ASTM E2249-2002(2008) Standard Test Method for Laboratory Measurement of Airborne Transmission Loss of Building Partitions and Elements Using Sound Intensity《用声音强度试验室测量建筑物分割和元件的空气传.pdf

《ASTM E2249-2002(2008) Standard Test Method for Laboratory Measurement of Airborne Transmission Loss of Building Partitions and Elements Using Sound Intensity《用声音强度试验室测量建筑物分割和元件的空气传.pdf》由会员分享，可在线阅读，更多相关《ASTM E2249-2002(2008) Standard Test Method for Laboratory Measurement of Airborne Transmission Loss of Building Partitions and Elements Using Sound Intensity《用声音强度试验室测量建筑物分割和元件的空气传.pdf（15页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: E 2249 02 (Reapproved 2008)Standard Test Method forLaboratory Measurement of Airborne Transmission Loss ofBuilding Partitions and Elements Using Sound Intensity1This standard is issued under the fixed designation E 2249; the number immediately following the designation indicates the yea

2、r oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.INTRODUCTIONThis standard test method is part of a set for evaluati

3、ng the sound transmission loss of a partitionor partition element under laboratory conditions. It differs from Test Method E90in that the soundpower radiated by the element under test is measured directly using an intensity probe rather thanindirectly from the space averaged receiver room sound pres

4、sure and the room reverberation time.This test method is especially useful when the receiver room requirements of Test Method E90cannot be achieved, or flanking sound involving the receiver room surfaces is present but its influence isto be circumvented (1)2, as discussed in Annex A3.Others test met

5、hods to evaluate sound insulation of building elements include: Test Method E90,airborne transmission loss of an isolated partition element in a controlled laboratory environment, TestMethod E 492, laboratory measurement of impact sound transmission through floors, Test MethodE 336, measurement of s

6、ound isolation in buildings, Test Method E 1007, measurement of impactsound transmission in buildings, Guide E 966, measurement of sound transmission through buildingfacades and facade elements.1. Scope1.1 This test method covers the measurement of airbornesound transmission loss of building partiti

7、ons such as walls ofall kinds, operable partitions, floor-ceiling assemblies, doors,windows, roofs, panels and other space-dividing buildingelements. It may also be have applications in sectors other thanthe building industry, although these are beyond the scope.1.2 The primary quantity reported by

8、this standard is Inten-sity Transmission Loss (ITL) and shall not be given anothername. Similarly, the single-number rating Intensity SoundTransmission Class (ISTC) derived from the measured ITLshall not be given any other name.1.3 This test method may be used to reveal the soundradiation characteri

9、stics of a partition or portion thereof.1.4 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the

10、 user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE 1The method for measuring the sound intensity radiated by thebuilding element under test defined by this ASTM standard meets orexceeds those of IS

11、O 15186-1. Special consideration will have to be givento requirements for the source room and specimen mounting if compliancewith ISO 15186-1 is also desired as they differ from those of this standard.2. Referenced Documents2.1 ASTM Standards:3C 634 Terminology Relating to Building and Environmen-ta

12、l AcousticsE90 Test Method for Laboratory Measurement of AirborneSound Transmission Loss of Building Partitions and Ele-mentsE 336 Test Method for Measurement of Airborne SoundAttenuation between Rooms in BuildingsE 413 Classification for Rating Sound Insulation2.2 ANSI Standards:41This test method

13、is under the jurisdiction ofASTM Committee E33 on Buildingand Environmental Acoustics and is the direct responsibility of SubcommitteeE33.03 on Sound Transmission.Current edition approved Oct. 1, 2008. Published February 2009. Originallyapproved in 2002. Last previous edition approved in 2002 as E 2

14、24902.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards

15、Document Summary page onthe ASTM website.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.S1.9 Instruments

16、for the Measurement of Sound IntensityS1.11 Specification for Octave-Band and Fractional Octave-Band Analogue and Digital Filters2.3 ISO Standards:4ISO 140-3 AcousticsMeasurement of Sound Insulation inBuildings and of Building ElementsPart 3: LaboratoryMeasurements of Sound Insulation of Building El

17、ementsISO 9614-1 AcousticsDetermination of Sound PowerLevels of Noise Sources Using Sound IntensityPart 1:Measurement at Discrete PointsISO 9614-2 AcousticsDetermination of Sound PowerLevels of Noise Sources Using Sound IntensityPart 2:Measurement by ScanningISO 15186-1 AcousticsMeasurement of Sound

