基于离散元法的果园开沟刀具的仿真与试验研究
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摘要
为探究自主研制的果园立式单轴开沟机刀片数量对开沟质量及功耗的影响及刀片在作业过程中受力最大的部位,采用离散元法建立了4刀片刀具开沟过程的仿真模型,并运用转速—扭矩测量平台获得了开沟过程中刀具的真实功耗,得出仿真模型的误差为9.3%,从而验证了离散元法对刀具开沟过程进行模拟的可行性。运用该仿真模型分别对刀片数目为3和5的刀具开沟过程进行了仿真研究,结果表明:当刀片数目为3时刀具的功耗最小,刀片数目为4为时开沟效果最好。通过分析4刀片刀具工作时的受力情况,得知其在工作开始时功耗波动较大,底端刃口处始终受到较大力的作用,因而应对其进行耐磨处理。
In order to explore the influence of the number of blades on the quality and power consumption of the independently developed Vertical-Single-Shaft Ditching-Fertilizing Machine and the most stressed part of the blade during operation,the discrete element method was used to establish the simulation model of 4-blade tool ditching process. The real power consumption of the cutter during trenching process was obtained by using a rotational speed torque measurement platform,and the results showed that the error of the simulation model is 9. 3%,which proves the feasibility of DEM Simulation for tool trenching process. The simulation model was used to simulate the tool ditching process with the number of blades 3 and 5 respectively,and the results showed that the tool has the least power consumption when the number of blades is 3,and the ditching effect is the best when the number of blades is 4. By analyzing the force of the four-blade cutter,it was found that the power consumption fluctuates greatly at the beginning of the work,and the edge at the bottom end is always subjected to a greater force. Therefore,it should be wear-resistant.
In order to explore the influence of the number of blades on the quality and power consumption of the independently developed Vertical-Single-Shaft Ditching-Fertilizing Machine and the most stressed part of the blade during operation,the discrete element method was used to establish the simulation model of 4-blade tool ditching process. The real power consumption of the cutter during trenching process was obtained by using a rotational speed torque measurement platform,and the results showed that the error of the simulation model is 9. 3%,which proves the feasibility of DEM Simulation for tool trenching process. The simulation model was used to simulate the tool ditching process with the number of blades 3 and 5 respectively,and the results showed that the tool has the least power consumption when the number of blades is 3,and the ditching effect is the best when the number of blades is 4. By analyzing the force of the four-blade cutter,it was found that the power consumption fluctuates greatly at the beginning of the work,and the edge at the bottom end is always subjected to a greater force. Therefore,it should be wear-resistant.
引文
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[20]刘凡一,张舰,李博,等.基于堆积试验的小麦离散元参数分析及标定[J].农业工程学报,2016,32(12):247-253.
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[22]王攀.丘陵山区立式单轴果园开沟施肥机的研制与试验研究[D].重庆:西南大学,2017.
[23]邓佳玉,胡军,李庆达,等.基于EDEM离散元法的深松铲仿真与试验研究[J].中国农机化,2016,37(4):14-18.
[24]姜珊珊.基于离散元法的开沟器试验研究[D].长春:吉林农业大学,2014.
[2]黄玉祥,杭程光,苑梦婵,等.深松土壤扰动行为的离散元仿真与试验[J].农业机械学报,2016,47(7):80-88.
[3]徐泳,李红艳,黄文彬.耕作土壤动力学的三维离散元建模和仿真方案策划[J].农业工程学报,2003(2):34-38.
[4]史嵩,张东兴,杨丽,等.基于EDEM软件的气压组合孔式排种器充种性能模拟与验证[J].农业工程学报,2015,31(3):62-69.
[5]胡国明.颗粒系统的离散元素法分析仿真-离散元素法的工业应用与EDEM软件简介[M].武汉:武汉理工大学出版社,2010:89-91.
[6]于建群,钱立彬,于文静,等.开沟器工作阻力的离散元法仿真分析[J].农业机械学报,2009,40(6):53-57.
[7]孟杰,孟文俊.影响EDEM仿真结果的因素分析[J].机械工程与自动化,2014(6):49-51.
[8]徐泳,孙其诚,张凌,等.颗粒离散元法研究进展[J].力学进展,2003(2):251-260.
[9]方会敏,姬长英,Ahmed Ali Tagar,等.秸秆-土壤-旋耕刀系统中秸秆位移仿真分析[J].农业机械学报,2016,47(1):60-67.
[10]李博,陈军,黄玉祥.机械与土壤相互作用的离散元仿真研究进展[J].农机化研究,2015,37(1):217-222.
[11]徐佩华,黄润秋,邓辉.颗粒离散元法的颗粒碎裂研究进展[J].工程地质学报,2012,20(3):410-418.
[12]朴顺男,张青松,刘宏博,等.基于EDEM的双翼式深松铲设计与仿真试验[J].广东农业科学,2014,41(16):182-186.
[13]纪玉杰,于淼,李成华.铲式成穴器成穴性能的离散元法仿真[J].江苏大学学报:自然科学版,2014,35(1):40-43,86.
[14]方会敏,姬长英,Farman Ali Chandio,等.基于离散元法的旋耕过程土壤运动行为分析[J].农业机械学报,2016,47(3):22-28.
[15]王燕.基于离散元法的深松铲结构与松土效果研究[D].长春:吉林农业大学,2014.
[16]郑侃,何进,李洪文,等.基于离散元深松土壤模型的折线破土刃深松铲研究[J].农业机械学报,2016,47(9):62-72.
[17]邓佳玉.基于离散元法的深松铲耕作阻力的仿真与试验研究[D].大庆:黑龙江八一农垦大学,2015.
[18]顿国强,陈海涛,冯夷宁,等.基于EDEM软件的肥料调配装置关键部件参数优化与试验[J].农业工程学报,2016,32(7):36-42.
[19]王国强,郝万军,王继新.离散单元法及其在EDEM上的实践[M].西安:西北工业大学出版社,2015.
[20]刘凡一,张舰,李博,等.基于堆积试验的小麦离散元参数分析及标定[J].农业工程学报,2016,32(12):247-253.
[21]潘世强.基于离散元法的芯铧式开沟器优化设计与实验研究[D].长春:吉林大学,2015.
[22]王攀.丘陵山区立式单轴果园开沟施肥机的研制与试验研究[D].重庆:西南大学,2017.
[23]邓佳玉,胡军,李庆达,等.基于EDEM离散元法的深松铲仿真与试验研究[J].中国农机化,2016,37(4):14-18.
[24]姜珊珊.基于离散元法的开沟器试验研究[D].长春:吉林农业大学,2014.