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smart-actuators
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Optimization of Actuators Position of a Low Aspect Ratio Variable-camber Wing and Derivation of Its Aerodynamic
, M.Sc. Thesis Sharif University of Technology ; Dehghani Firouzabadi, Rouhollah (Supervisor) ; Haddadpour, Hassan (Supervisor)
Abstract
Morphing concepts can potentially improve the performance and fuel consumption of modern aircrafts. Smart materials can reduce the weight and complexity, and also are of the best choices to improve efficiency and reliability for realizing morphing wings. Developing of a simple model and optimization of smart piezocomposite actuators position of a thin wing with variable camber is considered. The goal is to gain desired properties in incompressible subsonic regime. Lifting surfaces of a composite wing are simplified using shell model. Keeping the problem simple, a piezocomposite patch is used to change the shell curvature. Basic modes are extracted from FEM software and behavior of bimorph...
Experimental comparison of some phenomenological hysteresis models in characterizing hysteresis behavior of shape memory alloy actuators
, Article Journal of Intelligent Material Systems and Structures ; Volume 23, Issue 12 , 2012 , Pages 1287-1309 ; 1045389X (ISSN) ; Sayyaadi, H ; Sharif University of Technology
SAGE
2012
Abstract
Among the phenomenological hysteresis models, the Preisach model, Krasnosel'skii-Pokrovskii model, and Prandtl-Ishlinskii model have found extensive applications for modeling hysteresis in shape memory alloys and other smart actuators. Since the mathematical complexity of the identification and inversion problem depends directly on the type of phenomenological hysteresis modeling method, choosing a proper phenomenological model among the mentioned models for modeling the hysteretic behavior of shape memory alloy actuators is a task of crucial importance. Moreover, the accuracy of the hysteresis modeling method in characterizing shape memory alloy hysteretic behavior consequently affects the...