University of Oulu

Katja Poikselkä et al 2017 Smart Mater. Struct. 26 095022

Novel genetically optimised high-displacement piezoelectric actuator with efficient use of active material

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Author: Poikselkä, Katja1; Leinonen, Mikko2; Palosaari, Jaakko2;
Organizations: 1Department of Computer Science and Engineering, University of Oulu, Erkki Koiso-Kanttilan katu 3, FI-90570 Oulu, Finland
2Microelectronics Research Unit, University of Oulu, Erkki Koiso-Kanttilan katu 3, FI-90570 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: IOP Publishing, 2017
Publish Date: 2018-08-09


This paper introduces a new type of piezoelectric actuator, Mikbal. The Mikbal was developed from a Cymbal by adding steel structures around the steel cap to increase displacement and reduce the amount of piezoelectric material used. Here the parameters of the steel cap of Mikbal and Cymbal actuators were optimised by using genetic algorithms in combination with Comsol Multiphysics FEM modelling software. The blocking force of the actuator was maximised for different values of displacement by optimising the height and the top diameter of the end cap profile so that their effect on displacement, blocking force and stresses could be analysed. The optimisation process was done for five Mikbal- and two Cymbal-type actuators with different diameters varying between 15 and 40 mm. A Mikbal with a Ø 25 mm piezoceramic disc and a Ø 40 mm steel end cap was produced and the performances of unclamped measured and modelled cases were found to correspond within 2.8% accuracy. With a piezoelectric disc of Ø 25 mm, the Mikbal created 72% greater displacement while blocking force was decreased 57% compared with a Cymbal with the same size disc. Even with a Ø 20 mm piezoelectric disc, the Mikbal was able to generate ~10% higher displacement than a Ø 25 mm Cymbal. Thus, the introduced Mikbal structure presents a way to extend the displacement capabilities of a conventional Cymbal actuator for low-to-moderate force applications.

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Series: Smart materials & structures
ISSN: 0964-1726
ISSN-E: 1361-665X
ISSN-L: 0964-1726
Volume: 26
Issue: 9
Article number: 095022
DOI: 10.1088/1361-665X/aa770a
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The authors gratefully acknowledge funding by the Academy of Finland for the Evolutionary Active Materials Project (no. 140410). Author Jari Juuti acknowledges funding by the Academy of Finland (project numbers 273663 and 267573).
Academy of Finland Grant Number: 140410
Detailed Information: 140410 (Academy of Finland Funding decision)
273663 (Academy of Finland Funding decision)
267573 (Academy of Finland Funding decision)
Copyright information: © Copyright 2017 IOP Publishing. Published in this repository with the kind permission of the publisher.