Controle das vibrações de rotores flexíveis pela introdução de forças externas, através de técnicas de otimização

Abstract

This work presents an alternative open loop control method of flexible rotors vibration levei, through the introduction of externai forces to a rotating machine, straight along the rotors. Such forces, its number and distribution along the rotors, are selected observing the system modal information. The forces are defined by the following parameters: amplitude, frequency of excitation and angle of actuatíon and are determined through numerical optimization techniques, in a way which minimizes the system deformation energy. The rotor is modeled through the transfer matrix method where gyroscopic system eigenvalues are obtained through a polynomial method. The steady-state response of the system is calculated by a modal method. Numerical simulation shows a reductions up to 90% of the deformation energy of the shaft-bearings system, what indicates a significant reduction on the vibration levei.