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Analysis of gas foil bearings integrating FE top foil models

机译：集成FE顶箔模型的气箔轴承分析

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摘要

Gas foil bearings (GFBs) find widespread usage in oil-free turbo expanders, APUs, and micro gas turbines for distributed power due to their low drag friction and ability to tolerate high-level vibrations. The performance of GFBs depends largely on the support elastic structure, i.e. a smooth foil on top of bump strips. Conventional models include only the bumps as equivalent stiffnesses uniformly distributed around the bearing circumference. More complex finite element (FE) models couple the elastic deformations of the 2D shell or 1D beam-like top foil to the bump deflections as well as to the gas film hydrodynamics. Predictions of journal attitude angle and minimum film thickness for increasing static loads and two journal speeds are obtained for a GFB tested decades ago. For the GFB studied, 2D FE model predictions overestimate the minimum film thickness at the bearing centerline, while underestimating it at the bearing edges. Predictions from the 1D FE model compare best to the limited tests data, reproducing closely the experimental circumferential wavy-like film thickness profile. Predicted stiffness and damping coefficients versus excitation frequency show that the two FE models result in slightly lower direct stiffness and damping coefficients than those from the simple elastic foundation model.
机译：气体箔轴承（GFB）因其低摩擦阻力和承受高水平振动的能力而广泛用于无油涡轮膨胀机，APU和微型燃气涡轮机中，以用于分布式动力。 GFB的性能在很大程度上取决于支撑弹性结构，即在凸块条顶部的平滑箔。常规模型仅包括凸起，因为等效刚度围绕轴承圆周均匀分布。更复杂的有限元（FE）模型将2D壳体或1D梁状顶部箔的弹性变形与凸点挠度以及气膜流体动力学耦合在一起。对于数十年前测试的GFB，可以得出轴颈姿态角和最小薄膜厚度（用于增加静态载荷和两个轴颈速度）的预测。对于所研究的GFB，二维有限元模型预测高估了轴承中心线的最小膜厚，而低估了轴承边缘的最小膜厚。一维有限元模型的预测结果与有限的测试数据进行了最佳比较，从而紧密再现了实验性的圆周波状薄膜厚度轮廓。预测的刚度和阻尼系数与激励频率的关系表明，与有限元模型相比，这两个有限元模型的直接刚度和阻尼系数略低。

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