Abstract
The vibration induced by the high-speed railway (HSR) system has been a severe problem during the construction and operation period. To investigate the vibration-energy properties of the China Railways Track System (CRTS)-III track, a vehicle-track-subgrade coupling model is developed, in which the distribution of the tangent force is symmetrical according to the FASTSIM theory, and the power flow method is utilized. What’s more, the corresponding evaluation indexes of the power flow are proposed to analyze the vibration energy of the track structure. The results reveal that the vibration energy decreases from top to bottom of the track structure among the frequency considered, and the decreasing trend is obvious. The vibration energy of the track structure is sensitive to the stiffness of fasteners. Differently, the vibration energy of the composite slab and the base slab is more sensitive to the stiffness of rubber damping pads than that of the rail. To sum up, this paper can provide a new perspective and method to study the vibration-energy properties and select the reasonable stiffness of the fasteners and the rubber damping pads of the CRTS-III track, and the proposed values of the stiffness of the fasteners and the rubber damping pads for the case under this study are 40 kN/mm and 400 MPa/m, respectively.
Highlights
The vibration induced in the railway system has still been a crucial problem during the construction and operation period, which has drawn a lot of attentions from scholars and researchers
The results convincingly indicated that the vibration mitigation effect of the wave impeding barrier (WIB) would be improved when its modulus and size increased or the embedded depth decreased
Olivier et al [4] developed an finite element (FE) model to investigate the effect of embankment stiffness on ground vibration levels both within and at distance from the track-embankment structure, and it is found that ground vibration levels are sensitive to embankment stiffness, with stiffer embankments resulting in greatly reduced vibration levels
Summary
The vibration induced in the railway system has still been a crucial problem during the construction and operation period, which has drawn a lot of attentions from scholars and researchers. Xin et al [10] established the dynamic analysis model for high-speed train and CRTS-III track coupled system to conduct the analysis of the dynamic effects and the structure optimization of damping layers of CRTS-III track. Zhao and Wang [11] evaluated and analyzed the effects of the rubber mats on noise and vibration of the vehicle, the track system, the bridge, and so on based on the field experiment in one China HSR line. Many researches have made contributions to reduce the ambient vibration induced by the track structure, but these researches ignore the energy redistribution due to the application of rubber damping pads. In this paper, the mobility power flow method is employed to investigate the vibration-energy properties of the track structure in the HSR system, which is taken the CRTS-III track as the research objective.
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