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Internal Resonance Phenomena of an Asymmetrical Rotating Shaft

Department of Electronic-Mechanical Engineering, School of Engineering, Nagoya University, Nagoya, Aichi, 464-8603, Japan

Tsuyoshi Inoue

Department of Electronic-Mechanical Engineering, School of Engineering, Nagoya University, Nagoya, Aichi, 464-8603, Japan, inoue{at}nuem.nagoya-u.ac.jp

In general, asymmetrical shaft-disk systems have been investigated where unstable vibrations may occur. Most studies have treated a single resonance case for the linear system, and we have previously treated a single resonance case for the nonlinear system. However, when natural frequencies have a simple integer ratio relation in a nonlinear asymmetrical shaft-disk system, an internal resonance may occur and the vibration phenomena change remarkably compared to the characteristics of a single resonance case (the case without internal resonance). In this study, the internal resonance phenomena of an asymmetrical shaft are investigated theoretically and experimentally in the vicinities of the major critical speed, and twice and three times the major critical speed. We clarify that the shape of the resonance curves changes, almost periodic motions occur, and, especially, the occurrence of unstable vibration at the rotational speed of twice the major critical speed is extremely affected by the internal resonance. Further, we show the change of nonlinear phenomena between the systems with and without internal resonance.

Key Words: Internal resonance • asymmetrical rotating shaft • unstable vibration • almost periodic motion

Journal of Vibration and Control, Vol. 11, No. 9, 1173-1193 (2005)
DOI: 10.1177/1077546305055996


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