High Speed Gas Bearing System with Actively Controlled Clearance

具有主动控制间隙的高速气体轴承系统

• 批准号: 09555056
• 负责人: HASHIMOTO Hiromu
• 金额: $ 5.57万
• 依托单位: Tokai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555056/
• 关键词: Machine Element; Tribology; Gas Film Bearing; Step Bearing; Optimization; High-Speed; Vibration; Active Control; 気体軸受; ステップスラスト軸受; 高速回転軸; 浮上特性; 減衰特性; アクチュエータ; 最適設計

Gas film bearings are used for supporting high-speed rotating machinery such as gas expander, turbo-pomp, high-speed motor and so on. Especially, stepped gas bearings are widely used for such machinery because of their simple structure, high load carrying capacity and high stability. However, conventional type of stepped gas film bearing has disadvantage of low damping capacity for sudden changes of applied load, for example, impulsive load.The aim of this research is to develop a new type of hydrodynamic stepped thrust gas film bearings by use of the piezo-type actuators to control actively the step height. The experimental apparatus was designed, in which the range of rotational speed is from 10000rpm to 40000rpm and the shaft is rotated with built-in-type high speed motor. The number of pads is six, the pad extent angle is 58deg., the outer diameter of pad is 32mm, the applied loads are 1.5kg to 2.0kg, respectively. These variables were determined by the hydrodynamic lubrication theory including the inertia effects at the step. Using such type of apparatus, the spring and damping capacity of gas film can be controlled actively with varying the step height.On the other hand, the static and dynamic characteristics of stepped thrust gas bearings are theoretically examined for a wide range of operating conditions. From the numerical results, the combined effects of fluid. film inertia at the step and compressibility of gas film on the bearing characteristics were clarified.

气膜轴承用于支撑高速旋转机械，如气体膨胀机、涡轮泵、高速电机等。特别是阶梯式气体轴承，由于其结构简单，承载能力高，稳定性高，被广泛应用于此类机械。然而，传统的阶梯式气膜轴承对于外加载荷（如脉冲载荷）的突然变化阻尼能力较低。本研究的目的是利用压电式作动器主动控制阶跃高度，开发一种新型的液力阶跃推力气膜轴承。设计了实验装置，其中转速范围为10000rpm ~ 40000rpm，轴由内置式高速电机旋转。垫片数量为6个，垫片延伸角为58度。，衬垫外径为32mm，所受载荷分别为1.5kg ~ 2.0kg。这些变量是由流体动力润滑理论确定的，包括台阶上的惯性效应。利用该装置，可以随台阶高度的变化而主动控制气膜的弹簧和阻尼能力。另一方面，在广泛的工作条件下，从理论上研究了阶梯推力气体轴承的静态和动态特性。从数值结果来看，流体的综合效应。阐明了步进气膜惯性和气膜可压缩性对轴承特性的影响。

项目成果

落合成行・橋本巨: "高速ステップスラスト気体軸受の静・動特性" 日本機械学会論文集(C). 63巻613. 3249-3256 (1997)

Yukio Ochisei/Gyo Hashimoto：“高速步进推力气体轴承的静态和动态特性”日本机械工程师学会学报 (C)，第 63 卷，613。3249-3256 (1997)。

Ochiai, M.and Hashimoto, H.: "Vibration Analysis of High Speed Stepped Thrust Gas Film Bearings with Inertia Effects" Proc.of 1997 ASME Design Engineering Conf.1-8 (1997)

Ochiai, M. 和 Hashimoto, H.：“具有惯性效应的高速步进推力气膜轴承的振动分析”Proc.of 1997 ASME Design Engineering Conf.1-8 (1997)

M.Ochiai & H.Hashimoto: "Vibration Analysis of High Speed Stepped Thrust Gas Film Bearings with Tnertia Effects" Proceedings of 1997 ASME Design Engineering Conf. VIB4047. 1-8 (1997)

落合先生