Internal resonance phenomena of an asymmetrical rotating shaft: critical speed of twice the major critical speed

摘要

Unstable vibrations appear in the vicinities of several critical speeds in asymmetric rotor systems with nonlinear spring char-acteristics. However, when the natural frequencies satisfy internal resonance relation exactly or approximately, these phenomena may change remarkably. In this paper, such internal resonance phenomena of an asymmetric shaft-disk system are studied theoretically and experimentally. The changes in nonlinear phenomena during the transition from the system with internal resonance to the system with no internal resonance are also investigated.