船の騒音について

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The airborne and solidborne noise measuring equipment, small in size and light in weight was especialily devised for ship, and various tests have been made for practical use.Using this equipment, noise and vibration measurement were made by several types of ship on their trial navigations. The results of observation about hte noise source, psectrum and the caclulated loudness will be summarized as follows ;1) The relation between the calculated loudness of noise(Loudness Level, Perceived Noise Level, Noise Rating Nimber)and A, B, C, sound level were established and the results showed that good correlation was obtained between the calculated loudness and the A sound level calculated from the original noise spectra.2) The judgement of ship. noise will be made by using the calculated regression lines or more simply by adding the value of 8 (LL), 15 (PNL), and -3 (NRN) to the indicated A-sound level, so the ship noise shoud be measured by A weighting regradless of noise level.3) In accommodation spaces, the noise, largely solidborne, has a spectrum that slopes off approxim ately 5 dB/oct with increasing frequeny and the A sound level is about 70±20 phon. In engine room, however, noise has more eneryg at middle and high frequency and the level is nearly 95±10 phon.
社団法人日本船舶海洋工学会の論文