Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
CAMPBELL DIAGRAM CALCULATION DIDATIC SOFTWARE USING FINITE ELEMENTS METHOD
Submission Author:
Aguinaldo Soares de Oliveira , MT
Co-Authors:
Aguinaldo Soares de Oliveira
Presenter: Thailler Machado Nunes da Silva
doi://10.26678/ABCM.COBEM2019.COB2019-0401
Abstract
The gyroscopic effect changes the natural frequencies of rotator machines, which induces the appearance of a pair of frequencies, called whirling frequencies. The highest whirling frequencies value of a pair presents a rotation in the same direction of the rotor and the other, the lowest one, rotates on the other direction. The occurrence of the highest or lowest frequencies depends on the rotation and on the initial condition. When the velocity of rotation has a whole multiple of the value of the whirling frequencies, there is an excessive vibration that may damages the machine. In the design of rotator machine, the operation closer to these points must be avoided. In this work, a software has been developed to determine the whirling frequencies using finite elements technique, considering the effects of the rotatory inertia and shaft-bending shear. It was used Laval rotor like didatic model for the rotor dynamics teaching, because it is a possible analytic solution to compared with numeric solution.
Keywords
Whirling Frequencies, Finite Elements, Didatic Software
