Calculation Of Absorption Coefficients According To .

Industrial, Environmental and Architectural Acoustical research unit26, rue Paul Doumer BP 71659 657 Villeneuve d'AscqFrancewww.sim-engineering.comTel. 33 (0)3 20 05 88 55Fax 33 (0)3 20 05 88 60Calculation of absorption coefficientsAccording to standards NF EN ISO 11654 (NF S 31064), NF EN ISO 354 and ASTM C-423Type :Trademark :Vinyl 340/360 g/m²TEXDECORSupport :Sample glued to BA13 plateRef. SIM :Date :TemperatureSample areaRoom volumeDeducted celerityαw :138G04 - 704/02/20051512192339.4 Cm²m3m/sAbsorption index NRC :0.100.10Measuring tableFréquencies [Hz]125250500100020004000TR Empty [s]4.046.097.416.725.573.68TR laid down [s]3.935.475.715.134.583.24Coef. α0.020.050.100.120.100.09GraphicAbsorption 100.100.020.001250.120.100.05250500Frequencies in Hz100020000.094000

Laboratory for AcousticsDetermination of the sound absorption(reverberation room method) of a vinylwallcovering, manufacturer TexdecorReport number A 3151-1E-RA-001 d.d. January 13, 2017

Laboratory for AcousticsDetermination of the sound absorption (reverberationroom method) of a vinyl wallcovering, manufacturerTexdecorReport numberTexdecorS i è g e s o c i a l 2 r u e d 'H e m59780 WillemsFranceA 3151-1E-RA-001DateJanuary 13, 2017ReferenceTS/RA/KS/A 3151-1E-RA-001RepresentativeTh.W. ScheersAuthorR.T. AllanPrincipal 31 24 3570749r.allan@peutz.nlpeutz bv, postbus 66, 6585 zh mook, 31 24 357 07 07, info@peutz.nl, www.peutz.nlAll orders are accepted and executed according to 'De Nieuwe Regeling 2011' (The New Rules)BTW NL004933837B01 KvK: 12028033mook – zoetermeer – groningen – düsseldorf – dortmund – berlijn – leuven – parijs – lyon – sevillaA 3151-1E-RA-001 2

Ta b l e o f c o n t e n t s1Introduction42Standards and guidelines53Te s t e d c o n s t r u c t i o n64Measurements74.1 Method74.2 Accuracy84.3 Environmental conditions during the measurements94.4 Results9A 3151-1E-RA-001 3

1IntroductionAt the request of Texdecor based in Willems (France), laboratory measurements of the soundabsorption (reverberation room method) were carried out on:vinyl wallcoveringmanufacturer Texdecorin the Laboratory for Acoustics of Peutz bv, at Mook, the Netherlands (see figure 1).For these type of measurements the Laboratory for Acoustics has been accredited by theDutch Accreditation Council (RvA).The RvA is member of the EA MLA (EA MLA: European Accreditation OrganisationMultiLateral Agreement: http://www.european-accreditation.org).EA: “Certificates and reports issued by bodies accredited by MLA and MRA members areconsidered to have the same degree of credibility, and are accepted in MLA and MRA countries.”A 3151-1E-RA-001 4

2Standards and guidelinesThe measurements have been carried out according to the Quality Manual of the Laboratoryfor Acoustics aswell as:ISO 354:2003 1NOTE:Acoustics Measurement of sound absorption in a reverberation roomthis international standard has been accepted within all EU-countriesas European standard EN ISO 354:2003Various other related norms:EN ISO 11654:1997Acoustics Sound absorbers for use in buildings Rating of soundabsorptionASTM C423-09aStandard Test Method for Sound Absorption and Sound AbsorptionCoefficients by the Reverberation Room Method1 According to this norm, the report should include for each measurement the mean reverberation times T 1 and T2 ateach frequency. Because these figures are not relevant for judging the quality of the product being tested, butmerely for judging the accuracy of the calculations, they have been omitted in this report. It is possible of course toreproduce those figures at any time if the principal requests this.A 3151-1E-RA-001 5

