Effect of high-frequency low-amplitude vibration on the performance of a class of semi-active base isolation systems with on–off damping

An alternative vibration isolator that incorporates on–off friction damper with fast excitation input at the base of the damper is proposed in this paper. Friction is modelled using the Coulombʹs friction model as well as the LuGre model. Analytical expressions are obtained for the effective damper performance under fast excitation, and the performance of the isolator is studied in light of the effective damping characteristics. Numerical simulation of equation of motion validates the analytical results.