A track nonlinear energy sink with restricted motion for rotor systems

Abstract

Aiming at the problem of vibration suppression performance of the traditional track nonlinear energy sink (TNES) is hindered by the energy threshold limitation, a track nonlinear energy sink with restricted motion (RM-TNES), which strategically staggers the dead-zone by incorporating permanent magnets, is proposed in this paper. Firstly, the structure and principles of the RM-TNES are introduced, and the effects of parameters are analyzed. Subsequently, the dynamic model for the rotor-RM-TNES system is developed, and the parameters of the RM-TNES are optimized using a genetic algorithm (GA). Furthermore, the vibration suppression effects of the RM-TNES and traditional TNES are compared and analyzed under steady-state and transient excitation. Finally, experimental studies are carried out on the coupled system. The results indicate that the vibration suppression performance of the traditional TNES is significantly limited at the dead-zone, yielding a vibration suppression rate of only 27.27% for the steady-state response. In contrast, the RM-TNES successfully suppresses vibrations, achieving vibration suppression rates of 77.08% in simulations and 64.04% in experiments under steady-state excitation.