Digital mechanism modeling and vibration characteristic analysis for stator end winding of large turbo-generator

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (7) : 143-153.

WANG Ting1,2, WANG Hui3, ZHAO Yang3,4, LI Xinghong3

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Abstract

A high-precise finite element model of a 600MW large turbo-generator stator end winding is established. The modal parameters are obtained by modal analysis, which are in good agreement with the experimental data. Then, the digital mechanism model of stator end winding is set up. In the model, the shell is used to model double-layer winding and the supporting structures are treated as ring stiffeners and stringer stiffeners. Based on the discrete element method, the equivalent model of stiffened and ribbed conical shell for end winding can be established. After that, the natural and forced vibration equations of the end winding are established by Rayleigh- Ritz method with improved Fourier series which is suitable for different complex elastic boundary conditions. With the digital mechanism model, the modal parameters of end winding are determined. Comparing with the simulation results obtained by the finite element model, the rationality and correctness of the proposed digital mechanism model are verified.

Key words

stator end winding / model parameters / finite element analysis / vibration analysis / mechanism model

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WANG Ting1,2, WANG Hui3, ZHAO Yang3,4, LI Xinghong3. Digital mechanism modeling and vibration characteristic analysis for stator end winding of large turbo-generator[J]. Journal of Vibration and Shock, 2023, 42(7): 143-153

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