KAGOSHIMA MARU Engine Room Noise and Crew's Hearing Impairment

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  • かごしま丸機関室騒音と聴力障害
  • カゴシママル キカンシツ ソウオン ト チョウリョク ショウガイ

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It was found that the environmental noise level in the engine room of the fishing training ship Kagoshima-maru was 95~100 dB. Therefore, the frequency analyses of the noise in the engine room and the engine control room, and audiometry for crew were carried out. The maxima sound levels were appeared at 50~75 Hz, 125 Hz, 250 Hz, 500 Hz, 800 Hz, 900 Hz respectively. The soundproof effect of the engine control room had a maximum at 1.3 kHz, with 47 dB attenuation of the sound level. Results of 1/3 octave frequency analysis, confirmed that the crews of engine department are in a dangerous condition about hearing loss at the frequency band 0.7 kHz~6 kHz. From the results of audiometry, a good many crews of engine department are found to have the C^5 Dip which is a characteristic of noise deafness.

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