Effect of Bass Bar Tension on Modal Parameters of a Violin’s Top Plate

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Authors

  • Ewa B. SKRODZKA 1. Institute of Acoustics, Adam Mickiewicz University 2. Faculty of String Instruments, Harp, Guitar, and Luthiery, I.J. Paderewski Academy of Music, Poland
  • Bogumił B.J. LINDE Institute of Experimental Physics, University of Gdańsk, Poland
  • Antoni KRUPA Faculty of String Instruments, Harp, Guitar, and Luthiery, I.J. Paderewski Academy of Music, Poland

Abstract

Experimental modal analysis of a violin with three different tensions of a bass bar has been performed. The bass bar tension is the only intentionally introduced modification of the instrument. The aim of the study was to find differences and similarities between top plate modal parameters determined by a bass bar perfectly fitting the shape of the top plate, the bass bar with a tension usually applied by luthiers (normal), and the tension higher than the normal value. In the modal analysis four signature modes are taken into account. Bass bar tension does not change the sequence of mode shapes. Changes in modal damping are insignificant. An increase in bass bar tension causes an increase in modal frequencies A0 and B(1+) and does not change the frequencies of modes CBR and B(1−).

Keywords:

violins, modal analysis, bass bar tension.