1、Designation: E 1414 06Standard Test Method forAirborne Sound Attenuation Between Rooms Sharing aCommon Ceiling Plenum1This standard is issued under the fixed designation E 1414; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.INTRODUCTIONThis test method is designed to measure the sound attenuation provided by a suspended ceiling inthe presence o
3、f a continuous plenum space under prescribed laboratory test conditions. The testmethod is an adaptation of AMA-1-II-1967 Method of Test. This modified test method may giveresults differing from the AMA-1-II procedure.1. Scope1.1 This test method utilizes a laboratory space so arrangedthat it simula
4、tes a pair of horizontally adjacent small offices orrooms separated by a partition and sharing a common plenumspace. The partition either extends to the underside of acommon plenum space or penetrates through it. In the pre-scribed configuration, special design features of the facilityensure that th
5、e only significant sound transmission path is byway of the ceiling and the plenum space1.2 Within the limitations outlined in the significance state-ment, the primary quantity measured by this test method is theceiling attenuation of a suspended ceiling installed in alaboratory environment. By accou
6、nting for receiving roomsound absorption, the normalized ceiling attenuation may bedetermined.1.3 The test method may also be used to evaluate theattenuation of composite ceiling systems comprised of theceiling material and other components such as luminaires andventilating systems.1.4 The field per
7、formance of a ceiling system may differsignificantly from the results obtained by this test method (seeSection 5, Significance and Use, and Test Method E 336).1.5 The procedures may also be used to study the additionalsound insulation that may be achieved by other attenuationmeasures. This would inc
8、lude materials used either as plenumbarriers or as backing for all or part of the ceiling.1.6 The facility may also be used to study the performanceof an integrated system comprising plenum, ceiling, andpartition, tested as a single assembly.1.7 This standard does not purport to address all of thesa
9、fety 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 ASTM Standards:2C 423 Test Method for Sound Ab
10、sorption and Sound Ab-sorption Coefficients by the Reverberation Room MethodC 634 Terminology Relating to Building and Environmen-tal AcousticsC 636 Practice for Installation of Metal Ceiling SuspensionSystems for Acoustical Tile and Lay-In PanelsE90 Test Method for Laboratory Measurement of Airborn
11、eSound 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 InsulationE 548 Guide for General Criteria Used for EvaluatingLaboratory Competence32.2 ANSI Standards:1This tes
12、t method 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 Sept. 1, 2006. Published September 2006. Originallyapproved in 1991. Last previous edition approved in
13、2000 as E 1414 00a.2For 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 Document Summary page onthe ASTM website.3Withdrawn.1Copyright ASTM International,
14、100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.S1.11-1986 Specification for Octave-Band and Fractional-Octave Band Analog and Digital Filters42.3 Other Standards:AMA 1-II-1967 Method of Test, Standard Specification forCeiling Sound Transmission Test by Two Room M
15、ethod53. Terminology3.1 DefinitionsFor definitions of terms used in this testmethod see Terminology C 634.3.2 Definitions of Terms Specific to This Standard:3.2.1 ceiling attenuation (Dc)the noise reduction betweenthe source and receiving rooms where flanking transmission byall paths are at least 10
16、 decibels lower than the path through theceiling and plenum.Dc5 L12 L2(1)where L1is the average one-third octave band soundpressure level in the source room; L2is the average one-thirdoctave band sound pressure level in the receiving room.3.2.2 normalized ceiling attenuation (Dn,c)the ceiling at-ten
17、uation adjusted to account for receiving room absorption.Dn,c5 Dc1 Nf(2)where Nfis the normalization term defined in 3.2.3.3.2.3 normalization term (Nf)the adjustment term deter-mined in 9.3 which normalizes the ceiling attenuation toaccount for receiving room absorption.3.2.4 ceiling attenuation cl
18、ass (CAC)a single figure ratingderived from the normalized ceiling attenuation values inaccordance with Classification E 413, except that the resultantrating shall be designated ceiling attenuation class.3.2.5 plenum spacethe whole of the void above thesuspended ceilings in both rooms. Its dimension
