基于单高速相机 3D‑DIC 的涡轮叶片全场振动测量

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 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.