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In this research,the tire deformations due to rotation are divided into three parts:tread,belt and carcass.Tread deformation is obtained by using a rotating hollow cylinder model,belt expansion is calculated according to the laminated composite shell theory,and a formula of dynamic equilibrium profile is built to investigate carcass deformation.Moreover,a simple method is used to predict the footprint changes caused by tire deformation.Results show that a large deformation is occurring at tire shoulder,a smaller one at tread centre,and the shoulder deformations are mostly caused by carcass.Length of footprint side edges increases with tire rolling speed increasing.The predicted tread,belt,carcass deformations and footprint changes are in good agreement with finite element analysis(FEA) results.The proposed method and the results will offer a helpful guidance to tire and vehicle engineers. 相似文献
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采用有限元方法研究金属表面凸起缺陷对硅橡胶密封性能的影响规律。基于ABAQUS软件,建立密封接触过程有限元模型。重点分析表面凸起的高度、半径和位置对密封性能的影响。结果表明:表面凸起缺陷对密封性能影响显著;高度和位置对接触压力和接触面积影响较大,凸起的高度越大、距离接触压力的峰值位置越近时,越容易发生泄漏;而凸起半径对密封性能的影响相对较小。 相似文献
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New equations are proposed to describe the shapes and sizes of the contact areas between tire and ground(the contact areas) under the conditions of static load,slip,camber,and rolling.The equations are super ellipse and trigonometric function with four parameters.Results indicate that the contact areas under the conditions of static load,slip,camber can be well described by super ellipse,in the most complicated case,fourteen parameters are used.The rolling contact area can be reconstructed by the trigonometric function completely.Symmetrical and asymmetrical shapes can both be described perfectly.The suggested curves will make calculate sizes of the areas easily.The described shapes and sizes are in good agreement with the measured,the maximum deviation is only 2.88%.This work will provide an instrument for understanding the contact area and be helpful for analyzing tire and road. 相似文献
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摩擦系数是轮胎有限元分析的一个关键输入参数,橡胶材料的摩擦系数具有接触压力和滑移率依赖性,而传统的分析大多将摩擦系数设置为常值,因此本文主要分析不同摩擦系数设置方式对轮胎分析的影响。结果显示,摩擦系数随接触压力变化能够影响轮胎纵向力曲线幅值,并且对侧偏时的回正力矩峰值角度有影响;摩擦系数随滑移率变化能够影响轮胎纵向力曲线形状;翻倾力矩曲线对摩擦系数的设置方式并不敏感。本文可为轮胎设计、车胎配套分析和胎面材料配方设计提供指导。 相似文献
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从5种典型接地特性(蝴蝶形、轻微蝴蝶蝶形、近似矩形、胶囊形和椭圆形,编号为a—e型)出发,考虑摩擦因数随接地压力变化,运用数值仿真方法,针对接地特性对轮胎纯侧偏工况下的六分力影响开展研究。结果显示,考虑摩擦因数对接地压力的依赖关系才能体现出接地特性对侧向力的影响,接地特性为d型的轮胎侧向力较大,侧倾力矩和回正力矩由大到小的顺序为e,d,c,b,a型,侧倾力矩受接地特性影响最为显著,可为轮胎设计和车-胎配套分析提供指导。 相似文献