... 29 12 2022 31 12 2022 16 03 2023 conical hybrid floating ring bearing thermodynamic lubrication temperature field dynamic coefficients stability performance National Natural Science Foundation of China 10.13039/501100001809 51575498 Bearing is a key part...

...Changmin Chen; Jianping Jing; Jiqing Cong; Zezeng Dai; Jianhua Cheng The position of fluid film in journal bearing will change while the journal moving in bearing, which can be named fluid film boundary migration (FFBM). It is usually ignored in the calculation of linear dynamic coefficients. While...

... axially partial helical grooves static and dynamic characteristics leakage flow rate dynamic fluid-film force dynamic coefficients whirl-frequency ratio effective damping coefficient Helically grooved seals have been proposed as a means of achieving greater reduction in the leakage flow rate...

... profiles that improve stability margins of rotor-bearing systems. The profile is defined by control points and cubic splines. Stability margins are estimated using bearing dynamic coefficients, and obtained solutions are analyzed as a function of the number of control points and of the Sommerfeld number...

... solving the unsteady compressible thin film fluid equations, we propose a method based on the use of frequency dependent dynamic coefficients and on the rational function approximation of the resulting impedances. Calculating impedances for several eccentricities enables mapping the full dynamic behavior...

... of the analytical method is that the complete set of dynamic coefficients of tilting-pad gas bearings can be obtained. The predictions show that the perturbation frequency has the strong effects on the dynamic coefficients of gas bearings. In general, at lower perturbation frequency, the equivalent direct stiffness...

...-acting tilting-pad gas bearing. The dynamic coefficients with the pads fixed and with the pads perturbation are, respectively, obtained for a typical self-acting tilting-pad gas bearing by using the proposed method to mainly explain the dependency of the bearing dynamic coefficients on the perturbation...

... by rotor-dynamic coefficients. 24 − { F X F Y } = [ K k − k K ] { X Y } + [ C c − c C ] { X ̇ Y ̇ } + [ M 0 0 M ] { X ̈ Y...

...Guang Qiao; Liping Wang; Tiesheng Zheng This paper describes a mathematical model to study the linear stability of a tilting-pad journal bearing system. By employing the Newton-Raphson method and the pad assembly technique, the full dynamic coefficients involving the shaft degrees of freedom...