Development of Piano Player. 1st Report, Analysis of Behavior of Piano-Action until String-Striking of Hammer.
Eiji Hayashi, Masami Yamane, Hajime Mori · TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C · 1994
Production of a soft tone on the piano is difficult even for pianists. To determine the input waveform for the stable swing stroke which produces the soft tone, this paper has studied the movement of the piano's hammer until it strikes a string. A simple dynamic model of the piano-action is proposed, and the movements in the model are analyzed. In addition, movement of the hammer when the key was struck by a developed actuator is measured. On the basis of our analysis, it can be said that the calculated behavior shows good agreement with the measured one. This indicates that the proposed model is useful, especially since can clearly show the behavior of the hammer. The desirable input waveform for the swing stroke leading to the soft tone is determined, and the stable swing stroke can then be achieved.