抄録
An analysis is presented for the Frahm-type blade-vibration-absorber (BVA) when the second flapwise bending natural circular frequency (ω2) coincides with the three per revolution (3Ω). The rate of change in ω2 with increasing the mass of BVA is drastic for the smaller mass ratio, but becomes mild for the larger one. For the purpose of comparison, the effect of a simply fixed weight is also investigated. The effect of BVA is much larger than that of the fixed weight for a same mass ratio in the both devices, if the mass ratio is reasonably small and if the station does not coincides with modal shape nodes.
