ASTM E1123-86(1998)
(Practice)Standard Practices for Mounting Test Specimens for Sound Transmission Loss Testing of Naval and Marine Ship Bulkhead Treatment Materials
Standard Practices for Mounting Test Specimens for Sound Transmission Loss Testing of Naval and Marine Ship Bulkhead Treatment Materials
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.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: E 1123 – 86 (Reapproved 1998)
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 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 3.3 Test reports may refer to this mounting by Practices
E 1123 instead of providing a detailed description of the
1.1 These practices describe test specimen mountings to be
mounting used.
used for naval and marine ship applications during sound
transmission loss tests performed in accordance with Test
4. Mounting Structure and Methods
Method E 90.
4.1 The mounting structure consists of a fabricated alumi-
1.2 The structure specified in these practices is intended for
num bulkhead. This bulkhead is designed to fit within a 2.44-m
mounting of single-layer treatments or composite treatments
(8-ft) opening in the filler walls between the reverberation
consisting of various materials and configurations. Acoustical
rooms of a test facility. Test result measurements due to the
treatment materials may be combinations of acoustical absor-
effects of the filler walls may be accounted for as specified in
bent materials, limp mass septums, and insulation materials.
Test Method E 90. A larger mounting structure may be used if
1.3 The values stated in SI units are to be regarded as the
it can be demonstrated that this structure yields results com-
standard. The values in parentheses are for information only.
parable to the 2.44 by 2.44-m (8 by 8-ft) mounting structure.
1.4 This standard does not purport to address all of the
4.1.1 The bulkhead is fabricated in two sections, 1.22 by
safety concerns, if any, associated with its use. It is the
2.44 m (4 by 8 ft) and is fastened together by a 10.2 by 10.2 by
responsibility of the user of this standard to establish appro-
10.2-cm (4 by 4 by 4-in.) aluminum I-beam.
priate safety and health practices and determine the applica-
4.1.2 The coupling is accomplished by using 8-mm ( ⁄16-in.)
bility of regulatory limitations prior to use.
SAE grade B steel stove bolts, torqued to 3.33 m/kg (25 ft/lb).
2. Referenced Documents 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
2.1 ASTM Standards:
4 in.), 2.976-kg per linear metre (2-lb per linear ft) tee beams.
C 634 Terminology Relating to Environmental Acoustics
4.1.3.1 The tee beams are welded to the 6.4-mm ( ⁄4-in.)
E 90 Test Method for Laboratory Measurement of Airborne
aluminum sheets with welds on either side of the center
Sound Transmission Loss of Building Partitions
member of the tee at 53.3-cm (21-in.) intervals.
3. Significance and Use 4.1.3.2 Weld areas should be approximately 7.6 cm (3 in.)
long. Welding in excess of these intervals may cause severe
3.1 The sound transmission loss provided by a material that
warpage of the bulkhead. The tee beams are positioned on the
covers a flat surface depends not only on the physical proper-
aluminum sheets to obtain a distance of 61 cm (2 ft) between
ties of the material but also on the type of structure to which it
tee beam centers with the I-beam serving as the bulkhead
is mounted and the mounting method used.
center support.
3.2 Naval and marine architects and design engineers re-
4.1.4 Fig. 1 illustrates the construction details. The bulkhead
quire specific transmission loss characteristics of acoustical
shall be installed with the smooth side facing the acoustical
treatment materials as they would exhibit installed on a ship’s
source room and fastened in the filler wall opening by any
structure. The mounting structure and procedures specified in
means which will provide a secure, rigid structure. Tapered
these practices are intended to simulate such a shipboard
wooden wedges driven between the filler wall at each tee beam
environment.
support will provide the necessary rigidity. Acoustical sealant
shall be applied around the bulkhead edges, between the filler
These practices are under the jurisdiction of ASTM Committee E-33 on
wall and the bulkhead and the I-beam panel connector to
Environmental Acoustics and are the direct responsibility of Subcommittee E33.03
ensure an airtight seal. This seal should be confirmed by
on Sound Transmission.
energizing the acoustical source and listening for spurious
Current edition approved Aug. 29, 1986. Published January 1987. Originally
published as E1123–86. Last previous edition E1123–86 (1994){1.
Annual Book of ASTM Standards, Vol 04.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
E 1123 – 86 (1998)
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
noise transmission around the sealed perimeter crevices with a where required to hold treatment materials securely against the
stethoscope on the receiver room side. bulkhead. Lightweight backing materials use
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.