基于DEM的推土机铲刀曲面参数化设计分析
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摘要
为合理地选择推土机铲刀曲面参数,本文利用基于离散单元法(DEM)的EDEM软件模拟铲运过程.模拟中选用三种形状的石块混合物料作为被铲运介质,对三种曲率半径的圆弧面铲刀和两种形式的直线-圆弧复合式铲刀在水平铲运工作时所受的工作阻力进行了对比分析,发现不同曲面参数的铲刀在水平铲运时的工作阻力主要来自于水平前进方向,圆弧面铲刀的水平阻力随曲率半径的减小而增大,而竖直向阻力会随着曲率半径增大而由向上逐渐转变为向下;直线在上-圆弧在下复合式铲刀所受的水平阻力始终大于直线在下-圆弧在上复合式铲刀所受的水平阻力,铲刀曲面几乎不受侧向力.
In order to select the blade surface parameters of the bulldozer properly, the EDEM software based on Discrete Element Method(DEM) was used to simulate the scraping process in this paper. Three different shapes of stone mixed material were selected as the bulldozed medium. The working resistances on three circular-arc blades with different curvature radii and two line-arc mixed blades during the horizontal bulldozing process were compared with each other. It is shown that the horizontal working resistance was the dominating resistance for all kinds of bulldozer surfaces. With the increase of curvature radii, the horizontal resistances of circular-arc blades decreased, and the vertical resistances changed from positive value to negative value gradually. In addition, the horizontal resistance of the arc-below-line mixed blade is always larger than that of the line-below-arc mixed one. The lateral resistances on all blades are nearly negligible.
In order to select the blade surface parameters of the bulldozer properly, the EDEM software based on Discrete Element Method(DEM) was used to simulate the scraping process in this paper. Three different shapes of stone mixed material were selected as the bulldozed medium. The working resistances on three circular-arc blades with different curvature radii and two line-arc mixed blades during the horizontal bulldozing process were compared with each other. It is shown that the horizontal working resistance was the dominating resistance for all kinds of bulldozer surfaces. With the increase of curvature radii, the horizontal resistances of circular-arc blades decreased, and the vertical resistances changed from positive value to negative value gradually. In addition, the horizontal resistance of the arc-below-line mixed blade is always larger than that of the line-below-arc mixed one. The lateral resistances on all blades are nearly negligible.
引文
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[9]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.
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[2]方会敏,姬长英,FARMAN A C,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.
[3]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.
[4]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.
[5]韩志武,崔占荣,任露泉,等.非光滑仿生曲面形推土铲推土阻力试验研究[J].农业机械学报,2002,33(2):125-126.
[6]张金波,佟金,马云海.仿生减阻深松铲设计与试验[J].农业机械学报,2014,45(4):141-145.
[7]LI B,CHEN Y,CHEN J.Modeling of soil-claw interaction using the discrete element method(DEM)[J].Soil&Tillage Research,2016,158(1):177-185.
[8]王瑶.基于离散元方法的平地机铲刀工作性能研究[D].长春:吉林大学,2015.
[9]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.
[10]TSUJI J,NAKAGAWA Y,MATSUMOTO N.3-D DEM simulation of cohesive soil-pushing behavior by bulldozer blade[J].Journal of Terramechanics,2012,49:37-47.
[11]连晋毅.铲土运输机械设计[M].北京:机械工业出版社,2012.