Development of an optimised, standard-compliant procedure to calculate sound transmission loss: Design of transmission rooms

Papadopoulos, CI

dc.contributor.author	Papadopoulos, CI	en
dc.date.accessioned	2014-03-01T01:17:42Z
dc.date.available	2014-03-01T01:17:42Z
dc.date.issued	2002	en
dc.identifier.issn	0003682X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14630
dc.subject	Finite Element	en
dc.subject	First Principle	en
dc.subject	Numerical Simulation	en
dc.subject	Quality Criteria	en
dc.subject	Standardisation	en
dc.subject	Steady State	en
dc.subject	Virtual Laboratory	en
dc.subject	Low Frequency	en
dc.subject	Reverberation Time	en
dc.subject	Sound Transmission Loss	en
dc.subject	Transmission Loss	en
dc.subject.other	Acoustic variables measurement	en
dc.subject.other	Acoustics laboratories	en
dc.subject.other	Computer simulation	en
dc.subject.other	Finite element method	en
dc.subject.other	Optimization	en
dc.subject.other	Reverberation	en
dc.subject.other	Sound insulating materials	en
dc.subject.other	Sound transmission loss	en
dc.subject.other	Acoustic wave transmission	en
dc.title	Development of an optimised, standard-compliant procedure to calculate sound transmission loss: Design of transmission rooms	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0003-682X(02)00005-1	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0003-682X(02)00005-1	en
heal.publicationDate	2002	en
heal.abstract	A numerical procedure to estimate the transmission loss of sound insulating structures is proposed based upon the technology of acoustic measurements and standards. A virtual laboratory (VL), namely, a numerical representation of a real laboratory consisting of two reverberation rooms meeting certain sound field quality criteria is designed. VL is to be used for the numerical simulation of standardised measurements under predefined, controlled, acoustic conditions. In this paper, the design and optimisation of VL is investigated. The geometry of the transmission rooms is designed following first principles, in order for diffuse field conditions and sufficiently smooth primary mode distribution in the low frequency to be achieved. A finite element-based optimisation procedure, introduced by the author in previous work, is extended to arbitrarily shaped rooms. It is used to predict the appropriate local geometric modifications so as for improved mode distribution and smoother sound pressure fluctuations of the transmission rooms in the low-frequency range to be achieved and low-frequency measurement reproducibility and accuracy to be increased. Steady-state acoustic response analysis is performed in order to quantify the acoustic field quality of the virtual transmission rooms in the frequency range of measurements. A method to calculate the total absorption, A, of the receiving room is introduced by simulation of the reverberation time measurement procedure using Transient acoustic response analysis. The acoustic performance of VL is overall considered and is shown to meet in a sufficient degree, relative laboratory measurement standards in the frequency range of 100÷704 Hz. © 2002 Elsevier Science Ltd. All rights reserved.	en
heal.journalName	Applied Acoustics	en
dc.identifier.doi	10.1016/S0003-682X(02)00005-1	en
dc.identifier.volume	63	en
dc.identifier.issue	9	en
dc.identifier.spage	1003	en
dc.identifier.epage	1029	en