Prediction of Dynamic Coefficients of Bump-Type Foil Bearings with Bumps Considered as Link-Spring Structures
Prediction of Dynamic Coefficients of Bump-Type Foil Bearings with Bumps Considered as Link-Spring Structures
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DOI：
10.2474/trol.6.10
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发表时间：
2011-01
期刊：
影响因子：
1
通讯作者：
K. Feng;S. Kaneko
中科院分区：
文献类型：
--
作者：
K. Feng;S. Kaneko
在近30年的使用经验中，凸点箔片轴承表现出了优异的性能。由于柔性翼片结构的特殊性，其性能预测模型必须将柔性翼片结构的弹性变形与空气压力耦合。在流体动力润滑理论中，空气压力的求解已经得到了很好的解决，但由于波纹凸块结构的力学复杂性，目前还不能精确地求解箔片的变形。在前人的工作中，建立了一个理论模型--连杆-弹簧模型来预测箔带的结构特性。四个因素的影响，即，考虑了波箔的弹性、波之间的相互作用力、接触表面处的摩擦力以及顶部波箔中的局部偏转。本文基于连杆弹簧模型，采用摄动法确定凸点箔片轴承的动态特性。用不同的网格进行了计算。计算结果表明，该方法计算结果与网格无关.摩擦力和径向间隙的动态系数的影响也使用摄动法进行了评估。
Bump-type foil bearings have demonstrated excellent performance in service experiences in recent 30 years. Due to their special structures, the performance prediction models must couple the air pressure with the elastic deflection of the compliant foil structure. The solution of air pressure has been well settled in the hydrodynamic lubrication theory, while the deflection of foils now still cannot be accurately solved due to the mechanical complexity of the corrugated bump structure. A theoretical model, link-spring model, was developed to predict the structure characteristics of foil strips in a previous work. Effects of four factors, i.e., the elasticity of the bump foil, the interaction forces between bumps, the friction forces at contact surfaces, and the local deflection in the top foil, had been taken into consideration. In this investigation, based on the link-spring model, a perturbation approach is used to determine the dynamic characteristics of bump-type foil bearings. The calculations have been performed with different meshes. And the accordant results show that the calculation is independent on the mesh. The effects on the dynamic coefficients of the friction forces and radial clearance are also evaluated using the perturbation method.