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<p>To investigate the dynamic behavior of the shearer cutting gear transmission system under compound gear spalling and bearing inner race defect, a dynamic model with 16 degrees of freedom (16-DOF) was established using the lumped parameter approach. Firstly, considering stiffness excitation, error excitation and meshing impact excitation, a time-varying meshing stiffness model of gears is established based on the potential energy method. A model for stiffness degradation under spalling fault is derived. Then, the dynamic behavior of the defective bearing was modeled by analyzing additional displacements and nonlinear excitation forces caused by inner race defects. A coupled dynamic model was constructed to account for the interaction between gear and bearing subsystems. The results show that gear spalling tends to produce periodic high-amplitude impacts and modulated harmonics. The compound faults exacerbate the nonlinearity of the system. Heavy loads will increase the amplitude of vibration. High speed excites higher-order modes and shifts the dominant frequency toward the high-frequency range. The results indicate that spalling and compound defects significantly affect the system dynamics, providing theoretical support for fault diagnosis and dynamic optimization of the shearer cutting tooth system under complex conditions.</p>

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Dynamic characteristics of shearer gear transmission system with spalling fault

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Ronghua Chen,
  • Jiaxu Zhao,
  • Xiangning Lu,
  • Guo Ye,
  • Lianchao Sheng

摘要

To investigate the dynamic behavior of the shearer cutting gear transmission system under compound gear spalling and bearing inner race defect, a dynamic model with 16 degrees of freedom (16-DOF) was established using the lumped parameter approach. Firstly, considering stiffness excitation, error excitation and meshing impact excitation, a time-varying meshing stiffness model of gears is established based on the potential energy method. A model for stiffness degradation under spalling fault is derived. Then, the dynamic behavior of the defective bearing was modeled by analyzing additional displacements and nonlinear excitation forces caused by inner race defects. A coupled dynamic model was constructed to account for the interaction between gear and bearing subsystems. The results show that gear spalling tends to produce periodic high-amplitude impacts and modulated harmonics. The compound faults exacerbate the nonlinearity of the system. Heavy loads will increase the amplitude of vibration. High speed excites higher-order modes and shifts the dominant frequency toward the high-frequency range. The results indicate that spalling and compound defects significantly affect the system dynamics, providing theoretical support for fault diagnosis and dynamic optimization of the shearer cutting tooth system under complex conditions.