A New Type of Inerter Nonlinear Energy Sink Using Chiral Metamaterials

To reduce size and weight of the inertial mass required in traditional nonlinear energy sink (NES), a chiral metamaterials inerter nonlinear energy sink (CINES) for suppressing the torsional vibration of the rotor system is developed in this paper. The INES is a combination of a NES with piecewise linear stiffness and an inerter utilizing the compressive-torsional coupling effect of chiral metamaterials. The structure of the CINES is introduced, the inerter mechanism is analyzed and the dynamic model of the CINES-rotor system is built. Vibration attenuation performance of CINES on the rotor system is evaluated by the transient torsional vibration and steady-state torsional vibration. By using the inerter, a significant damping effect also appears.