鋼構造モデルの騒音伝搬に関する実験的研究 (第1報)

概要

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The SEA (Statistical Energy Analysis) method has recently been used to estimate sound and vibration transmission through complex steel structures such as ships. The authors examined the application of this method to prediction of the sound and the vibration levels in two steel structure models, and obtained results summarized as follows: (1) In addition to the resonant power flow, the non-resonant one should be considered for the power transmission through partition panels of adjacent air spaces. (2) Two kinds of power dissipation should be considered besides the internal one. One is the power lost from the model across the boundary of the neighboring structures and the other is the power radiated as sound into the free space. In the calculation, these power losses are taken into account as increments of the internal loss factor of the elements. The values of the internal loss factor for the panel elements used in the calculation were obtained from empirical measurements with steel panels hanged freely in the air. (3) For the sound pressure levels and the vibration levels, the agreement between the calculation results and the experimental ones of two different models was found to be good. (4) The effect of absorption materials (for example glass wool) on the reduction of the sound pressure levels in the models was experimentally investigated and clarified.
社団法人日本船舶海洋工学会の論文
1981-06-30