Structure Borne Noise Reduction of a Metro Steel Bridge

TL;DRAbstract

Several lines of the European urban rail transportation systems operate over steel bridges dating from the early 1900's. These bridges emit very high structure borne noise during train passage. Since modifying the bridge structure is impossible, trackwork has to be modified to reduce the noise levels. This paper describes a new trackwork design methodology for reducing the bridge vibration levels and the emitted noise. In order to design new trackwork, a reliable dynamic model of the bridge is required. This model is obtained by tuning an initial finite element model of the bridge using experimental measurements. In a first phase, the stiffness matrix is tuned to match the computed static bridge deflections with the measured static deflections under trainload. Secondly the finite element model is tuned to match the computed resonance frequencies with the measured values obtained with a modal analysis test. The validated model is then used to optimize the characteristics of a new rail f

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