Affiliations: College of Water Resource and Hydropower, Sichuan
University, Chengdu, Sichuan, China | School of Hydropower and Information Engineering,
Huazhong University of Science and Technology, Wuhan, Hubei, China | School of Energy and Environment, Xihua University,
Chengdu, Sichuan, China
Note: [] Corresponding author: Yong Xu, College of Water Resource and
Hydropower, Sichuan University, Chengdu 610065, Sichuan, China. E-mail: [email protected]
Abstract: A suitable dynamic model of rotor system is of great significance
not only for supplying knowledge of the fault mechanism, but also for assisting
in machine health monitoring research. Many techniques have been developed for
properly modeling the radial vibration of large hydro-turbine generator units.
However, an applicable dynamic model has not yet been reported in literature
due to the complexity of the boundary conditions and exciting forces. In this
paper, a finite element (FE) rotor dynamic model of radial vibration taking
account of operating conditions is proposed. A brief and practical database
method is employed to model the guide bearing. Taking advantage of the method,
rotating speed and bearing clearance can be considered in the model. A novel
algorithm, which can take account of both transient and steady-state analysis,
is proposed to solve the model. Dynamic response for rotor model of 125 MW
hydro-turbine generator units in Gezhouba Power Station is simulated. Field
data from Optimal Maintenance Information System for Hydro power plants (HOMIS)
are analyzed compared with the simulation. Results illustrate the application
value of the model in providing knowledge of the fault mechanism and in failure
diagnosis.
