AIJ Journal of Technology and Design
Online ISSN : 1881-8188
Print ISSN : 1341-9463
ISSN-L : 1341-9463
Environmental Engineering
STUDY ON MEASURING METHOD BY PULSE SOUND SOURCE FOR END REFLECTION LOSS OF DUCT
Maya SATOU, Hiroyoshi SHIOKAWA
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Keywords: Pulse sound source, End reflection loss, Spectrum analysis
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2011 Volume 17 Issue 36 Pages 555-558

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Abstract
In general, end reflection loss value of duct for ASHRAE is used as the acoustic design data of the air-conditioning system.
However, the theoretical calculation is not described in ASHRAE Handbook and also an experimental examination is not done.
In this paper, the measuring method by pulse sound source for end reflection loss of duct is described and the end reflection loss values of the duct that of diameter is 200 mm are measured and calculated. These are compared with the values of ASHRAE and the differences of two on the frequencies from 50 Hz to 1500 Hz are small.
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© 2011 Architectural Institute of Japan
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