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<p>The response characteristics of a complex dual-disk rotor-bearing system and the load distribution of rolling bearings under coupling faults are studied. According to the structural characteristics of the aero-engine dual-rotor system, a dynamic model of the asymmetric dual-disc dual-rotor-bearing-casing coupling system was established. The model took into account nonlinear factors such as radial clearance of rolling bearings, Hertz contact and VC vibration, as well as the coupling between high-voltage rotor and low-pressure rotor, rolling bearing and casing. Combined with rotor–stator rubbing, bearing raceway waviness, rotating shaft breathing crack and local raceway defects of inter-shaft bearing determined by the three dimensions of raceway circumferential, axial and radial. Runge–Kutta methods is used to solve the model, and the simulation results verify the correctness of the model. By means of bifurcation diagrams, time domain diagram, waterfall diagram, Poincaré sections and spectrum, the system response under different fault states and the corresponding load distribution and fatigue life of rolling bearings are studied. The results show that: (1) Increasing the speed ratio from 1 to 1.6 will complicate and disorder the vibration response of the system, reducing the stability of the system, and the high-speed range above 10000&#xa0;rpm is more obvious; The operation stability of the rotor system can be effectively improved by rational axial arrangement of the disk. Correct selection of bearing radial clearance can improve bearing fatigue life and operating stability (−2um is the best). (2) There are two critical speeds in the two-disk rotor system with respiratory crack-wear coupling failure; The corresponding relationship between the system response and crack Angle is periodic, and the period is 2pi. When the dimensionless crack depth increases to 0.6, the stability of the system will be significantly reduced. (3) Waviness defects and raceway spalling defects will significantly affect system vibration response, rolling body load distribution and rolling bearing fatigue.</p>

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Nonlinear dynamic response and load distribution of coupled fault complex dual-disk rotor-bearing system

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Hongchuan Cheng,
  • Guohui Ma,
  • Xinhai Li,
  • Yu Cui,
  • Zhiwu Shang

摘要

The response characteristics of a complex dual-disk rotor-bearing system and the load distribution of rolling bearings under coupling faults are studied. According to the structural characteristics of the aero-engine dual-rotor system, a dynamic model of the asymmetric dual-disc dual-rotor-bearing-casing coupling system was established. The model took into account nonlinear factors such as radial clearance of rolling bearings, Hertz contact and VC vibration, as well as the coupling between high-voltage rotor and low-pressure rotor, rolling bearing and casing. Combined with rotor–stator rubbing, bearing raceway waviness, rotating shaft breathing crack and local raceway defects of inter-shaft bearing determined by the three dimensions of raceway circumferential, axial and radial. Runge–Kutta methods is used to solve the model, and the simulation results verify the correctness of the model. By means of bifurcation diagrams, time domain diagram, waterfall diagram, Poincaré sections and spectrum, the system response under different fault states and the corresponding load distribution and fatigue life of rolling bearings are studied. The results show that: (1) Increasing the speed ratio from 1 to 1.6 will complicate and disorder the vibration response of the system, reducing the stability of the system, and the high-speed range above 10000 rpm is more obvious; The operation stability of the rotor system can be effectively improved by rational axial arrangement of the disk. Correct selection of bearing radial clearance can improve bearing fatigue life and operating stability (−2um is the best). (2) There are two critical speeds in the two-disk rotor system with respiratory crack-wear coupling failure; The corresponding relationship between the system response and crack Angle is periodic, and the period is 2pi. When the dimensionless crack depth increases to 0.6, the stability of the system will be significantly reduced. (3) Waviness defects and raceway spalling defects will significantly affect system vibration response, rolling body load distribution and rolling bearing fatigue.