Prediction of the Decrease of Vibration of Railway Steel Bridge by Applying Magnetic Rubber Damper with a Constraining Layer

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  • 拘束型磁性制振材による鋼鉄道橋の振動低減効果の予測
  • コウソクガタ ジセイ セイシンザイ ニ ヨル コウ テツドウキョウ ノ シンドウ テイゲン コウカ ノ ヨソク

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Abstract

To improve vibration damping properties and workability of installation onto steel vibrating objects such as railway steel bridges, the authors have developed a magnetic rubber damper with a constraining layer (MRDC), which consists of a constraining layer made of steel and a magnetic rubber layer. The damping property of MRDC is apparently different from the conventional adhesive dampers because the magnetic rubber layer of MRDC slips relatively on the vibrating base layer. In the previous papers, the damping properties of a beam or plate covered with a sheet of MRDC were theoretically analyzed based on the theory of flexural vibration of a beam or plate taking the relative slip motion into account and the equations to calculate the loss factor of the beam or plate with MRDC were derived. In this paper, the damping property of MRDC installed onto the web plates of railway steel bridge is discussed. An equation to calculate the decrease of vibration of the web plates of bridge due to the installation of MRDC is derived based on the proposed theory of flexural vibration of plate and those calculated results have been compared with the date measured at a through plate girder type of railway steel bridge.

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