Abstract：There are obvious differences between the elastic pad support method of the new elastic side-supported long sleeper type damping track (ESSLSDT) and the existing sleeper type damping track. And the mechanical characteristics and key parameters of the ESSLSDT are investigated in detail in this work. Firstly, to identify the stress concentration area and the most unfavorable location in the track bed, the stress contours of the two types of damping tracks are compared under moving wheel load, the stress distribution characteristics of the components of the ESSLSDT are investigated when the load is applied on the different positions of ESSLSDT, and the damping characteristics of track bed are studied. Then, the stress distribution at the corner of the sleeper groove and the design and check calculation of the overall track bed reinforcement are analyzed for the most unfavorable position when the load acts on the long sleeper. Finally, the influence of thickness, spatial inclination and material hardness of the side-supported elastic pad on the dynamic stiffness and vertical maximum displacement of the long sleeper is studied by using the combination of experimental and simulation methods. The results show that the maximum stress of the track bed of the ESSLSDT is located near the corner of the bottom of the sleeper groove, which is quite different from that of the existing sleeper type damping track in the middle of the bottom of the bearing rail groove and has better damping effect. The reinforcement scheme of the track bed refers to the existing longitudinal rail bearing platform monolithic track bed, which can meet the engineering design requirements and make sure that the lower corner of the two sides of the sleeper groove will not cause crack. The thickness, spatial inclination and material hardness of the side-supported elastic pad are three key factors affecting the dynamic stiffness of the ESSLSDT, in which the thickness and material hardness of the side-supported elastic pad have a significant effect on the dynamic stiffness the ESSLSDT, while the effect of the spatial inclination is smaller. As the thickness of the side-supported elastic pad increases, the hardness of the side-supported elastic pad material decreases and the spatial inclination increases, the dynamic stiffness of the ESSLSDT decreases, the area of the hysteresis curve increases and the hysteresis energy consumption increases.Therefore, the dynamic stiffness of the ESSLSDT with different damping levels can be obtained by taking values of the three key parameters to meet the relevant specification requirements.
曹子勇，和振兴，苏程，包能能，王玉魁，贠剑峰. 新型弹性侧支撑长轨枕式减振轨道结构力学特性研究[J]. 振动与冲击, 2023, 42(17): 25-34.
CAO Ziyong, HE Zhenxing, SU Cheng, BAO Nengneng, WANG Yukui, YUN Jianfeng. Mechanical characteristics of new type long sleeper damping track structure with elastic lateral support. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(17): 25-34.
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