For active materials such as piezoelectric stacks, which produce large force and small displacement, motion amplification mechanisms are often necessary—not simply to trade force for displacement, but to increase the output work transferred through a compliant structure. Here, a new concept for obtaining large rotations from small linear displacements produced by a piezoelectric stack is proposed and analyzed. The concept uses elastic (buckling) and dynamic instabilities of an axially driven buckling beam. The optimal design of the buckling beam end conditions was determined from a static analysis of the system using Euler’s elastica theory. This analysis was verified experimentally. A stack-driven, buckling beam prototype actuator consisting of a pre-compressed PZT stack (140 mm long, 10 mm diameter) and a thin steel beam (60 mm × 12 mm × 0.508 mm) was constructed. The buckling beam served as the motion amplifier, while the PZT stack provided the actuation. The experimental setup, measuring instrumentation and method, the beam preloading condition, and the excitation are fully described in the paper. Frequency responses of the system for three preloading levels and three stack driving amplitudes were obtained. A maximum 16° peak-to-peak rotation was measured when the stack was driven at an amplitude of 325 V and frequency of 39 Hz. The effects of beam preload were also studied.
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ASME 2003 International Mechanical Engineering Congress and Exposition
November 15–21, 2003
Washington, DC, USA
Conference Sponsors:
- Aerospace Division
ISBN:
0-7918-3707-6
PROCEEDINGS PAPER
A Novel Motion Amplifier Using an Axially Driven Buckling Beam
Jie Jiang,
Jie Jiang
Pennsylvania State University, University Park, PA
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Eric M. Mockensturm
Eric M. Mockensturm
Pennsylvania State University, University Park, PA
Search for other works by this author on:
Jie Jiang
Pennsylvania State University, University Park, PA
Eric M. Mockensturm
Pennsylvania State University, University Park, PA
Paper No:
IMECE2003-42317, pp. 89-100; 12 pages
Published Online:
May 12, 2008
Citation
Jiang, J, & Mockensturm, EM. "A Novel Motion Amplifier Using an Axially Driven Buckling Beam." Proceedings of the ASME 2003 International Mechanical Engineering Congress and Exposition. Aerospace. Washington, DC, USA. November 15–21, 2003. pp. 89-100. ASME. https://doi.org/10.1115/IMECE2003-42317
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