摘要
为解决平面静压气浮轴承受外界周期性扰动而振动的问题,将线性摄动法技术和流量连续性边界应用到频域内振动分析模型中,开展了气膜内压强对振动的响应分析。建立了气膜压强稳态、振动实部和振动虚部之间的耦合关系,提出了压强扰动项虚部和实部分离方法,在频域内轴承刚度和阻尼系数变化上对十字均压槽的作用进行了评价,进行了不同气膜厚度条件下轴承刚度和阻尼系数的数值模拟。研究结果表明:十字均压槽对频域内动态刚度和阻尼系数的影响受气膜厚度(h)影响,当6μm <h <7. 5μm时,十字均压槽既增大了轴承刚度,又提高了轴承稳定性;当9. 7μm <h <16μm时,尽管十字均压槽提高了轴承的刚度,但降低了轴承稳定性。
In order to solve the problems of the vibration of the plane external pressurized air bearings under the periodic disturbance condition,the linear perturbation method and the continue flux boundary were applied to the vibration analysis model in frequency domain. After the analysis of the vibration responses of the air pressure in the gas film,the coupling relationship of the air pressure among the stable part,the perturbation real part and the perturbation image part was established. A method was presented to separate the real part and the image part. The influences of the cross groove on dynamics perturbation response of the air bearings were evaluated on the changes of dynamics stiffness and the damping coefficient with the perturbation frequency,the dynamic performance of the air bearings were tested at the gas film depth( h) range of 6 μm to 20 μm. The results show that the influence of the cross groove in the frequency domain depended on the film depth,and only as 6 μm < h < 7. 5 μm,the cross groove enhances the stiffness and the damping coefficient simultaneously,and as 9. 7 μm<h <16μm,the cross groove enhances the stiffness,but weakens the stability.
作者
李陆军
LI Lu-jun(China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《机电工程》
CAS
北大核心
2019年第1期1-6,共6页
Journal of Mechanical & Electrical Engineering
基金
国家重点研发计划项目(2017YFC0405704)
关键词
平面静压气浮轴承
线性摄动法
动态刚度
阻尼系数
plane external-pressurized gas bearings
linear perturbation
dynamics stiffness
damping coefficient
