Nonlinear, large-strain PZT actuators using controlled structural buckling
Author(s)Asada, Harry; Neal, Devin M.
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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.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
IEEE International Conference on robotics and and Automation
Institute of Electrical and Electronics Engineers
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
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INSPEC Accession Number: 10749134