This paper investigates nonlinear dynamic characteristics of a rotor system with aerodynamic journal bearings. The Finite Difference Method (FDM) is employed to solve the Reynolds equation, which is used to determine the nonlinear compressible gas force of the aerodynamic bearing. By applying the gas bearing force to system equations of motion, the system response can be determined by the numerical integration method. Results show that the aerodynamic bearing will provide higher loading capacity to support the rotor when the eccentricity ratio is increased. The aerodynamic bearing force increases when the rotor is speeding up or the squeeze frequency is raised. The rotor trajectory presents aperiodic behavior, and it becomes significant as the rotor mass increases. When the squeeze frequency decreases or the rotor mass increases, the radius of the rotor trajectory will increase. Recursive Least Square Method and Kalman Filter Method are used to identify the aerodynamic bearing parameters from the system response. The parameters include the damping and stiffness coefficients of the aerodynamic bearing. According to the results of identification, both identified parameters by these two methods are in good accordance. The results show that the aerodynamic bearing force can be precisely identified and the system response can be quickly solved by the identified system with less computer time. But the identified system lost its accuracy as the rotor speed or the squeeze frequency increase because these will enhance the nonlinearity of the aerodynamic bearing force.
Skip Nav Destination
ASME Turbo Expo 2007: Power for Land, Sea, and Air
May 14–17, 2007
Montreal, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4794-2
PROCEEDINGS PAPER
Nonlinear Dynamic Analysis of a Rotor System With Aerodynamic Journal Bearings Available to Purchase
T. N. Shiau,
T. N. Shiau
National Chung Cheng University, Chia-Yi, Taiwan
Search for other works by this author on:
W. C. Hsu,
W. C. Hsu
National WuFeng Institute of Technology, Chia-Yi, Taiwan
Search for other works by this author on:
B. W. Deng
B. W. Deng
National Chung Cheng University, Chia-Yi, Taiwan
Search for other works by this author on:
T. N. Shiau
National Chung Cheng University, Chia-Yi, Taiwan
W. C. Hsu
National WuFeng Institute of Technology, Chia-Yi, Taiwan
B. W. Deng
National Chung Cheng University, Chia-Yi, Taiwan
Paper No:
GT2007-27748, pp. 913-921; 9 pages
Published Online:
March 10, 2009
Citation
Shiau, TN, Hsu, WC, & Deng, BW. "Nonlinear Dynamic Analysis of a Rotor System With Aerodynamic Journal Bearings." Proceedings of the ASME Turbo Expo 2007: Power for Land, Sea, and Air. Volume 5: Turbo Expo 2007. Montreal, Canada. May 14–17, 2007. pp. 913-921. ASME. https://doi.org/10.1115/GT2007-27748
Download citation file:
11
Views
Related Proceedings Papers
Related Articles
Dynamic Analysis of a Motorized Spindle With Externally Pressurized Air Bearings
J. Vib. Acoust (August,2015)
An Interior Collocation Method for Static and Dynamic Analysis of Finite Length Gas Journal Bearings
J. Tribol (July,1988)
Stability of Multirecess Hybrid-Operating Oil Journal Bearings
J. Tribol (January,1985)
Related Chapters
Approximate Analysis of Plates
Design of Plate and Shell Structures
Summary and Conclusions
Bearing Dynamic Coefficients in Rotordynamics: Computation Methods and Practical Applications
Introduction
Introduction to Finite Element, Boundary Element, and Meshless Methods: With Applications to Heat Transfer and Fluid Flow