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COBEM 2021
26th International Congress of Mechanical Engineering
Design optimization for base excitation problem of a cantilevered beam coupled with shunt circuit on fatigue analysis
Submission Author:
João Pedro Sena , MG
Co-Authors:
João Pedro Sena, Gutembergy Diniz, Antonio Marcos de Lima, Erivaldo Pereira Nunes, Marcelo Araújo Delgado Filho
Presenter: João Pedro Sena
doi://10.26678/ABCM.COBEM2021.COB2021-1632
Abstract
Mechanical structures, in various applications, may be subjected to operational or ambient vibration. The vibration generates stresses in the structure, accumulating through time and resulting in cracks or even structural failures. Vibration control studies date back to the last century and present a variety of alternatives in order to attenuate the vibration and therefore the accumulating stresses. A simple Euler-Bernoulli formulation was used to calculate the stress history and the Frequency Response Function of the tip displacement in a cantilever beam. Parameterization of the formulation to a single function was performed to enable the use of a Genetic Algorithm and the minimize the peak value, obtaining then the optimal resistance. This resistance was then used to obtain the stress history of the beam, to calculate the accumulated damage and to define the fatigue life in the given conditions. The results show the optimal resistance value as the configuration with the highest fatigue life.
Keywords
shunt circuits, Optimization, Dynamic Systems, cantilever-beam, fatigue
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