Identification method of crystal orientation for single-crystal turbine blade

Houxin She, Yan Jiang, Qingyang Shen,Chaoping Zang, Weimini Geng

MECHANICAL SYSTEMS AND SIGNAL PROCESSING(2024)

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Abstract
An effective method is developed in this study to identify the crystal orientation of Nickel-based single crystal turbine blade based on the influence law of crystal orientation on modal properties. Firstly, the calculation results obtained by using the high-fidelity model at the design points are referenced to construct the surrogate models of natural frequencies and normalized mode shapes based on the Kriging method. These surrogate models make it possible to determine the modal properties in any crystal orientation in a highly efficient way. Then, the 3D Scanning Laser Doppler Vibrometer (3D SLDV) technique is applied to the single crystal blade with unknown crystal orientation for obtaining the modal properties. It is also the first work to use 3D SLDV technique for experiment modal test on the single crystal blade to identify the crystal orientation. Finally, the objective function is constructed based on the modal properties obtained from surrogate model with respect to the result from the modal test of undefined single crystal blade. Artificial fish swarm algorithm (AFSA) is applied to continuously optimize the defined objective function for identifying the crystal orientation of single crystal blade. Compared with other methods for identifying the crystal orientation of single-crystal blades, the proposed method is able to obtain the crystal orientation accurately without the complicated test procedure and special test instruments. Meantime, the proposed method does not cause any damage to the single crystal blade. The high efficiency and high applicability of the proposed method are verified numerically, and then applied to a group of single crystal blades with unknown crystal orientations.
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Key words
Single -crystal blades,Crystal orientation,Identification method,Modal test,Surrogate models
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