Abstract
A multi-stable nonlinear energy sink (MNES) with piecewise linear stiffness and magnet negative stiffness is developed to suppress the vibration of unbalanced rotor system. The specific structure of the MNES is developed, and the working principles of the piecewise linear stiffness and negative stiffness are introduced. Then, the dynamic equations of the rotor-MNES system are established. Based on these, the transient and steady state responses of the rotor-MNES system are numerically studied. In addition, the vibration suppression ability of the MNES is analysed and compared with that of bi-stable nonlinear energy sink (BNES). Finally, experiments are carried out to verify the effectiveness of the MNES. The numerical and experimental results show that the designed MNES has a strong vibration suppress ability and can withstand a wide range of energy.
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