• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>World Tribology Congress III 2005 vol.2 >ANALYSIS OF GAS FOIL BEARINGS WITH PIECEWISE LINEAR ELASTIC SUPPORTS
【24h】

ANALYSIS OF GAS FOIL BEARINGS WITH PIECEWISE LINEAR ELASTIC SUPPORTS

机译：分段线性弹性支撑的气膜轴承分析

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Gas foil bearings (GFBs) rely on their underlying elastic foundation to support radial loads at high rotor speeds. The bump foil strip compliance determines the maximum load capacity with large rotor excursions, well in excess of the bearing nominal clearance. GFBs must be designed properly to permit their reliable (predictable) usage in aircraft engines and other heavy load applications because an elastic foundation that is too soft results in a limited load capacity. Configurations in practical use include a second bump-strip layer or stop-pins underneath the original bumps which become active above a certain load threshold. In these last configurations, the overall stiffness of the support structure has piecewise load versus deflection characteristics. Presently, a simple physical model for GFBs with piecewise linear elastic supports follows. The analysis couples the Reynolds equation for the thin film flow of an ideal gas to the elastic supports motion. An exact flow advection model is adopted to solve the partial differential equations for the zeroth- and first- order pressure fields, thus rendering the GFB load capacity and frequency dependent rotordynamic force coefficients. Predictions show that heavily loaded GFBs comprising two bump layers in series and including stop pins prevent too large bump deflections which may induce permanent plastic deformations. The structural damping or loss factor in a GFB with a two bump strip layer enhances the bearing direct damping force coefficients.
机译：气箔轴承（GFB）依靠其下层的弹性基础来支撑转子高转速下的径向载荷。凹凸箔条的柔韧性决定了大转子偏移时的最大负载能力，远远超过了轴承的额定间隙。 GFB必须经过适当设计，以使其在飞机发动机和其他重负载应用中可靠（可预测）使用，因为太软的弹性基础会导致有限的负载能力。实际使用中的配置包括原始凸块下方的第二个凸点剥离层或限位销，这些凸点在高于某个负载阈值时才起作用。在这些最后的构造中，支撑结构的整体刚度具有分段载荷与挠曲特性。目前，具有分段线性弹性支撑的GFB的简单物理模型如下。该分析将理想气体的薄膜流的雷诺方程与弹性支撑运动耦合。采用精确的流动对流模型来求解零阶和一阶压力场的偏微分方程，从而得出GFB的负载能力和与频率相关的转子动力系数。预测表明，包括两个串联的凸块层并包括止动销的重载GFB可以防止过大的凸块挠曲，而这可能引起永久性塑性变形。具有两个凸块带层的GFB中的结构阻尼或损耗因数提高了轴承的直接阻尼力系数。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号