ファン翼振動応答に対する各翼固有振動数と減衰のばらつきの影響 : 回転次数比共振解析

概要

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This paper reports influence of differences in natural frequencies and damping of axial fan on resonant amplitudes of engine orders. The analytical results can deduce several following new characteristics of blade vibration. (1) Each blades can not vibrate by itself, but influence each other through a hub element. The stiffness of hub does not make much difference in the coupled vibration effect. (2) The maximum amplitudes of engine order resonances are influenced more sensitively by differences of blade natural frequencies than by those of damping. (3) The distribution of differences in blade natural frequency does not change significantly the maximum amplitude at engine order resonance. (4) The maximum amplitude ratio can not be over about 1.5 in comparison with the case of uniform blades, even if considering any difference of natural frequencies.
社団法人日本機械学会の論文
1984-10-25