Modelling and Simulation of Aerodynamic Cylindrical Bearings Using ANSYS Hydrodynamic Bearing Element Types

IEEE Intelligent Vehicles Symposium. IEEE Intelligent Vehicles Symposium Pub Date : 2023-09-04 DOI:10.3390/vehicles5030061

Katrin Baumann, Hermann Freund

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Abstract

Modern power engine concepts and environmental restrictions demand oil-free lubrication of rotors, for example, by gas bearings. However, the stiffness and damping properties ruling the rotor’s dynamics are poorly documented for aerodynamic bearings and simple calculation methods are lacking. Based on the similarity between aerodynamic and hydrodynamic journal bearings, it is investigated to what extent the hydrodynamic bearing element types of the commercial FE program ANSYS are also suitable for air bearings. Within these elements, the compressibility of the gas is neglected. After verification of the ANSYS hydrodynamic element types with literature data for cylindrical hydrodynamic bearings, the stiffness and damping coefficients of a cylindrical aerodynamic bearing are calculated by using the ANSYS hydrodynamic element types. In the examined speed range, the results agree well with literature data that consider gas compressibility. Therefore, the FE elements designed for hydrodynamical journal bearings may also be used for simulating cylindrical aerodynamic bearings. The presented calculation approach provides a compact and easy-to-use method for rotordynamic simulations with cylindrical aerodynamic bearings in a single development environment.

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基于ANSYS的气动圆柱轴承流体动力元件类型建模与仿真

现代动力发动机概念和环境限制要求转子无油润滑，例如气体轴承。然而，刚度和阻尼特性的统治转子的动力学是很差的气动轴承文件和简单的计算方法是缺乏的。基于气动滑动轴承与流体动压滑动轴承的相似性，研究了商用有限元软件ANSYS的流体动压滑动轴承元件类型在多大程度上也适用于空气轴承。在这些元素中，忽略了气体的可压缩性。在对圆柱气动轴承的ANSYS流体动力单元类型与文献数据进行验证后，利用ANSYS流体动力单元类型计算圆柱气动轴承的刚度和阻尼系数。在测试的速度范围内，结果与考虑气体可压缩性的文献数据吻合得很好。因此，为流体滑动轴承设计的有限元单元也可以用于模拟圆柱气动轴承。所提出的计算方法为单一开发环境下圆柱气动轴承转子动力学仿真提供了一种简洁易用的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE Intelligent Vehicles Symposium. IEEE Intelligent Vehicles Symposium

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