基于离散元的履带板旋转挤压水田土壤过程分析  

Analysis of Track Pad Squeezing Soil in Paddy by Rotating Based on Discrete Element Method

作　　者：孙恒辉[1] 宿宁[1] 钱山 黄伟[1] Sun Henghui;Su Ning;Qian Shan;Huang Wei(Hefei Institute of Physical Science,Chinese Academy of Sciences,Hefei City,Anhui Province 230031,China)

机构地区：[1]中国科学院合肥物质科学研究院,安徽省合肥市230031

出　　处：《农业装备与车辆工程》2022年第7期1-5,共5页Agricultural Equipment & Vehicle Engineering

基　　金：国家重点研发计划(2016YFD0700601-1)。

摘　　要：细化研究土壤微观力学有助于优化履带板结构参数,提高履带式拖拉机的牵引力。基于离散元模型分析了履带板和土壤相互作用产生推进力的初始阶段,即履带板旋转挤压土壤时土壤各深度层的滑移现象和履带板受到的土壤反作用力(推进力),基于虚拟试验标定法确定了泥浆的物理特性参数,设置了仿真模拟的边界条件,得到了不同履带板结构和切土速度影响水田土壤滑移现象和履带板受力的变化曲线和影响规律。仿真结果有助于优化水田土壤条件下的履带板结构和尺寸、行驶速度等因素,为提高水田拖拉机通过性能提供技术支持。Detailed study of soil micromechanics is helpful to optimize the structural parameters of track pads and improve the tractive force of crawler tractors.Based on the discrete element model,this paper analyzes the initial stage of the interaction between the track pad and soil,that is,when the track shoe rotates and extrudes the soil,the sliding phenomenon of each depth layer of the soil and the soil reaction force(propulsion force)on the track pad.Based on the virtual test calibration method,the physical parameters of the mud were determined,and the boundary conditions of the simulation were set.The curves of the effects of different track pad structures and cutting speeds on the paddy soil sliding phenomenon and the stress of the track pad were obtained.The simulation results are helpful to optimize the structure and size of track pad,driving speed and other factors under paddy soil conditions,and provide technical support for improving the passing performance of paddy tractor.

关 键 词：水田拖拉机 离散元 履带板结构 牵引力 滑移 

分 类 号：S152.9[农业科学—土壤学]