Sound power and vibration levels for two different piano soundboards

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Squicciarini, Giacomo^1 ; Valiente, Pablo Miranda^2 ; Thompson, David J.^1

Institute of Sound and Vibration Research, University of Southampton, Highfield, Southampton

SO17 1BJ, United Kingdom^1

1530 Llewellyn Jones, Santiago, Chile^2

关键词: Acceleration response;    Acoustic response;    Driving points;    Manufacturing procedure;    Mid-high frequencies;    String tension;    Transfer mobility;    Vibration level;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012091/pdf
DOI  :  10.1088/1742-6596/744/1/012091

来源: IOP

【 摘 要 】

This paper compares the sound power and vibration levels for two different soundboards for upright pianos. One of them is made of laminated spruce and the other of solid spruce (tone-wood). These differ also in the number of ribs and manufacturing procedure. The methodology used is defined in two major steps: (i) acoustic power due to a unit force is obtained reciprocally by measuring the acceleration response of the piano soundboards when excited by acoustic waves in reverberant field; (ii) impact tests are adopted to measure driving point and spatially-averaged mean-square transfer mobility. The results show that, in the midhigh frequency range, the soundboard made of solid spruce has a greater vibrational and acoustic response than the laminated soundboard. The effect of string tension is also addressed, showing that is only relevant at low frequencies.