ASTM E1123-86(2016)

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Designation: E1123 − 86 (Reapproved 2009) E1123 − 86 (Reapproved 2016)
Standard Practices for
Mounting Test Specimens for Sound Transmission Loss
Testing of Naval and Marine Ship Bulkhead Treatment
Materials
This standard is issued under the fixed designation E1123; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 These practices describe test specimen mountings to be used for naval and marine ship applications during sound
transmission loss tests performed in accordance with Test Method E90.
1.2 The structure specified in these practices is intended for mounting of single-layer treatments or composite treatments
consisting of various materials and configurations. Acoustical treatment materials may be combinations of acoustical absorbent
materials, limp mass septums, and insulation materials.
1.3 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
C634 Terminology Relating to Building and Environmental Acoustics
E90 Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements
3. Significance and Use
3.1 The sound transmission loss provided by a material that covers a flat surface depends not only on the physical properties
of the material but also on the type of structure to which it is mounted and the mounting method used.
3.2 Naval and marine architects and design engineers require specific transmission loss characteristics of acoustical treatment
materials as they would exhibit installed on a ship’s structure. The mounting structure and procedures specified in these practices
are intended to simulate such a shipboard environment.
3.3 Test reports may refer to this mounting by Practices E1123 instead of providing a detailed description of the mounting used.
4. Mounting Structure and Methods
4.1 The mounting structure consists of a fabricated aluminum bulkhead. This bulkhead is designed to fit within a 2.44-m (8-ft)
opening in the filler walls between the reverberation rooms of a test facility. Test result measurements due to the effects of the filler
walls may be accounted for as specified in Test Method E90. A larger mounting structure may be used if it can be demonstrated
that this structure yields results comparable 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 by 2.44 m (4 by 8 ft) and is fastened together by a 10.2 by 10.2 by 10.2-cm
(4 by 4 by 4-in.) aluminum I-beam.
4.1.2 The coupling is accomplished by using 8-mm ( ⁄16-in.) SAE grade B steel stove bolts, torqued to 3.33 m/kg (25 ft/lb).
4.1.3 The 6.4-mm ( ⁄4-in.) sheet aluminum panels, 1.22 by 2.44 m (4 by 8 ft), are supported with 10.2 by 10.2 cm (4 by 4 in.),
2.976-kg per linear metre (2-lb per linear ft) tee beams.
These practices are under the jurisdiction of ASTM Committee E33 on Building and Environmental Acoustics and are the direct responsibility of Subcommittee E33.03
on Sound Transmission.
Current edition approved April 1, 2009April 1, 2016. Published August 2009April 2016. Originally approved in 1986. Last previous edition approved in 19982009 as
E1123 – 86 (2003).(2009). DOI: 10.1520/E1123-86R16.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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E1123 − 86 (2016)
NOTE 1—6.4-mm sheet plate.
NOTE 2—10.2 by 10.2-cm tees, 2.976 kg per linear metre.
NOTE 3—Two 1.22 by 2.44-m bulkhead sections joined with I-beam using 8-mm bolts.
NOTE 4—Bulkhead sections delivered unassembled.
FIG. 1 Aluminum Bulkhead Details
4.1.3.1 The tee beams are welded to the 6.4-mm ( ⁄4-in.) aluminum sheets with welds on either side of the center member 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 severe warpage
of the bulkhead. The tee beams are positioned on the aluminum sheets to obtain a distance of 61 cm (2 ft) between tee beam centers
with the I-beam serving as the bulkhead center support.
4.1.4 Fig. 1 illustrates the construction details. The bulkhead shall be installed with the smooth side facing the acoustical source
room and fastened in the filler wall opening by any means which will provide a secure, rigid structure. Tapered wooden wedges
driven between the filler wall at each tee beam support will provide the necessary rigidity. Acoustical sealant shall be applied
around the bulkhead edges, between the filler wall
...