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The grand piano is one of the most important instruments in western music.Its functioning and details are investigated and understood to a reasonablelevel, however, differences between manufacturers exist which are hard toexplain. To add a new piece of understanding, we decided to investigate theeffect of ribs mounted on a soundboard. Apart from pianos, this is important toa wider class of instruments which radiate from a structured surface. Fromscattering theory, it is well-known that a regular array of scatterers yields aband structure. By a systematic study of the latter, the effect of the ribs onthe radiated spectrum is demonstrated for a specially manufactured multichordmimicking topologically a piano soundboard. To distinguish between radiatedsound and sound propagated inside the board we use piezopolymers, aninnovative, non-invasive technique. As a result we find a dramatic change inthe spectrum allowed to propagate in the soundboard which is consequentlyradiated. An explanation by a simple model of coupled oscillators is given witha very nice qualitative coincidence.

The effect of Mounted Ribs on the Radiation of a Soundboard