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Comparisons between models and measurements of the input impedance of brass instruments bells

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text
 

Genre(s)

article
 

Forme(s)

document numérique
 

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Titre

Comparisons between models and measurements of the input impedance of brass instruments bells
 

Nom(s)

Eveno, Pauline (auteur)
 
Dalmont, Jean-Pierre (auteur)
 
Causse, René (auteur)
 
Gilbert, Joël (auteur)
 

Publication

Aalborg, Danemark , 2011
 

Description

Sujet(s)

Brass instruments   input impedance   horns   wave propagation   radiation impedance   BEM   multimodal method   transmission-matrix method
 

Résumé

This work is part of a project aiming at helping craftsmen to design and characterize their musical instruments. Starting from a given wind instrument shape, our objective consists in choosing the most relevant physical model able to predict the acoustical input impedance of this musical instrument once constructed. The modeling of bells in brass instruments is still problematic as the limits of plane wave approximation are known but no method is proven to give accurate results. The aim of the present paper is to compare the results given by different methods with measurements. Four different bells with known geometries are used in this study. These bells input impedances are calculated with a Boundary Element Method and with Transmission-Matrix Methods loaded with various radiation impedance models and based on axial or curvilinear abscissa. Surprisingly, a simple 1D wave propagation approximation based on curvilinear abscissa coupled with the radiation impedance of a pulsating portion of sphere gives results very close to the measurement.
 

Note(s)

Contribution au colloque ou congrès : Forum Acusticum
 

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Date de la notice

2012-02-03 01:00:00
 

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