ESDU 00012:2010

$62.40

The Acoustic Attenuation of Absorbent Linings in Cylindrical Flow Ducts

Published By	Publication Date	Number of Pages
ESDU	2010-06	NA

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Category: ESDU

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INTRODUCTION

This Item provides a computerized means of estimating the sound
power attenuation due to the introduction of acoustically absorbent
linings in circular ducts from a knowledge of the normalized
acoustic impedance of the linings at each frequency. The computed
result may also be interpreted as the liner insertion loss, defined
as the reduction in sound power following the introduction of the
duct liner. The prediction method used is based on a theoretical
model which allows a selection of typical velocity profiles across
the duct. The program has the capability to consider up to ten
different liner sections in series in a circular duct of constant
cross-sectional area.

The Item addresses the total power reduction within the duct and
does not consider subsequent radiation to the far-field.