Nonlinear Oscillations of High-Speed Rotor Systems in Semi-Floating Ring Bearings

2015 ◽  
pp. 845-854 ◽  
Author(s):  
Aydin Boyaci ◽  
Bernhard Schweizer
Keyword(s):  
High Speed ◽  
Nonlinear Oscillations ◽  
Rotor Systems

scholarly journals Dynamics of High-Speed Precision Geared Rotor Systems

2014 ◽  
Vol 13 ◽  
pp. 03008
Author(s):  
Teik C. Lim
Keyword(s):  
High Speed ◽  
Rotor Systems

Methods and Algorithms for Calculating Nonlinear Oscillations of Rotor Systems

2021 ◽  
pp. 63-74
Author(s):  
Vitalii Simonovskiy ◽  
Ivan Pavlenko ◽  
Jan Pitel ◽  
Denys Stremoukhov ◽  
Vitalii Ivanov
Keyword(s):  
Nonlinear Oscillations ◽  
Rotor Systems

Suppression of Internal Damping-Induced Instability Using Adaptive Techniques

2007 ◽  
Author(s):  
Andra´s Simon ◽  
George Flowers
Keyword(s):  
Composite Materials ◽  
Simulation Modeling ◽  
High Speed ◽  
High Strength ◽  
Light Weight ◽  
Internal Damping ◽  
Modeling And Analysis ◽  
Rotor Systems ◽  
Rotor Spinning ◽  
High Speeds

Advanced rotor systems, for such applications as high-speed flywheel systems, consist (in a basic fashion) of a lightweight rotor spinning at relatively high speeds and supported by magnetic bearings. Composite materials are an extremely attractive choice for such rotor designs, offering high strength with light-weight. However, there are a number of issues that must be addressed for such efforts to be successful. Specific issues include imbalance control and active techniques to suppress internal damping-induced instability. A detailed description of the problem being considered and a strategy for solving it are presented. Simulation modeling and analysis results are presented and discussed to illustrate the method and demonstrate its effectiveness.

Efficient Techniques for the Computation of the Nonlinear Dynamics of a Foil-Air Bearing Rotor System

2013 ◽  
Author(s):  
Hai Pham ◽  
Philip Bonello
Keyword(s):  
Harmonic Balance ◽  
High Speed ◽  
Nonlinear Effects ◽  
Air Bearing ◽  
State Variables ◽  
Computational Burden ◽  
Rotor Systems ◽  
Symmetric Rotor ◽  
The Time Domain ◽  
Air Film

The foil-air bearing (FAB) plays a key role in the development of high speed, economical and environmentally friendly oil-free turbomachinery. However, FABs are known to be capable of introducing undesirable nonlinear effects into the dynamic response of a rotor-bearing system. This necessitates a means for calculating the nonlinear response of rotor systems with FABs. Up to now, the computational burden introduced by the interaction of the dynamics of the rotor, air film and foil structure has been overcome by uncoupling these three subsystems, introducing the potential for significant error. This paper performs the time domain solution of a simple rotordynamic system without uncoupling the state variables. This solution is then used as a reference for the verification of two proposed novel methods for reducing the computational burden: (a) use of harmonic balance; (b) use of Galerkin transformation. The applicability and accuracy of these two methods is illustrated on a simple symmetric rotor-FAB system.

Analysis of deceleration phenomenon of high speed rotor systems

1987 ◽  
Vol 1 (3) ◽  
pp. 293-299 ◽  
Author(s):  
B.S. Prabhu ◽  
R.B. Bhat ◽  
T.S. Sankar
Keyword(s):  
High Speed ◽  
Rotor Systems

scholarly journals A nonlinear model for rotor-shaft joints of high speed rotor systems with internal damping

PAMM ◽  
2008 ◽  
Vol 8 (1) ◽  
pp. 10371-10372
Author(s):  
Jonas Fischer ◽  
Jens Strackeljan
Keyword(s):  
Nonlinear Model ◽  
High Speed ◽  
Internal Damping ◽  
Rotor Systems ◽  
Rotor Shaft

scholarly journals Constrained Balancing of Two Industrial Rotor Systems: Least Squares and Min-Max Approaches

2009 ◽  
Vol 16 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Bin Huang ◽  
Daiki Fujimura ◽  
Paul Allaire ◽  
Zongli Lin ◽  
Guoxin Li
Keyword(s):  
Least Squares ◽  
High Speed ◽  
Least Squares Method ◽  
Weighted Least Squares ◽  
Rotor Systems ◽  
Weighted Least Squares Method ◽  
Mass Unbalance ◽  
Second Order Cone ◽  
Residual Response ◽  
Rotor Mass

Rotor vibrations caused by rotor mass unbalance distributions are a major source of maintenance problems in high-speed rotating machinery. Minimizing this vibration by balancing under practical constraints is quite important to industry. This paper considers balancing of two large industrial rotor systems by constrained least squares and min-max balancing methods. In current industrial practice, the weighted least squares method has been utilized to minimize rotor vibrations for many years. One of its disadvantages is that it cannot guarantee that the maximum value of vibration is below a specified value. To achieve better balancing performance, the min-max balancing method utilizing the Second Order Cone Programming (SOCP) with the maximum correction weight constraint, the maximum residual response constraint as well as the weight splitting constraint has been utilized for effective balancing. The min-max balancing method can guarantee a maximum residual vibration value below an optimum value and is shown by simulation to significantly outperform the weighted least squares method.

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