A Specific Methodology of Creep Compensation for piezoelectric Actuators by Open-loop control

Xuan Wang (1) , Valérie Pommier-Budinger (2) , Yves Gourinat (1)

1 ICA - Institut Clément Ader
2 DMIA - Département de Mathématiques, Informatique, Automatique

Piezoelectric actuators exhibit creep behavior in open-loop operation, which may lead to unaffordable errors in high precision static positioning systems. An inversion-based compensation strategy by open-loop control is presented for reducing creep effect. The approach utilizes a nonlinear viscoelastic model to portray creep phenomenon, which consists of a linear spring, a nonlinear dashpot and a series of nonlinear Voigt elements. It is shown that for the presented creep model the step responses are very similar to the piezoelectric actuators. In order to compensate creep effect, a concept of voltage relaxation in piezoelectric actuators is proposed. And the voltage relaxation model tantamount to the inverse creep model is derived using a PID closed-loop control system. Experimental results prove that, by insertion of voltage relaxation model in open-loop operation, creep effect is attenuated markedly in piezoelectric actuators.

Mots clés: Creep; Relaxation; Piezoelectric actuator; Inverse model; Compensation; Open-loop control

Domaines: Mécanique des structures [physics.class-ph]

Xuan Wang, Valérie Pommier-Budinger, Yves Gourinat. A Specific Methodology of Creep Compensation for piezoelectric Actuators by Open-loop control. International Conference on Mechanical Engineering, Materials and Energy (ICMEME 2012), Oct 2012, Dalian, China. pp.141-145, ⟨10.4028/www.scientific.net/AMM.281.141⟩. ⟨hal-01851680⟩