基于单高速相机3D-DIC的涡轮叶片全场振动测量  

Full⁃Field Vibration of Turbine Blade Based on Single⁃Camera High⁃Speed 3D Digital Image Correlation

作　　者：谢瑞丽 许巍 陈新 潘兵[1] XIE Ruili;XU Wei;CHEN Xin;PAN Bing(School of Aeronautic Science and Engineering,Beihang University Beijing,100191,China;Beijing Institute of Aeronautical Materials,Aero Engine Corporation of China Beijing,100195,China)

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191 [2]中国航发北京航空材料研究院,北京100195

出　　处：《振动．测试与诊断》2024年第1期18-23,194,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家科技重大专项资助项目(J2019-V-0006-0099);国家自然科学基金资助项目(11925202)。

摘　　要：采用成本较低、结构紧凑且使用便捷的单高速相机三维数字图像相关方法(single-camera high-speed three-dimensional digital image correlation,简称SCHS 3D-DIC)对涡轮叶片的振动特性进行试验研究。首先,介绍了测量装置和原理,以悬臂铝板为对象开展验证试验,结果证明了该测量系统的准确性与有效性;其次,开展了叶片的全场振动特性测量,得到了其三维形貌、模态特性、全场位移与应变分布,获得了叶片在振动载荷作用下的高应变区域位置及应变分布特点。研究表明,SCHS 3D-DIC方法相比常规双高速相机3D-DIC方法具有更高的视场利用率,适合于细长型的涡轮叶片的振动测量试验。A single-camera high-speed three-dimensional digital image correlation(SCHS 3D-DIC)method,which is low-cost,compact,and easy-to-implement,is adopted to test the vibration characteristics of turbine blade by using a four-mirror adapter.Firstly,the configuration and measurement principle of the SCHS 3D-DIC system are introduced.The verification test based on a cantilever aluminum plate is carried out.On this basis,the full-field vibration characteristics of the blade are tested,in order to obtain its 3D morphology,modal characteristics,full-field displacement and strain field distribution.The position and distribution characteristics of the high-strain region of the blade under vibration excitation are determined.The results show that the SCHS 3DDIC has a higher utilization rate of field of view as compared with the conventional dual-camera 3D-DIC,which is suitable for the vibration measurement test of the slender turbine blade.

关 键 词：数字图像相关 涡轮叶片 振动测量 单高速相机 模态试验 

分 类 号：TH825[机械工程—仪器科学与技术] O348.1[机械工程—精密仪器及机械]