Please use this identifier to cite or link to this item:
For citation please use:
Main Title: Experimental Study of Advanced Helmholtz Resonator Liners with Increased Acoustic Performance by Utilising Material Damping Effects
Author(s): Dannemann, Martin
Kucher, Michael
Kunze, Eckart
Modler, Niels
Knobloch, Karsten
Enghardt, Lars
Sarradj, Ennes
Höschler, Klaus
Type: Article
Language Code: en
Abstract: In aero engines, noise absorption is realised by acoustic liners, e.g., Helmholtz resonator (HR) liners, which often absorb sound only in a narrow frequency range. Due to developments of new engine generations, an improvement of overall acoustic damping performance and in particular more broadband noise absorption is required. In this paper, a new approach to increase the bandwidth of noise absorption for HR liners is presented. By replacing rigid cell walls in the liner’s honeycomb core structure by flexible polymer films, additional acoustic energy is dissipated. A manufacturing technology for square honeycomb cores with partially flexible walls is described. Samples with different flexible wall materials were fabricated and tested. The acoustic measurements show more broadband sound absorption compared to a reference liner with rigid walls due to acoustic-structural interaction. Manufacturing-related parameters are found to have a strong influence on the resulting vibration behaviour of the polymer films, and therefore on the acoustic performance. For future use, detailed investigations to ensure the liner segments compliance with technical, environmental, and life-cycle requirements are needed. However, the results of this study show the potential of this novel liner concept for noise reduction in future aero-engines.
Issue Date: 15-Oct-2018
Date Available: 9-Aug-2019
DDC Class: 600 Technik, Technologie
Subject(s): acoustic liner
broadband noise
Helmholtz resonator
honeycomb sandwich panel
Journal Title: Applied Sciences
Publisher: MDPI
Publisher Place: Basel
Volume: 8
Issue: 10
Article Number: 1923
Publisher DOI: 10.3390/app8101923
EISSN: 2076-3417
Appears in Collections:FG Technische Akustik » Publications

Files in This Item:
Format: Adobe PDF | Size: 4.92 MB
DownloadShow Preview

Item Export Bar

This item is licensed under a Creative Commons License Creative Commons