title: Coupling and degenerating modes in longitudinal-torsional step horns.
abstract: Longitudinal-torsional vibration is used and proposed for a variety of ultrasonic applications including motors, welding, and rock-cutting. To obtain this behavior in an ultrasonic step horn one can either, (i) couple the longitudinal and torsional modes of the horn by incorporating a ring of diagonal slits in the thick base section or, (ii) place helical flutes in the thin stem section to degenerate the longitudinal mode into a modified behavior with a longitudinal-torsional motion. This paper compares the efficacy of these two design approaches using both numerical and experimental techniques.
authors: School of Engineering, University of Glasgow, Glasgow, UK. patrick.harkness@glasgow.ac.uk
authors: Patrick
authors: P
authors: Harkness
authors: Margaret
authors: M
authors: Lucas
authors: Andrea
authors: A
authors: Cardoni