Single mass dual frequency fixed delayed resonator

摘要

Vibrations in a structure having a large mass and a multiplicity of frequencies of excitation are damped by determining two principal frequencies of excitation for the structure and coupling thereto a damping member of smaller mass to produce an absorber. The spring damper characteristics of the absorber are determined at these frequencies and the displacement of the damping member is monitored. The monitored displacement of the damping member is processed together with the spring damper characteristics of the absorber to output a signal which produces a force acting on the damping member proportional to the displacement of the damping member with a controlled time delay. This produces two frequencies of vibration in the damping member substantially equal to the determined frequencies of excitation of the large structure and thereby produces resonance of the damping member substantially at the determined frequencies of excitation. The resonance is effective to damp substantially the vibrations of the large structure at the determined frequencies of excitation.