Vibration Characterisation of Cymbal Transducers for Power Ultrasonic Applications

Bejarano, F., Feeney, A. and Lucas, M. (2012) Vibration Characterisation of Cymbal Transducers for Power Ultrasonic Applications. In: Modern Practice in Stress and Vibration Analysis 2012 (MPSVA 2012), Glasgow, Scotland, 29-31 Aug 2012, (doi: 10.1088/1742-6596/382/1/012063)

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A Class V cymbal flextensional transducer is composed of a piezoceramic disc or ring sandwiched between two cymbal-shaped shell end-caps. These end-caps act as mechanical transformers to convert high impedance, low radial displacement of the piezoceramic into low impedance, large axial motion of the end-cap. The cymbal transducer was developed in the early 1990's at Penn State University, and is an improvement of the moonie transducer which has been in use since the 1980's. Despite the fact that cymbal transducers have been used in many fields, both as sensors and actuators, due to its physical limitations its use has been mainly at low power intensities. It is only very recently that its suitability for high amplitude and high power applications has been studied, and consequently implementation in this area of research remains undeveloped. This paper employs experimental modal analysis (EMA), vibration response measurements and electrical impedance measurements to characterise two variations of the cymbal transducer design, both aimed at incorporation in ultrasonic cutting devices. The transducers are fabricated using the commercial Eccobond 45LV epoxy adhesive as the bonding agent. The first cymbal transducer is of the classic design where the piezoceramic disc is bonded directly to the end-caps. The second cymbal transducer includes a metal ring bonded to the outer edge of the piezoceramic disc. The reason for the inclusion of this metal ring is to improve the mechanical coupling with the end-caps. This would therefore make this design particularly suitable for power ultrasonic applications, reducing the possibility of debonding at the higher ultrasonic amplitudes. The experimental results demonstrate that the second cymbal design is a significant improvement on the more classic design, allowing the transducer to operate at higher voltages and higher amplitudes, exhibiting a linear response over a practical power ultrasonic device driving voltage range. The results also show that the device can be accurately tuned using finite element modelling and that the cymbal exhibits a modal response as predicted by the finite element models.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Feeney, Dr Andrew and Lucas, Professor Margaret and Bejarano, Mr Fernando
Authors: Bejarano, F., Feeney, A., and Lucas, M.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Publisher:Institute of Physics
ISSN (Online):1742-6596
Published Online:22 August 2012
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
5006112008-12 Doctoral Training GrantMary GoodmanEngineering & Physical Sciences Research Council (EPSRC)EP/P50418X/1VICE PRINCIPAL RESEARCH & ENTERPRISE
490651Miniature Ultrasonic Cutting Devices for High Precision Minimal Access Orthopaedic Surgical ProceduresMargaret LucasEngineering & Physical Sciences Research Council (EPSRC)EP/G046948/1ENG - ENGINEERING SYSTEMS POWER & ENERGY