Wave absorption control of lumped mass system using a dynamic absorber with variable stiffness property

Abstract

Seismic and wind excitations may cause severe vibration in structures such as highrise buildings and bridges. In this study, we propose a wave absorption control method for reducing vibrations in multi-degree-of-freedom systems using a magnetorheological elastomer-based dynamic absorber. The stiffness of the absorber is changeable according to the applied magnetic field strength. The value is tuned adaptively so that the mechanical impedance at the boundary meets an absorptive boundary requirement. Numerical investigation clarified relationship between the excitation frequency and absorber stiffness that could eliminate the wave reflection from the boundary and maintain no resonant state in the system.