Abstract
Although the high-speed railway (HSR) system has been widely agreed to be a sustainable and convenient means of transportation, the vibration induced has already been deemed an urgent environmental problem. For the sake of investigating the vibration characteristics of the ballastless track on bridges in the HSR system from the point of view of energy, a numerical model of the vehicle–track–bridge coupled system is developed herein and the energy method based on power flow theory is employed. In addition, a corresponding evaluation method of the power flow theory is developed to evaluate the vibration characteristics of the track–bridge system. The conclusions indicate that (1) the vibration energy gradually attenuates from top to bottom of the track–bridge system in its transfer process. Moreover, the attenuation effects are mainly the result of the elasticity and damping effects of the fasteners and the slab mat layer. (2) With increasing slab mat layer stiffness, the vibration energy of the rail slightly decreases; on the contrary, that of the slab track and the bridge obviously increases. (3) With increasing fastener stiffness, the vibration energy of the entire track–bridge system increases. (4) With increasing running speed, the vibration energy of the entire track–bridge system rises obviously. The results reveal that the reasonable stiffness levels of the fasteners and the slab mat layer are 40 to 60 kN/mm and 40 to 60 MPa/m, respectively, under the investigated condition in this work. This work also presents a novel way to study the vibration characteristics of the ballastless track on bridges of HSRs in terms of energy.
Highlights
With the rapid development of the high-speed railway (HSR) system, the length of HSRs in service in China has exceeded 35,000 km, and the convenience brought has been obvious to all.the induced vibration and noise have become increasingly acute
The results reveal that the reasonable stiffness levels of the fasteners and the slab mat layer are 40 to 60 kN/mm and 40 to 60 MPa/m, respectively, under the investigated condition in this work
Six degrees of freedom (DOF), which are in the vertical, lateral, longitudinal, body with six degrees of freedom (DOF), which are in the vertical, lateral, longitudinal, pitching, yawing, and rolling directions, was employed to simulate the car body, bogies, and wheelsets
Summary
The induced vibration and noise have become increasingly acute. Faced with these problems, numerous researchers have worked to address them. The structure-borne noises of a viaduct were analyzed via the finite element method (FEM). Jiang et al [2] established a coupled model of the HSR supported beam bridge–track structure system (HSRBTS), in which the effect of shear deformation was taken into account. The natural vibration characteristics of HSRBTS under different interlayer stiffness and lengths of rails at different subgrade sections were evaluated by means of the analytic method put forward in that paper. The environmental vibration levels of HSRs were analyzed and evaluated
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