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Prédiction des mécanismes vibroacoustiques des plaques orthotropes raidies de formes quelconques : Application à la table d’harmonie de piano

Abstract : Ribbed structures are a current subject of study and they are often used in many industrial domain. Indeed, there use offers some advantages as for example in automotive domain to reduce the weight of vehicule that is an important actual constrain. In the musical domain ribbed structures are also often used and musical instruments mixed structural, perceptive and subjective considerations. In that domain, one of the main difficulties is to translate the language between the science and the music and to make equivalence between phenomena describe by the musicians and scientific indicators. The piano soundboard is a typical example of these ribbed structures and difficulties reported by piano makers are many. Nowadays, numerical computing resources allow to take into account some phenomena in modeling but as a consequence, it appears a “black box effect” between input and output data. Taking into account less parameters, reduced models offer the advantage to separate the influence of each parameter in the final result. Taking into account as starting point a simply supported rectangular plate with special orthotropy, the edges of the soundboard are described by an addition of punctual springs in the fictive domain. Coupling to it some stiffeners on the both faces, it is possible to calculate the vibratory behavior of the instrument such as the acoustic radiation through the acoustical radiation impedances of the baffled simply supported plate. This simplified analytical modeling is representative of phenomena found in the literature and is also well adapted to parametrical studies. So, it highlights the space localizations of vibration, due to the conception of the instrument, and allows studying the influence of structural parameters on the mobility along the bridge, the acoustical radiated power for example. In order to qualify, with a reduced computing cost, the influence of structural parameters on the perceived sound, this analytical model for ribbed structure is coupled to a string and solved in time domain.
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Submitted on : Friday, November 30, 2018 - 3:39:08 PM
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  • HAL Id : tel-01451727, version 3

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Benjamin Trévisan. Prédiction des mécanismes vibroacoustiques des plaques orthotropes raidies de formes quelconques : Application à la table d’harmonie de piano. Matériaux. Université de Lyon, 2016. Français. ⟨NNT : 2016LYSEI146⟩. ⟨tel-01451727v3⟩

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