BEAM-TYPE DYNAMIC VIBRATION ABSORBER COMPRISED OF FREE-FREE BEAM. TECHNICAL NOTE

This note presents a new beam-type vibration absorber having a suppressing effect on several vibration modes of beams. An approximate tuning method of the beam-type dynamic absorber is proposed, in which application is made of the tuning conditions of an absorber in the two-degrees-of-freedom system. Numerical investigations have shown the approximate tuning method to be useful and have demonstrated the effectiveness of the beam-type dynamic vibration absorber. This new absorber will be used for the deck type of steel bridge without an intermediate sway bracing, which has a space under the deck whereby this beam-type dynamic absorber may be attached.