裂纹参数对航空发动机叶片频率转向特性影响研究

张俊红;杨 硕;刘 海;林杰威

振动与冲击 ›› 2014, Vol. 33 ›› Issue (20) : 7-11.

PDF(1724 KB)
PDF(1724 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (20) : 7-11.
论文

裂纹参数对航空发动机叶片频率转向特性影响研究

  • 张俊红,杨 硕,刘 海,林杰威
作者信息 +

Study on the influence of crack parameters on the frequency veering characteristic of the aero-engine blade

  • ZHANG Jun-hong,YANG Shuo,LIU Hai,LIN Jie-wei
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摘要

针对叶片运行中产生的疲劳裂纹会改变航空发动机振动特性及其频率转向、振型转换问题,建立航空发动机叶片有限元模型,基于结构模态振动理论研究裂纹参数,包括裂纹长度、裂纹位置变化对叶片固有振动及受迫振动特性影响;讨论频率转向区附近频率、振型变化规律。结果表明,裂纹长度、位置变化会逐渐改变叶片频率及振型,出现复杂的频率转向、模态耦合及振型转换特性,导致叶片同阶振动模态在不同裂纹长度、位置时具有不同的模态振型。

Abstract

Fatigue cracks generated during operation would alter the aero-engine blade vibration characteristics, manifested as frequency veering and mode shape switching. Study on the frequency veering can lead us to a further understanding of the blade crack evolution process. After building the FEM of aero-blade, the influence of crack parameters (crack location and length) on blade natural vibration and forced vibration characteristics was studied based on structural modal vibration theory, focusing on the variation laws of vibration frequency and mode shapes in the frequency veering area. The research shows that crack location and length variation would affect the blade frequencies and mode shapes, and thus lead to complex frequency veering, mode coupling and mode shape switching characteristics, which explains why mode shapes alter with the crack length and location in the same vibration mode.


关键词

航空发动机叶片 / 裂纹 / 振动特性 / 频率转向 / 振型转换

Key words

aero-engine blade / blade crack / vibration characteristic / frequency veering / mode shape switching

引用本文

导出引用
张俊红;杨 硕;刘 海;林杰威. 裂纹参数对航空发动机叶片频率转向特性影响研究[J]. 振动与冲击, 2014, 33(20): 7-11
ZHANG Jun-hong;YANG Shuo;LIU Hai;LIN Jie-wei. Study on the influence of crack parameters on the frequency veering characteristic of the aero-engine blade[J]. Journal of Vibration and Shock, 2014, 33(20): 7-11

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