Pressure fields in the vicinity of brass musical instrument bells measured using a two dimensional grid array and comparison with multimodal models
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Brass musical instruments act as a source of spherical waves for low frequencies while at higher frequencies the directivity produces a diffracting beam. The directivity and radius of the wavefronts (and therefore the source position) may be expected to depend on the frequency in addition to the geometry of the bell. In this work, experimental determination of the wavefronts propagating from the bell section of brass instruments was performed using a moveable line array of microphones. Exponential sine sweep measurements were performed for each microphone position, effectively giving synchronised impulse responses at every microphone position in a two-dimensional grid starting directly in front of the bell. Calculations were then carried out to check to what extent the observed field was consistent with the predictions from multimodal theory. The multimodal radiation impedance was only known previously for specific geometries such as the infinite baffle, but here an extension of the theory is set out in order to simulate a trombone radiating within a large radius, infinite length cylindrical pipe.
Kemp , J A , Lopez-Carromero , A & Campbell , M 2017 , Pressure fields in the vicinity of brass musical instrument bells measured using a two dimensional grid array and comparison with multimodal models . in B Gibbs (ed.) , Proceedings of the 24th International Congress on Sound and Vibration . International Congress on Sound and Vibration , International Institute of Acoustics and Vibration , 24th International Congress on Sound and Vibration , London , United Kingdom , 23/07/17 .conference
Proceedings of the 24th International Congress on Sound and Vibration
Copyright 2017 International Institute of Acoustics and Vibration (IIAV). This work has been made available online with permission from the publisher. This is the final published version of the work, which was originally published at https://www.iiav.org/archives_icsv_last/2017_icsv24/content/papers/papers/full_paper_885_20170401002107120.pdf
DescriptionThe research leading to these results has received funding from the People Programme (Marie Curie Actions) of the European Unions Seventh Framework Programme FP7/2007-2013/ under REA grant agreement No. 605867 supporting the BATWOMAN ITN Project.
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