Investigation on dynamic characteristics of a rod fastening rotor-bearing coupling system with fixed-point rubbing

doi:10.1007/s10483-022-2819-7

Applied Mathematics and Mechanics (English Edition) ›› 2022, Vol. 43 ›› Issue (7): 1063-1080.doi: https://doi.org/10.1007/s10483-022-2819-7

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Investigation on dynamic characteristics of a rod fastening rotor-bearing coupling system with fixed-point rubbing

Yang YANG¹, H. J. OUYANG², Jin ZENG¹, Hui MA³, Yiren YANG¹, Dengqing CAO⁴

1. School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Centre for Engineering Dynamics, School of Engineering, University of Liverpool, Liverpool L69 3GH, U. K.;
3. School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China;
4. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China

Received:2021-09-30 Revised:2021-12-13 Online:2022-07-01 Published:2022-06-30
Contact: Yang YANG, E-mail: 181042yy@163.com
Supported by:
the National Natural Science Foundation of China (No. 12172307), the Key Laboratory of Vibration and Control of Aero-Propulsion System, Ministry of Education, Northeastern University of China (No. VCAME202103), and the Fundamental Research Funds for the Central Universities in Southwest Jiaotong University of China (No. 2682021ZTPY036)

Abstract

Abstract: The aim of this paper is to gain insight into the nonlinear vibration feature of a dynamic model of a gas turbine. First, a rod fastening rotor-bearing coupling model with fixed-point rubbing is proposed, where the fractal theory and the finite element method are utilized. For contact analysis, a novel contact force model is introduced in this paper. Meanwhile, the Coulomb model is adopted to expound the friction characteristics. Second, the governing equations of motion of the rotor system are numerically solved, and the nonlinear dynamic characteristics are analyzed in terms of the bifurcation diagram, Poincaré map, and time history. Third, the potential effects provided by contact degree of joint interface, distribution position, and amount of contact layer are discussed in detail. Finally, the contrast analysis between the integral rotor and the rod fastening rotor is conducted under the condition of fixed-point rubbing.

Key words: rod fastening rotor, joint interface, fixed-point rubbing, nonlinear dynamic characteristic

2010 MSC Number:

74K30

Yang YANG, H. J. OUYANG, Jin ZENG, Hui MA, Yiren YANG, Dengqing CAO. Investigation on dynamic characteristics of a rod fastening rotor-bearing coupling system with fixed-point rubbing. Applied Mathematics and Mechanics (English Edition), 2022, 43(7): 1063-1080.

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Investigation on dynamic characteristics of a rod fastening rotor-bearing coupling system with fixed-point rubbing

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