Optimisation of anechoic duct termination using line theory

摘要

Anechoic terminations are often required for in-duct measurement. Various solutions have been proposed but rarely an optimisation process is proposed. In the present paper we show how to design and optimize an anechoic termination with perforated holes covered by a tissue of known acoustic resistance. From line theory some rules allowing the optimisation are derived. Experiments show that terminations performance can be predicted with a good accuracy leading to efficient solutions with slim dimensions. (C) 2016 Elsevier Ltd. All rights reserved.