Creep modeling and identification for piezoelectric actuators based on fractional-order system推荐.pdf

Mechatronics 23 (2013) 840–847 Contents lists available at SciVerse ScienceDirect Mechatronics journal homepage: /locate/mechatronics Creep modeling and identification for piezoelectric actuators based on fractional-order system Yanfang Liu a,b, Jinjun Shan b,⇑, Naiming Qi a a Department of Aerospace Engineering, Harbin Institute of Technology, Harbin 150001, China b Department of Earth and Space Science and Engineering, York University, Toronto, Ontario, Canada M3J 1P3 a r t i c l e i n f o a b s t r a c t Article history: This paper deals with creep modeling and identification for the piezoelectric actuator (PEA). Creep is an Available online 29 May 2013 essential phenomenon when a PEA operates over long periods of time. A fractional-order model is pro- posed by representing the PEA as resistocaptance, which is a novel approach. The simplified fractional- Keywords: order PEA model results in a double-logarithmic creep. Identification methods for PEA parameters are pre- Piezoelectric actuator sented. Experimental results validate the effectiveness of the proposed fractional-order creep model. Creep 2013 Elsevier Ltd. All rights reserved. Fractional-order Modeling Identification Nonlinearity 1. Introduction over shorter duration of time can help reduce the drifting caused