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|Type:||Artigo de evento|
|Title:||Low Frequency Model Of The Sound Radiated By A Concert Harp|
|Author:||Le Carrou J.-L.|
De Franca Arruda J.R.
|Abstract:||The concert harp, asmost string instruments, is a complex sound radiator. The aim of this study is to propose a low frequency model of its sound radiation based on multiple monopoles. For this purpose, the radiated acoustic pressure was measured in a semi-anechoic room at more than 600 measurement points over a nearly hemi-spherical surface. Three locations along the soundboard plate were excited with an electronic shaker driven by a white noise signal, permitting the measurement of directivity diagrams. An acoustic monopole distribution is proposed to model the radiated sound in the low frequency range. Estimation of equivalent sources based first on a single monopole description then on a two monopoles description is carried out. The single monopole model is not found to be a physical solution of the sound radiated by the harp. The two monopoles model takes into account both the sound radiation of the soundboard and that of the sound holes located at the back of the soundbox. Computation of their volume velocities and of their positions is obtained by the use of a least squares method. Results show that these equivalent sources are on the symmetry plane of the harp and that this two monopoles description can be considered as a good model of the sound radiated by the harp.|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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