基于模型履带板的斜坡最大剪应力计算模型构建与验证  

Construction and validation of maximum shear stress calculation model based on track shoe model under sloped conditions

作　　者：潘冠廷 张景钰 张妍 穆龙涛 PAN Guanting;ZHANG Jingyu;ZHANG Yan;MU Longtao(College of Mechanical Engineering,Shaanxi Polytechnic Institute,Xianyang Shaanxi 712000,China;Engineering Research Center of Composite Movable Robot,Universities of Shaanxi Province,Xianyang Shaanxi 712000,China)

机构地区：[1]陕西工业职业技术学院机械工程学院,陕西咸阳712000 [2]复合型移动机器人陕西省高校工程研究中心,陕西咸阳712000

出　　处：《农业工程》2024年第9期92-97,共6页AGRICULTURAL ENGINEERING

基　　金：陕西省教育厅2023年度科学研究计划项目(23JK0311)。

摘　　要：在山地斜坡路面工况下,履带拖拉机行走系对土壤施加的最大剪应力是拖拉机高效行驶的动力基础,由于经典的库伦公式未考虑履带剪切速率、斜坡角度、土壤含水率等实际因素的影响,不能直接应用于履带拖拉机在斜坡路面工况下的行驶力学计算。针对该问题,在不同土壤含水率条件下进行了直剪试验,得到土壤抗剪强度参数随含水率变化的数学模型。采用二次旋转正交组合试验,探究了履带板在不同剪切速率及斜坡角度下对土壤最大剪应力的影响规律,并对经典库伦公式进行修正。验证试验表明,在不同土壤含水率、剪切速率和斜坡角度条件下,最大剪应力试验值与理论值之间的相对误差均<5%,表明修正后的库伦公式可准确反映各因素对最大剪应力的影响,可为履带拖拉机在斜坡路面工况下的行驶力学计算、性能分析提供理论依据。When crawler tractors travel on sloped terrain,the maximum shear stress of soil exerted by tracks serves as basis for powering tractor.The classical Coulomb formula does not take into account practical factors such as soil moisture content,track shear rate,and slope angle,and it cannot be directly applied to mechanical performance analysis of crawler tractors under slope conditions.In response to this issue,direct shear tests were conducted under different soil moisture conditions to obtain a mathematical model of variation of soil shear strength parameters with moisture content.Influence of track shoes on the maximum shear stress of soil under different shear rates and slope angles was investigated using a quadratic orthogonal combination experiment,and the classical Coulomb formula was modified.Verification test showed that under different soil moisture content,shear rate,and slope angle conditions,relative error between the maximum shear stress test value and theoretical value was less than 5%.This indicated that modified Coulomb formula could accurately reflect influence of various factors on the maximum shear stress,and could provide a theoretical basis for driving mechanics calculation and performance analysis of track tractors under slope road conditions.

关 键 词：履带拖拉机 履带板 斜坡 最大剪应力 土壤剪切 库伦公式 

分 类 号：S229[农业科学—农业机械化工程]