A comparison of different approaches to detect the transitions from regular to chaotic motions in SMA oscillator

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Switching between periodic orbits in impact oscillator by time-delayed feedback methods

Acknowledgements The authors also acknowledge the financial support from Coordenação de Aperfeiçoamento do Pessoal de Nivel Superior (CAPES), under the Grant Number 88881.189487/2018-01 and FAPERJ.Peer reviewedPublisher PD

Chaos in Impact Oscillators not in Vain : Dynamics of New Mass Excited Oscillator

Open Access via the Springer Compact Agreement A part of this project was funded by Coordenação de Aperfeiçoamento do Pessoal de Nivel Superior (CAPES) under the grant number 88881.189487/2018-01.Peer reviewedPublisher PD

Nonlinear dynamics of a SMA large-scale space structure

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

Experimental bifurcation control of a parametric pendulum

Acknowledgments The authors would like to thank the Brazilian Research Agencies CNPq, CAPES and FAPERJ and through the INCT-EIE (National Institute of Science and Technology - Smart Structures in Engineering) the CNPq and FAPEMIG for their support. The Air Force Office of Scientific Research (AFOSR) is also acknowledged. Funding The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors would like to acknowledge the support of ANP, FINEP and MCT through PRH-PB/MCT, and also the support of Petrobras. The authors also would like to thank the Brazilian Research Agencies CNPq, CAPES and FAPERJ and through the INCT-EIE (National Institute of Science and Technology - Smart Structures in Engineering) the CNPq and FAPEMIG for their support. The Air Force Office of Scientific Research (AFOSR) is also acknowledged.Peer reviewedPostprin