基于DEM-MBD耦合算法的振动深松土壤扰动过程分析  

Analysis of soil disturbance process by vibrating subsoiling based on DEM-MBD coupling algorithm

作　　者：董向前[1] 苏辰 郑慧娜 韩瑞球 李永磊[1] 万里鹏程 宋建农[1] 王继承[1] Dong Xiangqian;Su Chen;Zheng Huina;Han Ruiqiu;Li Yonglei;Wan Lipengcheng;Song Jiannong;Wang Jicheng(Key Laboratory of Soil-Machine-Plant Systematic Technology,Ministry of Agriculture and Rural Affairs,China Agricultural University,Beijing 100083,China)

机构地区：[1]中国农业大学农业农村部土壤-机器-植物系统技术重点实验室,北京100083

出　　处：《农业工程学报》2022年第1期34-43,共10页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点研发计划(2016YFD0700302/2016YFD0701605)。

摘　　要：为深入分析振动深松过程中耕层土壤扰动过程,该研究采用离散元法(Discrete Element Method,DEM)与多体动力学(Multi-Body Dynamics,MBD)耦合算法对振动深松作业过程进行仿真分析。采用MBD构建拖拉机-振动深松机-土壤系统仿真模型,利用DEM建立耕作土壤的离散元模型,考虑土壤颗粒的黏性、弹性和塑性,采用非线性粘结弹性塑形(Edinburgh Elasto-Plastic Adhesion,EEPA)接触模型分析振动作用下全方位深松铲对土壤的扰动作用。仿真结果表明:作业过程中土壤扰动分界面与铲尖运动轨迹重合;在入土行程阶段铲尖对土壤扰动形成新月形扰动区域;在振动频率f为5 Hz且前进速度v为0.56 m/s条件下,振动作业阶段土壤颗粒速度呈现出低速0~0.1 m/s、中速0.1~0.3 m/s和高速0.3~0.5 m/s分布,依此将铲尖附近区域划分为过渡区、回填区和扰动区,各个区域随时间周期规律性变化和循环;深松铲在空间范围内对土壤的扰动主要聚集在铲体结构内部,扰动范围取决于全方位深松铲的最大横截面积,通过土槽试验验证了土壤扰动截面轮廓形状与仿真结果具有一致性。研究结果直观呈现了振动深松机对土壤的扰动过程及土壤颗粒的速度分布情况,可为定性解释全方位深松铲对土壤的扰动情况提供参考。Current technology and measurement have posed a serious limitation on theoretical analysis of soil trough and field test in an active vibration subsoiler in recent years. This study aims to clarify the influence of complex vibration on topsoil disturbance using the discrete element method(DEM) and multi-body dynamics(MBD) coupling algorithm. The process of vibrating subsoiling was also simulated to delve into the behavior of soil disturbance under the complex vibration and motion.A simulation model was then established for the tractor-vibrating subsoiler-soil system. SolidWorks software was used to create the three-dimensional(3D) models with the simplified mechanical structure. The obtained 3D modes were imported into Adams platform to be constrained, driven, and simulated, according to the actual working conditions of the vibrating subsoiler.The vibration stability index was established for the whole simulation model of the tractor-vibrating subsoiler-soil system. The Edinburgh Elasto-Plastic Adhesion(EEPA) contact mechanics model was adopted to consider the viscosity, elasticity, and plasticity of soil particles, indicating an excellent simulation for most soils. The coupling simulation of EDEM and Adams was carried out to determine the coupling files and parameters using the Co-simulation program in Adams. The main object was focused on the disturbance behavior of the adjacent Omni-directional deep loosening shovel to the surrounding soil. The working process of the vibrating subsoiling machine was also simulated to evaluate the vibration and the disturbance effect,together with the frame structure of the Omni-directional deep loosening shovel on the soil. The results show that the soil disturbance interface was highly coincident with the theoretical trajectory of Omni-directional deep loosening shovel, and the cross-sectional soil disturbance in the forward direction was in the M-shaped ridge and V-shaped groove. The motion state of the simulation model was divided into the soil penetrating and the vibration

关 键 词：离散元法 振动 深松 多体动力学 耦合算法 

分 类 号：S222.129[农业科学—农业机械化工程]