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Sound Transmission Loss of a Sandwich Plate with Adjustable Core Layer Thickness

Ehrig, Tom ; Dannemann, Martin ; Luft, Ron ; Adams, Christian ; Modler, Niels ; Kostka, Pawel (2022):
Sound Transmission Loss of a Sandwich Plate with Adjustable Core Layer Thickness. (Publisher's Version)
In: Materials, 13 (18), MDPI, e-ISSN 1996-1944,
DOI: 10.26083/tuprints-00015955,

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Sound Transmission Loss of a Sandwich Plate with Adjustable Core Layer Thickness
Language: English

Compressible Constrained Layer Damping (CCLD) is a novel, semi-active, lightweightcompatible solution for vibration mitigation based on the well-known constrained layer damping principle. The sandwich-like CCLD set-up consists of a base structure, a constraining plate, and a compressible open-cell foam core in between, enabling the adjustment of the structure’s vibration behaviour by changing the core compression using different actuation pressures. The aim of the contribution is to show to what degree, and in which frequency range the acoustic behaviour can be tuned using CCLD. Therefore, the sound transmission loss (TL), as an important vibro-acoustic index, is determined in an acoustic window test stand at different actuation pressures covering a frequency range from 0.5 to 5 kHz. The different actuation pressures applied cause a variation of the core layer thickness (from 0.9 d₀ to 0.3 d₀), but the resulting changes of the stiffness and damping of the overall structure have no significant influence on the TL up to approximately 1 kHz for the analysed CCLD design. Between 1 kHz and 5 kHz, however, the TL can be influenced considerably well by the actuation pressure applied, due to a damping-dominated behaviour around the critical frequency

Journal or Publication Title: Materials
Volume of the journal: 13
Issue Number: 18
Place of Publication: Darmstadt
Publisher: MDPI
Collation: 10 Seiten
Uncontrolled Keywords: sound transmission loss, semi-active damping, sandwich panel, morphing structure, compressible constrained layer damping, composite materials
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Research group System Reliability, Adaptive Structures, and Machine Acoustics (SAM)
Date Deposited: 09 Feb 2022 14:58
Last Modified: 07 Mar 2023 07:30
DOI: 10.26083/tuprints-00015955
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-159555
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/15955
PPN: 50556209X
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