裂纹对叶片固有频率影响的分析

推进技术 ›› 1997, Vol. 18 ›› Issue (6): 68-71.

裂纹对叶片固有频率影响的分析

徐可君,江龙平

海军航空技术学院航空机械系!青岛;266041;海军航空技术学院航空机械系!青岛;266041

发布日期:2021-08-15

ANALYSIS OF EFFECT OF CRACK ON THE NATURAL FREQUENCY OF BLADE

Dept. of Mechanical Engineering, Navy Aviation Technique Academy, Qingdao, 266041;Dept. of Mechanical Engineering, Navy Aviation Technique Academy, Qingdao, 266041

Published:2021-08-15

摘要/Abstract

摘要： 给出了一种两条横向裂纹对叶片弯曲固有频率影响效果的分析方法。考虑的两种裂纹为周期载荷作用下产生的双面裂纹和脉冲载荷作用下产生的单面裂纹。分析中假设裂纹为沿叶宽等深度扩展的开口裂纹，同时将叶片看成无扭曲的短形等截面悬臂梁。结果表明，单纯选用固有频率识别裂纹参数，会过低估计裂纹严重程度；在可考察的裂纹深度范围内，单面和双面裂纹对固有频率的影响效果不显著。

关键词: 航空发动机;叶片;裂纹;振动力学

Abstract: A method for analysis of effect of two traverse cracks on the natural frequency of the flexural vibrations in a blade is presented’ Two types of crack are considered: double-sided crack, ocurring in the case of cyclic loadings, and single-sided, which in principle occur as a result of impulse loading. It is assumed that the blade is a nontorsional beam with rectangular cross-section, and the cracks extend through the width of the beam with constant depth.

Key words: Aircraft engine;Blade;Crack;Vibration mechanics

徐可君,江龙平. 裂纹对叶片固有频率影响的分析[J]. 推进技术, 1997, 18(6): 68-71.