ESDU 78003:2011

$62.40

Evaluation of the Attenuation of Broad-Band Sound by a Non-Uniform Still Atmosphere

Published By	Publication Date	Number of Pages
ESDU	2011-03	NA

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Category: ESDU

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ESDU 78003 gives a method of obtaining the attenuation across a
frequency band by integrating the discrete frequency attenuation
values given in ESDU 78002 over the frequency range. Allowance is
made for spectrum shape and guidance is given on an atmospheric
layering technique for use when atmospheric properties vary over
the propagation path. A computer program, ESDUpac A7803, is
provided. It calculates band attenuation using an ideal filter
shape, while a rapid graphical procedure for obtaining the
one-third octave band attenuation is also included. The program
gives band attenuation for up to 34, constant percentage or
constant bandwidth, frequency bands. A maximum of 20 layers may be
used to specify the variation of temperature and relative humidity
along the propagation path. Two worked examples illustrate the use
of the program and the format of the input and output. The program
can also be used to add or subtract band attenuation from spectra
input to the program using the Common Data File system.


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Published Code	ESDU
Published By	ESDU
Publication Date	2011-03
Pages Count	NA
Language	English
File Size	1.3 MB
ISBN	9780856792281

ESDU 78003:2011

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