Monday, May 12

10:30 AM-12:10 PM
Gilbert Stuart Room

Modeling and Control Issues on Hysteretic Active Materials

Active materials used as actuators in engineering applications exhibit nonlinear hysteretic response. The control of deformations of active structures, especially under cyclic loading, is therefore a challenging problem. Currently, there are physically motivated constitutive models of active materials and empirical models based on identification procedures. The first group of models includes micromechanically based models, which are usually difficult to invert and implement in a real time control algorithm. The second group of models, even though it satisfies controllability criteria, includes ad-hoc physical assumptions and a large number of empirical constants. The aim of this minisymposium is to bring together experts working on each model to discuss common ground between the approaches.

Organizers: Dimitris C. Lagoudas and Andrew K. Kurdila
Texas A&M University

10:30-10:50 Identification and Approximation of Hysteretic Control Influence Operators Associated with a Class of Active Material Models
H.T. Banks, North Carolina State University
10:55-11:15 On the Correspondence Between Micromechanical Models for Shape Memory Alloys and the Preisach Model for Hysteresis
Dimitris C. Lagoudas, Organizer; and A. Bhattacharyya, Texas A&M University
11:20-11:40 Mathematical Analysis of Thermoelectric Cooling of SMA Actuators
Zhonghai Ding, University of Nevada, Las Vegas; and Dimitris C. Lagoudas, Organizer
11:45-12:05 Identification and Feedforward Control of Hysteresis in Active Materials via the Ivshin-Pence Constitutive Model
Andrew J. Kurdila, Organizer

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MMD, 5/1/97