1、Designation: E 1123 86 (Reapproved 2003)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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 These practices describe test specimen mountings to be
3、used for naval and marine ship applications during soundtransmission loss tests performed in accordance with TestMethod E 90.1.2 The structure specified in these practices is intended formounting of single-layer treatments or composite treatmentsconsisting of various materials and configurations. Ac
4、ousticaltreatment 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
5、 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 ASTM Standards:C 634 Terminology Relatin
6、g to Environmental Acoustics2E 90 Test Method for Laboratory Measurement of AirborneSound Transmission Loss of Building Partitions and Ele-ments23. Significance and Use3.1 The sound transmission loss provided by a material thatcovers a flat surface depends not only on the physical proper-ties of the
7、 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 mounting s
8、tructure 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 structure consists
9、 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 E 90. A larger mou
10、nting 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 by 4-in.)
11、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-lb per lin
12、ear 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 severewarpage
13、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 facing the aco
14、usticalsource 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, between
15、the filler1These practices are under the jurisdiction of ASTM Committee E33 onEnvironmental Acoustics and are the direct responsibility of Subcommittee E33.03on Sound Transmission.Current edition approved Oct. 1, 2003. Published October 2003. Originallyapproved in 1986. Last previous edition approve
16、d in 1998 as E 1123 86 (1998).2Annual Book of ASTM Standards, Vol 04.06.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.wall and the bulkhead and the I-beam panel connector toensure an airtight seal. This seal should be confirmed bye
17、nergizing the acoustical source and listening for spuriousnoise transmission around 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
18、 installed on the smooth side of thebulkhead (source room side) and shall have 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
19、 when a 5-point anchor pattern is used on a 61 by91.4-cm (2 by 3-ft) panel.4.2.3 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 se
20、cured on thestud pins using self-locking galvanized steel washers, 3.8 cm(112 in.) 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 s
21、elf-locking wash-ers.4.4 Acoustical treatment materials shall be installed on thealuminum 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
22、 be followed:4.5.1 A 5.1-cm (2-in.) overlap (minimum) shall be providedon all limp 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 unass
23、embled.FIG. 1 Aluminum Bulkhead DetailsE 1123 86 (2003)24.5.2 Duct tape or an adhesive 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
24、, a 10.2-cm (4-in.)strip of sheet lead material shall be taped over the butt jointseams.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
25、over-compressing the backingmaterial.4.5.5 A third layer (if installed) shall be 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
26、precautions not to over-compress the thirdlayer material. Figure 3 (a), (b), and (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 lo
27、ss test,FIG. 2 Typical Stud Pin Pattern for a 2.44 by 2.44-m Structure (30.5-cm 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 (200
28、3)3the test report shall be stated as follows: The specimenmounting and methods utilized are in accordance with Prac-tices E 1123.5.1.1 Additional information required by Section 11 of TestMethod E 90 shall be included. The test report shall containtransmission loss values of the bulkhead structure
29、without anytreatment materials installed and the transmission loss valueswith treatment 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) Aco
30、ustic Material Installation Details (continued)Third Layer (Facing Board) Installation, Absorption Layer Installed over Limp Mass Septum and Fibrous Glass InsulationFIG. 3 (c) Acoustic Material Installation Details (continued)E 1123 86 (2003)4ASTM International takes no position respecting the valid
31、ity of any patent rights asserted in connection with any item mentionedin 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 subje
32、ct to revision at any time by the responsible technical committee and 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 Headquart
33、ers. Your comments will receive careful consideration at a meeting of 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
34、 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 (2003)5
