01/562316 DC : DRAFT JULY 2001
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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BS EN ISO 7235 ACOUSTICS - LABORATORY MEASUREMENT PROCEDURES FOR DUCTED SILENCERS AND AIR-TERMINAL UNITS - INSERTION LOSS, FLOW NOISE AND TOTAL PRESSURE LOSS
08-09-2003
23-11-2012
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols (and abbreviated terms)
5 Test facilities and instrumentation
5.1 Purpose and types of test facilities
5.2 Acoustic testing of silencers
5.3 Acoustic testing of air-terminal units
5.4 Flow testing
5.5 Dynamic testing
6 Test procedures
6.1 General
6.2 Insertion loss
6.3 Transmission loss
6.4 Sound power level of the flow noise (or regenerated sound)
6.5 Volume flow rate and pressure loss coefficient
7 Information to be recorded
7.1 Description of the test object
7.2 Instrumentation
7.3 Sound source equipment
7.4 Test, substitution and transmission ducts
7.5 Transitions
7.6 Anechoic termination
7.7 Reverberation room
7.8 Acoustical test results
7.9 Measurement uncertainty
8 Information to be reported
Annex A (normative) Design of the sound field excitation
equipment and qualification tests
A.1 General
A.2 Modal filter for measurement without flow
A.3 Sound field excitation equipment for measurement
with flow
A.4 Qualification tests
Annex B (normative) Transmission element
B.1 Design of a transmission element
B.2 Measurement of the reflection coefficient of a
transmission element
B.3 Calculation of the transmission loss and reflection
coefficient at the open end of a duct
Annex C (normative) Duct walls and limiting insertion loss
C.1 Flanking transmission
C.2 Arrangements for determining the limiting insertion
loss
Annex D (normative) Conversion of one-third-octave-band
attenuation values to octave-band attenuation values
Annex E (normative) Measurement on large parallel-baffle
silencers
Annex F (normative) Test of longitudinal attenuation
Annex G (informative) Anechoic terminations
G.1 Guidelines for the design and construction of an
anechoic termination
G.2 Evaluation of performance
Annex H (informative) Examples of measurement arrangements
Bibliography
BS EN ISO 7235
| Committee |
EH/1/4
|
| DocumentType |
Draft
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
| IEC 60942:2003 | Electroacoustics - Sound calibrators |
| ISO 11820:1996 | Acoustics — Measurements on silencers in situ |
| ISO 3746:2010 | Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Survey method using an enveloping measurement surface over a reflecting plane |
| ISO 5135:1997 | Acoustics Determination of sound power levels of noise from air-terminal devices, air-terminal units, dampers and valves by measurement in a reverberation room |
| ISO 5167-1:2003 | Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements |
| ISO 9614-3:2002 | Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 3: Precision method for measurement by scanning |
| ISO 14163:1998 | Acoustics — Guidelines for noise control by silencers |
| ISO 5221:1984 | Air distribution and air diffusion Rules to methods of measuring air flow rate in an air handling duct |
| IEC 61260:1995 | Electroacoustics - Octave-band and fractional-octave-band filters |
| ISO 3714:1980 | Oil of pennyroyal |
| ISO 5136:2003 | Acoustics — Determination of sound power radiated into a duct by fans and other air-moving devices — In-duct method |
| IEC 60651:1979+AMD1:1993+AMD2:2000 CSV | Sound level meters |
| IEC 60804:2000 | Integrating-averaging sound level meters |
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