Experimental investigation into the active narrowband reshaping of a ship model’s acoustic signatur
Publication date
2025-06-07
Document type
Forschungsartikel
Author
Organisational unit
Project
Aktive Signaturbeeinflussung
Publisher
MDPI
Series or journal
Acoustics
ISSN
Periodical volume
7
Periodical issue
2
Article ID
34
Peer-reviewed
✅
Part of the university bibliography
✅
Language
English
DDC Class
534 Schall und verwandte Schwingungen
Keyword
Noise control
Accelerometer
Virtual hydrophone technique
Active noise equalizer
Structural acoustic brightness
Acoustic signature
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.
Description
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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