Análise de falhas no perfil de uma viga flexível, utilizando técnicas de vibrações e séries temporais

Abstract

This work is based on the analysis of the dynamic behavior of flexible beams in the presence of of cracks, the study was divided into two parts. The first consisted of implementing techniques for studying vibrations in a flexible beam fixed at one end subject to a crack in a variable position. The second stage consisted of analyzing the data collected using time series methods and techniques. For the beam simulation, the Euler-Bernoulli beam theory modeled using finite elements was used. From the model results, the beam displacements were analyzed according to the variation in the profile of its vibration in relation to the beam without crack. In particular, it was observed that the deviations in the vibration profile have a phase transition between two regimes: the first is a negative exponential and the second a steady state. It was also verified that the damping in the deviation amplitudes varies according to the position of the crack along the beam.