Comparison of drive amplifier for piezoelectric actuators

Douglas K. Lindner; Nikola Vujic; Donald J. Leo

doi:10.1117/12.429667

14 June 2001 Comparison of drive amplifier for piezoelectric actuators

Douglas K. Lindner, Nikola Vujic, Donald J. Leo

Proceedings Volume 4332, Smart Structures and Materials 2001: Industrial and Commercial Applications of Smart Structures Technologies; (2001) https://doi.org/10.1117/12.429667
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

Abstract

The power requirements imposed on the amplifier by piezoelectric actuators in both open and closed loop vibration suppression control systems is discussed. We consider a two-degree-of-freedom mechanical system driven by a piezoelectric stack for the purpose of analyzing power flow and power dissipation. A state space model for this system that includes the electrical input and output variables of the piezoelectric actuator is developed. The power requirements of the open loop system are measured and compared to simulations performed with the state-space model. Results show that the simulations correlate well with the measured data. We then investigate the power requirements for two closed-loop vibration suppression control schemes. We show that the closed-loop power flow and power dissipation is a function of the type of feedback control law implemented. In our simulations, a feedback controller that introduces significant damping (approximately 70% critical) increases the frequency range in which real power is flowing between the actuator and the mechanical system. A controller that introduces only light damping is primarily reactive over the frequency range studied but exhibits a narrowband region of real power flow. Linear amplifier analysis demonstrates that the closed-loop control system must be considered in determining the power dissipation requirements for the control system.

Citation Download Citation

Douglas K. Lindner, Nikola Vujic, and Donald J. Leo "Comparison of drive amplifier for piezoelectric actuators", Proc. SPIE 4332, Smart Structures and Materials 2001: Industrial and Commercial Applications of Smart Structures Technologies, (14 June 2001); https://doi.org/10.1117/12.429667

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