基于牛顿迭代法的波箔型止推轴承不对中特性分析

Analysis of Misalignment Characteristics of Foil Thrust Bearing Based on Newton Iteration Method

为研究波箔型气体轴承运行过程中偏角不对中对轴承性能的影响,选择波箔气体止推轴承作为研究对象,从Reynolds控制方程出发,研究偏角不对中情况下,轴承各个部分的气膜厚度分布情况;结合边界条件,运用牛顿迭代算法计算得到气膜压力分布,进一步分析不对中对波箔止推轴承的承载能力和摩擦力矩的影响。研究结果表明:偏角不对中对于波箔止推轴承的性能有较大影响;随着偏角的增大,最大气膜压力增加,轴承的压力分布越来越不均匀,轴承摩擦力矩增大,系统稳定性大幅降低,但承载能力有一定增强;当偏角过大时,不能得到收敛的结果,轴承几乎失效,对比正常运行的波箔型止推轴承,性能大幅下降;扇形箔数量的增加会导致轴承的承载能力与稳定性均减小。

To study the influence of the misalignment of foil gas bearing on the performance of bearing during operation,the foil gas thrust bearing was selected as the research object.Starting from the Reynolds equation,the distribution of film thickness in each part of the bearing was studied under the angular misalignment.Combined with the boundary conditions,the Newton iterative algorithm was used to obtain the film pressure.The influence of misalignment on bearing capacity and friction moment of foil thrust bearing was analyzed.The results show that the angular misalignment has a great influence on the performance of the foil thrust bearing.With the increase of the deflection,the maximum gas film pressure is increased and the pressure distribution of the bearing becomes more and more uneven,the friction torque of the bearing is increased and the system stability of the bearing is greatly reduced,while the bearing capacity is enhanced.When the misalignment angle is too large,the convergence result cannot be obtained and the bearing is almost ineffective,and compared with the normal operation of the foil thrust bearing,the performance is greatly reduced.The increase of the number of fan-shaped foils will reduce the bearing capacity and stability.