Experiments with coated surfaces to generate sound waves in water
Translated title
Experimente mit beschichteten Oberflächen zur Erzeugung von Schallwellen im Wasser
Publication date
2024-11-14
Document type
Konferenzbeitrag
Author
Organisational unit
ISSN
Conference
185th Meeting of the Acoustical Society of America ; Sydney, Australia ; December 4–8, 2023
Periodical volume
52
Part of the university bibliography
✅
DDC Class
620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Keyword
Underwater sound
Active coating
Piezoelectric actuator
Abstract
Sources for underwater sound have a wide range of applications, such as active sonar, navigation, and underwater communication. Particularly, sources 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 the range of 0.15 ≤ He ≤ 4.5 with Helmholtz number He = kl. In this study, a sample of an active surface for generating underwater sound is created by attaching an array of 18 circular piezoelectric actuators to a glass-fiber reinforced plastic (GRP) plate as substrate for the coating. The array is coated with an impedance matching layer. The radiation characteristics of the active surface are investigated in an underwater test range with nearly free field conditions. The setup shows suitability for generating low frequency sound, although the vibroacoustic behaviour of the plate has a significant influence on the generated sound pressure. Depending on the frequency range, the sound pressure is either exponentially or linearly dependent on He. The active coating on the GRP-plate proved to be working as expected. For further investigations and improvements, the deviations between the mathematical model and the real behavior of the array must be investigated more intensively.
Description
This is a companion to: https://doi.org/10.1121/10.0023778
Version
Published version
Access right on openHSU
Metadata only access