Observations of Torsion on Bowed Strings
* Presenting author
Translational and torsional vibrations on bowed strings are well investigated, leaving the torsion with the less important role. Present models and simulations of the stick-slip interaction gain fidelity while incorporating limited bow hair elasticity, string stiffness, or bow width, but they do not explain some recent observations of collaboration between translational and torsional vibrations on the string. Torsion is measured on both sides of the bow contact point for a variety of bridge-bow distances on a cello string. Torsional vibrations decline over the course of the stick phase but then regain strength when the next release comes near. Phase relations between torsional impulses and instants of release / sticking suggest a rather important role: torsional impulses strongly co-determine the stick-slip action.