To solve the problem of vortex-induced vibration of aerostatic bearings, the disc small hole throttled aerostatic pressure bearing is taken as the research object. Based on the principle of vortex excitation and the theory of oscillatory fluid mechanics, the dynamic characteristics and fluid induced vibration stability of gas films are examined. Analysis of the characteristics of three-dimensional cyclonic vorticity distribution is then conducted using the plane flow function. Finally, the influence of offset load on the micro-vibration characteristics of air bearings is explored by means of numerical simulation and experimental tests. The study reveals that the micro vibration of aerostatic bearings is essentially the coupling between the vortex and the wall caused by unstable flow in the film flow field. Specifically, it is determined by pressure pulsation and vorticity distribution. Load distribution on the bearing surface directly determines the pressure gradient and energy conversion trend in the direction of the film height. The change of gas supply pressure and film thickness directly affects energy loss and conversion form in the process of total energy input and flow in the gas film.
WANG Jiyao
,
LONG Wei
,
WU Mimi
,
ZHAO Na
,
BI Yuhua
. Experiment of load distribution on micro-vibration characteristics of aerostatic bearings[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020
, 41(8)
: 223679
-223679
.
DOI: 10.7527/S1000-6893.2020.23679
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