Experimental study on effect of rounded structure of air-floating bearing in pressure cavity on vibration characteristics

WU Jing1, QIAN Jun-bing2, YUAN Rui-bo1
(1.Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology,
Kunming 650500, China; 2.Faculty of Civil Aviation and Aeronautics, Kunming University
of Science and Technology, Kunming 650500, China)

Abstract: Aiming at the problem of the influence of different cavities on the microvibration characteristics of air bearing, two types of air floating bearings which can effectively reduce the vibration intensity were proposed, such as a rounded connection structure at the orifice outlet and a rounded connection structure at the outlet of the pressure equalizing cavity. A microvibration test experimental platform was set up, and then an experiment was carried out for the air bearing without fillet connection in the cavity and the rounded connection at the outlet of the orifice and the fillet connection at the outlet of the cavity. The microvibration signals of three different structures under different air supply pressures were collected and analyzed by the platform. The results indicate that the microvibration strength of the bearing increases with the increase of the air supply pressure. The rounded structure in the equalizing cavity has a greater influence on the vibration amplitude than on the resonance frequency. Under the highly air supply pressure, the rounded structures in cavity can effectively reduce the bearing microvibration. And the effect of reducing the vibration strength of the fillet connection structure at the outlet of the orifice is better.
Key words: air bearing; pressure cavity; rounded structure; vibration stability; frequency response