Nonlinear, large-strain PZT actuators using controlled structural buckling
Name
Neal-2009-Nonlinear, large-strain PZT actuators using controlled structural buckling.pdf
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Checksum (MD5)
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Author(s)
Asada, Harry
Neal, Devin M.
Date Issued
May 2009
Journal
IEEE International Conference on robotics and and Automation
Publisher
Institute of Electrical and Electronics Engineers
Citation
Neal, D., and H. Asada. “Nonlinear, large-strain PZT actuators using controlled structural buckling.” Robotics and Automation, 2009. ICRA '09. IEEE International Conference on. 2009. 170-175. © 2009, IEEE
Version
Final published version
Abstract
Buckling is a highly nonlinear and singular phenomenon in thin beams, and is usually an undesired characteristic that must be prevented from occurring in engineered systems. Buckling, however, can be a useful mechanism for gaining extremely large displacement amplification, since a tiny displacement in the axial direction of the beam may lead to a large defection in the middle of the beam. This paper presents a novel large-strain piezoelectric actuator exploiting the buckling of a structure with imbedded PZT stacks. Although the free displacement of a PZT stack is only 0.1% of the stack length, the buckling mechanism, controlled with an effective algorithm and strategically placed redirecting stiffness, can produce a large bi-polar displacement that is approximately 150 times larger than the original PZT displacement. Furthermore, the structural buckling produces a pronounced nonlinearity in output impedance; the effective stiffness viewed from the output port varies as a function of output displacement, which can be a useful property for those applications where actuator stiffness needs to vary.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1109/ROBOT.2009.5152762
