| Citation: | XU Kefan, ZHANG Guanghui, HUANG Zhongwen, et al. Characteristics analysis of multi-leaf foil bearing with bump-foil support considering slip boundary[J]. Journal of Aerospace Power, 2023, 38（6）：1457-1466 doi: 10.13224/j.cnki.jasp.20210649
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To investigate the effect of slip boundary and bearing parameters on bearing characteristics, the Reynolds equation considering slip boundary was introduced to the multi-leaf foil bearing with bump-foil support. The Newton-Raphson iterative method and the perturbation method were successively employed to linearize the pressure governing equation, and the curved beam model was used to describe the radial foil deformation. The finite difference method was adopted to help establish the fluid-structure coupling solution model of this type of bearing, and the numerical results agreed well with the experimental results. The influences of bearing number, eccentricity ratio, length-diameter ratio, clearance ratio, the number and thickness of top foil on characteristic parameters were studied. The results indicated that slip boundary caused a general decrease of 3% in the load capacity of eight-leaf bearing when the bearing number and length-diameter ratio were small, meaning that the effect of slip boundary should be taken into consideration. Nevertheless, this effect was not sensitive to the change in the length-diameter ratio and thickness of the top foil. Besides, this type of bearing had a better stability. When the bearing number was small, the slip boundary led to the decline of bearing stability.
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