WIT Press


Prediction Of Impact Sound Isolation And Transmission Loss: Analytical Expressions Versus A BEM Approach

Price

Free (open access)

Paper DOI

10.2495/BE030241

Volume

35

Pages

12

Published

2003

Size

520.65 kb

Author(s)

A. Pereira & A. Tadeu

Abstract

Prediction of impact sound isolation and transmission loss: analytical expressions versus a BEM approach A, Pereira & A. Tadeu Department of Civil Engineering, Coimbra University, Portugal Abstract The behavior of partitions when excited either by pressure loads or by impact loads is analyzed by means of two numerical tools, namely, Green's functions and the Boundary Element Method. Two models are used to help understand sound transmission loss, impact sound insulation and the relation between them. The first model assumes that a panel divides an infinite acoustic medium, whereas the second model considers a clamped panel dividing two closed acoustic spaces. The analysis is performed in the frequency domain using twodimensional geometries excited by cylindrical line loads. Results are discussed and compared with simplified expressions. The importance of certain features of sound propagation, such as the coincidence effect, the stationary field and vibration characteristics of the partition, is

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