Simulation and measurement of a Helmholtz resonance based acoustic metamaterial for military vehicle application

Clasen, Michael Dominik; Passemard, Clément; Sachau, Delf

doi:10.1121/2.0002233

Simulation and measurement of a Helmholtz resonance based acoustic metamaterial for military vehicle application

Translated title

Simulation und Messung eines Helmholtz-Resonanz basierten akustischen Metamaterials für die Anwendung an einem Militärfahrzeug

Publication date

2026-02-25

Document type

Konferenzbeitrag

Author

Clasen, Michael Dominik

Passemard, Clément

Sachau, Delf

Editor

Clasen, Michael Dominik

Organisational unit

Mechatronik

DOI

10.1121/2.0002233

URI

https://openhsu.ub.hsu-hh.de/handle/10.24405/22325

Conference

188th Meeting of the Acoustical Society of America joint with 25th International Congress on Acoustics ; New Orleans, LA, USA ; May 18–23, 2025

Publisher

Acoustical Society of America (ASA)

Series or journal

Proceedings of Meetings on Acoustics

ISSN

1939-800X

Periodical volume

56

Periodical issue

1

Article ID

045008

Part of the university bibliography

✅

Language

English

Abstract

In the military vehicle, automotive sector, the acoustic emission of internal combustion engines has a significant impact on the environment. For example, engine fans or exhaust streams exhibit low frequency spectra with local maxima. These correspond either to the driving speed or to the idling mode, which is related to the finite amount of pistons in the engine. In the latter case, a stationary signal of the idling mode is analyzed for its local frequency peaks. In this approach, an acoustic metamaterial design based on the Helmholtz-resonance effect and a standard Helmholtz resonator design with four cavities and necks are developed and compared for the passive reduction of these narrowband frequencies. A pre-dimensioning in the geometric design of the cavities and necks is carried out, while a downscaling of the size is necessary for laboratory purposes. A simulation model is developed to investigate the absolute sound transmission loss as well as the relative improvement by the resonators subtracting the influence of acoustic phenomena by the test environment. The results are compared with experiments using 3D printed resonator prototypes inserted into an acoustic impedance tube. The results of this study show the potential for optimizing the sound emission in noise-sensitive regions.

Description

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (http://creativecommons.org/licenses/by-nc-nd/4.0).

Version

Published version

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