Identification of the vibration responses of a rub-impact rotor under uncertain excitations

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (18) : 122-127.

WANG Wei，GAN Chunbiao

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Abstract

A pseudo-periodic surrogate algorithm was introduced to analyze the vibration responses of a rub-impact rotor system under uncertain excitations, and the faulty signals were identified and classified.The dynamic model of the rub-impact rotor under the bounded noise excitation was established, where the nonlinear oil-film force and the rub-impact force were also taken into account.Then, the surrogate data of the responses of the system were generated via the pseudo-periodic surrogate algorithm, and the correlation dimensions of the original responses were compared with those of their corresponding artificial data.Meanwhile, the Poincaré cross-section portrait, the leading Lyapunov exponent and the bifurcation diagrams were employed to validate the predictions.The results show that, the pseudo-periodic surrogate algorithm can effectively identify the periodic-dominant and chaotic-dominant response signals, and can be further applied to the signal identification and fault diagnosis of rotor systems under uncertain excitations.

Key words

Jeffcott rotor / uncertain excitation / rub-impact / surrogate-data method / signal identification

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WANG Wei，GAN Chunbiao. Identification of the vibration responses of a rub-impact rotor under uncertain excitations[J]. Journal of Vibration and Shock, 2019, 38(18): 122-127

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