Transcription of Suggested Modifications to ASTM Test Method E 477
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Suggested Modifications to ASTM Test Method E 477
SOUND & VIBRATION/JUNE 2011 ASTM E-477 is the current standard test Method used in North America for evaluating the acoustic and aerodynamic perfor-mance 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.
12 SOUND & VIBRATION/JUNE 2011 www.SandV.com ASTM E-477 is the current standard test method used in North America for evaluating the acoustic and aerodynamic perfor-mance of duct silencers.
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