Influence of crossgroove on dynamics perturbation response of plane externalpressurized gas bearings
                                                                                           LI Lujun
                                        (China Institute of Water Resources and Hydropower Research, Beijing 100038, China)

Abstract: In order to solve the problems of the vibration of the plane external pressurized air bearings under the periodic disturbance condition, the linear perturbation method and the continue flux boundary were applied to the vibration analysis model in frequency domain. After the analysis of the vibration responses of the air pressure in the gas film, the coupling relationship of the air pressure among the stable part, the perturbation real part and the perturbation image part was established. A method was presented to separate the real part and the image part. The influences of the cross groove on dynamics perturbation response of the air bearings were evaluated on the changes of dynamics stiffness and the damping coefficient with the perturbation frequency, the dynamic performance of the air bearings were tested at the gas film depth (h) range of 6 μm to 20 μm. The results show that the influence of the cross groove in the frequency domain depended on the film depth, and only as 6 μm<h<7.5 μm，the cross groove enhances the stiffness and the damping coefficient simultaneously, and as 9.7 μm<h<16 μm, the cross groove enhances the stiffness, but weakens the stability.

Key words: plane externalpressurized gas bearings; linear perturbation;dynamics stiffness; damping coefficient