As well as bearing instability and steam whirl a further cause of self-excitation is internal damping of the shaft material or due to micro-movement at shrink fits or couplings. The first was reported by Newkirk and Kimball in 1925 [14, 15, 16]. The mechanism is very complex but can be understood by the assumption of a viscous law. This will be considered in the next section.
KeywordsMode Shape Planet Gear Assembly Component Jeffcott Rotor Vibratory Velocity
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