Design and Evaluation of Integral Damping Bearing for Vibration Suppression in Multi-Disk Rotor Systems

In response to vibration problems caused by unbalanced faults in multi-disk rotor systems of compressors, this research study proposes a new type of integral damping bearing (IDB) with an integral structure and better damping performance. The IDB's stiffness and damping coefficients were acquired through computational fluid dynamics (CFD) analysis. When the IDB was applied to a multi-disk rotor system, the analysis results show that it effectively lowered the bending stress and strain energy of the shaft and enhanced the stability of the system. The bending stress was reduced from 45 MPa (with traditional ball bearings) to 8.63 MPa (with the IDB). By using the IDB, the strain energy borne by the shaft and bearing was only 10.44%. Subsequently, experimental research was conducted on the suppression of unbalanced vibration by using the IDB under various working conditions. The peak amplitude of the rotor system with the IDB was reduced by 19.94%, and the amplitude at the 1X frequency was reduced by 32.73% compared with ball bearings. The experimental results indicate that the IDB can efficiently dampen the vibration of the rotor system. And it was found that the IDB has stable vibration reduction performance under various working conditions.