Vibration Characteristics of a Rotor System with Coupling of Insufficient Interference Fit of Disc-Shaft and Pedestal Looseness

doi:10.3901/JME.2022.11.109

Abstract

Abstract: The rotor is easy to produce the interference fit failure between the disc and the shaft under alternating load, this interference fit failure will cause the skidding, slight loosening between the disc and the shaft etc, also easy to cause other twin faults. In order to reveal the vibration characteristics of the rotor with coupling faults of insufficient interference fit and pedestal looseness, a finite element model of the rotor system with coupling faults of insufficient interference fit and pedestal looseness, is proposed. The simulation analyzes the influence of the loosening stiffness, loosening damping, rotating speed and interference range on the dynamic characteristics of the rotor system. A test bench for the rotor system with coupling of insufficient interference fit and pedestal looseness is built to verify the rationality of the simulation results. The results show that obvious beat vibration characteristics appear in the time domain vibration response of the rotor system with the loose disk. The beat vibration phenomenon becomes more and more obvious, and the beat period becomes larger with the increase of the rotating speed. Due to the insufficient interference force between the disc and the shaft, the rotating speed of the disk is not exactly the same as that of the shaft, and the difference of the disc speed to that of the shaft shows an increasing trend with the increase of the speed. The orbit of the disc centre gradually moves closer to the circle centre with the increase of the speed. With the increase of the amount insufficient interference, the orbit of the disc centre gradually moves closer to the circle centre and occurs an inner-8 shape.

Key words: interference failure, pedestal looseness, coupling faults, vibration characteristics, rotor system

CLC Number:

TH17
TH132

LI Zhinong, CHEN Shiyao, QIAO Fang, ZHOU Shijian, WANG Dong. Vibration Characteristics of a Rotor System with Coupling of Insufficient Interference Fit of Disc-Shaft and Pedestal Looseness[J]. Journal of Mechanical Engineering, 2022, 58(11): 109-119.

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