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Nonlinear Dynamic Responses of Rigid Rotor Supported by Thick Top Foil Bearings

LUBRICANTS(2023)

Beihang Univ | The Key Laboratory of Solar Thermal Energy and Photovoltaic System | Ningbo Hudu Energy Technol Co Ltd | Zhengzhou Aerotropolis Inst Artificial Intelligenc

Cited 0|Views25
Abstract
This study focuses on thick top foil bearings (TTFBs), which can prevent top foil from sagging and significantly reduce the load capacity of gas foil bearings (GFBs). However, the limited research on the dynamic responses of TTFB-rotor systems has hindered their wide application of TTFBs with high load capacity. To address this, an integrated nonlinear dynamic model is developed to analyze the linear dynamic responses of a rigid rotor supported on TTFBs. The model incorporates time domain orbit simulation, considering unsteady Reynolds equations, foil deformation equations, thick top foil motion equations, and rotor motion equations. A symmetrical test rig is used to validate the model, and three types of TTFBs with different bump foil stiffness are tested, with experimental results aligning with the model predictions. This study also investigates the effects of nominal clearance, static load, and unbalance on TTFB-rotor systems. The results indicate that unbalance has minimal impact on subsynchronous vibrations. However, larger bump foil stiffness, increased normal clearance, and higher static load contribute to improved stability and higher maximum stable speed of the TTFB-rotor system. Moreover, other relevant parameters reducing the bearing attitude angle can further enhance the system’s stability.
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nonlinear numerical prediction,thick top foil,subsynchronous vibrations,experimental investigation
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要点】:本文研究了厚顶箔轴承(TTFB)支持下的刚性转子非线性动态响应,提出了一种集成的非线性动态模型,并通过实验验证了模型的准确性。

方法】:采用时间域轨道模拟,将非定常雷诺方程、箔变形方程、厚顶箔运动方程以及转子运动方程整合到模型中。

实验】:使用对称测试台验证模型,测试了三种不同 bump 箔刚度的 TTFB,实验结果与模型预测一致,研究了名义间隙、静态负载和失衡对 TTFB-转子系统的影响。