Permanent magnet based nonlinear energy sink for torsional vibration suppression of rotor systems

Abstract

A permanent magnet nonlinear energy sink (PMNES) featuring a combination of negative stiffness and positive stiffness is proposed to suppress the torsional vibrations of the rotor system. The specific structure and working principles of the PMNES are introduced. Then, the dynamic model of the rotor-PMNES system is established, and the vibration attenuation ability of the proposed PMNES is numerically studied. And then, the vibration reduction performance of the PMNES and linear dynamic vibration absorber (LDVA) is compared. Finally, experimental studies on the rotor system are carried out. The results show that the rotor system with the PMNES obtains 2.31 times dissipating speed than the rotor system without the PMNES in transient responses, and the suppression rate of PMNES on the rotor can reach 65.37% in steady-state responses.