Publication

Abstract : Passive suppression of vortex-induced vibrations (VIV) of a circular cylinder is achieved via an inerter-enhanced nonlinear energy sink (NESI). The flow-induced force on the circular cylinder is modeled by using a van der Pol oscillator. The dynamic responses of the circular cylinder and the NESI are computed for different system parameters. The results indicate that the mass ratio between the cylinder and the NESI, the stiffness ratio between the cylinder and the NESI, and the NESI inertance to mass ratio between the cylinder effect significantly on the responses. The NESI parameter is optimized via a hybrid optimization algorithm. The response of the circular cylinder with NESI is compared with that of the cylinder with a conventional NES. It is found that the cylinder vibration amplitude is reduced by 82.86% with inerter-enhanced NES. The advantage of the NESI is also demonstrated by the time-frequency analysis. The voltage is generated by attaching piezoelectric element to the circular cylinder to power low-powered electronic devices.