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DINAME2019
DINAME2019
Numerical Investigation of a Jeffcott Rotor Undergoing Impact Against an SMA Coated Stator
Submission Author:
Alberto Paiva , RJ , Brazil
Co-Authors:
Alberto Paiva, Rodrigo Veronese Moreira, Alex Brandão
Presenter: Alberto Paiva
doi://10.26678/ABCM.DINAME2019.DIN2019-0174
Abstract
This work involves physical modeling and numerical simulation of a Jeffcott-based rotor-stator system with four degrees of freedom (two planar coordinates for each component), such that the stator inner surface is subjected to contact and is coated with a shape memory alloy layer, whose constitutive behavior is described by a first-order phase transition polynomial constitutive model. Moreover, the dynamical response strongly depends on this shape memory coating layer temperature, which affects its stiffness and directly influences the impact forces. In this work, this element temperature is subjected to two competing phenomena: heating deriving from friction during impact and cooling as a result of convection caused by the interaction with the surrounding environment. The preliminary results show the model sensitivity to the convective coefficient, indicating that a more complex behavior is associated to lower values of this parameter. In the full version, a careful investigation of the nonlinear behavior pattern will be presented considering usual dynamical analysis tools, such as Poincaré sections, bifurcation diagrams and Lyapunov exponents.
Keywords
Jeffcott rotor, Shape Memory Alloys, Falk Model, nonlinear dynamics, chaos
