摘要
为研究结构非线性(包括弹性车轮橡胶材料非线性和接触边界非线性)对弹性车轮力学行为的影响,设计静动态试验获得弹性车轮中橡胶材料非线性本构关系并探讨了橡胶黏弹性特性;推导弹性车轮系统中橡胶弹性模量与刚度的转换关系,并确定黏弹性橡胶材料的刚度特性;基于橡胶Yeoh本构模型,建立整体车轮、线弹性车轮、考虑材料非线性特性的弹性车轮(以下简称:非线性弹性车轮)以及同时考虑材料与接触非线性特性的弹性车轮(以下简称:接触弹性车轮)等四个动力学模型,研究四种车轮模型在轮轨垂向力激扰下车轮的动态规律,并探明橡胶材料参数对弹性车轮动态特性的影响.研究表明:弹性车轮能有效降低车轮垂向振动;线弹性车轮的端点和中点较之非线性弹性车轮分别最大增加10%和13%的变形量,且橡胶中点变形量小于端点变形量;线弹性车轮较之整体车轮最大能降低17%的垂向振动,非线性弹性车轮较整体车轮最大能降低22%的垂向振动,同时考虑橡胶材料非线性和接触非线性对弹性车轮的动态特性影响不显著;四种车轮振动主频均为3~5, 10以及22 Hz;弹性车轮的振动和变形量随材料硬度增加而增加.
To research the effect of structural nonlinearity(including rubber material nonlinearity and contact boundary nonlinearity)on the mechanical behavior of resilient wheels,the nonlinear constitutive relation of rubber material in the resilient wheel was obtained by static and dynamic tests,and the viscoelastic properties of rubber were discussed.The conversion relationship between elastic modulus and stiffness of rubber in resilient wheel systems was deduced,and the stiffness characteristics of viscoelastic rubber materials were determined.The rubber Yeoh constitutive model serves as the foundation for four dynamic models of the entire wheel,the linear resilient wheel,the nonlinear resilient wheel,and the contact resilient wheel,which takes into account both material and contact nonlinearity.The dynamic laws of the four wheel models under the vertical force excitation of the wheel and rail are studied,and the influence of the rubber material parameters on the dynamic characteristics of the resilient wheel is explored.We investigate the dynamic laws of models with four wheels when wheel/rail vertical force is excited.Finally,the influence of rubber material parameters on the dynamic characteristics of resilient wheels is studied.The research demonstrates that the resilient wheel can efficiently reduce the vertical vibration of the wheel.The deformation of the linear resilient wheel's endpoint and the midpoint is increased by 10%and 13%,respectively,in comparison to the nonlinear resilient wheel,and the deformation of the rubber midpoint is less than that of the endpoint.When compared to the entire wheel,the linear resilient wheel can reduce vertical vibration by no more than 17%,and the nonlinear resilient wheel can do so by no more than 22%.At the same time,the influence of rubber material nonlinearity and contact nonlinearity on the dynamic characteristics of resilient wheels is not significant.The dominant frequencies of the four wheels'vibrations are 3-5,10,and 22 Hz.As material hardness increases,resilient whee
作者
陈兆玮
蒲前华
龙权明
尚婷
王峙
张军
CHEN ZhaoWei;PU QianHua;LONG QuanMing;SHANG Ting;WANG Zhi;ZHANG Jun('Mechatronics and Vehicle Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Transportation,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Rail Transit(Group)Co.,Ltd,Chongqing 401120,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2024年第4期709-721,共13页
Scientia Sinica(Technologica)
基金
国家自然科学基金项目(批准号:52008067)
中国博士后科学基金面上项目(编号:2019M650236)
重庆市基础研究与前沿探索项目(编号:cstc2018jcyjAX0271)
省部共建山区桥梁及隧道工程国家重点实验室开放基金(编号:SKLBT-19-002)
重庆市建设科技项目(编号:城科字2022第4-6)资助。
关键词
铁路车辆
弹性车轮
橡胶
非线性特性
减振
railway vehicle
resilient wheel
rubber
nonlinear characteristics
vibration reduction
