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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:机械工程学报

Affiliation of Author(s):电子信息与电气工程学部

Issue:7

Page Number:80-83

ISSN No.:0577-6686

Abstract:Piezoelectric actuators often work in a close-loop feedback position control system due to their hysteresis linearity. The objective is to make an actuator self-sense its output force and displacement without using extra sensors. The technique is termed self-sensing actuator/actuation (SSA). A compound circuit is proposed to voltage-drive the piezoelectric actuator and get the resulting charge concurrently. Based on the circuit, the unstressed actuator can self-sense its free strain. If the actuator is externally stressed, an observer is constructed to estimate the actuator's stress and strain state. The observer-based self-sensing approach depends on the fact that the electric field is controllable and the electric displacement is measurable. In order to compensate hysteresis, the voltage versus charge relation is modeled by using the generalized Maxwell slip (GMS) model, and the observer is improved to a nonlinear one. The observer-based SSA approach successfully bypasses the impedance mismatching problem bothering the bridge-based SSA approach. The self-sensed average strain of piezoelectric bimorph is coincident with the tip displacement measured by the proximitor.

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