动压箔片轴承气膜厚度分布特点

摘要

建立了考虑平箔片下垂效应的动压箔片轴承气弹耦合模型，以Reynolds方程描述气膜压力，以Euler梁单元描述平箔，以简单弹簧单元描述波箔。采用有限差分法和Newton-Raphson迭代法求解气膜压力方程，采用有限元法计算箔片变形，利用气膜压力与气膜厚度相互迭代逼近气弹耦合的收敛解。结果表明，在气膜压力较大区域相邻两支承箔拱之间的平箔段会发生微小的下陷弯曲，并伴随有压力场的局部变化。%An aeroelastic coupling model for aerodynamic foil bearings considering sagging effect of top foil is devel-oped,in which gas film pressure is described with Reynolds equation.The top foil is described with Euler beam ele-ments,and the bump foil is described with easy spring elements.The gas film pressure equation is solved by using fi-nite difference method and Newton-Raphson iterative method.The foil deformation is calculated by using finite ele-ment method,and the convergent solution of aeroelastic coupling is approximated by iterating gas film pressure and gas film thickness .The results show that in the region of high gas film pressure,there is small sag in the flat segment be-tween the two adjacent bumps,while locally pressure field variation in this region.