A New Structural Stiffness Model for Bump-Type Foil Bearings: Application to Generation II Gas Lubricated Foil Thrust Bearing
A New Structural Stiffness Model for Bump-Type Foil Bearings: Application to Generation II Gas Lubricated Foil Thrust Bearing
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DOI：
10.1115/1.4027601
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发表时间：
2014-10
影响因子：
2.5
通讯作者：
A. M. Gad;S. Kaneko
中科院分区：
文献类型：
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作者：
A. M. Gad;S. Kaneko
本文第一部分介绍了一种新的箔片气体轴承柔顺结构的结构刚度模型。该模型研究了波箔带中凸块之间的平坦段可能横向偏转并从刚性支承表面分离的可能性，并且还考虑了波箔带中凸块之间的相互作用、波箔与周围结构之间的摩擦。通过与以往的数值和解析模型的直接比较，验证了解析解的有效性。在本文的第二部分中，我们利用所引进的波箔模型来研究第二代气体箔片止推轴承的静态特性。流固耦合的数值模拟结果表明，箔片止推轴承与刚性轴承具有许多共同的特性，箔片止推轴承的承载能力随转速的增加呈非线性增加，当转速超过一定值时，箔片止推轴承的承载能力将趋于渐近线。斜坡高度和界面摩擦的影响（即，在波箔/刚性轴承界面和波箔/顶箔界面处的摩擦）对第二代箔片推力轴承静态特性的影响。
A new structural stiffness model for the compliant structure in foil gas bearings is introduced in the first part of this work. The model investigates the possibility that the flat segment between bumps, in bump foil strip, may deflect laterally and separate from the rigid bearing surface, and it also considers the interaction between bumps in the bump foil strip, the friction between the bump foil, and the surrounding structure. The validity of the analytical solution was verified through direct comparison with previous numerical and analytical models. In the second part of this work, the introduced bump foil model is used to investigate the static characteristics of generation II gas foil thrust bearing. The numerical simulations of the coupled fluid-structure interactions revealed that the foil thrust bearings share many features with their rigid bearing counterpart and the results showed clearly that the load carrying capacity of foil thrust bearings increases nonlinearly with the rotation speed and is expected to reach an asymptote as the rotation speed exceeds a certain value. The effects of ramp height and interface friction (i.e., friction at bump foil/rigid bearing interface and bump foil/top foil interface) on the static characteristics of generation II foil thrust bearings are investigated.