18、 Insulationin Buildings and of Building Elements Using SoundIntensityPart 1: Laboratory ConditionsISO 15186-2 AcousticsMeasurement of Sound Insulationin Buildings and of Building Elements Using SoundIntensityPart 2: In-Situ Conditions2.4 IEC Standard:5IEC 1043 Instruments for the Measurement of Soun

19、d Inten-sity3. Terminology3.1 The acoustical terminology used in this method isintended to be consistent with the definitions in TerminologyC 634 and Test Method E90. Unique definitions of relevanceto this test method are presented here:3.1.1 sound intensity, Itime averaged rate of flow ofsound ener

20、gy per unit area in the direction of the local particlevelocity. This is a vector quantity which is equal to:I51T*0Tpt! ut! dtWm2(1)where:p(t) = instantaneous sound pressure at a point, Pascals,u(t)= instantaneous particle velocity at the same point, m/s,andT = averaging time, s.3.1.2 normal sound i

21、ntensity, Incomponent of the soundintensity in the direction normal to a measurement surfacedefined by the unit normal vector n:In5 I nWm2(2)where:n= unit normal vector directed out of the volume enclosedby the measurement surface.3.1.3 normal unsigned sound intensity level, L|In|ten timesthe common

22、 logarithm of the ratio of the unsigned value of thenormal sound intensity to the reference intensity Ioas given by:L|In|5 10 log|In|IodB (3)where:Io5 10212Wm2(4)3.1.4 normal signed sound intensity level, LInten times thecommon logarithm of the ratio of the signed value of thenormal sound intensity

23、to the reference intensity Ioas given by:LIn5 sgnIn! 10 log|In|IodB (5)where:sgn(In) = takes the value of negative unity if the soundintensity is directed into the measurement vol-ume, otherwise it is unity.3.1.5 pressure-residual intensity index, dpIothe differencebetween the sound pressure level,

24、Lp, and the unsigned normalsound intensity level when the intensity probe is placed andoriented in a sound field where the sound intensity is zero,expressed in decibels,dpIo5 Lp2 L|In|(6)Additional details can be found in IEC 61043.3.1.6 measurement surfacesurface totally enclosing thebuilding eleme

25、nt under test on the receiving side, scanned orsampled by the probe during the measurements. This surfacehas an area Smexpressed in m2.3.1.7 measurement distance, dmdistance between themeasurement surface and the building element under test in adirection normal to the element.3.1.8 measurement subar

26、eapart of the measurement sur-face being measured with the intensity probe using onecontinuous scan or a series of discrete positions. The kthmeasurement subarea has an area Smkexpressed in m2.3.1.9 measurement volumethe volume that is bounded bythe measurement surface(s), the building element under

27、 test,and any connecting non-radiating surfaces.3.1.10 measurement arraya series of fixed intensity probepositions where each position represents a small subarea of thesub-divided area of a measurement surface.3.1.11 discrete point methoda method of integrating thesound intensity over the entire mea

28、surement surface where aseries of stationary microphone positions are chosen to ad-equately sample the test partition.3.1.12 scanning methoda method of integrating the soundintensity over the entire measurement surface whereby a seriesof subareas are scanned by moving the intensity probe in amethodi

29、cal fashion to adequately sample the test partition.3.1.13 field indicatorsa series of indicators used to assessthe quality of the measurement conditions, and ultimately theaccuracy, of the intensity measurement.3.1.13.1 dynamic capability index, Lda measure of theusable dynamic range of an intensit

30、y measuring system (whichis a function of the phase mismatch of the system and the biaserror factor, K), expressed in decibels.3.1.13.2 surface pressure-intensity indicatorthe differ-ence between the sound pressure level, and the normal soundintensity level on the measurement surface, both being tim

31、eand surface averaged. F2is used for the discrete point methodand FpIand for the scanning method.5Available from International Electrotechnical Commission (IEC), 3 rue deVaremb, Case postale 131, CH-1211, Geneva 20, Switzerland, http:/www.iec.ch.E 2249 02 (2008)23.1.13.3 negative partial power indic

32、ator, F3the differ-ence between the average sound pressure level integrated overa measurement surface and signed (accounting for direction)average normal intensity level.3.1.13.4 field non-uniformity indicator, F4this measure isonly applicable to the discrete point method and assess thesuitability o

33、f the selected measurement array.NOTE 2The field indicators and criteria used by this standard arebased on those of ISO 9614 and are a more stringent superset of thoserequired by ISO 15186-1. Functional definitions are given in Annex A1and Annex A2.3.1.14 flanking transmissiontransmission of sound f

