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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Notes
- 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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Acknowledgements
The excellent support from the engineering branch of WTD 71, from ATLAS Elektronik, and from Captain and Crew of RV Elisabeth Mann Borgese (IOW, Germany) is gratefully acknowledged.
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Abshagen, J., Küter, D., Nejedl, V. (2019). Turbulent Flow Noise Generation Under Sea Conditions. In: Ciappi, E., et al. Flinovia—Flow Induced Noise and Vibration Issues and Aspects-II. FLINOVIA 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-76780-2_20
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