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Research at St Andrews

Pressure fields in the vicinity of brass musical instrument bells measured using a two dimensional grid array and comparison with multimodal models

Research output: ResearchConference contribution


Jonathan Andrew Kemp, Amaya Lopez-Carromero, Murray Campbell

School/Research organisations


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.


Original languageEnglish
Title of host publicationProceedings of the 24th International Congress on Sound and Vibration
EditorsBarry Gibbs
Publisher International Institute of Acoustics and Vibration
Number of pages8
ISBN (Print)9781906913274
StatePublished - 2017
Event24th International Congress on Sound and Vibration - London, United Kingdom
Duration: 23 Jul 201727 Jul 2017

Publication series

NameInternational Congress on Sound and Vibration
PublisherInternational Institute of Acoustics and Vibration
ISSN (Print)2329-3675


Conference24th International Congress on Sound and Vibration
Abbreviated titleICSV24
CountryUnited Kingdom
Internet address

    Research areas

  • Brass, Radiation, Acoustic, Music, Trombone, Field, Microphone, Array, Multimodal, Theory, Impedance, Infinite, Pipe, Decomposition, MMM, Mode, Matching, Higher, Method, Dipole, Monopole

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ID: 251433269