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Reduced-Order Modeling for the Coupling Vibration Analysis of Bladed Rotors Supported by Journal Bearings

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Abstract

Purpose

In the dynamic analysis of bladed rotors, bladed disks and rotors tend to be dealt with independently, where the former ones usually neglect the flexibility of shaft and the latter ones often assume the blade and disk to be rigid. This paper integrates these two aspects and presents a model order reduction method for bladed rotors supported by journal bearings.

Methods

The coupling vibration characteristics of a bladed rotor-bearing system are addressed, where the mistuning in blades and disk is taken into account. The governing equations of motion of rotating bladed rotor-bearing systems are developed by employing 3D finite element (FE) model and the eight-coefficient model of bearing. The order of the model is significantly reduced before further analysis, and the mistuning in blades and disk are integrated into the reduced-order model (ROM).

Results and Conclusion

The effectiveness of the proposed method is validated by comparing with the full-order model. Numerical results shown that the flexibility of shaft can lead to significant influences on the responses of mistuned bladed disk, in both one engine order (EO) and higher EOs of excitations. Besides, the bearing stiffness and disk mistuning have also non-negligible effects.

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Data Availability

The code/data used to support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

This work was supported by the Project of National Natural Science Foundation of China (No. 51805130) and the Fundamental Research Funds for the Central Universities (No. JZ2020HGTB0046).

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Authors and Affiliations

  1. Institute of Sound and Vibration Research, School of Mechanical Engineering, Hefei University of Technology, Hefei, 230009, People’s Republic of China

    Shuai Wang, Jiahang Li & Lei Sun

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  1. Shuai Wang
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  2. Jiahang Li
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Correspondence to Shuai Wang.

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Wang, S., Li, J. & Sun, L. Reduced-Order Modeling for the Coupling Vibration Analysis of Bladed Rotors Supported by Journal Bearings. J. Vib. Eng. Technol. 12, 3823–3839 (2024). https://doi.org/10.1007/s42417-023-01088-z

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  • DOI: https://doi.org/10.1007/s42417-023-01088-z

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