セミサブリグの簡易騒音予測法と実機への適用

概要

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A practical method is developed for predicting the noise levels of offshore structures such as a semi-submersible drilling rig at an early design stage. This is based on the empirical method of ship noise prediction presented by J.H.Janssen. In order to estimate the noise levels of offshore structures, transmission decreases of structure borne noise through the complex structures between cabins and noise sources are represented in terms of the number of decks and girders, and the transmission path. On newly built semi-submersible drilling rig "West Venture", the noise level measurements are carried out. And the data of transmission decrease, absorption coefficient etc.are obtained in sea trial. About 62% of the calculated results is in agreement with measured results with an accuracy of ±5dB. Comparison of the calculated and measured results has validated the reliability and suitability of the proposed method. Also the vibration transmission on steel deck with damping treatment is investigated using S.E.A.(Statistical Energy Analysis)method. It has confirmed that S.E.A. method is useful to estimate transmission decrease.
社団法人日本船舶海洋工学会の論文
2000-09-25