MECHANICAL IMPEDANCE OF A PIANO SOUNDBOARD

An experimental study of the mechanical impedance Z of a piano soundbo ard in the frequency range similar to 50-10(4) Hz is reported. The res ults differ significantly from the behavior reported by Wogram above a few kHz, but are consistent with the measurements of Conklin. The dat a presented here are also in good agreement with the predictions of ou r recent numerical calculations. Those calculations found that the sou ndboard ribs have an important effect on the frequency dependence of Z above a few kHz, and our measurements confirm that prediction. (C) 19 98 Acoustical Society of America.