Standard Practices for Mounting Test Specimens for Sound Transmission Loss Testing of Naval and Marine Ship Bulkhead Treatment Materials

SIGNIFICANCE AND USE
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.
Naval and marine architects and design engineers require specific transmission loss characteristics of acoustical treatment materials as they would exhibit installed on a ship’structure. The mounting structure and procedures specified in these practices are intended to simulate such a shipboard environment.
Test reports may refer to this mounting by Practices E 1123 instead of providing a detailed description of the mounting used.
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 E 90.
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.

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Publication Date
30-Sep-2003
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ASTM E1123-86(2003) - Standard Practices for Mounting Test Specimens for Sound Transmission Loss Testing of Naval and Marine Ship Bulkhead Treatment Materials
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E1123–86 (Reapproved 2003)
Standard Practices for
Mounting Test Specimens for Sound Transmission Loss
Testing of Naval and Marine Ship Bulkhead Treatment
1
Materials
This standard is issued under the fixed designation E 1123; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope structure. The mounting structure and procedures specified in
these practices are intended to simulate such a shipboard
1.1 These practices describe test specimen mountings to be
environment.
used for naval and marine ship applications during sound
3.3 Test reports may refer to this mounting by Practices
transmission loss tests performed in accordance with Test
E 1123 instead of providing a detailed description of the
Method E 90.
mounting used.
1.2 The structure specified in these practices is intended for
mounting of single-layer treatments or composite treatments
4. Mounting Structure and Methods
consisting of various materials and configurations. Acoustical
4.1 The mounting structure consists of a fabricated alumi-
treatment materials may be combinations of acoustical absor-
num bulkhead.This bulkhead is designed to fit within a 2.44-m
bent materials, limp mass septums, and insulation materials.
(8-ft) opening in the filler walls between the reverberation
1.3 The values stated in SI units are to be regarded as the
rooms of a test facility. Test result measurements due to the
standard. The values in parentheses are for information only.
effects of the filler walls may be accounted for as specified in
1.4 This standard does not purport to address all of the
Test Method E 90. A larger mounting structure may be used if
safety concerns, if any, associated with its use. It is the
it can be demonstrated that this structure yields results com-
responsibility of the user of this standard to establish appro-
parable to the 2.44 by 2.44-m (8 by 8-ft) mounting structure.
priate safety and health practices and determine the applica-
4.1.1 The bulkhead is fabricated in two sections, 1.22 by
bility of regulatory limitations prior to use.
2.44 m (4 by 8 ft) and is fastened together by a 10.2 by 10.2 by
2. Referenced Documents 10.2-cm (4 by 4 by 4-in.) aluminum I-beam.
5
4.1.2 The coupling is accomplished by using 8-mm ( ⁄16-in.)
2.1 ASTM Standards:
2
SAE grade B steel stove bolts, torqued to 3.33 m/kg (25 ft/lb).
C 634 Terminology Relating to Environmental Acoustics
1
4.1.3 The 6.4-mm ( ⁄4-in.) sheet aluminum panels, 1.22 by
E 90 Test Method for Laboratory Measurement ofAirborne
2.44 m (4 by 8 ft), are supported with 10.2 by 10.2 cm (4 by
Sound Transmission Loss of Building Partitions and Ele-
2 4 in.), 2.976-kg per linear metre (2-lb per linear ft) tee beams.
ments
1
4.1.3.1 The tee beams are welded to the 6.4-mm ( ⁄4-in.)
3. Significance and Use aluminum sheets with welds on either side of the center
member of the tee at 53.3-cm (21-in.) intervals.
3.1 The sound transmission loss provided by a material that
4.1.3.2 Weld areas should be approximately 7.6 cm (3 in.)
covers a flat surface depends not only on the physical proper-
long. Welding in excess of these intervals may cause severe
ties of the material but also on the type of structure to which it
warpage of the bulkhead. The tee beams are positioned on the
is mounted and the mounting method used.
aluminum sheets to obtain a distance of 61 cm (2 ft) between
3.2 Naval and marine architects and design engineers re-
tee beam centers with the I-beam serving as the bulkhead
quire specific transmission loss characteristics of acoustical
center support.
treatment materials as they would exhibit installed on a ship’s
4.1.4 Fig.1illustratestheconstructiondetails.Thebulkhead
shall be installed with the smooth side facing the acoustical
1
source room and fastened in the filler wall opening by any
These practices are under the jurisdiction of ASTM Committee E33 on
Environmental Acoustics and are the direct responsibility of Subcommittee E33.03
means which will provide a secure, rigid structure. Tapered
on Sound Transmission.
wooden wedges driven between the filler wall at each tee beam
Current edition approved Oct. 1, 2003. Published October 2003. Originally
support will provide the necessary rigidity. Acoustical sealant
approved in 1986. Last previous edition approved in 1998 as E 1123 – 86 (1998).
2
Annual Book of ASTM Standards, Vol 04.06. shall be applied around the bulkhead edges, between the filler
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