Dynamical analysis of hollow-shaft dual-rotor system with circular cracks. Issue 3 (September 2021)

• Record Type: Journal Article
• Authors: Yongfeng, Yang; Jianjun, Wang; Yanlin, Wang; Chao, Fu; Qingyang, Zheng; Kuan, Lu
• Is Part Of: Journal of low frequency noise, vibration, and active control. Volume 40:Issue 3(2021)
• Page Start: 1227
• Page End: 1240
• Publication Date: 2021-09
• Subjects: Rotor -- hollow-shaft -- circular cracks -- critical speed -- super-harmonic; Vibration -- Periodicals; Noise -- Periodicals; Sound -- Periodicals; Damping (Mechanics) -- Periodicals; Damping (Mechanics); Noise; Sound; Vibration; Periodicals; 620.205
• DOI: 10.1177/1461348420948287
• Languages: English
• ISSNs: 1461-3484

Abstract

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.