An improved substructure modeling method for mistuned blisk

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (12) : 299-308.

JIA Zichu, LIANG Daosen, CAO Zhifu, YAO Jianyao

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Abstract

An improved substructure modeling and analysis method is proposed to reduce the computational cost in vibration analysis of a complex mistuned blisk. The blisk is divided into blade substructures and a disk substructure according to the geometric feature. Then, the reduced interfacial degrees of freedom are evenly selected and transformed into internal degrees of freedom of substructure by the coordinate transformation matrix. Finally, the substructure method is used to condense the internal degrees of freedom of the substructure and the interface, and the reduction model of the blisk is established. The mistuning level of the blisk was evaluated under typical hazardous excitation cases by using the improved substructure analysis model. The results show that this proposed method can efficiently analyze the dynamic response of the mistuned blisk while ensuring computational accuracy.

Key words

substructure / interface reduction / mistuned blisk / amplitude control

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JIA Zichu, LIANG Daosen, CAO Zhifu, YAO Jianyao. An improved substructure modeling method for mistuned blisk[J]. Journal of Vibration and Shock, 2023, 42(12): 299-308

References

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