Theory and Experiment on a Method for On-Site Identification of Configurations of Multi-Bearing Rotor Systems

✍ Scribed by J.M. Krodkiewski; J. Ding

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 370 KB
• Volume: 164
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1993.1214

✦ Synopsis

A general approach has been developed for on-site identification of the actual configuration (alignment) of multi-bearing rotor systems (e.g., a turbogenerator unit). The identifcation procedure is based on the monitored trajectories of the relative motion of the journals with respect to the bearings and a non-linear mathematical model of the system considered. The mathematical model includes the dynamic properties of rotors, their foundations and supporting structures as well as the non-linear properties of the oil bearings. Time integration of the non-linear equations of motion along the measured trajectories yields the desired configuration parameters (relative transverse positions of the bearing centres). The derived procedure of identification was verified by means of a computer simulation as well as an experimental investigation on a four-bearing rotor test installation. The results may be used for the diagnosis of vibration problems in rotating machinery as well as the optimization of their vibration response.