Dynamic characteristics of railway resilient wheel considering structural nonlinearity
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 wheels experience more vibration and deformation.
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