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. 2018 Mar 4;18(3):779. doi: 10.3390/s18030779

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The frequency response spectrum testing for the GMS actuator. (a) The hanging GMS actuator; (b) The frequency response spectrum of the PZT sensor; (c) The sweep waveform; (d) The frequency response spectrum of the GMS actuator.