Hydroacoustics and ship noise

Overview

ABSTRACT

Hydroacoustics refers to noises caused by hydrodynamic phenomena and generally concerns "underwater acoustics" which allows, amongst other things, for identifying fish shoals. The subject of this article is "ship noise" which is not concerned by the term hydroacoustics. These ships emit various types of noises: noise in the water ( their sound radiation) and noise on board (passengers, crew and noise radiated into the air). The differences between air and water are presented in order to outline the subject matter. The fluctuating flows and forces are then detailed. The noise generated by propellers is obviously included in "ship noise". This article finally explains how acoustic measurements are conducted in water.

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AUTHOR

Gérard FOURNIER: Doctor of Science - GFIC Scientific Advisor

INTRODUCTION

Just as aeroacoustics deals with the noise generated by aerodynamic phenomena (see article "L'aéroacoustique en aéronautique" in the same treatise), hydroacoustics here refers to noise associated with hydrodynamic phenomena. But as this contracted word most often refers to "acoustics in water", whose main application is fish school tracking, the title has been supplemented by "ship noise" for greater clarity. Ship noise is both the noise radiated into the water, to which only the military attach great importance (problems of detection and stealth), and the noise on board, which concerns passengers and crew, as well as the noise radiated into the air, which can pose problems in the vicinity of port facilities. General concepts are already covered elsewhere in this "Noise and Vibration" treatise. For fundamental aspects, please refer to the following articles to "Aeroacoustics and hydroacoustics". Reference is also made to the following articles , "Fan noise" and "Noise of pumps".

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