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TITLE |
Measurement of strain and stress in a piezoelectric actuator for collocated control |
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著者 |
Dosch, J.J.; Inman, D.J.; Garcia, E. Mech. Syst. Lab., State Univ. of New York, Buffalo, NY, USA |
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発表誌と |
Active Materials and Adaptive Structures. Proceedings of the ADPA/AIAA/ASME/SPIE Conference p.195-8, 1992 4-8 Nov. 1991, Alexandria, VA,USA |
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要旨 |
A technique has been developed which allows a single piece of piezoelectric material to concurrently sense and actuate in a closed loop system. The motivation behind the technique is that such a self-sensing actuator will be truly collocated and has applications in active and intelligent structures, such as vibration suppression. The usefulness of the proposed device was experimentally verified by actively damping the vibration in a cantilever beam. A single piezoceramic element bonded to the base of the beam functioned both as a distributed moment actuator and strain sensor. Using a positive position feedback law the first two modes of vibration were suppressed; the first mode five percent settling time was reduced from 35 to 0.3 seconds and the second mode settling time was reduced from 7 seconds to 0.9 seconds. (2 Refs) |