Target echo strength of layered media with an active surface
Translated title
Zielmaß von geschichteten Medien mit einer aktiven Oberfläche
Publication date
2025
Document type
Konferenzbeitrag
Author
Organisational unit
Conference
8th Underwater Acoustics Conference and Exhibition (UACE2025) ; Ηalkidiki, Greece ; June 15–20, 2025
Publisher
FORTH - Institute of Applied & Computational Mathematics
Book title
UACE 2025 Conference Proceedings
First page
335
Last page
341
Part of the university bibliography
✅
Language
English
DDC Class
600 Technik, Technologie
Keyword
Active coating
Active impedance control
Underwater sound
Analytical model
Abstract
Layered media, in form of both fluid layers and solid structures, play an important role in underwater acoustics. Typical applications are acoustic windows for sonar systems or absorption layers for submarines. However, the either desired total absorption, total reflection or total transmission is not achieved in practice. The vibro-acoustic behaviour of an object plays a particularly important role in the resulting target echo strength. Active surfaces, for example made of piezo-ceramics, increase the possibilities of influencing the target echo strength beyond the geometry, material properties and material composition of the layer.\nThis study compares the target strength behaviour of different layered media including active surfaces for underwater applications. An analytical model is used to estimate the reflection and transmission behaviour. When the reflection of a surface is minimized by an active coating, the transmission increases significantly. This is a particular problem in layered media, as the transmitted sound waves can cause subsequent layers and structures to vibrate and thus increase the total target echo strength. Various countermeasures are being investigated to prevent this.
Description
Presented on June 16, 2025
Version
Published version
Access right on openHSU
Metadata only access