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Modal-interaction approach to the strong structural–acoustic coupling of an elastic Helmholtz resonator and an acoustic cavity containing a heavy fluid
ID Oblak, Miša (Author), ID Pirnat, Miha (Author), ID Boltežar, Miha (Author)

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Abstract
This paper focuses on the development of a method for the accurate representation of the strong structural–acoustic coupling between an elastic Helmholtz resonator, a heavy fluid and an impedance tube. The Helmholtz resonator has an elastic wall and is connected to the impedance tube, yielding a system with two acoustic cavities coupled through a neck and the fluid–structure interaction between a liquid medium and a plate. The proposed analytical formulation is based on the modal superposition method in combination with a lumped parameter model of the neck. The effect of the evanescent waves is taken into account in the form of both the inertial attached length of the neck and the terms of the evanescent pressure modes in the governing equations, which are omitted in other methods. The formulation of the evanescent pressure field is redefined to include the reflected waves, thus expanding the application to the acoustic cavity of an arbitrary shape. Strong coupling between the heavy fluid and the plate is accomplished with the implementation of the non-resonant acoustic modes. Furthermore, the improved performance of the model for moderately thick plates is achieved with the combined approach of the Mindlin–Reissner theory mode shapes and the Kirchhoff–Love theory governing equations. The proposed model is validated with FEA simulations of three different resonator configurations and compared to other applicable methods. The results demonstrate substantially increased accuracy in the predicted response of the coupled structural–acoustic system.

Language:English
Keywords:modal-interaction, fluid–structure interaction, structural–acoustic coupling, Mindlin plate, Kirchhoff plate, heavy fluid, Helmholtz resonators, impedance tube
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2022
Number of pages:17 str.
Numbering:Vol. 535, art. 117120
PID:20.500.12556/RUL-137580 This link opens in a new window
UDC:531/533
ISSN on article:0022-460X
DOI:10.1016/j.jsv.2022.117120 This link opens in a new window
COBISS.SI-ID:112492035 This link opens in a new window
Publication date in RUL:22.06.2022
Views:671
Downloads:137
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Record is a part of a journal

Title:Journal of sound and vibration
Shortened title:J. Sound Vib.
Publisher:Elsevier
ISSN:0022-460X
COBISS.SI-ID:540946 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:strukturne analize, strukturna mehanika, modalne povezave

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