Caractérisation du rayonnement de la table d'harmonie d'un piano droit

In this paper we present a simple model of a upright piano soundboard as a baffled isotrope plate. This model enables us to calculate analytically the sound radiation of the soundboard in the back semi-infinite space of the piano and to find the frequency threshold of the appearance of the lobe of maximum pressure for each mode. These results are compared with measurements on a real upright piano. We find that the resonance frequency of the modes are less than this frequency threshold, therefore the maximum sound radiation can not occur. The pattern of the sound radiation appears to follow the theoretical model but more experiments will be required to show this clearly