Abstract
This paper deals with abnormal vibrations encountered in experiments in the each case of in-plane blade system, out-of-plane blade system. In the case of the in-plane blade system, -1X resonance occurs caused by gravity. In the case of the out-of-plane blade system, two types of abnormal vibrations appear. One is -2X resonance at -2Ω=-ω_b due to unbalance of the shaft and anisotropy support. The other is a flow-induced self-exited vibration caused by galloping. Both occurred at the same time and both leads to the entrainment phenomenon. These abnormal vibrations are identified by our analysis technique. Our analysis technique can easily confirm that abnormal vibrations are resonance/self-excited vibration or forward/backward vibration.
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