• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Symposium on Stability Control of Rotating Machinery(ISCORMA-4); 20070827-31; Calgary(CA) >ANALYSIS AND DIAGNOSIS OF VIBRATION INDUCED UNEVEN COMMUTATOR WEAR ON A COMMUTER JET APU
【24h】

ANALYSIS AND DIAGNOSIS OF VIBRATION INDUCED UNEVEN COMMUTATOR WEAR ON A COMMUTER JET APU

机译：通勤喷气飞机APU振动引起的换向器磨损分析与诊断

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

Significantly uneven radial wear patterns on several commutator copper surfaces of 10 kW DC starter-generator units of Auxiliary Power Units (APU) of a specific commuter jet necessitated an intensive engineering investigation to cure this problem. In service, the circumferentially uneven radial wear typically progressed to a degree where the brushes could no longer track the commutator radial profile to maintain continuous rubbing electrical contact with the commutator, rendering the APU DC starter-generator inoperable. A commutator-brush dynamics-wear model and corresponding new computer code were developed to simulate commutator wear as a function of operating time, and several design and operating parameters for this APU. This new analysis code was used to simulate commutator time-dependent radial wear patterns around the commutator 360° arc of contact, specifically to study the influences of various parameters, including (a) initial as-manufactured commutator radial run-out and (b) imposed unit vibration. The results of these simulations strongly suggested that the root cause of the uneven commutator wear problem was excessive unit vibration imposed by the small 60,000 rpm gas turbine that connects to the APU's 12,000 rpm DC starter-generator through a planetary-gear 5:1 speed reducer. Subsequent vibration information from the turbine manufacturer confirmed this conclusion and the commutator wear problem thereby eliminated by curing the root cause of the turbine rotor vibration. The turbine manufacturer's fix was a change in material for the turbine rotor axial retaining bolt to eliminate a severe bolt material creep phenomenon that allowed the turbine rotor to become loose in operation. Implementation of this turbine fix in the fleet resulted in elimination of the commutator uneven wear problem. Clearly, it was thereby determined not to be a deficiency in the DC starter-generator manufacturer's product but a deficiency in bolt material of the turbine manufacturer's unit. This paper presents development and formulation of the commutator-brush dynamics-wear model analysis as well as simulation results that closely replicate wear measurements on excessively worn APU commutator units.
机译：特定通勤喷气机辅助动力装置（APU）的10 kW直流起动发电机组的若干换向器铜表面上的径向磨损模式明显不均匀，因此需要进行深入的工程研究以解决此问题。在使用中，周向不均匀的径向磨损通常会发展到一定程度，在这种程度下，电刷将无法再跟踪换向器的径向轮廓，以保持与换向器的连续摩擦电接触，从而使APU直流起动发电机无法工作。开发了换向器-电刷动力学-磨损模型和相应的新计算机代码，以模拟换向器的磨损与运行时间的关系，以及该APU的若干设计和运行参数。这个新的分析代码用于模拟换向器360°接触弧周围的换向器随时间变化的径向磨损模式，特别是研究各种参数的影响，包括（a）初始制造的换向器径向跳动和（b）施加单位振动。这些模拟结果强烈表明，换向器不均匀磨损问题的根本原因是由60,000 rpm小型燃气轮机施加的过度单元振动，该燃气轮机通过行星齿轮减速器5：1与APU的12,000 rpm直流起动发电机相连。 。随后，来自涡轮机制造商的振动信息证实了这一结论，从而通过消除了涡轮机转子振动的根本原因，消除了换向器磨损问题。涡轮制造商的解决方法是改变涡轮转子轴向固定螺栓的材料，以消除严重的螺栓材料蠕变现象，该现象使涡轮转子在运行中变得松动。在机队中实施这种涡轮机修理可以消除换向器不均匀磨损的问题。显然，由此确定不是直流起动发电机制造商的产品不足，而是涡轮制造商的单元的螺栓材料不足。本文介绍了换向器-电刷动力学-磨损模型分析的开发和公式化，以及模拟结果，该仿真结果可精确复制过度磨损的APU换向器单元的磨损测量结果。

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