FEM DYNAMIC ANALYSIS OF AN ONBOARD ROTOR
Marcelo Samora Sousa Jr1; Vergílio T. S. Del Claro1; Aldemir Aparecido Cavalini Jr1; Valder Steffen1
1 Universidade Federal de Uberlândia
Resumo
A FEM study regarding the dynamic behavior of rotating machines subject to base excitation and unbalance forces is hereby presented. The mathematical model of the rotor is based on the Timoshenko beam theory, which is obtained by considering the strain and kinetic energies of the shaft, discs, and mass unbalance. The resulting equations are used to provide information about the vibration responses of the rotor under base and unbalance excitations simultaneously. Some simplifications are adopted in order to obtain the responses of the considered rotor system, which is composed by a horizontal flexible shaft, two rigid discs, and two self-alignment ball bearings. Therefore, the proposed analysis is performed both in time and frequency domains, as illustrated by the orbits, unbalance response, and the Campbell diagram of the rotating machine. Finally, this study illustrates the main dynamic phenomena associated with onboard rotor systems.
Palavras-chave: onboard rotors,; FEM model; vibration responses