19、s are to bemeasured, discounting the thickness of any sound absorbingmaterial either adhered to walls or laid on the back of the testceiling.3.2.6 direct sound fieldthe sound that results from anacoustical source without reflection from boundaries.3.2.7 reverberant sound fieldthe sound in an enclose
20、d orpartially enclosed space that has been reflected repeatedly fromthe enclosure boundaries.4. Summary of Test Method4.1 The laboratory test facility consists of an outer shelldivided into two rooms by a partition and a suspended ceiling(the test specimen). The partition between the two rooms mayex
21、tend up to, or through, the suspended ceiling, dependingupon whether the specific test specimen is designed to becontinuous or interrupted at the partition line. The rooms arebuilt so that the only significant sound transmission pathbetween them is that provided by the test specimen and theceiling p
22、lenum. All other sound transmission paths must benegligible. The ceiling attenuation is determined in each of thetest frequency bands, by placing a sound source in one roomand then calculating the difference of the average soundpressure levels in both rooms. For the purposes of this testmethod, the
23、room containing the sound source is designated thesource room and the other, the receiving room.4.2 The measurement of a normalized ceiling attenuationrequires that the value of a normalization term dependent uponthe amount of sound absorption present in the receiving roombe known. Two alternate met
24、hods are used for the determina-tion of this normalization term.5. Significance and Use5.1 Modern offices and other multipurpose buildings com-monly have suspended acoustical ceilings installed over roomdividing partitions. The test facility prescribed in this testmethod is useful for providing ceil
25、ing attenuation data on therelevant ceiling/partition elements and systems, to ensure thatthe transmission of sound through the ceiling and plenumspace, or through the combination of ceiling, plenum space,and partition systems, provides a suitable degree of acousticalisolation.5.2 This test method i
26、s useful for rating and specifying,under standardized conditions, the sound attenuation perfor-mance of ceiling materials when mounted in a specifiedsuspension system.5.3 This test method may be useful for selecting a wall-ceiling system for probable compliance with a performancespecification for ov
27、erall sound isolation between rooms. How-ever, the actual field performance may differ significantly,particularly if the field plenum depth is not within the limitsspecified in this test method or if the plenum space containslarge ducts, beams, etc., or both. (See Test Method E 336.)5.4 The flexibil
28、ity inherent in the test facility enablesevaluation of the effects of penetrations, induced leakage paths,luminaire, and air diffuser installations and discontinuities inthe ceiling suspension system at the partition line, includingpenetration of the partition into the ceiling plenum. The effectof i
29、nstalling plenum barriers at the partition line may also beinvestigated.5.5 With the concentration of sound absorbent area offeredby a suspended sound absorbent ceiling installed in a room, itis not possible to obtain a good approximation to a diffusesound field in that room. The plenum dimensions p
30、revent themaintenance of a diffuse sound field above the test specimen.These factors affect the values of the measured ceiling soundattenuation and thus the measurements are not a fundamentalproperty of the ceiling. The test method measures the acousti-cal properties attainable under the prescribed
31、test conditions,which have been arbitrarily selected. The conditions must beadhered to in every test facility so that the measured results willbe consistent.Two methods for obtaining A, the receiving roomabsorption, are given without preference. One method, knownas the steady state method, has been
32、used to obtain an estimatefor A in the AMA 1-II-1967 standard. The other methodfollows the procedures used in Test Methods E 90 and C 423;justification for the use of this method may be found in4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036
33、, http:/www.ansi.org.5Method of theAmerican Board ProductsAssoc., (formerlyAcoustical MaterialsAssoc.) available from Ceiling and Interior Systems Contracting Assoc., 1800Pickwick Ave., Glenview, IL 60025.E1414062reference (1)6. Persons wishing to further investigate thelimitations imposed by this t
34、est method are advised to readreferences (2), (3), (4) and (5).5.6 Notwithstanding the above limitations, this type of testmethod has been used successfully for a number of years torank order commercial ceiling systems and the test results arecommonly used for this purpose.6. Test Signal6.1 Signal S
