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Published on: March 19, 2016
Coupling and degenerating modes in longitudinal-torsional step horns
Patrick Harkness1, Margaret Lucas, Andrea Cardoni
1School of Engineering, University of Glasgow, Glasgow, UK. patrick.harkness@glasgow.ac.uk
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.
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