1、Designation: E 1123 86 (Reapproved 2009)Standard Practices forMounting Test Specimens for Sound Transmission LossTesting of Naval and Marine Ship Bulkhead TreatmentMaterials1This standard is issued under the fixed designation E 1123; 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.1. Scope1.1 These practices describe test specimen mountings to beu
3、sed for naval and marine ship applications during soundtransmission loss tests performed in accordance with TestMethod E90.1.2 The structure specified in these practices is intended formounting of single-layer treatments or composite treatmentsconsisting of various materials and configurations. Acou
4、sticaltreatment materials may be combinations of acoustical absor-bent materials, limp mass septums, and insulation materials.1.3 The values stated in SI units are to be regarded as thestandard. The values in parentheses are for information only.1.4 This standard does not purport to address all of t
5、hesafety 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 634 Terminology Relating
6、 to Building and Environmen-tal AcousticsE90 Test Method for Laboratory Measurement of AirborneSound Transmission Loss of Building Partitions and Ele-ments3. Significance and Use3.1 The sound transmission loss provided by a material thatcovers a flat surface depends not only on the physical proper-t
7、ies of the material but also on the type of structure to which itis mounted and the mounting method used.3.2 Naval and marine architects and design engineers re-quire specific transmission loss characteristics of acousticaltreatment materials as they would exhibit installed on a shipsstructure. The
8、mounting structure and procedures specified inthese practices are intended to simulate such a shipboardenvironment.3.3 Test reports may refer to this mounting by PracticesE 1123 instead of providing a detailed description of themounting used.4. Mounting Structure and Methods4.1 The mounting structur
9、e consists of a fabricated alumi-num bulkhead. This bulkhead is designed to fit within a 2.44-m(8-ft) opening in the filler walls between the reverberationrooms of a test facility. Test result measurements due to theeffects of the filler walls may be accounted for as specified inTest Method E90. A l
10、arger mounting structure may be used ifit can be demonstrated that this structure yields results com-parable to the 2.44 by 2.44-m (8 by 8-ft) mounting structure.4.1.1 The bulkhead is fabricated in two sections, 1.22 by2.44 m (4 by 8 ft) and is fastened together by a 10.2 by 10.2 by10.2-cm (4 by 4 b
11、y 4-in.) aluminum I-beam.4.1.2 The coupling is accomplished by using 8-mm (516-in.)SAE grade B steel stove bolts, torqued to 3.33 m/kg (25 ft/lb).4.1.3 The 6.4-mm (14-in.) sheet aluminum panels, 1.22 by2.44 m (4 by 8 ft), are supported with 10.2 by 10.2 cm (4 by4 in.), 2.976-kg per linear metre (2-l
12、b per linear ft) tee beams.4.1.3.1 The tee beams are welded to the 6.4-mm (14-in.)aluminum sheets with welds on either side of the centermember of the tee at 53.3-cm (21-in.) intervals.4.1.3.2 Weld areas should be approximately 7.6 cm (3 in.)long. Welding in excess of these intervals may cause sever
13、ewarpage of the bulkhead. The tee beams are positioned on thealuminum sheets to obtain a distance of 61 cm (2 ft) betweentee beam centers with the I-beam serving as the bulkheadcenter support.4.1.4 Fig. 1 illustrates the construction details. The bulkheadshall be installed with the smooth side facin
14、g the acousticalsource room and fastened in the filler wall opening by anymeans which will provide a secure, rigid structure. Taperedwooden wedges driven between the filler wall at each tee beamsupport will provide the necessary rigidity. Acoustical sealantshall be applied around the bulkhead edges,
15、 between the fillerwall and the bulkhead and the I-beam panel connector to1These practices are under the jurisdiction of ASTM Committee E33 onBuilding and Environmental Acoustics and are the direct responsibility of Subcom-mittee E33.03 on Sound Transmission.Current edition approved April 1, 2009. P
16、ublished August 2009. Originallyapproved in 1986. Last previous edition approved in 1998 as E 1123 86 (2003).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 sta
17、ndards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ensure an airtight seal. This seal should be confirmed byenergizing the acoustical source and listening for spuriousnoise transmission ar
18、ound the sealed perimeter crevices with astethoscope on the receiver room side.4.2 Self-adhesive insulation anchors (stud pins) with 5.1 by5.1-cm (2 by 2-in.) galvanized steel plates and 12 gage spindles(minimum) shall be installed on the smooth side of thebulkhead (source room side) and shall have
19、the followingdimensions:4.2.1 Stud pins shall be placed on centers not exceeding30.5 cm (12 in.).4.2.2 Stud pins shall not be more than 15.2 cm (6 in.) fromthe edge of the treatment material except for center panelsupport when a 5-point anchor pattern is used on a 61 by91.4-cm (2 by 3-ft) panel.4.2.
