Jixie qiangdu (Jan 2020)
RESEARCH ON DYNAMIC AND STATIC STIFFNESS CHARACTERISTICS OF MESH ELASTIC PAD
Abstract
Elastic cushion plays an important role in alleviating the dynamic interaction between train and its running foundation. The ratio of static stiffness to dynamic stiffness is the key parameter to determine the alleviation performance of elastic cushion. Aiming at a new type of honeycomb mesh-type elastic cushion plate structure,a three-dimensional finite element model was established,and the mechanical properties of rubber material were simulated by super-elastic and viscoelastic constitutive models. Under the condition that the material parameters of elastic cushion plate were unchanged,the effects of the change of key parameters such as mesh thickness and aperture on the dynamic and static stiffness of mesh-type elastic cushion plate were studied,and the traditional groove elastic cushion plate was compared. The results show that: under the condition of constant mesh aperture,with the increase of mesh wall thickness,the static stiffness of elastic cushion plate increases and the ratio of dynamic stiffness to static stiffness decreases; under the condition of constant mesh wall thickness,with the increase of mesh aperture,the static stiffness of elastic cushion plate decreases and the ratio of dynamic stiffness to static stiffness increases;compare with the traditional grooved elastic cushion plate with similar static stiffness,the meshed elastic cushion plate has the characteristics of lower dynamic and static stiffness,smaller maximum stress value and more uniform stress distribution.Therefore,reasonable adjustment of mesh wall thickness and aperture size can make mesh elastic cushion plate suitable for track structures with different stiffness requirements,and the application of mesh structure to under rail elastic cushion plate can enhance the force transmission characteristics of cushion plate and prolong the service life of cushion plate.
