Development of an optimised, standard-compliant procedure to calculate sound transmission loss: Numerical measurements

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dc.contributor.author Papadopoulos, CI en
dc.date.accessioned 2014-03-01T01:18:52Z
dc.date.available 2014-03-01T01:18:52Z
dc.date.issued 2003 en
dc.identifier.issn 0003682X en
dc.identifier.uri http://hdl.handle.net/123456789/15235
dc.subject Acoustics en
dc.subject Finite Element Analysis en
dc.subject Optimisation en
dc.subject Standard en
dc.subject Transmission Loss en
dc.subject.other Boundary conditions en
dc.subject.other Finite element method en
dc.subject.other Sound insulating materials en
dc.subject.other Dynamic coupling en
dc.subject.other Acoustic wave transmission en
dc.title Development of an optimised, standard-compliant procedure to calculate sound transmission loss: Numerical measurements en
heal.type journalArticle en
heal.identifier.primary 10.1016/S0003-682X(03)00066-5 en
heal.identifier.secondary http://dx.doi.org/10.1016/S0003-682X(03)00066-5 en
heal.publicationDate 2003 en
heal.abstract Availability of low-frequency characteristics of sound insulating elements is required in order to achieve efficient control of noise sources and reduced level of annoyance in the low-frequency range. Previous work by the author has addressed the problem of designing an enhanced calculation environment for the estimation of sound Transmission Loss (TL). In this work, numerical prediction of TL of sound insulating structures is performed using a procedure, which is in compliance with the ISO recommendations for acoustic measurements. The room-structure-room finite element representation, employed to solve sound propagation and sound-structure interaction problems, as well as the dynamic coupling of and the sound energy propagation through successive air-structure layers are investigated. Several cases of single-layered plain structures of common sound insulating materials such as steel, glass and aluminium with various thickness values are modelled and the calculated TL is compared with published experimental results. It is shown that although the detailed dynamic response of the structures is not accurately predicted due to uncertain parameters, such as the test-specimens dimension and vaguely known boundary conditions, the octave band averaged TL is sufficiently predicted for the majority of the tested materials. Extension of the method to multi-layered structures is attempted and discrepancies at low frequencies are depicted. Finally, the effect of poor mode distribution of the measurement rooms upon the estimated TL is examined in focus. Comparison is performed between TL values calculated with typical and intensely modified transmission rooms. The low-frequency improvement on measurements, when the second ones are used, is demonstrated. © 2003 Elsevier Ltd. All rights reserved. en
heal.journalName Applied Acoustics en
dc.identifier.doi 10.1016/S0003-682X(03)00066-5 en
dc.identifier.volume 64 en
dc.identifier.issue 11 en
dc.identifier.spage 1069 en
dc.identifier.epage 1085 en

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