せん断・モーメント型動吸振器によるはりの振動抑制

抄録

Dynamic absorbers are widely used for suppressing the vibrations of beam-like structures such as skyscrapers. These dynamic absorbers utilize the shearing force that exerts on structures (hereinafter refer to them as shear-type dynamic absorbers). In the previous paper, the authors proposed a moment-type dynamic absorber utilizing the bending moment that exerts on a beam (it is designated as a moment-type dynamic absorber). The effects of vibration suppression of the moment-type dynamic absorber attached to a cantilever and a simply supported beam were discussed theoretically and experimentally. In this paper, the authors consider another type of dynamic absorber utilizing both of shearing force and bending moment that exert on a beam (it is designated as a shear-moment-type dynamic absorber). The frequency responses of a cantilever beam to which a shear-moment-type dynamic absorber are discussed theoretically and numerically. Trial shear-moment-type dynamic absorber was manufactured using a three-layered sandwich beam. The effects of vibration suppression of the dynamic absorber were measured using an electromagnetic vibration machine. The experimental results showed that the shear-moment-type dynamic absorber is more effective than the shear-type and moment-type dynamic absorbers for suppressing the vibration of the beams. The experimental results were compared with the calculated results.