35、pectrum The sound signal used for this testshall constitute a band or bands of random noise with acontinuous distribution of frequencies over each test band.6.2 BandwidthThe measurement bandwidth shall be one-third octave. Specifically the overall frequency response of thefilter or filters, in the s
36、ource and microphone amplifiers, shallconform to ANSI Specification S 1.11-1986 for Order 3, Type1,13 octave band filters.6.3 Standard Test FrequenciesThe minimum frequencyrange shall be a series of contiguous one-third octave bandswith geometric center frequencies from 125 to 4000 Hz.7. Test Arrang
37、ement7.1 The essential features of the test facility are given below.7.1.1 Room ConstructionThe rooms shall be rectangularin shape and cross-section. The walls, floor, doors, and roofshould provide sufficient acoustical isolation to reduce externalnoise levels to at least 10 dB below the lowest test
38、 signal level.The sound absorption in each of the rooms should be made aslow as possible in order to achieve the best possible diffusefield condition. The average sound absorption coefficients ofthe floor and all vertical surfaces below the test ceiling shouldnot exceed 0.1 at any of the octave band
39、 center frequenciesgiven in 7.1.5.1. It is recommended that a structural disconti-nuity be provided close to the mid-point between the rooms tominimize flanking sound transmission, allowing high values ofceiling attenuation to be measured. The total length of eachside wall, including the vibration b
40、reak (if any), shall be 7.5 61.5 m (25 6 5 ft) and the width of the room shall be 4.65 60.23 m (15.25 6 0.75 ft). The overall height shall be 3.65 60.15 m (12 6 0.5 ft). All dimensions shall be measuredinternally. Fig. 1 shows the major dimensions of the test rooms.7.1.2 Separating Wall The separati
41、ng wall shall be ofsuch design that the sound power transmitted through it is atleast 10 dB less than the total sound power transmitted throughthe ceiling specimen. This requirement may be checked bymeasuring the Dcwith the calibration ceiling referenced inA1.2, in an interrupted configuration, and
42、an effective gypsumboard plenum closure above the partition. All of the separatingwall exterior surfaces shall be acoustically reflective. The wallshall be tapered at its upper extremity so that its overallthickness at the top, with the cap installed, is 76 6 2.5 mm (36 0.1 in.). The taper angle sha
43、ll be not less than 45 from theceiling plane. The height of the wall shall be such that the topexactly meets the lower surface of the ceiling specimen. In thecase of interrupted ceiling systems a 50 6 2.5 mm by 75 6 2.5mm (2 6 0.1 in. by 3 6 0.1 in.) wooden adaptor cap shall beinstalled. The length
44、of the adaptor cap shall be identical to thewidth of the wall. The capping should be designed to simulatea practical header condition typical of the type used for theceiling being tested. The wall shall be installed near themid-point of the test room so that two rooms are formed. Thetwo rooms shall
45、not differ in length by more than 15 %.NOTE 1One wall design which has been found to be effective isshown in Fig. 2.7.1.3 Plenum Depth The plenum depth shall be 760 6 25mm (30 6 1 in.) at the separating wall. At other places withinthe room, the plenum depth tolerance may be relaxed to 664mm (62.5 in
46、.).7.1.4 Plenum Width The plenum width shall be 4.3 60.02 m (14.1 6 0.1 ft) at the separating wall (Fig. 3). At otherpoints in the room, the plenum width should be the same as thefull room width (see 3.2.5). The restriction in plenum width atthe separating wall may be achieved by means of suitablepi
47、lasters installed either from floor to roof or from the level ofthe ceiling underside to the roof.7.1.5 Plenum Lining:7.1.5.1 All side walls of the plenum shall be lined withsuitable sound absorbing material not less than 76 mm (3 in.)thick. This material, shall when tested in accordance with TestMe
48、thod C 423 in a Type A mounting, have random incidencesound absorption coefficients not less than those shown below:6The boldface numbers in parentheses refer to the list of references at the end ofthis standard.FIG. 1 General Dimensions of the Test RoomNOTE 1Except for the adaptor cap, all English
49、units are standardlumber dimensions.FIG. 2 Vertical Section Through a Partition Found to Satisfy theRequirements of 7.2E1414063Octave Band CenterFrequency, Hz125 250 500 1000 2000 4000Absorption Coeffi-cient0.65 0.80 0.80 0.80 0.80 0.80NOTE 2A suitable plenum lining has been found to be a 6-in. thickglass fiber batt with a thin impervious membrane at a depth of 112 in.below the exposed face.7.1.5.2 Aledge or shelf, as wide as the plenum lining but notextending beyond the pilaster, may be constructed at ceilingheight around the perimeter of both test rooms to
