Abstract：Polyurethane filling material embedded in track structure has obvious superelastic properties, which has great influence on mechanical behavior and vibration and noise of track system.For the study of filler material hyperelastic properties of embedded track dynamic characteristics of wheel/rail system, the influence of welding joint is not smooth, for example, set up to consider filling material of the hyperelastic constitutive embedded track three-dimensional transient finite element model of rolling contact of wheel and rail, and analyses the influence of welding seam is not smooth embedded track wheel/rail transient rolling contact mechanics behavior.The results show that the simulation results can well simulate the energy conversion and vibration reduction process of polymer material when it is impacted by external force when the filler material adopts the hyperelastic constitutive model.The short wave irregularity wavelength and wave depth of welded joint have significant influence on wheel-rail impact response.The wheel/rail impact load increases with the increase of vehicle speed, and the corresponding main frequency band of wheel/rail dynamic response also moves up obviously. The location of the extreme contact stress on the rail surface has a great relationship with the geometry of the weld. The contact spot area and the peak value of the contact stress basically appear at the low collapse of the weld. The polyurethane filling material has no obvious inhibition effect on the vibration of lower frequency (below 400Hz), but has a good inhibition effect on the high frequency vibration of 500-2000Hz. The vibration reduction characteristics of embedded track show a certain frequency correlation.
何傲男1,2,王凯1,2,徐井芒1,2,郝超江1,2,廖涛1,2,王平1,2. 嵌入式轨道超弹性力学属性对轮轨动态作用的影响研究[J]. 振动与冲击, 2023, 42(11): 48-57.
HE Aonan1,2, WANG Kai1,2, XU Jingmang1,2, HAO Chaojiang1,2, LIAO Tao1,2, WANG Ping1,2. Study on the influence of embedded track hyperelasticity on the dynamic action of wheel and rail. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(11): 48-57.
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