Dynamical analysis of hollow-shaft dual-rotor system with circular cracks

Yongfeng Yang, Jianjun Wang, Yanlin Wang, Chao Fu, Qingyang Zheng, Kuan Lu

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this paper, we considered a dual-rotor system with crack in shaft. The influence of circular crack in hollow shaft on dynamical response was studied. The equations of motion of 12 elements dual-rotor system model were derived. Harmonic balance method was employed to solve the equations. The critical speed and sub-critical speed responses were investigated. It was found that the circular crack in hollow shaft had greater influence on the first-backward critical speed than the first-forward critical speed. Owing to the influence of crack, the vibration peaks occurred at the 1/2, 1/3 and 1/4 critical speeds of the rotor system, along with a reduction in sub-critical speeds and critical speeds. The deeper crack away from the bearing affected the rotor more significantly. The whirling orbits, the time-domain responses and the spectra were obtained to show the super-harmonic resonance phenomenon in hollow-shaft cracked rotor system.

Original languageEnglish
Pages (from-to)1227-1240
Number of pages14
JournalJournal of Low Frequency Noise Vibration and Active Control
Issue number3
Early online date1 Sep 2020
Publication statusPublished - 1 Sep 2021
Externally publishedYes


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