Full-Field Vibration of Turbine Blade Based on Single-Camera High-Speed 3D Digital Image Correlation
谢瑞丽 1许巍 2陈新 2潘兵1
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作者信息
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
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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.
Abstract
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 charac-teristics,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 3D-DIC 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
Key words
digital image correlation/turbine blade/vibration test/single high-speed camera/modal experiment
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