180 - Piano string vibrations and the role of the duplex scale
Stulov A.
Abstract
Estonia Piano Factory is among the few companies in the world that build their pianos with movable double duplex scale. It enables the technicians to change the tuning according to their wishes and necessary acoustics. The special sample of Parlour Grand Piano Estonia L190 was fabricated for experimental studies. Using B&K impact hammer and accelerometers attached to the bridge as a tool, the frequency response functions and the two dimensional motion of piano treble bridge were examined. The influence of the duplex scale and its tuning on the treble bridge admittance was investigated. It was shown that the amplitude of the longitudinal motion of the treble bridge depends on the lengths of the parts of the strings passing the bridge and attached to the hitch-pin rail of the frame. The mechanism by which the longitudinal vibrations couple to the bridge motion has also been considered. These results should prove extremely useful in developing an accurate model of the real string excitation by piano hammer.
Citation
Stulov A.: Piano string vibrations and the role of the duplex scale, CD-ROM Proceedings of the Thirtheenth International Congress on Sound and Vibration (ICSV13), July 2-6, 2006, Vienna, Austria, Eds.: Eberhardsteiner, J.; Mang, H.A.; Waubke, H., Publisher: Vienna University of Technology, Austria, ISBN: 3-9501554-5-7
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