test results acoustic properties - pdf 208 KB - Vescom

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Annette Douglas Textiles ACOUSTICS ® , curtain Formoza,100% fullness, mean mounting distance 150 mmPhotographand schematic verticalcut of the setup in thereverberation chamber90 mmCurtain Formoza, draped185 mmmean mountingdistance 150 mmreverberation chamber floorAnnette Douglas Textiles AG, CH-5430 Wettingen
EmpaÜberlandstrasse 129CH-8600 DübendorfT +41 44 823 55 11F +41 44 821 62 44www.empa.chMaterials Sci ence & Technolog yVescom B.V.Postbus 70NL-5750 AB DeurneHollandTest ReportNo. 207872.3.Rint. Nr. 617.5753Assignment:Measurement of the sound absorption coefficient(reverberation room method) in accordancewith Standard EN ISO 354Test object:Annette Douglas Textiles ACOUSTICS ® , curtain Formoza,0% fullness, mounting distance 150 mm(Layout: see sketch, page 2)Client Reference:Mrs. A. DouglasDate of assignment: 01.01.2010Receipt of test object: 25.02.2011 EMPA reference: 575303Installation of test object: 28.02.2011 Performed by: R. PierenExecution of test: 28.02.2011 Performed by: R. DiggelmannNumber of pages: 2Attachments:1: Fundamentals, Calculations2: Test FacilityThe measurement of the sound absorption of absorbing materials as well as the data analysis and determinationof the sound absorption coefficient αs is described in Standard EN ISO 354 (2003). Details of themeasurement procedure, the test layout, installation and dimensions of the test facility (reverberationroom), a list of the measurement equipment and the respective calibration dates are to be found in theinternal Quality Assurance Document SOP-177-6 (Nr. 1059).The description of the object and the results are presented on page 2. The numerical data represent theofficial values. These values are limited to the objects actually measured in the EMPA facility; they cannotnecessarily be applied to a series.The measurement accuracy for αs is given as the standard deviation as a function of frequency in accordancewith previous experience for the equipment employed:Low frequency range 100 - 250 Hz: +/- 0.1; Middle frequency range 315 - 800 Hz: +/- 0.05;High frequency range 1000 - 5000 Hz: +/- 0.02.In the reverberation chamber a test area of 3m x 4m was fixed on a closed frame of height 150 mm.Reprint of the test report of 21. March 2011Swiss Federal Laboratories for Materials Testing and Research, Laboratory of AcousticsDübendorf, 18. May 2012Vice Head of Laboratory:R. BütikoferHead of Laboratory:K. EggenschwilerSTS 068The test results are valid solely for the tested object. The use of the test report for advertizing purposes, any reference to it or thepublication of excerpts require the approval of the Empa (see Information Sheet). Test reports and supporting documents areretained for 10 years.
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test results acoustic properties - pdf 208 KB - Vescom

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