Loading…
This event has ended. Visit the official site or create your own event on Sched.
Welcome to ICSV26!
Back To Schedule
Wednesday, July 10 • 17:30 - 17:50
VIBROACOUSTICS OF THE MUSICAL SAW: EXPERIMENTAL MEASUREMENTS OF TRAPPED MODE SHAPES AND FREQUENCIES VS. BLADE CURVATURE

Log in to save this to your schedule, view media, leave feedback and see who's attending!

Feedback form is now closed.
The musical saw is a popular folk instrument consisting of a flexible hand saw that is bent into an 'S'-shape by the performer. The large end of the saw, containing the handle, is typically held in place between the player's knees. The tapered end of the blade is manipulated with one hand such that curvatures of opposite sign occur on either side of an inflection point. With appropriate critical curvatures on either side, highly resonant vibrational modes may be trapped near the inflection point. These confined modes exhibit high Q, as they are not affected by damping at the ends of the saw. The musician applies a violin bow to the smooth edge of the saw, near the inflection point, producing a very pure tone whose frequency is varied by changing the curvature of the blade in real time. Skilled performers can produce intricate melodies, as well as a variety of glissando and vibrato effects. Resonant frequencies and deflection shape images are obtained for a variety of static deflections of a clamped saw blade using electronic speckle-pattern interferometry. With this geometry, the fundamental mode (2,0) contains two nodal lines running parallel to the long axis of the blade. Data and images for higher frequency overtones are also shown for the curvatures studied. The shapes, frequencies, and spatial extents of the trapped modes are reported and analyzed as functions of the blade curvature. Trends in these experimental results are compared with those obtained using finite element software. Connections with published theory are also presented.

Moderators
TH

Thomas Hélie

Dr., CNRS, STMS Lab (IRCAM-CNRS-SU)

Authors

Wednesday July 10, 2019 17:30 - 17:50 EDT
Westmount 5
  T14 Musical acoustic, SS01 Vibroac of musical instrum