3Te s t e d c o n s t r u c t i o nThe measurements have been carried out on the following material.Vinyl wallcoveringmanufacturer:Texdecorview side:Vinylback side:non-woven backingmass:345 gr/m2thickness:0,4 mmThe wall covering is tested on:1. concrete ( floor of the reverberation room)2. OSB Sheeting, thickness 15 mm, mass 8,8 kg/m 23. (closed) Gypsum board with glass wool at the back, thickness 12,5 mm 20 mm, mass14,5 kg/m2 (total, gypsum board with glass wool)4. perforated Gypsum board with glass tissue at the rear, thickness 12,5 mm, hole diameter20 mm c.t.c. distance 37,5 mm, mass 8,6 kg/m 2vinyl at panel 2vinyl at panel 3vinyl at panel 4The results as presented here relate only to the tested items and laboratory conditions asdescribed in this report. The laboratory can make no judgement about the representativity of thetested samples. The test report ahead is valid as long as the tested constructions and/ormaterials are unchanged.A 3151-1E-RA-001 6

4MeasurementsThe test specimen is placed directly against the floor of the reverberation room and/ormounted with an air space of 45 mm behind it.The perimeter edges of the test specimen are covered with an acoustical reflective frame,the facing side of the panels was up.The measurement setups are according to type B and E mounting, as described in annex B ofthe ISO 354:2003 (Test specimen mountings for sound absorption tests).4.1 M e t h o dThe tests were conducted in accordance with the provisions of the test method ISO 354 inthe reverberation room of “Peutz bv" in Mook (the Netherlands) (see figure 1). The relevantdata regarding the reverberation room are given in figure 2 of this report.By means of reverberation measurements the reverberation time of the room is measuredunder two conditions:– when the reverberation room is empty– when the construction under test is inside the reverberation roomIn general, once material is placed into the reverberation room a lower reverberation timewill result.The difference in reverberation times is a measure of the amount of absorption brought intothe room.Measurements and calculations were carried out in 1/3-octave bandwidth from 100 to5000 Hz, according to the norms. Where applicable the octave values have been calculatedfrom these 1/3-octave values.From the reverberation measurements in the empty reverberation room the equivalentsound absorption A1 is calculated (per frequency band) according to formula 1 andexpressed in m2A1 55,3 V 4V m1c T1in which:V the volume of the reverberation roomT1 the reverberation time in the empty reverberation roomm1 "power attenuation coefficient" in the empty room,calculated according to formulac the speed of sound in the air, in m/s, calculated according to(1)[m3][sec.][m-1][m/s]A 3151-1E-RA-001 7

c 331 0,6 tin which:t the temperature; this formula is valid for temperatures between 15 and 30 ºCm α10log(e)(2)[ C](3)in which:α "attenuation coefficient" according to ISO 9613-1In the same manner the equivalent sound absorption A2 for the room with the testspecimen is calculated according to formula 4, also expressed in m 2A2 55,3 V 4 V m2c T2in which:c and V have the same definition as in formula 1 andT2 the reverberation time of the reverberation room with the testspecimen placed insidem2 "power attenuation coefficient" in the room with the test specimenplaced inside, calculated according to formula 3(4)[sec][m-1]The equivalent sound absorption A of the test specimen has been calculated according toformula 5 and is expressed in m 2A A2 A1(5)When the test specimen consists of one plane with an area between 10 and 12 m 2 the soundabsorption coefficient αS has to be calculated according to formula 6:α ASin which:S the area of the test specimen(6)[m2]4.2 A c c u r a c yThe accuracy of the sound absorption as calculated can be expressed in terms ofrepeatability (tests within one laboratory) and reproducibility (between various laboratories).When:– two tests are performed on identical test material– within a short period of time– by the same person or team– using the same instrumentationA 3151-1E-RA-001 8

