Modal analysis and finite element modelling of a grand piano soundboard

The main purpose of this paper is to illustrate the present state of a project aimed at developing and validating a numerical model of a grand piano soundboard. The attention is focused on the comparison between the soundboard vibration modes before and after gluing it to the piano structure. To do so experimental modal analysis campaigns were performed on the soundboard in these two conditions and a finite element model corresponding to the two analyzed construction stages is developed. Peculiarly to the approach adopted, the manufacturing process is reproduced in the model in order to obtain the exact configuration of the soundboard in terms of curvature and internal stresses, since these quantities have an important influence on the vibrational behavior of the soundboard. The final objective will be that of providing support to the entire design process of a new musical instrument.