1、Designation: E 989 06Standard Classification forDetermination of Impact Insulation Class (IIC)1This standard is issued under the fixed designation E 989; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This classification provides a method for determining arating that can be used to compare the levels of impact noisegenerated by a sta
3、ndard tapping machine and transmittedthrough different floor-ceiling assemblies.1.2 The name given to the rating is assigned by the testmethod that invokes this classification.1.3 This classification is applicable only to one third octaveband impact noise data obtained using the standard tappingmach
4、ine described in Test Methods E 492 and E 1007.1.4 Test methods that invoke this classification include:1.4.1 Test Method E 492 the single-number rating iscalled impact insulation class (IIC).1.4.2 Test Method E 1007 the single-number rating iscalled field impact insulation class (FIIC).1.5 This sta
5、ndard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1
6、ASTM Standards:2C 634 Terminology Relating to Environmental AcousticsE 492 Test Method for Laboratory Measurement of ImpactSound Transmission Through Floor-Ceiling Assemblies Us-ing the Tapping MachineE 1007 Test Method for Field Measurement of TappingMachine Impact Sound Transmission Through Floor-
7、CeilingAssemblies and Associated Support Structures3. Terminology3.1 The following terms used in this classification aredefined in Terminology C 634.decibel soundimpact insulation classleveloctave bandsound insulationsound pressuresound pressure level4. Significance and Use4.1 The rating increases a
8、s the impact sound attenuation ofthe floor ceiling structure increases. The rating can be used byarchitects, builders, and specification and code authorities foracoustical design purposes in building constructions.4.2 The rating strictly only applies to excitation by thestandard tapping machine defi
9、ned in Test Methods E 492 andE 1007. It does not deal with low frequency sounds below 100Hz that are typically generated below lightweight joist floorswhen they are walked on. Nor does it deal with the squeaking,crunching or rattling sounds that can occur in joist constructionwhen elements in the co
10、nstruction are loose and occupantswalk on the floor.4.3 This classification shall only be used with one-thirdoctave band data.5. Basis of Classification5.1 Table 1 lists the sound pressure levels defining the shapeof the reference contour, C(f), for the sixteen one-third octavebands from 100 to 3150
11、 Hz.5.2 To determine the impact insulation rating of a floorceiling assembly, the impact sound pressure levels, L(f), mustfirst be rounded to the nearest decibel (dB).5.3 The reference contour, C(f), is then fitted to the impactsound pressure levels for the specimen by adding a constant Tto all valu
12、es of C(f) until the sum of positive differencesbetween the data and the fitted contour for all frequencies isless than or equal to 32 dB. Stating this criterion as a formula,gives:1This classification is under the jurisdiction of ASTM Committee E33 onEnvironmentalAcoustics and is the direct respons
13、ibility of Subcommittee E33.03 onSound Transmission.Current edition approved Jan. 1, 2006. Published January 2006. Originallyapproved in 1984. Last previous edition approved in 1999 as E 989 84(1999).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Servic
14、e at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.D5(f5100f53150ifposLnf!2$Cf! 1T%# (1)where the
15、 function ifpos returns the value of the expressioninside the square brackets if the value is positive. If the valueis zero or negative, ifpos returns zero. T is the greatest integerfor which D is less than or equal to 32.5.4 The second criterion that must be satisfied is that novalue of the differe
16、nces L(f) C(f) + T can be greater than8. T must be increased until the difference in each frequencyband is less than or equal to 8.5.5 When both criteria have been satisfied, the fitted contouris given by the array C(f) + T and the rating is given by 110 T.6. Presentation of Results6.1 It is recomme
17、nded that the test data be plotted in a graphtogether with the corresponding IIC contour obtained asdescribed in Section 5. In this way attention is drawn to thefrequency regions that limit the impact insulation performanceof the test specimen. Fig. X1.1 shows an example of spectrumhaving an IIC 49.
18、7. Keywords7.1 floors; IIC; impact noise; impact rating; tappingmachineAPPENDIX(Nonmandatory Information)X1. REFERENCE CONTOUR FITTED TO A MEASUREMENTFig. X1.1 shows an example of the reference contour fittedto a measurement.TABLE 1 Reference Impact Rating Contour ValuesFrequency, Hz Contour value,
19、dB Frequency, Hz Contour value,dB100 2 630 -1125 2 800 -2160 2 1000 -3200 2 1250 -6250 2 1600 -9315 2 2000 -12400 1 2500 -15500 0 3150 -18NOTENormalized impact sound pressure levels from a Test MethodE 492 measurement with an IIC rating of 49. The positive differences areshown as bars at the bottom
20、of the plot; their sum is 27. The solid line isfitted contour. The dotted line with symbols shows the measurements.FIG. X1.1 Reference Contour Fitted to a MeasurementE989062ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentione
21、din this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and
22、must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of
23、theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).E989063
