端面波对液体静压止推轴承静态特性的影响

Effect on Performances of Hydrostatic Thrust Bearing Influenced by End Plane Wave

由于加工误差的存在,轴承端面不可避免存在轴向跳动。为研究轴向跳动周期、幅值和相位对静压止推轴承性能的影响,仅考虑占主导地位的基频谐波跳动,将其纳入封油面间隙变化方程,通过构建止推轴承端面模型,模拟封油面间隙变化情况;采用有限差分法求解极坐标系下的雷诺方程,获得封油面上的压力分布,分析讨论了端面基波的周期、幅值和相位对静压止推轴承静态特性的影响。结果表明,当轴承结构参数不变时,随着转速提高,流量、承载力和动压比均随之增加,而静压腔压力则减小。相同转速时,随周期增大,流量减小,静压腔压力和承载力增加,动压比先增大后减小;随幅值增大,流量和动压比增大,静压腔压力和承载力减小;随相位增加,流量先增大后减小再增大,静压腔压力先减小后增大再减小,承载力和动压比先减小后增大。

Due to the presence of machining errors,the axial runout exists inevitably in the end plane of the bearing.In order to study the effect of the cycle,amplitude and phase of axial runout on the performance of the hydrostatic thrust bearing,by only considering the dominant fundamental frequency harmonic beating and introducing it into the gap change equation of the bearing sealing surface,the model of the thrust bearing end plane was constructed,the variation of oil film thickness was simulated in the sealing surface. The Reynolds equation in the polar coordinate system was solved by the finite difference method,the pressure distribution on the bearing sealing surface was obtained,and the influence of the cycle,amplitude and phase of the fundamental wave on the static characteristics of the thrust hydrostatic bearing was analyzed. The results show that,when the structural parameters remain constant,with the increasing of the rotational speed,the flow rate,the bearing capacity and the dynamic pressure ratio are increased,while the pressure of the hydrostatic chamber is decreased.At the same rotational speed,with the increasing of the cycle,the flow rate is decreased,the pressure of the hydrostatic chamber and the bearing capacity are increased,and the dynamic pressure ratio is firstly increased and then decreased; with the increasing of the amplitudes,the flow rate and the dynamic pressure ratio are increased,the pressure of the hydrostatic chamber and the bearing capacity are decreased; with the increasing of the phase,the flow rate is decreased after the first increase and then increased,the pressure of the hydrostatic chamber is increased after the first reduce and then decreased,the bearing capacity and dynamic pressure ratio are decreased after the increase.