Derveaux, Grégoire (2002) Modélisation numérique de la guitare acoustique. PhD thesis Mathématiques appliquées, ENSTA UMA UME / INRIA / CNRS UMR 2706 - POEMS Propagation des Ondes : Etude Mathematique et Simulation, EP/X p.382.
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Abstract
The purpose of this study is the time-domain numerical modelisation of the acoustic guitar. The method consists in the modeling of the vibratory and acoustical phenomena from the initial pluck to the 3-D radiation. An idealized plucking force is acting on a 1-D damped string model. The string is coupled to the soundboard via the bridge. The soundboard is modeled as an orthotropic heterogeneous damped Kirchhoff-Love plate, with a soundhole, clamped at its boundaries. The other parts of the body (back, neck, sides...) are assumed to be perfectly rigid. The plate radiates both inside the cavity and in the external free field. The modeling of the complete 3D sound field is a new approach comparing to almost all previous works on the guitar, where the cavity is taken into account as a simple oscillator.
We obtain a system of partial differential equations which are solved numerically in the time-domain. We use a specific spectral method for solving the Kirchhoff-Love's dynamic plate model. For the string equation and the sound radiation, we use a standard mixed method for the space discretization and centered finite differences in time. The fluid-structure interaction is solved by the use of the fictitious domain method which permits us to take into account the geometry of the guitar inside a uniform cubic mesh for the calculation of the 3D sound radiation. The originality of the proposed scheme is a stable coupling method between a continuous time resolution and a discrete one. A great number of numerical simulations are realized, which show the validity of the method and the very large possibilities of this
| Item Type: | PhD Thesis (PhD) |
|---|---|
| Thesis Supervisor: | Joly, Patrick |
| Date: | June 2002 |
| Ecole Doctorale: | ED 447 ECOLE DOCTORALE DE L'ECOLE POLYTECHNIQUE |
| Discipline: | Mathématiques appliquées |
| Collection (Fonds): | EP/X ENSTA |
| Institution: | EP/X |
| Department: | ENSTA UMA UME / INRIA / CNRS UMR 2706 - POEMS Propagation des Ondes : Etude Mathematique et Simulation |
| Subjects: | 2. Information and Communication Sciences and Technologies 1. Mathematics and Applications |
| Uncontrolled Keywords: | Kirchhoff-Love's plate model, modèle de Kirchhoff-Love, Fluid-structure interaction, Interaction fluide-structure, Damping mechanisms, Phénomènes d'amortissement, Mixed finite elements, éléments finis mixtes, Mass lumping, Condensation de masse, Numerical dispersion, Dispersion numérique, Fictitious domain method, Méthode de domaines fictifs, Spectral method, Méthode spectrale, Energy method, Méthodes énergétiques, Stability, Stabilité |
| ID Code: | 2585 |
|---|---|
| Deposited By: | Laurence Vidament |
| Deposited On: | 24 October 2007 |
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