非対称配置静翼を利用した翼・ディスク系の振動応答低減（ミスチューン系に対する振動応答低減効果の検討）

抄録

It is well known that asymmetric vane spacing can result in decreased levels of the excitation at specific frequencies. In this paper, the resonant response reduction of mistuned bladed disks due to asymmetric vane spacing is studied theoretically for the most probable asymmetric vane, in which the vane count of the upper and lower half is slightly different. First, a method for predicting the maximum amplitude of the mistuned bladed disk for the asymmetric vane spacing is proposed. Second, a parametric study is carried out using Monte Carlo simulation to clarify the vibration response characteristics of the mistuned bladed disk for the asymmetric vane spacing. From these results, it is concluded that for the mistuned bladed disk, the asymmetric vane spacing is effective to reduce the resonant response, and the maximum response of the mistuned bladed disk rotating through asymmetric vane spacing can be roughly estimated by the maximum response of the mistuned bladed disk to symmetric vane spacing multiplied by the response reduction effect for free-standing blade without the circumferential coupling, unless the multi-resonances happen to appear. On the other hand, if the multi-resonances occur, it is possible that the asymmetric vane spacing increases the resonant response level.