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Article

Experimental Investigation into the Active Narrowband Reshaping of a Ship Model’s Acoustic Signature

by
Steffen Ungnad
1,*,
Delf Sachau
1,
Carsten Zerbs
2,
Andreas Müller
2 and
Anton Homm
3
1
Department of Mechanical and Civil Engineering, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, 22043 Hamburg, Germany
2
Müller-BBM Industry Solutions GmbH, 22305 Hamburg, Germany
3
Technical Center for Ships and Naval Weapons, Maritime Technology and Research, 24340 Eckernförde, Germany
*
Author to whom correspondence should be addressed.
Acoustics 2025, 7(2), 34; https://doi.org/10.3390/acoustics7020034 (registering DOI)
Submission received: 4 April 2025 / Revised: 15 May 2025 / Accepted: 29 May 2025 / Published: 7 June 2025
Review Reports Versions Notes

Abstract

The use of inertial actuators to control the radiated sound pressure of a steel ship model at a lake measurement facility is examined. Therefore, methods of active vibration control as well as active control of target sound fields are applied using a fixed configuration of twelve accelerometers, eight control actuators, and five hydrophones. A narrowband feedforward active control system is used to manipulate the sound pressure at hydrophone positions, focusing not only on reducing but also on adding spectral lines in the radiated signature. The performance is assessed using measured data by additional accelerometers inside the ship model as well as by hydrophones surrounding the measurement facility. It is found that less control effort is necessary for the generation of additional tones compared to the control of a present disturbance at hydrophones. In the frequency range considered (below 500 Hz), the actively induced change in the mean structural velocity is not necessarily proportional to the change in the radiated sound pressure. In contrast to the vibration velocity, no unwanted amplification of the sound pressure is found for the frequencies observed.
Keywords: active structural acoustic control; active vibration control; active noise equalizer; inertial actuator; virtual hydrophone technique; acoustic signature; complex mode indicator function active structural acoustic control; active vibration control; active noise equalizer; inertial actuator; virtual hydrophone technique; acoustic signature; complex mode indicator function

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MDPI and ACS Style

Ungnad, S.; Sachau, D.; Zerbs, C.; Müller, A.; Homm, A. Experimental Investigation into the Active Narrowband Reshaping of a Ship Model’s Acoustic Signature. Acoustics 2025, 7, 34. https://doi.org/10.3390/acoustics7020034

AMA Style

Ungnad S, Sachau D, Zerbs C, Müller A, Homm A. Experimental Investigation into the Active Narrowband Reshaping of a Ship Model’s Acoustic Signature. Acoustics. 2025; 7(2):34. https://doi.org/10.3390/acoustics7020034

Chicago/Turabian Style

Ungnad, Steffen, Delf Sachau, Carsten Zerbs, Andreas Müller, and Anton Homm. 2025. "Experimental Investigation into the Active Narrowband Reshaping of a Ship Model’s Acoustic Signature" Acoustics 7, no. 2: 34. https://doi.org/10.3390/acoustics7020034

APA Style

Ungnad, S., Sachau, D., Zerbs, C., Müller, A., & Homm, A. (2025). Experimental Investigation into the Active Narrowband Reshaping of a Ship Model’s Acoustic Signature. Acoustics, 7(2), 34. https://doi.org/10.3390/acoustics7020034

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