船室の防振内装に関する研究 : 第2報:空気音対策による船室の防振内装壁の振動低減効果の向上

概要

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This paper presents the experimental studies on reducing a vibration level of the lining walls, which are supported resiliently on the steel walls, by using a sound insulating technique. The following conclusions are obtained: The vibration level of a light panel, resiliently mounted on a vibrating steel panel, is higher than that of a heavy panel. This is caused by the mechanism that the light panel is easy to be excited by air-borne sound which radiates from the steel panel. The contribution of the excitaion of air-borne sound can be estimated by measuring the sound pressure and dynamic response of the panel. High density rockwool boards, whose density is 150kg/m^3 and thickness is 50mm, have much the same sound insuiatin power as the sound insulating sheet with surface density 3.4kg/m^2 has. These two materials can reduce the vibration level of the lining wall's surface by roughly 10dB in the frequency range 315Hz〜4kHz, comparing to the one without the sound insuation. It is proposed that the lining walls are to be supported only on the floating floor and have not any supporting points on the steel walls. As high effect of reducing vibrations of the lining walls as that of the floating floor may be attained by the proposed supporting method of the walls together with enough sound insulation.
独立行政法人海上技術安全研究所の論文
1986-07-30