Vibration response analysis of rotor system with initial thermal deformation

MA Yanhong; LIU Haizhou; DENG Wangqun; YANG Hai; HONG Jie

doi:10.13700/j.bh.1001-5965.2018.0309

Volume 45 Issue 2

Feb. 2019

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Journal of Beijing University of Aeronautics and Astronautics > 2019 > 45(2): 227-233.

MA Yanhong, LIU Haizhou, DENG Wangqun, et al. Vibration response analysis of rotor system with initial thermal deformation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(2): 227-233. doi: 10.13700/j.bh.1001-5965.2018.0309(in Chinese)

Citation:

MA Yanhong, LIU Haizhou, DENG Wangqun, et al. Vibration response analysis of rotor system with initial thermal deformation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(2): 227-233. doi: 10.13700/j.bh.1001-5965.2018.0309(in Chinese)

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Vibration response analysis of rotor system with initial thermal deformation

doi: 10.13700/j.bh.1001-5965.2018.0309

MA Yanhong^{1, 2},
LIU Haizhou¹,
DENG Wangqun^{3, 4},
YANG Hai^{3, 4},
HONG Jie^{1, 2
,
,}

1.
School of Energy and Power Engineering, Beihang University, Beijing 100083, China
2.
Collaborative Innovation Center of Advanced Aero-engine, Beijing 10008
3.
AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China
4.
Aviation Key Laboratory of Aero-engine Vibration Technology, Zhuzhou 412002, China

Funds:

National Natural Science Foundation of China 51575022

the Fundamental Research Funds for the Central Universities

More Information

Corresponding author: HONG Jie, E-mail:hongjie@buaa.edu.cn
Received Date: 28 May 2018
Accepted Date: 13 Jul 2018
Publish Date: 20 Feb 2019

Abstract

Abstract

Uneven temperature distribution of an aero-engine during hot restart can lead to initial thermal deformation of its rotors, which causes excessive engine vibration, or even a start-up failure. In view of the problem, this paper takes a typical rotor in aero-engines as an object, establishes its dynamic equation based on the effects of thermal deformation on vibration, and analyzes the effects of thermal deformation on vibration response of rotor system through modal coordinate transformation. The results show that thermal deformation is equivalent to additional excitations acting on the rotor, that is, initial shaft bow excitation, additional unbalance excitation and additional gyroscopic moment excitation, all of which are synchronous with the rotating speed. Moreover, the amplitude of unbalance and gyroscopic moment excitation is related to the rotating speed, therefore influencing rotor vibration response at different critical speeds to an equivalent extent, while that of initial shaft bow excitation is not related to the rotating speed and the response of low-order critical rotating speeds is more affected.
- rotor system,
- thermal deformation,
- initial bow,
- gyroscopic moment,
- unbalance

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References(16)

References

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