Abstract
In order to research the conical spiral groove aerodynamic bearings, the lubrication mathematical model of the bearings was established. The Reynolds equation of the laminar flow condition is used to calculate the partial differential equation of the perturbation pressure with the local finite difference method. Through calculating the stiffness and damping coefficient, the influence of the speed of law and eccentricity ratio on the dynamic characteristic coefficients has been gained. The mathematical model for the stability of the bearing-rotor system is established to study the influence law of speed influence of the law of speed and eccentricity ratio on the stability. The results show that the influence of the bearing's speed and eccentricity on the dynamic characteristics is significant. A reasonable choice of the bearing's speed and eccentricity contributes to improve the dynamic characteristics and the stability of the bearing-rotor system.
Highlights
Aerodynamic bearing depends on the gas dynamic pressure film that has formed in the bearing clearance with a certain stiffness to support the rotor
The nonlinear dimensionless Reynolds equation of conical spiral groove aerodynamic bearings under the state of laminar flow is established in the transient state
The system stability in the low speed range is better than the stability in the high speed range
Summary
Aerodynamic bearing depends on the gas dynamic pressure film that has formed in the bearing clearance with a certain stiffness to support the rotor. The advantages are that it does not require external air feeder, with low friction, high speed and long service life, etc. The major disadvantages are low load capacity, small stiffness and poor stability. Due to the high rotation speed of the bearing that can reaches up to hundreds of thousands of revolutions per minute, the gas film pressure changes is a very complicated nonlinear stochastic process [3,4]. The behavior of the rotor and the stability of the bearing-rotor system are affected directly by the bearing's dynamic characteristics [5,6]. It is necessary to research the bearing's dynamic characteristics in-depth, and to analyze the stability of the bearing-rotor system
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
