Coupling and degenerating modes in longitudinal–torsional step horns

Harkness, P. , Lucas, M. and Cardoni, A. (2012) Coupling and degenerating modes in longitudinal–torsional step horns. Ultrasonics, 52(8), pp. 980-988. (doi: 10.1016/j.ultras.2012.05.002) (PMID:22770885)

Full text not currently available from Enlighten.


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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Cardoni, Dr Andrea and Lucas, Professor Margaret and Harkness, Professor Patrick
Authors: Harkness, P., Lucas, M., and Cardoni, A.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Ultrasonics
ISSN (Online):1874-9968
Published Online:30 May 2012

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
453421Ultrasonic drilling and coring for planetary astrobiological applicationsMargaret LucasScience & Technologies Facilities Council (STFC)ST/F003587/1Systems Power and Energy