Prestress effects on the eigenfrequencies of the soundboards: Experimental results on a simplified string instrument

Adrien Mamou-Mani 1 Sylvie Le Moyne 2 François Ollivier 2 Charles Besnainou Joël Frelat 3
1 Equipe Acoustique instrumentale
STMS - Sciences et Technologies de la Musique et du Son
2 IJLRDA-MPIA - Modélisation, Propagation et Imagerie Acoustique
DALEMBERT - Institut Jean Le Rond d'Alembert
Abstract : This paper presents an experimental study of the effects of prestresses on the vibration behavior of string instruments. These prestresses are created by gluing ribs (crowning) and tensioning string (downbearing). The effects of these prestresses were previously studied numerically for a piano soundboard by Mamou-Mani et al. [J. Acoust. Soc. Am. 123, 2401–2406 (2008)] and analytically for simplified models by Mamou-Mani et al. [Acta Acust. Unit. Acust. 95, 915–926 (2009)]. In the present study, a specified test bench is designed, including a simplified soundboard (a rectangular plate), a bridge, and a single string. The plate is subjected to in-plane and transverse loads. Vibrational eigenmodes are identified using nearfield acoustical holography (NAH) measurement. The evolution of eigenfrequencies with these specific prestresses is studied. The results show the effectiveness of NAH for this purpose and a very good qualitative concordance with previous numerical and analytical calculus.
Type de document :
Article dans une revue
Journal of the Acoustical Society of America, Acoustical Society of America, 2012, 131 (1), pp.872 - 877. 〈10.1121/1.3651232〉
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Soumis le : mercredi 13 septembre 2017 - 16:33:30
Dernière modification le : mercredi 21 mars 2018 - 18:58:17

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Adrien Mamou-Mani, Sylvie Le Moyne, François Ollivier, Charles Besnainou, Joël Frelat. Prestress effects on the eigenfrequencies of the soundboards: Experimental results on a simplified string instrument. Journal of the Acoustical Society of America, Acoustical Society of America, 2012, 131 (1), pp.872 - 877. 〈10.1121/1.3651232〉. 〈hal-01587110〉

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