Comparison of actuator concepts for reducing sound reflection from an underwater surface
Translated title
Vergleich von Aktorkonzepten zur Reduzierung der Schallreflexion einer Unterwasser-Fläche
Publication date
2025
Document type
Konferenzbeitrag
Organisational unit
Conference
51st Annual Meeting on Acoustics (DAS|DAGA 2025) ; Copenhagen, Denmark ; March 17–20, 2025
Publisher
Deutsche Gesellschaft für Akustik e.V. (DEGA)
Book title
Proceedings of DAS|DAGA 2025
First page
912
Last page
915
Part of the university bibliography
✅
Language
German
DDC Class
600 Technik, Technologie
Keyword
Underwater sound
Active impedance control
Active coating
Wasserschall
Aktor
Abstract
From a strategic point of view, it is necessary to protect underwater vehicles from reconnaissance. Modern sonar systems are capable of determining the exact position of those vehicles. They do this by emitting signals that reflect off the surface of the vehicles, which are then detected and evaluated. At low frequencies, reflection can be reduced by using an active system. The incoming sound waves are measured in front of the surface and then processed by a control system. The system drives an actuator applied to the surface that minimizes the reflection. Three different actuator concepts are compared in this study: First, a 3-3 mode piezoceramic patch transducer attached to steel; second, a bending actuator embedded in foam; and third, a multilayer structure made of Poly(vinylidenfluorid-Trifluorethylen) (PVDF-TrFE) film. Measurements in laboratory tests show the different characteristics of the actuators under the influence of sonar-like signals and under hydrostatic pressure from 1 to 40 bar.
Version
Published version
Access right on openHSU
Metadata only access