– under unchanged environmental conditionsthe probability will be 95% that the difference between the two test results will be less thanor equal to r.In order to evaluate the repeatability r for the sound absorption measurements performed inthe reverberation room of “Peutz bv" in Mook (the Netherlands) eight series ofmeasurements have been carried out according to ISO 354:1985 annex C. From the results ofthose measurements the repeatability r has been calculated. It was found that for thefrequency range from 100 to 200 Hz and at 5000 Hz the repeatability r is 0,21 as a maximum.For the frequency range 250 to 4000 Hz the repeatability r is 0,09 as a maximum.4.3 E n v i r o n m e n t a l c o n d i t i o n s d u r i n g t h e m e a s u r e m e n t sreverberation roomemptywith specimentemperature[ C]2323 - 24barometric pressure[kPa]101,2101,0 - 101,1relative humidity[%]5859 - 604.4 R e s u l t sThe results of the measurements are given in table 4.1 and 4.2 and in the figures 3 up to andincluding 8. The measurements were made in 1/3-octave bands. The results presented inoctave-bands are the arithmetic average of the results of the three 1/3-octave bandsbelonging to that octaveband. From those values the following one-figure ratings have beencalculated and stated : the "weighted sound absorption coefficient α w" according to ISO 11654; the "Noise Reduction Coefficient NRC" according to ASTM-C423, being the average of theabsorption coefficients (1/3 octave values) at the frequencies of 250, 500, 1000 and2000 Hz, rounded to the nearest 0,05; the "Sound Absorption Average SAA" according to ASTM-C423, being the average of theabsorption coefficients (1/3 octave values) at the frequencies of 200 Hz up to 2500 Hz,rounded to the nearest 0,01.A 3151-1E-RA-001 9

t4.1 measurement resultssound absorption coefficient asmeasurementvinyl on concretevinyl on OSBnonenone0,4 mm15 mmrecord nr.#73#258figure nr.34cavitytotal heightfrequency [Hz]1/3 oct.1/1 oct.1/3 00,1150000,151/1 aw0,050,15NRC0,000,10SAA0,010,12A 3151-1E-RA-001 10

t4.2 measurement resultssound absorption coefficient asmeasurementvinyl on closed gypsumvinyl on glossedvinyl on perforatedvinyl on perforatedboard with glass woolgypsum board withgypsum boardgypsum boardglass woolcavitynone45 mmnone45 mm32,5 mm77,5 mm12,5 mm57,5 mmrecord nr.#221#184#110#147figure nr.5678total heightfrequency [Hz]1/3 oct.1/1 oct.1/3 oct.1/1 oct.1/3 oct.0,30-0,011/1 oct.1/3 1/1 0,110,10The surface of the tested materials is in some cases less than the in the ISO 354 prescribedsurface area (between 10 and 12,6 m 2). In those cases the accuracy of the sound absorptioncoefficient is less than the in paragraph 4.2 given values (which are based on a surface areabetween 10 and 12,6 m2.A 3151-1E-RA-001 11

The sound absorption coefficient of a material is not a material property. It should be takeninto account that the sound absorption of a construction depends on the dimensions, theway of mounting of the material and its position in the room.Mook,Th. ScheersLaboratory Supervisordr. ir. M.L.S. VercammenManagerThis report contains 12 pages and 8 figures.A 3151-1E-RA-001 12

LABORATORY FOR ACOUSTICSPEUTZ bvLindenlaan 41, NL-6584 AC MOLENHOEK (LB), THE NETHERLANDSOVERVIEWairsupplyplenummeasurement of thereduction oftransmittedimpact noise(E)floorsilencersilencer(9)(8)waste waterStorylevel 2800 mmplenumair supply )receiving roomsending room(2)(1)sanitairyinstallationsopening (A) (closed)w x h 1300 x 1905 mmGround level(7)(4)wcshowerworkshopheatingsuspended ceilingsor raised floorsconferenceroomTEST OPENINGS (w x h in mm)(B) 1000 x 2200(C) 1500 x 1250(D) 4300 x 2800(E) 4000 x 4000report A 3151-1Eanalysesoverhead door0 1 2 3 4 5mscalefigure 1