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- W2002172029 abstract "Recommendations about the machinery noise measurements have been lately proposed and discussed in ISO. This paper discusses the several problems about the ship noise measurements according to those proposals, and this paper is based upon the results of extensive noise and vibration surveys that, over the last several years, have been made in various types of merchant- and war-ships on their trial navigations. The results of the observations are summarized as follows. (1) Acceleration type vibration pickup, about 10 grams in weight, is good for solidborne noise measurements, as the load effect of the pickup and the effect of the contact surface compliance between the vibrating surface and the pickup, mounted by means of scotch tape with adhesives on both sides, are nearly negligible. It will be desirable to adopt the acceleration levels refered to pi times ten to the minus fifth power centimeters per squ. second and, if necessary, to convert them to the velocity levels referred to five times ten to the minus sixth power centimeters per second. (2) Noise level should be measured by the A weightings of sound level meters regardless of noise levels. Noise (airborne, solidborne) analysis usually should be made by octave band filters depending on IEC recommendation and the conversion between old and new octave band level will be made by interpolation. Noise levels in the ship compartments and acceleration levels on the surrounding walls seem to be dispersed within several decibels." @default.
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- W2002172029 date "1969-03-01" @default.
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- W2002172029 title "A STUDY ON THE SHIP NOISE MEASUREMENT" @default.
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