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research-article

DYNAMIC FLEXOELECTRIC ACTUATION AND CONTROL OF BEAMS

[+] Author and Article Information
Mu Fan

State Key Laboratory of Mechanics and Control of Mechanical Structures, Interdisciplinary Research Institute of Aeronautics and Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, China; Room 217, Building A18, #29 Yu Dao Street, Nanjing, 210016, P.R. China
mfanz@nuaa.edu.cn

Bolei Deng

StrucTronics and Control Lab, School of Aeronautics and Astronautics, Zhejiang University, Hangzhou, China; Address: School of Aeronautics and Astronautics, Zhejiang University, Hangzhou, China
dengbolei@zju.edu.cn

Hornsen Tzou

ASME Fellow, State Key Laboratory of Mechanics and Control of Mechanical Structures, Interdisciplinary Research Institute of Aeronautics and Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, China; Room 202, Building A18, #29 Yu Dao Street, Nanjing, 210016, P.R. China
hstzou@nuaa.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039238 History: Received May 04, 2017; Revised January 05, 2018

Abstract

A flexoelectric cantilever beam actuated by the converse flexoelectric effect is evaluated and its analytical and experimental data are compared in this study. A line-electrode on the top beam surface and a bottom surface electrode are used to generate an electric field gradient in the beam, so that internal stresses can be induced and applied to distributed actuations. Dynamic control effectiveness of the beam is investigated with a mathematical model and later validated by laboratory experiments. Analyses show that the actuation stress induced by the converse flexoelectric effect is in the longitudinal direction and results in a bending control moment to the flexoelectric beam since the stress in the thickness is inhomogeneous. It is found that thinner line-electrode radius and thinner flexoelectric beam lead to larger control effects on the beam. The position of the line-electrode on the top surface of the beam also influences the control effect. When the line electrode is close to the fixed end, it induces a larger tip displacement than that is close to the free end. Analytical results agree well with laboratory experimental data. This study of flexoelectric actuation and control provides a fundamental understanding of flexoelectric actuation mechanisms.

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