Vibration Control of Smart Structures Using an Adaptive Self-Sensing Piezoelectric Actuator

摘要

A self-sensing actuator is known to be effective in vibration control of flexible structures. Currently, a self-sensing piezoelectric actuator can be implemented by using a tuned bridge circuit. This circuit easily becomes unbalanced because of piezoelectric material which is sensitive to ambient temperature. If the bridge circuit is unbalanced, the closed-loop system becomes unstable. In this paper, a self-sensing actuator which has no bridge circuit is proposed. This proposed method estimates sensor signal with observer, and estimates piezoelectric capacitance. The results of numerical simulations illustrate that the proposed method estimates the piezoelectric capacitance correctly and stabilizes the closed-loop system adaptively.