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Measurement and prediction of sound inboard and outboard of ships as generated by cavitating propellers
A. de Bruijn,T. ten Wolde +1 more
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TLDR
In this paper, a survey is presented in which the noise generated by a cavitating ship propeller can be predicted based on either full scale or model scale experiments, and two sides of the problem are elucidated, i.e., the noise radiated from the propeller into the water and the noise inside the ship.Abstract:
A survey is presented in which manner the noise, generated by a cavitating ship propeller, can be predicted based on either full scale or model scale experiments. Two sides of the problem are elucidated, i.e. the noise radiated from the propeller into the water and the noise inside the ship. For solving the first problem the model technique as used in the depressurized towing tank of the NSMB offers fruitful possibilities. Model rules for the noise-spectrum are given. Also the measuring set-up in this tank is outlined, together with some acoustical considerations about the acoustical properties of the tank. The second part of the paper concerns the problem of noise aboard ships. Most attention is paid to the description of the cavitating propeller as a source of sound. A new measuring technique for the measurement of the acoustical source strength of a propeller is outlined. Emphasis is given on the relation between the vibration problem and the noise problem aboard ships and on the possibilities of the depressurized towing tank in relation to these problems.read more
Citations
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DissertationDOI
Propeller tip-vortex cavitation and its broadband noise
TL;DR: In this paper, a semi-empirical method for the prediction of broadband noise by tip-vortex cavitation was proposed. But the method is limited to the case of a single propeller and does not consider the effect of viscosity.
Proceedings ArticleDOI
Computational and experimental prediction of propeller cavitation noise
TL;DR: In this article, the prediction of underwater-radiated noise due to propeller cavitation as in use at MARIN is discussed for three cases, viz a cruise liner, a container vessel and a catamaran, all taken from EU project SONIC.
Book ChapterDOI
Hydrodynamically Induced Cavitation and Bubble Noise
TL;DR: In this paper, a single bubble is used to derive general and practical scaling procedures for hydrodynamically induced cavitation noise in terms of physically measurable quantities, and less noisy types of bubble noise, such as noise emanating from the formation and splitting of bubbles which cause simple harmonic oscillations of bubble walls, are described.