20、3 Stud pin length shall be sufficient to accommodatemounting of the maximum thickness of the specimen materialsto be tested.4.2.4 A typical stud pin pattern is shown in Fig. 2.4.3 Acoustical treatment material shall be secured on thestud pins using self-locking galvanized steel washers, 3.8 cm(112 i
21、n.) in diameter. Self-locking washers shall be used onlywhere required to hold treatment materials securely against thebulkhead. Lightweight backing materials used in multiple-layer treatments generally will not require self-locking wash-ers.4.4 Acoustical treatment materials shall be installed on t
22、healuminum bulkhead as they would be applied on a ship. Buttjoints of the acoustical material panels shall be as tight and asevenly aligned as possible.4.5 When limp mass septums are applied, the followingprocedures shall be followed:4.5.1 A 5.1-cm (2-in.) overlap (minimum) shall be providedon all l
23、imp mass material seams.NOTE 16.4-mm sheet plate.NOTE 210.2 by 10.2-cm tees, 2.976 kg per linear metre.NOTE 3Two 1.22 by 2.44-m bulkhead sections joined with I-beam using 8-mm bolts.NOTE 4Bulkhead sections delivered unassembled.FIG. 1 Aluminum Bulkhead DetailsE 1123 86 (2009)24.5.2 Duct tape or an a
24、dhesive tape shall be used to tapeover seam areas ensuring the limp mass material is smooth andconforms to the surface of material mounted under the limpmass septum (if installed).4.5.3 For lead-faced fibrous glass panels, a 10.2-cm (4-in.)strip of sheet lead material shall be taped over the butt jo
25、intseams.4.5.4 Self-locking washers shall be applied to secure limpmass septums in place. The washers should be installed in sucha fashion that the limp mass septum is tight against the materialmounted underneath without over-compressing the backingmaterial.4.5.5 A third layer (if installed) shall b
26、e applied as stated in4.4 and duct tape or an adhesive tape shall be applied overseam areas. Self-locking washers or retainers shall be installedto ensure the third-layer material is secure against the limpmass observing precautions not to over-compress the thirdlayer material. Figure 3 (a), (b), an
27、d (c) illustrate a typicalinstallation of a three-layer acoustical transmission loss treat-ment.5. Test Report5.1 When the mounting structure and methods specified inthese practices are used during a sound transmission loss test,FIG. 2 Typical Stud Pin Pattern for a 2.44 by 2.44-m Structure (30.5-cm
28、 Between Stud Centers and 15.2-cm from Material Edges)Backing Board or Underlayment Installation, 5.1-cm (2 in.) Fibrous Glass Insolation Material IllustratedFIG. 3 (a) Acoustic Material Installation DetailsE 1123 86 (2009)3the test report shall be stated as follows: The specimenmounting and methods
29、 utilized are in accordance with Prac-tices E 1123.5.1.1 Additional information required by Section 11 of TestMethod E90shall be included. The test report shall containtransmission loss values of the bulkhead structure without anytreatment materials installed and the transmission loss valueswith tre
30、atment materials installed.6. Keywords6.1 bulkhead; marine acoustical applications; sound trans-mission lossLimp Mass Septum Installation (66-cm Width Material Shown, Installed over Fibrous Glass Material)FIG. 3 (b) Acoustic Material Installation Details (continued)Third Layer (Facing Board) Install
31、ation, Absorption Layer Installed over Limp Mass Septum and Fibrous Glass InsulationFIG. 3 (c) Acoustic Material Installation Details (continued)E 1123 86 (2009)4ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this st
32、andard. 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 must be rev
33、iewed 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 theresponsi
34、ble 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).E 1123 86 (2009)5
