1 August 2003 Velocity feedback control with time delay using piezoelectrics
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An elastic beam is sandwiched between two thin layers of mono-axially oriented piezoelectric material which act as a distributed vibration control. One layer acts as a distributed sensor while the other behaves as an actuator. A velocity feedback control with time delay is implemented in which the distributed sensor signal which is proportional to the time derivative of the strains is amplified and applied to the actuator after a time delay. Because of the nature of the problem the control action enters as a boundary control. The control effectiveness, changes in natural frequency and damping ratios, is analyzed for the case of a cantilever beam. Comparisons are also made with the uncontrolled case and the zero-delay system.
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John W. Roos, John W. Roos, John C. Bruch, John C. Bruch, James M. Sloss, James M. Sloss, Sarp Adali, Sarp Adali, Ibrahim S. Sadek, Ibrahim S. Sadek, "Velocity feedback control with time delay using piezoelectrics", Proc. SPIE 5049, Smart Structures and Materials 2003: Modeling, Signal Processing, and Control, (1 August 2003); doi: 10.1117/12.482728; https://doi.org/10.1117/12.482728

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