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Improved models for the prediction of sound transmission through partitions at low frequencies

Improved models for the prediction of sound transmission through partitions at low frequencies
Improved models for the prediction of sound transmission through partitions at low frequencies

Although the phenomenon of sound transmission through partitions has been investigated over many years, the problem of low frequency sound insulation in buildings is still an active research area.  Modal methods are widely used for the low-frequency analysis of vibro-acoustic problems, including the problem of sound transmission between coupled rooms. A generic modal model is developed and implemented for better representation of the airborne sound transmission in buildings.  Subsequently, the model is validated experimentally and showed good agreement when compared to previously published results.

This model also provided some information in terms of the variability and sensitivity of sound insulation parameters (e.g. the Noise Reduction) to the geometry and material properties of the system.

The effects of the imposition of common velocity on the acoustic-structural interface have been incorporated using a novel development of the Component Model Synthesis Method (CMS). The formulation of the structural-acoustic problem in terms of ‘components’ is described. The results obtained via the CMS method are then compared to those obtained using both a one-dimensional wave approach and the standard modal analysis for a one dimensional acoustic system.  Very good agreement was found between the one-dimensional wave model and the CMS model. Finally, the CMS approach is developed and extended to three-dimensional acoustic systems. Results are provided for the case of an elastic partition coverage of a common interface.

University of Southampton
De Castro Magalhaes, Max
90b49784-3dc1-4f9a-a031-389fc205e264
De Castro Magalhaes, Max
90b49784-3dc1-4f9a-a031-389fc205e264

De Castro Magalhaes, Max (2004) Improved models for the prediction of sound transmission through partitions at low frequencies. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

Although the phenomenon of sound transmission through partitions has been investigated over many years, the problem of low frequency sound insulation in buildings is still an active research area.  Modal methods are widely used for the low-frequency analysis of vibro-acoustic problems, including the problem of sound transmission between coupled rooms. A generic modal model is developed and implemented for better representation of the airborne sound transmission in buildings.  Subsequently, the model is validated experimentally and showed good agreement when compared to previously published results.

This model also provided some information in terms of the variability and sensitivity of sound insulation parameters (e.g. the Noise Reduction) to the geometry and material properties of the system.

The effects of the imposition of common velocity on the acoustic-structural interface have been incorporated using a novel development of the Component Model Synthesis Method (CMS). The formulation of the structural-acoustic problem in terms of ‘components’ is described. The results obtained via the CMS method are then compared to those obtained using both a one-dimensional wave approach and the standard modal analysis for a one dimensional acoustic system.  Very good agreement was found between the one-dimensional wave model and the CMS model. Finally, the CMS approach is developed and extended to three-dimensional acoustic systems. Results are provided for the case of an elastic partition coverage of a common interface.

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Published date: 2004

Identifiers

Local EPrints ID: 465240
URI: http://eprints.soton.ac.uk/id/eprint/465240
PURE UUID: a9b57c85-3bed-43cc-9855-f89c0b5656b4

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Date deposited: 05 Jul 2022 00:31
Last modified: 26 Oct 2023 01:47

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Author: Max De Castro Magalhaes

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