Underwater acoustic radiation of plane surfaces with an active coating
Translated title
Unterwasser-Schallabstrahlung von ebenen Oberflächen mit einer aktiven Beschichtung
Publication date
2025-04
Document type
Konferenzbeitrag
Author
Organisational unit
Conference
International Conference on Underwater Acoustics 2024 ; Bath, UK ; June 17–20, 2024
Series or journal
Institute of Acoustics : Proceedings
Periodical volume
46
Periodical issue
1
Part of the university bibliography
✅
DDC Class
620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Keyword
Underwater sound
Radiation measurement
Beam steering
Active coating
Abstract
Sources for underwater sound with large dimensions l, such as a coating on a boat structure, can be suitable for generating low-frequency underwater sound. In this context, low-frequency refers to wavelength λ in water that fall within the range of 40 l>λ>1,5 l . Such low-frequency sources can be applicable for a wide variety of long-range applications, such as communication, navigation and sonar.
In this study, an array of 18 circular piezoelectric actuators embedded in a potting compound create an active surface for generating underwater sound. The coating is attached to a plane plate of glass-fiber reinforced plastic, typical for maritime applications. The acoustic propagation is investigated in an underwater test range with free field conditions, specifically for low frequencies. This study focuses on sound radiation and beam steering behaviour (in terms of propagation and vibroacoustics). On the one hand, the test results show the strongly frequency-dependent performance of the coating as an underwater sound source. On the other hand, a significant influence of the vibroacoustic behavior on the sound radiation can be recognized. The beam steering experiment reveals the phase shifts, up to which the coating still emits sound without major losses.
In this study, an array of 18 circular piezoelectric actuators embedded in a potting compound create an active surface for generating underwater sound. The coating is attached to a plane plate of glass-fiber reinforced plastic, typical for maritime applications. The acoustic propagation is investigated in an underwater test range with free field conditions, specifically for low frequencies. This study focuses on sound radiation and beam steering behaviour (in terms of propagation and vibroacoustics). On the one hand, the test results show the strongly frequency-dependent performance of the coating as an underwater sound source. On the other hand, a significant influence of the vibroacoustic behavior on the sound radiation can be recognized. The beam steering experiment reveals the phase shifts, up to which the coating still emits sound without major losses.
Version
Published version
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