静止非線形ばね特性をもつクラック軸の振動 : 調和振動と1/2次分数調波振動

概要

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In order to detect a crack due to fatigue, most of the previous researches on cracked rotors investigated vibrations which appear due to the piecewise linear spring characteristics of cracked rotors. They assumed that the restoring force of the elastic shaft is linear in the state with no crack. However, in rotating machinery, there are various causes which induce nonlinearity, such as clearance in bearings and oil films. As the nonlinearity induce similar kinds of resonances, the diagnoses proposed hitherto cannot be applied. In this paper, we investigate vibration characteristics of a rotor which has both static nonlinearity due to a mechanical element and rotating nonlinearity due to a crack. Especially, a harmonic resonance and a 1/2-order subharmonic resonance are investigated in detail by theoretical analyses and numerical simulations.
一般社団法人日本機械学会の論文
1999-04-25