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<p>To search for intelligent diagnostic methods for predictive maintenance in the industry, this paper deals with the investigation of the effect of transient operating conditions on electromechanical systems monitoring in the presence of gear tooth defects. It consists of modeling the dynamic behavior of a&#xa0;complex multi-physics system composed of shafts, bearings, and a&#xa0;gear reducer driven by an induction motor and subjected to a&#xa0;time-varying load torque. In these systems, the variable load induces a&#xa0;variable angular speed of the rotating machine. This work is motivated by the practical difficulties that transient operating conditions pose for monitoring and diagnosis of multidisciplinary systems. Therefore, a&#xa0;mathematical model describing the global system has been developed. Using this model, we study the mesh stiffness as a&#xa0;function of instantaneous rotational speed. The simulation results show the interaction between the different sub-systems (electrical and mechanical units). The motor current signal analysis shows a&#xa0;combined amplitude and frequency modulation by the characteristic frequencies of motor, load, gearbox and defects.</p>

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Electromechanical system modeling and monitoring under transient conditions: time-angular domain comparison

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Najib Belhadj Messaoud,
  • Nabih Feki,
  • Ahmed Ghorbel,
  • Mohamed Haddar

摘要

To search for intelligent diagnostic methods for predictive maintenance in the industry, this paper deals with the investigation of the effect of transient operating conditions on electromechanical systems monitoring in the presence of gear tooth defects. It consists of modeling the dynamic behavior of a complex multi-physics system composed of shafts, bearings, and a gear reducer driven by an induction motor and subjected to a time-varying load torque. In these systems, the variable load induces a variable angular speed of the rotating machine. This work is motivated by the practical difficulties that transient operating conditions pose for monitoring and diagnosis of multidisciplinary systems. Therefore, a mathematical model describing the global system has been developed. Using this model, we study the mesh stiffness as a function of instantaneous rotational speed. The simulation results show the interaction between the different sub-systems (electrical and mechanical units). The motor current signal analysis shows a combined amplitude and frequency modulation by the characteristic frequencies of motor, load, gearbox and defects.