Piezoelectric self sensing actuators for high voltage excitation

Abstract

Self sensing techniques allow the use of a piezoelectric transducer simultaneously as an actuator and as a sensor. Such techniques are based on knowledge of the transducer behaviour and on measurements of electrical quantities, in particular voltage and charge. Past research work has mainly considered the linear behaviour of piezoelectric transducers, consequently restricting the operating driving voltages to low values. In this work a new self sensing technique is proposed which is able to perform self sensing reconstruction both at low and at high driving voltages. This technique, in fact, makes use of a hysteretic model to describe the nonlinear piezoelectric capacitance necessary for self sensing reconstruction. The capacitance can be measured and identified at the antiresonances of a vibrating structure with a good approximation. After providing a mathematical background to deal with the main aspects of self sensing, this technique is compared theoretically and experimentally to a typical linear one by using an aluminum plate with one bonded self sensing transducer and a positive position feedback (PPF) controller to verify the performance in self sensing based vibration control.

Dynamic force/position modeling of a one-DOF smart piezoelectric micro-finger with sensorized end-effector

“…The action is repeated many times. The models of y B and F e given in (13) are compared to the experimental results in Figure 8. The experimental results fit to the model with errors less than 10%.…”

“…However, for many applications, it is important to integrate force measurement into a piezoelectric actuator in order to develop the complete model of the piezoelectric actuator, determine the contact, study the interaction between the actuator and the environment and control precisely the interaction. Most of the force sensing techniques used for the piezoelectric actuators are the self-sensing [13], force estimation using models [14] and vision based force sensors [15]. However, the integration of calibrated force sensors is of great interest for precise dynamic measurement for many applications.…”

“…Comparison between the displacement model of the end-effector tip B y B given in(13) and experimental results for many sine voltages with an amplitude of 100V and with different frequencies where no force is applied:(a) 10Hz, (b) 50Hz, (c) 100Hz and (d) 500Hz. Small errors (less than 10%) between the model and the experimental result exist on the displacement/voltage model due to the model of Bouc-Wen used where the dynamic hysteresis is estimated using the static hysteresis determined by the Bouc-Wen method, H s (U), and the transient part of the actuator, D(s) and the dynamic hysteresis is identified by H(U, s) = H s (U) · D(s) B. Force/Displacement Model of the Smart FingerAfter validating the displacement/voltage model of the smart finger, the electrodes of the piezoelectric actuator are short circuited and a force is applied first at tip A and second at tip B in order to test the force/displacement model of the smart finger.…”

Piezo/pyro/photo‐catalysis activities in Ba0.85Ca0.15(Ti0.9Zr0.1)1‐xFexO3 ceramics

“…These materials have a huge market in the area of ultrasonic motors, buzzers, and gas lighters etc. [1][2][3][4] Piezoelectric materials have been also explored for possible applications in energy harvesting. Energy harvested through piezoelectricity is relatively low and can only suitable for low power electronic devices.…”

Observer and Robust $H_{\infty }$ Control of a 2-DOF Piezoelectric Actuator Equipped With Self-Measurement

“…The observer was coupled with a robust H ∞ displacement feedback control to demonstrate the benefits of this approach. In [19]- [21], another observer has been proposed for the same actuator in order to estimate the force, the displacement and the state, all in low and high frequency regimes. These techniques were however used to estimate the displacement of 1-DOF actuator that exhibits displacement in one axis only.…”