Abstract

Over the past decades, experimental and theoretical studies on gas foil bearings have been conducted extensively. The essence of the operation of these bearings lies in the use of a unique underlying support mechanism, whose properties adapt to current operating conditions. The static and dynamic characteristics of the foil bearing structure depend not only on the geometry of the supporting structure but also on foil material, surface topology, the velocity of contact surfaces, load, etc. While the concept of stiffness is more intuitive and well described in the literature, the evaluation of the damping in foil bearings is not as obvious. The goal of this paper is to improve the understanding of the damping mechanism of the bump-type foil bearing structure under dynamic loads. At the beginning of the paper, the experimental studies of the foil bearing structure in a wide frequency range are discussed. Then, the experimental conditions were reproduced using an advanced numerical model that took into account the geometry of the top and bump foil, contact phenomena and dry friction. A new solution, unprecedented in the existing literature, is the inclusion of static and kinetic friction in the numerical model of the foil bearing structure. The developed numerical model made it possible to determine the system characteristics, including the evaluation of stiffness and damping. An important contribution of this work is the comparison of the results of calculations obtained with the use of an advanced numerical model with the results of experimental research. The paper gives clear guidelines for the experimental and numerical determination of dynamic characteristics for the bump-type foil bearing structure. The presented results of the experimental research can also be used to verify other numerical models.

Graphic abstract

中文翻译：

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考虑静态和动态干摩擦的箔轴承结构阻尼特性的实验和数值评估

摘要

在过去的几十年中，已经对气箔轴承进行了广泛的实验和理论研究。这些轴承的工作本质在于使用独特的底层支撑机构，其性能适应当前的运行条件。箔轴承结构的静态和动态特性不仅取决于支撑结构的几何形状，而且还取决于箔材料，表面拓扑，接触表面的速度，载荷等。而刚度的概念更直观并得到了很好的描述在文献中，箔轴承的阻尼评估并不那么明显。本文的目的是增进对动载荷作用下的凸块式箔片轴承结构的阻尼机理的理解。在本文的开头，讨论了箔轴承结构在较宽频率范围内的实验研究。然后，使用高级数值模型重现了实验条件，该模型考虑了顶部和凸点箔的几何形状，接触现象和干摩擦。在现有文献中前所未有的新解决方案是在箔轴承结构的数值模型中包括静摩擦和动摩擦。开发的数值模型可以确定系统特性，包括评估刚度和阻尼。这项工作的重要贡献是将使用高级数值模型获得的计算结果与实验研究的结果进行比较。本文为凸块式箔轴承结构的动力特性的实验和数值确定提供了明确的指导原则。实验研究的结果也可用于验证其他数值模型。

图形摘要