聴覚見張についての一考察

概要

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According to the Convention on the International Regulations for Preventing Collisions at Sea, 1972., is stated clearly in Rule 5 that aural look-out shall be maintained at all time. How shall we do as a navigator keep a proper watch concerning aural look-out considering the signal? So we practised the measurement of noise level of experimetal ship and analysed them and then gained the total transmission loss and minimum audible sound pressure. We compared the minimum audible sound pressure in the opened-bridge with closed-bridge. 1. Noise level of experimental ship's bridge is very high and so threshold of audibility is high. We need to contrive to deaden the noise of bridge. 2. Minimum audibility sound pressure level in the opened-bridge is less 10〜20dB than closed bridge. 3. We must always keep a watch under opening windows and doors. 4. Distance of audibility on the experimental ship is extremely short.
社団法人日本航海学会の論文
1976-01-20