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Effect of Vibration Properties of a Resonance Board on Piano Timbre

Miao, Yuanyuan, Liu, Zhenbo, Shen, Jun, Liu, Yixing
Forest products journal 2016 v.66 no.1-2 pp. 126-133
Picea glehnii, Picea jezoensis, Picea sitchensis, modulus of elasticity, vibration
The resonance board is one of the most important components of a piano and greatly affects the piano's timbre. The vibration properties of eight resonance boards made from Picea glehnii, Picea jezoensis, Picea spinulosa, and Picea sitchensis were analyzed using the spectrum analysis method of the fast Fourier transform following vibration theory. The modulus of elasticity (E) and velocity of vibration transmission (C) of each resonance board were calculated. After the resonance boards were incorporated into pianos, the mean amplitude, ratio of maximum to minimum amplitudes, and mean ratio of successive amplitudes of resonant frequencies for 36 typical keys of each piano were obtained from the frequency spectrum. The correlation between a piano's timbre and the resonance board's vibration properties was analyzed. The results show that the piano timbre improves with increasing E and C, especially in the y direction of the resonance board.