Active Tuned Mass Damper: Sky-hook synthesis

Abstract

The association of a feedback control strategy with tuned mass dampers appears as an efficient way for enhancing the capability to damp structural vibration. Recently, several strategies have been proposed, which are targeting specific features, like multi-mode control, selective mode control. This study presents a new control law for hybrid vibration attenuation called hybrid SkyHook mass damper. Mechanical analogy and power flow formulation, shows that it enables the synthesis of an active skyhook damper, associated with an optimal passive Tuned Mass Damper. The improvement of performance is also accompanied by a failsafe behavior. The hyperstability property is theoretically ensured, which means that the stability of the controlled system is guaranteed. Performances are illustrated by experiments.. It shows that this hybrid device has remarkable properties in term of vibration attenuation on the whole frequency range as expected for SkyHook device. No response amplification or specific drawbacks are observed.