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Airborne sound insulation of single and double plate constructions
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The sound insulation demands for dwellings and public building has increased over the years as the number of sound sources has grown. From the outside our homes are exposed to noise from cars, trains, airplanes, etc. Noise intrudes from our neighbours and their television and stereo equipments. Also noise from spaces for mechanical services systems tends to become more important due to increasing energy saving demands.

This thesis presents new analytical models for predicting the sound reduction index of single or double plate systems. In the single plate case, a theoretical and experimental analysis of the air-borne sound transmission through a single plate is presented. The plate is assumed to be excited by a diffuse sound field and the velocity distribution of the plate is derived from the Kirchoff plate equation in the frequency domain. The resulting Fourier transform is evaluated using residue calculus and the solution is verified numerically. The analytical model is valid for a wide frequency range, both below, above and at the critical frequency. Special interest is paid to the area dependency of the sound reduction index.

This technique is further expanded for the double plate case by adding another plate and an intermediate layer which is modelled as a locally reacting spring. The model is valid and continuous through both the mass-spring-mass resonance and the coincidence region. The results from the analytical models show good agreement with measured results in both the single and double plate case.

A simplified model is also presented for the sound reduction index of finite size floating floors. The model is valid for two elastic plates with a resilient layer in between where the bottom plate, the load-bearing slab, is assumed to be excited with a diffuse airborne sound field. The top plate and the resilient layer compose the floating floor. The problem is solved for frequencies below, between and above the critical frequencies of the plates. Above the critical frequency of the load-bearing plate, but below that of the floating slab, the main coupling between the plates will occur at the coincidence angle of the load-bearing plate. Above the critical frequency of both plates, the main transmission will occur at the angle of coincidence of each plate. As the plates will interact, the sound insulation improvement will to some extent depend on the properties of the load-bearing slab. It is shown how the sound reduction index depends on the physical parameters and the geometry of the plates.

Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 22 p.
Keyword [en]
Construction engineering, : Airborne sound insulation, single plate, double plate, floating-floor, sound reduction index, sound transmission.
Keyword [sv]
Byggnadsteknik
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:kth:diva-182ISBN: 91-7178-011-4 (print)OAI: oai:DiVA.org:kth-182DiVA: diva2:7831
Public defence
2005-04-29, Sal V1, Tekniklingen 76, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20101101Available from: 2005-04-27 Created: 2005-04-27 Last updated: 2011-06-16Bibliographically approved
List of papers
1. Airborne Sound Insulation of a Thin Plate of Finite Dimensions
Open this publication in new window or tab >>Airborne Sound Insulation of a Thin Plate of Finite Dimensions
2005 (English)In: Acta Acoustica united with Acustica, ISSN 1610-1928, E-ISSN 1861-9959, Vol. 91, no 4, 732-739 p.Article in journal (Refereed) Published
Abstract [en]

An analytical model for predicting the sound reduction index of a single plate is presented. The plate is assumed to be excited by a diffuse sound field and the velocity distribution of the plate is derived from the Kirchoff plate equation in the frequency domain. The resulting Fourier transform is evaluated using residue calculus and the solution is verified numerically. The analytical model is valid for a wide frequency range, both below, above and at the critical frequency. Special interest is paid to the area dependency of the sound reduction index. Calculated results are presented for a 0.5 m(2), 1.7 m(2) and 4.4 m(2) plate of 16 rum chipboard. These results, which agree well with measured values, show that the sound reduction index decreases with increasing area in the whole frequency range.

Keyword
acoustic insulation, panel walls, single, transmission, radiation
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-5076 (URN)000230803000014 ()2-s2.0-23044495946 (Scopus ID)
Note
Uppdaterad från "submitted" till published: 20101101. QC 20101101Available from: 2005-04-27 Created: 2005-04-27 Last updated: 2017-12-05Bibliographically approved
2. Sound Insulation of a Single Plate: A Discussion on the Area Dependency of the Sound Reduction Index
Open this publication in new window or tab >>Sound Insulation of a Single Plate: A Discussion on the Area Dependency of the Sound Reduction Index
2004 (English)In: The 33rd International Congress and Exposition on Noise Control Engineering., 2004, 1-8 p.Conference paper, Published paper (Refereed)
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-5077 (URN)
Conference
Inter-Noise 2004, Prag, Tjeckien, 22/8-25/8 2004.
Note
QC 20101101Available from: 2005-04-27 Created: 2005-04-27 Last updated: 2010-11-01Bibliographically approved
3. Airborne Sound Insulation of Floating Floors
Open this publication in new window or tab >>Airborne Sound Insulation of Floating Floors
2001 (English)In: Acustica, ISSN 0001-7884, Vol. 87, no 2, 215-225 p.Article in journal (Refereed) Published
Abstract [en]

An analytical model is presented for the sound reduction index of finite size floating floors. The model consists of two elastic plates with a resilient layer in between. The bottom plate, the load-bearing slab, is assumed to be excited with a diffuse airborne sound field. The top plate and the resilient layer compose the floating floor. The problem is solved for frequencies below, between and above the critical frequencies of l:he plates. Above the critical frequency of the load-bearing plate, but below that of the floating slab, the main coupling between the plates will occur at the coincidence angle of the load-bearing plate. Above the critical frequency of both plates, transmission will occur at the angle of coincidence of each plate. As the plates will interact, the sound insulation improvement will to some extent depend on the properties of the load-bearing slab. In the article it is shown how the sound reduction index depends on the physical parameters and the geometry of the plates.

National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-5078 (URN)000169170700008 ()
Note
QC 20101101Available from: 2005-04-27 Created: 2005-04-27 Last updated: 2017-12-05Bibliographically approved
4. Acoustic Properties of Double Plate Systems, Part I: An Analytical Model
Open this publication in new window or tab >>Acoustic Properties of Double Plate Systems, Part I: An Analytical Model
(English)Article in journal (Other academic) Submitted
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-5079 (URN)
Note
QS 20120327Available from: 2005-04-27 Created: 2005-04-27 Last updated: 2012-03-27Bibliographically approved
5. Acoustic Properties of Double Plate Systems, Part II: The Sound Reduction Index of Finite-Size Thin Plates
Open this publication in new window or tab >>Acoustic Properties of Double Plate Systems, Part II: The Sound Reduction Index of Finite-Size Thin Plates
(English)Article in journal (Other academic) Submitted
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-5080 (URN)
Note
QS 20120327Available from: 2005-04-27 Created: 2005-04-27 Last updated: 2012-03-27Bibliographically approved

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