A generalised approach to torsionality maximisation in longitudinal-torsional ultrasonic devices

Al-Budairi, H. , Harkness, P. and Lucas, M. (2011) A generalised approach to torsionality maximisation in longitudinal-torsional ultrasonic devices. In: 40th Annual Symposium of the Ultrasonic Industry Association, Glasgow, UK, 23-25 May 2011,

Al-Budairi, H. , Harkness, P. and Lucas, M. (2011) A generalised approach to torsionality maximisation in longitudinal-torsional ultrasonic devices. In: 40th Annual Symposium of the Ultrasonic Industry Association, Glasgow, UK, 23-25 May 2011,

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Abstract

A longitudinal-torsional vibration mode has many applications in ultrasonic systems. Obtaining this behaviour could be achieved either by coupling the longitudinal and torsional modes or by degenerating the longitudinal mode, but the results may be unsatisfactory. These methods have many disadvantages including the expense and complexity in operation, the possibility of coupling unwanted bending modes, and the low responsiveness and torsionality. In this work, we employed a geometric modification to a traditional Langevin transducer to overcome these disadvantages. This was achieved by incorporating helical slits and exponential geometry features in the front mass of the transducer. Finite element analysis and vibration response measurements show that this strategy prevents coupling of bending modes, increases responsiveness, reduces energy losses, and produces high torsionality.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Lucas, Professor Margaret and Harkness, Dr Patrick and Al-Budairi, Dr Hassan
Authors: Al-Budairi, H., Harkness, P., and Lucas, M.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
College of Science and Engineering > School of Engineering > Systems Power and Energy
Copyright Holders:Copyright © 2011 The Authors
Publisher Policy:Reproduced with the permission of the authors.

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