production.The production practice shows that most of the subsoiling machines have problems of large resistance and serious energy consumption.With the growing area of subsoiling,the problem has seriously affected the popularization of subsoiling technology.In order to study the influence of different working parameters of the subsoiler on the tillage resistance,a test device was developed to solve the problem of the testing of the tillage resistance.The main research contents and conclusions are as follows.The test device is modeled by SolidWorks,and its key components are analyzed by ANSYS Workbench,including static analysis,modal analysis,structural optimization analysis,etc.,to ensure that the test device can withstand the expected drag resistance and meet the requirements of the field test.The ANSYS/LS-DYNA is used to simulate the dynamic simulation of the tillage process of soil under different working parameters,and the average value of the tillage resistance in the horizontal and vertical direction is compared.The results show that the depth is deep at the shallow low velocity(when the working speed is 1.8km/h~2.7km/h,the tillage depth is 250mm~300mm),and the depth is deep.The tillage resistance of the subsoiler increased rapidly,and the tillage resistance of the deep slack shovel increased slowly at the deep and high speed(when the working speed was 2.7km/h~3.6km/h and the tillage depth was 300mm~350mm).With the help of EDEM,the discrete element model of soil with different penetration angle was established,and the interaction mechanism between deep loosening shovel and soil was explored from the micro angle of deep loosening operation.It was concluded that the tillage resistance was relatively small when the soil angle was 30 degrees.In order to verify the simulation results,field experiments were carried out by using the test device.Through the analysis of three factors and three horizontal orthogonal experiments,the main and secondary factors affecting the resistance of tillage were the following: B(cultivation depth)had the greatest influence,followed by A(working speed),and the smallest effect was C.The optimum level of horizontal resistance is B1A1C2,that is,the minimum working parameters are 250 mm,1.8km/h,and 30 degrees.The finite element simulation results are compared with the field test results.Although the simulation values are less than the field test values,but the change trend of the two is basically the same.The finite element analysis method is consistent with the result of the field experiment,and further verifies the finite element method.It is feasible and reliable to combine with field experiments.In this paper,the results of simulation and field experiment are combined to determine the factors affecting the tillage resistance and the effect of influence,so as to provide a decision basis for reducing the tillage resistance,optimizing the working parameters,improving the working efficiency and reducing the energy consumption.