ESTUDO DO DESALINHAMENTO EM MÁQUINAS ROTATIVAS VIA MÉTODOS DE ELEMENTOS FINITOS

Abstract

Misalignment between shafts is a problem commonly found in rotating machines, and it is one of the main reasons for generating excessive stresses and causing mechanical components to fail. Therefore, this work aims to carry out a study of this theme through the finite element method, performing the analysis of stress and deformation, in addition to analyzing the fatigue life of the elements that make up the set under study. In this work, ANSYS software was used, and a geometric model composed of two axes directly coupled and supported by bearings was created. The boundary conditions were added so that the model has operating characteristics consistent with the reality of rotating machines. Then, the two examples of misalignment under study, parallel and angular, were simulated, this being added to rotation in components so that the resultant has an inclination angle and that one added a parallel displacement. The results obtained demonstrate that the two types of misalignment have different behavior. In parallel misalignment, stresses and strains grow linearly as the level of misalignment is increased, on the other hand, in angular misalignment there is no longer this linear growth, the increase is significantly greater both when increasing the misalignment and rotation. At the end, fatigue life analysis is performed in both examples and the result was a decrease in the number of cycles of the components under analysis.