A Self-Sensing Piezoelectric Actuator for Collocated Control

DOI Web Site 被引用文献62件
  • Jeffrey J. Dosch
    Mechanical Systems Laboratory Department of Mechanical and Aerospace Engineering 1012 Furnas Hall State University of New York at Buffalo Buffalo, NY 14260
  • Daniel J. Inman
    Mechanical Systems Laboratory Department of Mechanical and Aerospace Engineering 1012 Furnas Hall State University of New York at Buffalo Buffalo, NY 14260
  • Ephrahim Garcia
    Department of Mechanical Engineering Vanderbilt University Nashville, TN 37203

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<jats:p> A technique has been developed which allows a single piece of piezoelec tric 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. A theoreti cal basis for the self-sensing actuator is given in terms of the electromechanical consti tutive equations for a piezoelectric material. In a practical implementation of the self- sensing actuator an electrical bridge circuit is used to measure strain. The bridge circuit is capable of measuring either strain or time rate of strain in the actuator. </jats:p><jats:p> 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 rate feedback control law, the first mode of vibration was suppressed, reducing the settling from 35 seconds to 2.5 seconds. Using a positive position feedback law the first two modes of vibration were suppressed; the first mode settling time was reduced from 35 to 0.3 sec onds and the second mode settling time was reduced from 7 seconds to 0.9 seconds. </jats:p>

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