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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Rotor Damped Natural Frequencies and Stability Under Reduced Oil Supply Flow Rates to Tilting-Pad Journal Bearings
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Rotor Damped Natural Frequencies and Stability Under Reduced Oil Supply Flow Rates to Tilting-Pad Journal Bearings

机译：在倾斜垫轴颈轴承的供油流量降低的情况下转子阻尼的固有频率和稳定性

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Reduced oil supply flow rates in fluid film bearings can cause cavitation, or lack of a fully developed film layer, over one or more of the pads due to starvation. Reduced oil flow has the well-documented effects of higher bearing operating temperatures and decreased power losses; however, little experimental data are available on its effects on system stability and dynamic performance. The study looks at the effects of oil supply flow rate on dynamic bearing performance by comparing experimentally identified damped natural frequencies and damping ratios to predictive models. A test rig consisting of a flexible rotor and supported by two tilting pad bearings in flooded housings is utilized in this study. Tests are conducted over a range of supercritical operating speeds and bearing loads while systematically reducing the oil supply flow rates provided to the bearings. Shaft response measured as a magnetic actuator is used to perform sine sweep excitations of the rotor. A single-input, multiple-output system identification technique is then used to obtain frequency response functions (FRFs) and modal parameters. All experimental results are compared to predicted results obtained from hearing models based on thermo-elastohydrodynamic (TEHD) lubrication theory. Both flooded and starved model flow assumptions are considered and compared to the data. Differences in the predicted trends of the models and the experimental data across varying operating conditions are examined. Predicted pressure profiles and dynamic coefficients from the models are presented to help explain any differences in trends.
机译：流体膜轴承中供油流量的降低会导致由于饥饿而在一个或多个轴瓦上产生气穴现象，或缺乏完全显影的膜层。众所周知，减少油流量具有较高的轴承工作温度和降低的功率损耗的效果；但是，关于其对系统稳定性和动态性能的影响的实验数据很少。该研究通过将实验确定的阻尼固有频率和阻尼比与预测模型进行比较，研究供油流量对动态轴承性能的影响。在这项研究中，使用了一个试验台架，该试验台架由柔性转子组成，并由两个浸入式轴承座中的倾斜垫轴承支撑。在超临界运行速度和轴承负载的范围内进行测试，同时有系统地减少提供给轴承的供油流量。作为磁致动器测量的轴响应用于执行转子的正弦扫描激励。然后，使用单输入多输出系统识别技术来获取频率响应函数（FRF）和模态参数。将所有实验结果与根据热弹流体力学（TEHD）润滑理论从听力模型获得的预测结果进行比较。淹没和饥饿模型流量假设均被考虑并与数据进行比较。研究了模型在不同操作条件下的预测趋势和实验数据的差异。提供了模型中的预测压力曲线和动态系数，以帮助解释趋势中的任何差异。

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