中国农业科技导报2024，Vol.26Issue(3)：98-109,12.DOI:10.13304/j.nykjdb.2023.0523
多种材料与不同含水率土壤的离散元接触参数标定
Calibration of Discrete Element Contact Parameters for Various Materials and Soils with Different Moisture Content
摘要
Abstract
The applicable range of contact parameters between existing soil and touching soil component materials is relatively narrow,making it difficult to simulate operating conditions under high moisture content.In order to explore the adhesion of various materials to soil with different moisture contents and more accurately solve the adhesion problem between touching soil components and soil,this article took southern stubble soil planting rice as the object,and used the"Hertz Mindlin with JKR Cohesion"model in EDEM to calibrate the contact parameters of soil with different moisture contents and 45# steel,ultra-high molecular weight polyethylene(UHMWPE),polytetrafluoroethylene(PTFE).On the basis of previous tests,Box-Behnken four factor and three level tests were designed with impact restitution coefficient,static friction coefficient,rolling friction coefficient and JKR as test factors and soil rolling distance as test indicators.Finally,the regression model was optimized,and the optimal parameters of collision coefficient of restitution,static friction coefficient,rolling friction coefficient and JKR of soil with 21％,26％,31％(±1％)moisture content and 45# steel,UHMWPE,PTFE were obtained.The maximum relative error between the simulated rolling distance and the measured rolling distance was 3.46％,indicating that the calibrated parameters were accurate and reliable,and provided reference for the design of touching soil components in reducing adhesion and detachment.关键词
含水率/离散元法/参数标定/减粘脱附Key words
moisture content/discrete element method/parameter calibration/reducing adhesion and detachment分类
农业科技引用本文复制引用
黄元昊,全腊珍,胡广发,全伟,石方刚..多种材料与不同含水率土壤的离散元接触参数标定[J].中国农业科技导报,2024,26(3):98-109,12.基金项目
湖南省自然科学基金项目(2019JJ40136) （2019JJ40136）
湖南省自然科学基金面上项目(2021JJ30344). （2021JJ30344）
