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Nonlinear dynamics of a SMA large-scale space structure

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Bibliographic Details
Main Author: Paula, Aline Souza de
Publication Date: 2012
Other Authors: Savi, Marcelo A., Lagoudas, Dimitris C.
Format: Article
Language: eng
Source: Repositório Institucional da UnB
Download full: http://repositorio.unb.br/handle/10482/28587
https://dx.doi.org/10.1590/S1678-58782012000500009
Summary: Large-scale structures are of special interest of aerospace applications, especially the ones involving smart materials. This paper deals with an archetypal system with two degrees of freedom that resembles the use of SMA elements as vibration isolation systems on a sparse aperture satellite array. The system has SMA elements in two perpendicular directions connected to a mass. Each SMA element is connected to a base structure. Imperfections are represented by establishing a comparison between two different systems: ideal and perturbed configuration system. The perturbed configuration is characterized by a situation where all SMA elements are in a stress-free state. The thermomechanical behavior of SMA elements is described by a constitutive model with internal constrains. Numerical tests of this system are of concern showing its general dynamical behavior. Periodic and chaotic motions are investigated showing the complex behaviors of this kind of system. The effect of imperfection in system dynamics is also discussed.

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