Experimental Determination of the Equivalent Circuit of an Open Side Hole: Linear and Non Linear Behaviour

Author: Dalmont Jean-Pierre   Nederveen Cornelis J.   Dubos Véronique   Ollivier S´bastien   Méserette Vincent   te Sligte Edwin  

Publisher: S. Hirzel Verlag

ISSN: 0001-7884

Source: Acta Acustica, Vol.88, Iss.4, 2002-07, pp. : 567-575

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Abstract

The present paper presents an experimental characterisation of an open side hole i.e. a short open tube branched perpendicular to the main tube. In a first experiment, the series and parallel length corrections are determined at low amplitude for two diameters and compared with recent theoretical results [1, 2]. The real part of the shunt impedance is also determined and is shown to be satisfyingly described by a model including viscothermal losses in the hole and the radiation impedance. In a second experiment, the series and shunt impedances of the equivalent circuit are measured at a large amplitude. Results show that resistances proportional to the velocity in the side hole have to be added to both the series and shunt impedances.