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Analysis of Torsional Dynamic Characteristics of Turbo-Generator Rotor Based on Cross Scale Modeling Method

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Abstract

Purpose

In this paper, the combined rotor system of turbo-generator is taken as the research object, and the variation law of interface contact stress, contact stiffness and torsional natural frequency of the combined rotor system during operation is deeply analyzed.

Method

A three-dimensional cross-scale dynamic model of the rotor is proposed based on the detailed research of the contact stress distribution characteristics and the contact stiffness between the combined rotor interfaces. By comparing the 3D simulation results with the experimental results, the essential reason why the natural frequency of the combined rotor varies with working conditions is explained. On this basis, by studying the influence of key structural parameters on the torsional vibration natural frequency of the combined rotor, a design method of torsional vibration natural frequency of the combined rotor based on the adjustment of structural parameters was proposed.

Results and conclusions

This paper provides an important reference and theoretical basis for the dynamic characteristic design of turbo generator combined rotor system. The simulation analysis accurately revealed the phenomenon of static and dynamic frequency drift in the turbo generator rotor system. Through the comparison with the measured results of the generator rotor, the simulation results of the three-dimensional cross-scale model are closer to the reality than other models, with higher accuracy. Through cross-scale dynamic simulation, it can be found that the interface contact stress and torsion natural frequency in the combined rotor have obvious coupling characteristics. Through the analysis of the key factors influencing the dynamic characteristics of the turbo generator rotor system, improving the interface stiffness of the rotor structure can effectively improve the torsional natural frequency of the system. The design of the long slot wedge, the high elastic modulus slot wedge, the improvement of the fit between the slot wedge and the rotating shaft, and the enhancement of the interface contact stress all effectively increase the stiffness of the system, thus increasing the natural frequency of the turbo generator rotor system.

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Acknowledgements

The work described in this paper is supported by the national natural science foundation of China (51705399).

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Authors and Affiliations

  1. Xi’an Jiaotong University, Xi’an, China

    Yuan Li, Yi Liu, Heng Liu, QiYuan He, Changlin Chen & YuPeng Yu

Authors
  1. Yuan Li
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  2. Yi Liu
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  3. Heng Liu
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  4. QiYuan He
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  5. Changlin Chen
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  6. YuPeng Yu
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Correspondence to Heng Liu.

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Li, Y., Liu, Y., Liu, H. et al. Analysis of Torsional Dynamic Characteristics of Turbo-Generator Rotor Based on Cross Scale Modeling Method. J. Vib. Eng. Technol. 10, 1055–1072 (2022). https://doi.org/10.1007/s42417-021-00428-1

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  • DOI: https://doi.org/10.1007/s42417-021-00428-1

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