Simulation of front end loader bucket–soil interaction using discrete element method
Simulation of front end loader bucket–soil interaction using discrete element method
复制标题
使用离散元法模拟前端装载机铲斗与土壤的相互作用
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Ghaboussi
中科院分区：
文献类型：
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作者：
E. Nezami;Y. Hashash;Dawei Zhao;J. Ghaboussi
运土设备的设计需要可靠地估计来自待操纵的土壤或岩石的阻力。一系列的离散元模拟与多面体颗粒设计复制一系列桶土相互作用的实验。实验涉及操纵一堆砾石，由角和次圆形颗粒组成，具有前端装载机铲斗的原型。采用离散元法（DEM）模拟了土桩的几何形状和铲斗的轨迹。所有模拟均使用一组DEM模型属性，包括在实验开始前根据土桩初始配置估计的颗粒间接触摩擦角。从每个模拟计算出在水平和垂直方向上作用在铲斗上的总土壤反作用力，并将其与相应实验的测量力进行比较。结果表明，与多面体颗粒的模拟和实验之间的定性和定量的协议与角和次圆颗粒。差异的主要来源是由于与实验相比，模拟中的颗粒尺寸较大。使用更小的颗粒改善了结果，并提供了与实验更好的匹配。其他来源的差异也进行了讨论。仿真结果表明，多面体颗粒的DEM可以用来可靠地模拟桶-土相互作用，并估计到土方设备的力反馈。版权所有© 2007约翰威利父子有限公司。
The design of earthmoving equipment requires reliable estimates of resisting forces from the soil or rock to be manipulated. A series of discrete element simulations with polyhedral particles designed to replicate a series of bucket–soil interaction experiments are presented. The experiments involve manipulation of a pile of gravel, consisting of angular and sub‐rounded particles, with a prototype of a front end loader bucket. The geometry of the soil pile and the trajectory of the bucket from each experiment are simulated using discrete element method (DEM). A single set of DEM model properties, including inter‐particle contact friction angle estimated from the initial configuration of the soil pile prior to the start of the experiments, are used for all simulations. The total soil reaction forces acting on the bucket in both horizontal and vertical directions are calculated from each simulation and are compared to measured forces from the corresponding experiment. The results show both qualitative and quantitative agreement between simulations with polyhedral particles and experiments with angular and sub‐rounded particles. The major source of discrepancy is attributed to the large particle sizes in the simulation compared to the experiments. Using smaller particles improves the results and provides a better match with the experiments. Other sources of discrepancy are also discussed. The simulations demonstrate that DEM with polyhedral particles can be used to reliably simulate bucket–soil interaction and to estimate force feedback into earthmoving equipment. Copyright © 2007 John Wiley & Sons, Ltd.