Suggested Modifications to ASTM Test Method E 477

ASTM E-477 is the current standard test method used in North America for evaluating the acoustic and aerodynamic performance of duct silencers. The test method uses, at a minimum, a source chamber, a test duct (that includes a test specimen), and a reverberation chamber. If testing under flow is des...

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Bibliographic Details
Published inSound & vibration Vol. 45; no. 6; pp. 12 - 17
Main Author LILLY, Jerry G
Format Magazine Article Trade Publication Article
LanguageEnglish
Published Cleveland, OH Acoustical Publications 01.06.2011
Tech Science Press
Subjects
Acoustical measurements and instrumentation
Acoustics
Aeroacoustics, atmospheric sound
Air flow
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Noise
Noise: its effects and control
Physics
Studies
Test methods
Acoustic reverberation
Muffler
Large pipe
Aerodynamic noise
Aerodynamics
Test standard
Maintenance
Experimental study
Test bar
Noise control
Silencer
Air flow
Standard test
Pressure drop
Insertion loss
ASTM standard
Aeroacoustics
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Summary:ASTM E-477 is the current standard test method used in North America for evaluating the acoustic and aerodynamic performance of duct silencers. The test method uses, at a minimum, a source chamber, a test duct (that includes a test specimen), and a reverberation chamber. If testing under flow is desired, the system also requires a fan chamber that can provide quiet airflow through the test duct. The results of the test method yield silencer insertion loss, self-generated noise, both as a function of acoustic frequency and flow velocity, and pressure drop. There are several problems with the current test method, some that are being addressed by the ASTM working group that is responsible for the development and maintenance of this standard. This article highlights the most significant problems associated with the current standard and proposes modifications to the standard that should, if adopted, improve the intralaboratory reproducibility of the test results. [PUBLICATION ABSTRACT]
ISSN:1541-0161
2693-1443