Application of Vibration Damping Steel Sheet to Reduce High Frequency in Ship Structure

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Other Title
  • 制振鋼板の船舶への応用
  • セイシン コウハン ノ センパク エ ノ オウヨウ ジッセン エ ノ オウヨウ
  • —Test on Board and Experimental Anaiysis Structual Model—
  • ―実船への適用と模型実験―

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Abstract

Recently, vibration damping steel sheet (VDSSs) are broadly applied to many types of industrial products for reducing noise and vibration. To valuate the effect of VDSSs on noise reduction of ship's structure, two types of experimental studise, i.e., onboard one and laboratory one, were carried out. By the result, it is concluded that the application of VDSSs for ship's structure can be a effective measure for noise reduction.<BR>Onboard experiment was carried out on the training ship “Gingamaru”. In the experiment, VDSSs were partly fitted on cabin walls which were made of steel plate by welding. The nice level measured during sea going condition and berthing condition. Reduction of noise level due to VDSSs were 6 dB (A) and 14 dB (A) under sea going condition and berth ingcondition, respectively.<BR>In the laboratory experiment, open top box type model were used. One model was made of VDSSs and the other was made of ordinary steel Plateas the reference. The distributions of vibration of both models were measured and compared. By the result, it is pointed out that the VDSSs is effective for reducing vibration having the frequency higher than 500 Hz.

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