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Published in:
Low Wavenumber Models for Turbulent Boundary Layer Excitation of Structures Read chapter Read first chapter

2019 | OriginalPaper | Chapter

Turbulent Flow Noise Generation Under Sea Conditions

Authors : Jan Abshagen, Dennis Küter, Volkmar Nejedl

Published in: Flinovia—Flow Induced Noise and Vibration Issues and Aspects-II

Publisher: Springer International Publishing

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Abstract

Flow-induced noise contributes to the self-noise level of a hydroacoustic antenna that is either attached to or towed behind a moving platform at sea. It is induced in the interior of the antenna by hull vibrations excited by an outer turbulent boundary layer. Two different hull configurations were studied in a research cruise with an underwater towed body measurement system in Sognefjord, Norway. While the hydrophones were embedded into the hull structure in one of the flat plate configurations, they were separated from the hull by a water layer in the other. Material properties and hydrophone positions with respect to the flow were very similar in both configurations. By means of wavenumber–frequency analysis, the (flow-induced) spectral noise level is determined for towing speeds ranging from 4 to 12 kn. The noise level at the embedded hydrophones is systematically higher for all speeds than that at the separated hydrophones.

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previous chapter Fuselage Excitation During Cruise Flight Conditions: From Flight Test to Numerical Prediction
next chapter Measurement Techniques of the Sensitivity Functions to Characterize the Vibration Response of Panels Under Turbulent Boundary Layer Excitation
Footnotes
1
In hydroacoustics, the notation k is often used for both a wavenumber given in (\(2\pi m^{-1}\)) and in (\(m^{-1}\)). Since the former is used in relation to the angular frequency \(\omega \) while the latter in relation to the frequency f, we will adopt the common notation and also write k instead of \(\tilde{k}\) in the following.
 
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Metadata
Title
Turbulent Flow Noise Generation Under Sea Conditions
Authors
Jan Abshagen
Dennis Küter
Volkmar Nejedl
Copyright Year
2019
Book
Flinovia—Flow Induced Noise and Vibration Issues and Aspects-II

Print ISBN: 978-3-319-76779-6

Electronic ISBN: 978-3-319-76780-2

Copyright Year: 2019

DOI
https://doi.org/10.1007/978-3-319-76780-2_20

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