摘要
为了实现叶片振动特性的高精度、多点、非接触测量,对激光多普勒测振原理与应用进行了研究,将激光测振技术引入到叶片振动特性测试中,搭建了1套非接触式声激励测振系统。以某型航空发动机压气机第2级叶片为研究对象,测量出叶片表面153个测点的响应、5kHz内的前5阶固有频率和振型、前3阶应力分布,并将试验结果与有限元分析以及传统振动特性试验采用共振法、模态法获得的振动特性结果进行对比。结果表明:非接触激光测振法可以同时获得叶片高阶模态和全场应力分布,弥补了传统振动特性试验的不足。测得叶片频率与采用共振法、模态法得到的结果相比误差在1%以内,相对应力分布与有限元分析结果基本一致,证明了该新型叶片振动特性试验方法的正确性与先进性。
In order to achieve the blade vibration characteristics of high precision,multi-point,non-contact measurement,the principle and application of laser Doppler vibration measurement were studied,laser vibration measurement technology was introduced into blade vibration measurement,and a set of non-contact acoustic excitation vibration measurement system was set up.Taking the second-stage blade of an aeroengine compressor as the research object,the responses of 153 measuring points on the blade surface,the first 5 order natural frequencies and modes within 5 kHz,and the first 3 order stress distribution were measured,and the experimental results were compared with the finite element analysis and the vibration characteristics obtained by traditional vibration characteristics test using resonance method and modal method.The results show that the non-contact laser vibration measurement method can obtain the high order mode and the full field stress distribution of the blade simultaneously,which makes up the deficiency of the traditional vibration characteristic test.Compared with resonance method and modal method,the measured blade frequency error is less than 1%,and the relative stress distribution is basically consistent with the finite element analysis results,which proves the correctness and advance of the new blade vibration characteristics test method.
作者
张琦
王洪斌
姜睿
杜传宇
ZHANG Qi;WANG Hong-bin;JIANG Rui;DU Chuan-yu(AECC Shenyang Engine Research Institution,Shenyang 110015,China)
出处
《航空发动机》
北大核心
2022年第1期76-82,共7页
Aeroengine
基金
航空动力基础研究项目资助。
关键词
非接触测量
振动特性
叶片
航空发动机
non-contact measurement
vibration characteristics
blade
aeroengine
