Archives of Acoustics, 5, 2, pp. 147-156, 1980

Influence of ribs on the acoustic behaviour of piano resonant plates

U. Muller
Institut far Musikinstrumentenbau
Germany

The eigenfrequencies and vibrational modes of a simply supported stiffened rectangular plate are determined by means of perturbation method. Additional eigenmodes are excited by the presence of ribs and the eigenfrequencies are shifted. A qualitative evaluation of the influence of these additionally excited modes on the sound radiated shows that under certain conditions the ribs can improve the sound radiation of a resonant plate.
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