34、rom asource to a receiving location other than directly through theelement under consideration.3.1.15 sound transmission loss, TLIn a specified fre-quency band, ten times the common logarithm of the ratio ofthe incident sound power, Wi, to the sound power transmittedthough the specimen under test, W

35、t, expressed in decibels.TL 5 10 log10FWiWtG(7)NOTE 3For this standard, TL is operationally defined by Eq 13 anddiffers from the definitions given in Test Method E90only in the way thatthe transmitted sound power is estimated.NOTE 4Transmission loss is a property of the specimen and to a firstapprox

36、imation, is independent of the specimen area and dimension.Nevertheless, results of specimens that have significantly different dimen-sions and aspect ratios can vary significantly, especially at low frequen-cies, as this will hinder comparison. It is for this reason that this standardrequires a min

37、imum area for the test specimen.4. Summary of Test Method4.1 The building element under test is installed between twospaces creating two spaces as conceptually shown in Fig. 1.The source space is a well-defined room satisfying the criteriaof Test Method E90while the other, the receiver room, has nos

38、pecific physical requirements for size or absorption condition.It is assumed that the sound field in the source room isapproximately diffuse since the incident sound power isestimated from the space averaged sound pressure level. Thesound power transmitted into the receiver space is estimatedfrom di

39、rect measurement of the radiated sound intensity over ameasurement surface that completely encloses the portion ofthe building element in the receiver room. The transmissionloss of the building element is then estimated using the incidentand transmitted sound powers. Because transmission loss is afu

40、nction of frequency, measurements are made in a series offrequency bands.5. Significance and Use5.1 This test method can be used to obtain an estimate thetransmission loss of building elements in a laboratory settingwhere the source room and the specimen mounting conditionssatisfy the requirements o

41、f Test Method E90. The acceptabilityof the receiving room will be determined by a set of fieldindicators that define the quality and accuracy of the intensityestimate.5.2 By appropriately constructing the surface over whichthe intensity is measured it is possible to selectively excludethe influence

42、of sound energy paths including the effects fromjoints, gaps as well as flanking sound paths. This method maybe particularly useful when accurate measurements of a parti-tion can not be made in an Test Method E90facility becausethe partition sound insulation is limited by flanking transmis-sion invo

43、lving facility source and receiver room surfaces, (forexample, the path from the source room floor to the receiverroom floor via the isolators and the slab supporting the two).Annex A3 discusses this in detail.5.3 The discrete point method allows the mapping of theradiated sound intensity which can

44、be used to identify defectsor unique features (2) of the partition.5.4 Current research reported in the literature indicate thatthere exists a bias between measures of transmission lossobtained using the intensity technique and those obtained usingthe conventional two room reverberation technique (f

45、or ex-ample, Test Method E90, (3) and (4). Appendix E providesestimates of the bias that might be expected. Despite thepresence of a bias, no corrections are to be applied to themeasured data obtained by this test method.6. Test Rooms6.1 Source RoomThe source room shall possess the fol-lowing proper

46、ties:6.1.1 It shall comply with the relevant sections of TestMethod E90. In particular, it shall possess the appropriateroom size, shape, volume, diffusion, absorption characteristics.6.1.2 Flanking paths involving source room surfaces and thespecimen shall be insignificant relative to direct transm

47、issionthrough the specimen under test. The procedure and criterionof Annex A3 shall be followed and satisfied.6.2 Receiving Room or SpaceThe receiving room may beany space meeting the requirements for background noise andthe field indicators and associated field criteria (Annex A1 forthe discrete po

48、int method, and Annex A2 for the scanningmethod).FIG. 1 Conceptualized Testing Arrangement Showing the Sourceand Receiving RoomsE 2249 02 (2008)37. Test Partitions7.1 Size, Mounting and AgeingSpecimens shall be in-stalled in full compliance with all relevant requirements of TestMethod E90.8. Test Si

49、gnal Sound Sources8.1 Signal SpectrumThe sound signals used for these testsshall be in full compliance with the requirements of TestMethod E90.8.2 Sound SourcesThe number, characteristics, orienta-tion and location of loudspeakers shall be in full compliancewith the requirements of Test Method E90.8.3 Standard Test FrequenciesAs a minimum, measure-ments should be made at all of the one-third-octave bandsstated in Test Method E90.9. Measurement Surface9.1 The measurement surface shall define a measurementvolume that (1) compl