Piezoelectric Actuators Characterization for Simultaneous Force and Displacement Self-Sensing by detecting Impedance

This paper introduces a new Self-Sensing Actuation approach for simultaneous estimation of external loads and Piezoelectric Actuator (PEA) displacement at a frequency where the PEA's impedance change presents good sensitivity to both electrical and mechanical excitations. Experiments are conducted for static operations to support these claims and to help demonstrate the dependence of the PEA's mechanical and electrical properties on external excitations: mechanical stresses with a low preload (less than the recommended 15 MPa for dynamic operations) and electric fields. (C) 2019, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.