基于EDEM的播种机镇压轮作业质量仿真试验研究

Simulation experimental research on the operation quality of the press wheel of the seeder based on EDEM

针对播种机开沟后地面拱起土壤易产生风沙扰动的问题,从播种机镇压轮的作业质量入手,研究其作业后对地面环境的恢复效果。以圆柱形光面镇压轮为研究对象分析其平衡状态下的力学性能,基于EDEM离散元软件对镇压过程进行仿真分析,利用Design-Expert软件对作业参数进行三因素三水平的正交试验设计,通过响应面法分析了参数的交互作用对地面平整度的影响,并对参数进行了优化。试验结果显示:镇压过程中,影响地面平整度的作业参数主次顺序为镇压轮作业速度、地面拱起土壤的堆积高度;为满足作业效率需求,当开沟后地面土壤堆积高度为43 mm时,镇压轮作业速度应达到1.32 m/s,此时最佳地面平整度为93%。对于更高的作业效率需求,应结合土壤拱起形态合理提高作业速度。

Aiming at the problem that the ground arched soil is easy to produce wind and sand disturbance after the ditching of the seeder,the recovery effect of the ground environment after the operation is studied from the operation quality of the press wheel of the seeder.The mechanical properties of the cylindrical smooth pressing wheel under equilibrium state were analyzed.Based on EDEM discrete element software,the operation process of pressing wheel was simulated and analyzed.The orthogonal test design of the three-factor and three-level was carried out by using Design-Expert software.The influence of parameter interaction on ground flatness was analyzed by response surface method,and the parameters were optimized.The test results show that in the process of pressing wheel operation,the primary and secondary order of operation parameters affecting ground flatness is the operation speed of the pressing wheel and the accumulation height of the ground arched soil.To meet the demand of operating efficiency,when the height of ground soil accumulation after ditching is 43 mm,the operating speed of the press wheel should reach 1.32 m/s,and the best ground flatness is 93%.For higher operating efficiency requirements,the operating speed should be reasonably increased in combination with the soil arching morphology.