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        Vibrational Energy Properties of Twin–Block Ballastless Track with Anti–vibration Structure on Bridge by Power Flow Analysis

        Na Fu,Zhenhang Zhao,Yutao Liu,Yuxiang Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2

        This article aims to investigate the vibrational energy properties of the twin–block ballastless track with anti–vibration structure (TBTAS) by mobility power flow method. Power flow of the components in TBTAS and bridge are deduced and power flow transfer rate is proposed to present the vibrational energy transmission property of the TBTAS–bridge system. Power flow of rail, twin–block slab and bridge in frequency domain is calculated based on a train–track–bridge interaction model. The effect of the stiffness of the elastic pad on power flow is discussed. The results show that the power flow of the rail exhibits a broad peak in the frequency range of 100 − 400 Hz which corresponds to the broad peak of the rail mobility and exhibits another peak around 1,000 Hz which is the pinned–pinned vibration frequency of the rail. By using elastic pad, the power flow of the bridge reduces by a maximum of 43 dB in the frequency range of 1 − 1,000 Hz. The power flow transfer rate shows that the vibrational energy concentrates in the slab. The vibrational energy of slab and bridge reaches the balance when the stiffness of the elastic pad is 40 MPa/m.

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