Design, analysis and testing of an inerter-based passive sky-hook damper

The benefits of the sky-hook damper have been intentionally introduced to reduce the resonance peak while maintaining performance in the high-frequency band. However, few results have been reported on passive methods to realize the sky-hook damper effect. This paper proposes a novel inerter-based vibration isolation system exhibiting a passive sky-hook damper effect, ������.������., suppressing resonance while ensuring high-frequency attenuation performance without utilizing inertial velocity sensors. Firstly, the mechanism and the structure of the proposed inerter-based sky-hook damper (IPSD) are introduced. Then, the influences of parameters on the performance of the IPSD are studied, including the inertance, the rotational friction, and the magnet pitch. Finally, an IPSD prototype is designed, fabricated, and tested. The experiment results demonstrate that the IPSD can reduce 69% of the peak value of the transmissibility while maintaining a roll-off of -40 dB/Dec in the high-frequency band. This work presents a new approach to realize passive sky-hook damping in a compact way and provides guidelines for designing and analyzing the inerter-based vibration isolator.