Sound Diffusers with Fabric Covering

Kamisiński, Tadeusz; Brawata, Krzysztof; Pilch, Adam; Rubacha, Jarosław; Zastawnik, Marcin

doi:10.2478/v10168-012-0040-5

Cited by 14 publications

(8 citation statements)

References 10 publications

(5 reference statements)

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“…According to the present authors' paper [8] it is worth noting that few unpredictable problems might occur. In the case of incorrect distance between both arrays, interfering waves may disturb the frequency response in the pass band.…”

Section: Double-layer Arraymentioning

confidence: 99%

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Narrow Frequency Range Problem of Sound Reflector Arrays

2013

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Overhead stage canopies composed of many panels suspended under ceiling provide proper acoustic eld in concert halls and auditoria. The purpose of using these structures is adequate direction and partial dispersion of sound reected from them. Frequency range of sound reected from at panels closely depends on their shape, size and conguration. It is often too narrow and therefore insucient for the proper sound of the interior. Mutual dependence of the lower and upper frequency limit of sound transmission requires the search for other ways to improve these structures. The paper proposes some solutions concerning spatial structures which have not been yet dened. An attempt was made to determine the useful frequency band of sound transmitted through such reective structures.

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Section: Double-layer Arraymentioning

confidence: 99%

“…A natural step further would be to investigate the behavior of curved panels and compare frequency responses of at, convex and circle elements. One should also study fractal and wavy reector arrays or panels with diusers mounted on them [9].…”

Section: Conclusion and Further Workmentioning

confidence: 99%

Narrow Frequency Range Problem of Sound Reflector Arrays

2013

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“…The arrangements of seats in an auditorium is a spatial structure in that the large number of protruding edges increases the absorption of the entire auditorium as compared to the absorption capacity of a single seat. The research conducted by Pilch (2011) and Kamisiński et al (2012) on sound diffusers showed that sound absorption by spatial structures depends on their material properties and geometry, especially at low frequencies.…”

Section: Introductionmentioning

confidence: 99%

Measurements of the Sound Absorption Coefficient of Auditorium Seats for Various Geometries of the Samples

Rubacha¹,

Pilch²,

Zastawnik³

2012

Archives of Acoustics

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This paper presents the results of measurements of the sound absorption coefficient of auditorium seats carried out in the laboratory using two methods. In the first one, small blocks of seats in various arrangements were studied in a reverberation chamber to determine the absorption coefficient of an auditorium of infinite dimensions. The results were compared to the values of the absorption coefficient measured using the second method, which involved samples enclosed within a frame screening the side surfaces of other auditorium blocks. The results of both methods allowed for the assessment of the sound absorption coefficient of an auditorium of any dimensions while taking into account the sound absorption by the side surfaces. The method developed by the authors will simplify the currently known measurement procedures.

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“…that, averaged over the whole half-space, can be considered as the sound wave absorption coecient uniformly distributed incidence [11]:…”

Section: Introductionmentioning

confidence: 99%

“…The output acoustic impedance for the fabric hanged at a distance d 1 from a perfectly rigid wall can be expressed as [11]:…”

Section: Introductionmentioning

confidence: 99%

The Application of Double-layer Curtains for Shaping Acoustics of Concert Halls

et al. 2014

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Requirements concerning adjustment of acoustical parameters are nowadays more and more frequently numbered among design assumptions adopted for newly constructed concert halls and other auditoriums planned to play dierent functions. Investors usually require that the newly designed interiors can be used for such dierent purposes as playing orchestral music, performing theatre spectacles, screening movies, or holding lectures. This means the necessity to undertake studies on new technologies allowing to excert eective control over acoustics of multipurpose auditoriums. This paper proposes to use acoustic curtains as an eective means of modication of acoustic absorptivity of rooms. A design solutions for such curtains is described together with basics of the theory allowing to predict their acoustic properties. Results of sound absorption coecient calculations performed for selected systems on the grounds of airow resistivity values assumed for the used fabrics are veried by means of results of measurements performed in the impedance tube. It is proven that double-layer curtains show more balanced sound absorption characteristics compared to single-layer curtains and therefore represent a more convenient option when used for acoustical adaptation of rooms. Based on model studies, design solutions with double-layer curtains is developed for two concert halls that allow to adjust acoustic properties of the interiors to the required functions.

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Sound Diffusers with Fabric Covering

Cited by 14 publications

References 10 publications

Narrow Frequency Range Problem of Sound Reflector Arrays

Narrow Frequency Range Problem of Sound Reflector Arrays

Measurements of the Sound Absorption Coefficient of Auditorium Seats for Various Geometries of the Samples

The Application of Double-layer Curtains for Shaping Acoustics of Concert Halls

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