Caractérisation large bande du comportement dynamique linéaire des structures hétérogènes viscoélastiques anisotropes : application à la table d'harmonie du piano

Abstract : The present work, as part of the MAESSTRO ANR project, is motivated by the replacement of wood by composite material in the design of the piano soundboard. The main focus is on the characterization of the mechanical properties of both replaced and replacement materials in a wide frequency range, taking into account anisotropy, heterogeneous and viscoelastic behavior. First, the wave propagation in such structures is investigated; boundary conditions and loads are discarded to focus on the mechanisms responsible for the energy transmission in the media. The footprint of the complex behavior of the studied structures is represented and interpreted via the dispersion surfaces. Second, a robotized setup is proposed, allowing for the measurement of the full-field instantaneous 3D velocity along the surface of structures submitted to a repeated dynamic load. Third, identification methods using this experimental data are proposed. Based on the parameters of a reduced signal model of the measurement identified with an original ESPRIT method, inverse eigenvalue problems are formulated. Both transient and steady regime are investigated, respectively through modal analysis and the proposed wavevector analysis. The proposed methods are validated through applications on homogeneous beams and anisotropic plates. Finally, the overall proposed procedure is applied for the identification of the material properties of the soundboard of the Stephen Paulello technologies SP190// grand piano
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Pierre Margerit. Caractérisation large bande du comportement dynamique linéaire des structures hétérogènes viscoélastiques anisotropes : application à la table d'harmonie du piano. Mécanique des matériaux [physics.class-ph]. Université Paris-Est, 2018. Français. ⟨NNT : 2018PESC1151⟩. ⟨tel-02304886⟩

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