不同温度下含裂纹压气机叶片的模态特征和振动特性分析  

Analysis of modal characteristics and vibration characteristics of cracked compressor blades at different temperatures

作　　者：周震霆 贺星[1] 刘永葆[1] ZHOU Zhen-ting;HE Xing;LIU Yong-bao(School of Power Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033

出　　处：《舰船科学技术》2023年第12期93-98,共6页Ship Science and Technology

基　　金：国家科技重大专项。

摘　　要：本文选取含裂纹悬臂梁模拟含裂纹压气机叶片,基于无质量扭转弹簧和呼吸式裂纹刚度模型,得到一种不同环境温度下含裂纹压气机叶片的模态特征和振动特性的分析方法。通过弹性模量引入温度模块,利用无质量扭转弹簧连续条件得到关于含裂纹梁的特征方程,分析环境温度和裂纹深度对含裂纹梁固有频率的影响;利用悬臂梁的强迫弯曲振动方程,引入呼吸式裂纹刚度模型,改变激振力频率,分析环境温度及激振频率对含裂纹梁振动位移响应的影响。结果表明,环境温度越高,含裂纹梁的固有频率越小,梁的振动位移响应越大。同时,激振频率的选取也具有一定影响。In this paper,a cracked cantilever beam is selected to simulate a cracked compressor blade.Based on a massless torsion spring and a breathing crack stiffness model,a method for analyzing the modal characteristics and vibration characteristics of a cracked compressor blade at different ambient temperatures is obtained.The elastic modulus is introduced into the temperature module,and the characteristic equation about the cracked beam is obtained by using the continuous condition of the massless torsion spring,and the influence of the ambient temperature and crack depth on the natural frequency of the cracked beam is analyzed;the forced bending vibration equation of the cantilever beam is used to introduce the breathing The crack stiffness model was used to change the excitation force frequency to analyze the influence of ambient temperature and excitation frequency on the vibration displacement response of the beam with cracks.The results show that the higher the ambient temperature,the smaller the natural frequency of the beam with cracks,and the greater the vibration displacement response of the beam;at the same time,the selection of the excitation frequency also has a certain influence.

关 键 词：压气机叶片 呼吸式裂纹 温度 模态特征 振动特性 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]