Measurement of the Noise of Ducted Fans
作者:
C. G. Van Niekerk,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1956)
卷期:
Volume 28,
issue 4
页码: 681-687
ISSN:0001-4966
年代: 1956
DOI:10.1121/1.1908444
出版商: Acoustical Society of America
数据来源: AIP
摘要:
A proposed technique for measuring the noise of a ducted fan by means of a microphone placed inside the fan duct was evaluated by comparing results so obtained with those obtained by measuring the total sound energy radiated from the duct into a reverberation chamber. A suitable microphone windscreen was developed and was used to reduce the aerodynamic self‐noise generated by the microphone to a negligible minimum. Good correlation was obtained, and by studying transverse resonance conditions in a duct it was attempted to show how suitable microphone stations could be found to eliminate measuring errors caused by the existence of standing waves.
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