Beneficial performance of a quasi-zero-stiffness vibration isolator with displacement-velocity feedback control

A displacement-velocity feedback control method is proposed to enhance the isolation performance of a quasi-zero-stiffness vibration isolator (QZS-VI). Time delay considered in controlled QZS-VI system. First, steady-state solutions are obtained using averaging and validated by numerical method. The jump phenomenon frequency island can occur, stability analysis implemented. Then, effects time gain on response analyzed detail. force transmissibility defined evaluate results show that mainly affects system weakly influences performance. effectively suppress resonant region without affecting region. Finally, effect illustrated concept an equivalent damping ratio.