A Comparison Between Two and Three-Dimensional Simulations of Finite Amplitude Sound Waves in a Trumpet

Janelle Resch (), Lilia Krivodonova () and John Vanderkooy ()
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Janelle Resch: University of Waterloo, Department of Applied Mathematics
Lilia Krivodonova: University of Waterloo, Department of Applied Mathematics
John Vanderkooy: University of Waterloo, Department of Physics and Astronomy

A chapter in Mathematical and Computational Approaches in Advancing Modern Science and Engineering, 2016, pp 481-492 from Springer

Abstract: Abstract Simplifying a three-dimensional problem of simulating sound propagation in musical instruments is frequently done by exploiting axial symmetry and reducing the problem to one or two dimensions. We examine if such dimension reduction is valid. We numerically solve the equations of motion of compressible gases using the discontinuous Galerkin method to model nonlinear sound propagation inside a trumpet. The numerical results in two and three dimensions are then compared with experimental data. Experiments were carried out on a trumpet in which the sound pressure waves of the B 3 b and B 4 b notes played at forte were recorded. We found that it is crucial to consider the problem with all three spatial dimensions to ensure reflections in the bell region are properly modelled. Additionally, the shape of flare must be carefully approximated to compute the propagating waves accurately.

Keywords: Pressure Waveform; Sound Propagation; Discontinuous Galerkin Method; Musical Note; Bell Shape (search for similar items in EconPapers)
Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-319-30379-6_44

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DOI: 10.1007/978-3-319-30379-6_44

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