An investigation of piezoelectric ring benders and their potential for actuating servo valves

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Abstract

This paper describes the deformation of a piezoceramic disc shaped actuator due to two effects: inner edge mechanical loading and electrical excitation. A 2D axisymmetric coupled-field finite element model was constructed to represent the piezoceramic 'ring bender'. The model was used to predict actuator displacement due to a force applied to the inner edge, and also the piezoelectric induced strain due to an electric field applied in the poling direction of the piezoceramic. Results are compared with theoretical calculations of the deformation of a uniform thickness disc under mechanical load, and the displacement-voltage characteristics reported by the manufacturer. Experimental results for the displacement of the piezoelectric actuator, under a variety of constraint conditions, are also compared. The research presented provides an understanding of how the ring bender deforms under combined mechanical load and electric field. Each of these effects is considered and results show that the shape formed is different depending on whether the load is mechanical or electrical. This result provides an insight into how the actuator may be mounted for use as an actuator in servo valve pilot stage.

Original languageEnglish
Title of host publicationASME/BATH 2014 Symposium on Fluid Power and Motion Control, FPMC 2014
PublisherAmerican Society of Mechanical Engineers (ASME)
PagesV001T01A034
ISBN (Print)9780791845974
DOIs
Publication statusPublished - 2014
EventASME/BATH 2014 Symposium on Fluid Power and Motion Control, FPMC 2014 - Bath, UK United Kingdom
Duration: 10 Sep 201412 Sep 2014

Conference

ConferenceASME/BATH 2014 Symposium on Fluid Power and Motion Control, FPMC 2014
CountryUK United Kingdom
CityBath
Period10/09/1412/09/14

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Bertin, M. J. F., Plummer, A. R., Bowen, C. R., & Johnston, D. N. (2014). An investigation of piezoelectric ring benders and their potential for actuating servo valves. In ASME/BATH 2014 Symposium on Fluid Power and Motion Control, FPMC 2014 (pp. V001T01A034). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/FPMC2014-7852