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Research on blade modal testing method based on 3D scanning laser Doppler vibration measurement technology

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DOI: 10.23977/ESAC2020010


Qi Wang, Jing Zhu, Jiangbo Dai, Shunguo Fu, Xianqiang Luo, Haibo Feng

Corresponding Author

Qi Wang


The 1D modal test and 3D modal test of an aero engine turbine blade were studied based on the theory of 3D scanning laser Doppler vibration test. Through the identification of modal parameters, the first six natural frequencies of the blade and their corresponding modal modes are obtained. The 1D, 3D modal test results and finite element analysis results of the blades are compared and verified. The results show that the 3D scanning laser Doppler modal test method can obtain the 3D full field mode of the accurate test of light-weight and small-scale structural modal parameters without the influence of additional mass and additional rigidity.


Turbine blade; scanning laser Doppler vibration; modal test; 3D vibration test

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