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Contactless coupling of dielectric elastomer membranes with magnetic repulsion

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Original languageEnglish
Title of host publicationElectroactive Polymer Actuators and Devices (EAPAD) XXI
EditorsYoseph Bar-Cohen
Publisher or commissioning bodySociety of Photo-Optical Instrumentation Engineers (SPIE)
DOIs
DateAccepted/In press - 29 Oct 2018
DatePublished (current) - 13 Mar 2019
EventElectroactive Polymer Actuators and Devices (EAPAD) 2019 - Denver, United Kingdom
Duration: 4 Mar 20187 Mar 2019

Publication series

NameProceedings of SPIE
PublisherSociety of Photo-optical Instrumentation Engineers (SPIE)
Volume10966
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceElectroactive Polymer Actuators and Devices (EAPAD) 2019
CountryUnited Kingdom
CityDenver
Period4/03/187/03/19

Abstract

Dielectric elastomer (DE) actuators such as conventional double cone configurations have demonstrated that coupled DE membranes can be rigidly-coupled to execute antagonistic out-of-plane actuation. This paper presents experimental analysis of the compliant coupling in the emerging magnetically-coupled DE actuator (MCDEA) design, which exploits contactless magnetic repulsion to create a frictionless coupling between DE membranes. The compliance of this coupling enables the advantage of having two different actuation modes: antagonistic reciprocation and bi-directional expansion. However, since this compliance adds an additional degree-of-freedom, it increases the complexity of the actuator’s dynamics because the coupling distance can exhibit oscillatory behavior that is distinct from each of the actuator’s output oscillations in terms of phase difference and frequency. In this work, the relationship between DEA membrane stiffness and required magnetic force is experimentally analyzed before we present an investigation into the phase space of the compliant coupling and its relationship with the stroke amplitude. It is shown that the fundamental frequency of the MCDEA’s output stroke (46.1 Hz) corresponds to a super-harmonic frequency of the magnetic coupling that is double that of the output. The fundamental frequency of the coupling (87.6 Hz) is found to correspond to a second resonant peak in the MCDEA’s output with a much lower amplitude than at 46.1 Hz. This suggests that the dynamics can be exploited by controlling the excitation frequency for unidirectional push/pull or bidirectional expansion/contraction actuation, which creates potential for new compliant DE actuator and generator designs.

    Research areas

  • resonance, antagonistic actuation, magnetic biasing force, compliant coupling, Dielectric elastomer actuator

Event

Electroactive Polymer Actuators and Devices (EAPAD) 2019

Duration4 Mar 20187 Mar 2019
CityDenver
CountryUnited Kingdom
Degree of recognitionInternational event

Event: Conference

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Documents

  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via SPIE at https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10966/2522127/Contactless-coupling-of-dielectric-elastomer-membranes-with-magnetic-repulsion/10.1117/12.2522127.short?SSO=1. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 652 KB, PDF document

DOI

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