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Nonlinear Dynamic Behavior of Circumferential Rod Fastened Rotor with Initial Thermal Deflection

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Abstract

Purpose

The rod fastened rotor-bearing system is widely used in heavy duty gas turbine. Under hot start condition, the rotor would produce the initial thermal deflection, the unbalance parameters of rotor would increase, the nonlinear dynamic behavior of system would be more complex. Therefore, it is necessary to investigate the nonlinear dynamic behavior of the system with initial thermal deflection.

Method

Nonlinear dynamic model of rod fastened rotor-bearing system is established considering circumferential temperature contrast, initial preload force and nonlinear oil-film force, etc. The effects of circumferential temperature contrast and initial preload force on the nonlinear dynamic behavior of system have been simulated by the fourth-order Runge–Kutta method.

Result

The initial thermal deflection is introduced into the nonlinear dynamic model of rod fastened rotor-bearing system. The effects of preload force, circumferential temperature contrast and nonlinear oil-film force on the dynamic characteristics of rotor system are studied. The numerical results reveal periodic-1, periodic-2, periodic-3, quasi-periodic, and chaotic solutions, etc. of the rich and complex nonlinear behaviors of the system. It is also founded that the preload and circumferential temperature contrast are the main factors affecting the dynamic behavior of the system.

Conclusion

This paper established the nonlinear dynamic model of rod fastened rotor-bearing system. The acquisition of nonlinear dynamic behavior would provide a theoretical basis for the hot start and other problems. The contents and methods can provide guidance for the fault diagnosis of rod fastened rotors with initial thermal deflection. Meanwhile, this research may contribute to further understanding the nonlinear dynamic behaviors of the system under complex temperature field.

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Acknowledgements

This work was supported by the National Science and Technology Major Projects (2017-IV-0010-0047).

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Authors and Affiliations

  1. Key Laboratory of Light Duty Gas Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China

    Jiaqi Li, Yao Li, Guyun Mo, Wenyuan Zhong & Yinli Feng

  2. School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

    Jiaqi Li, Yao Li, Guyun Mo, Wenyuan Zhong & Yinli Feng

  3. Innovation Academy for Light-Duty Gas Turbine, Chinese Academy of Science, Beijing, 100190, China

    Jiaqi Li, Yao Li, Guyun Mo, Wenyuan Zhong & Yinli Feng

  4. Beijing Institute of Astronautical Systems Engineering, Beijing, 100076, China

    Lei Cui

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  1. Jiaqi Li
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  2. Yao Li
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  3. Lei Cui
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  4. Guyun Mo
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  5. Wenyuan Zhong
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  6. Yinli Feng
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Correspondence to Jiaqi Li.

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Li, J., Li, Y., Cui, L. et al. Nonlinear Dynamic Behavior of Circumferential Rod Fastened Rotor with Initial Thermal Deflection. J. Vib. Eng. Technol. 10, 767–780 (2022). https://doi.org/10.1007/s42417-021-00407-6

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  • DOI: https://doi.org/10.1007/s42417-021-00407-6

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