2026/01/01 by Jiaxu Zhao, Xuwei Shen, Xiangning Lu +2
paper · doi:10.1139/tcsme-2025-0256
Due to the electromagnetic vibration of the driving motor and the dynamic meshing excitation of the transmission gears, it is very prone to electromechanical coupling vibration. The superimposed vibration frequency is a significant challenge to vibration source location and vibration suppression. An investigation was performed to gain insights into the operation of a coal mining machine’s transmission system during problematic conditions. First, a math model for controlling the permanent magnet motor is built to find the control settings. The decoupling mechanism of motor current was revealed. Subsequently, time-varying mesh stiffness models were developed for both normal operating conditions and gear spalling fault scenarios. The changes in how stiffness varies over time when there are spalling faults were explained. Finally, considering factors such as gear error, tooth side clearance, and bearing stiffness, the dynamic model of the cutting part of the coal shearer was established. The influence laws of internal excitation, load impact, and spalling failure on the dynamic characteristics of the system’s electromechanical coupling were studied, and the typical features of gear spalling failure were extracted. The study’s results are crucial for comprehending how to assess the state and minimize vibrations in the transmission systems of coal mining equipment.