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Purpose <p>To investigate the dynamics of non-synchronous contact and dry-friction-induced backward whirl motion between the rotor and stator, a simulation study concentrating on rotor-stator contact was performed.</p> Methods <p>A model of rotor-stator contact was developed, and the forward and backward whirl frequencies of the rotor were obtained by solving the characteristic equations. The fourth-order Runge-Kutta method was used to solve the equations of motion, and an event detection function facilitated the identification of contact states, enabling analysis of the rotor’s motion under varying friction coefficients.</p> Results <p>The results show that the rotor’s amplitude jumps at the critical&#xa0;speed, and the system exhibits two non-synchronous contact speed&#xa0;intervals across different friction coefficients. Specifically, at friction&#xa0;coefficients of 0.12 and 0.14, the system exhibits dry-friction backward&#xa0;whirl speed intervals that include an internal resonance region and a high&#xa0;radial displacement region. Additionally, as the friction coefficient&#xa0;increases, the high radial displacement region tends to expand. As the&#xa0;rotational speed rises, the dry-friction backward whirl frequency also increases.</p> Conclusions <p>This study will provide useful characteristics of asynchronous&#xa0;contact and dry friction backward whirl caused by rotor-stator contact for real application.</p>

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Study on Asynchronous Contact and Dry Friction Backward Whirl Caused by rotor-stator Contact

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Haifei Wang,
  • Tianyi Ding,
  • Lishi Yan,
  • Shuai Zhou,
  • Chao Dong

摘要

Purpose

To investigate the dynamics of non-synchronous contact and dry-friction-induced backward whirl motion between the rotor and stator, a simulation study concentrating on rotor-stator contact was performed.

Methods

A model of rotor-stator contact was developed, and the forward and backward whirl frequencies of the rotor were obtained by solving the characteristic equations. The fourth-order Runge-Kutta method was used to solve the equations of motion, and an event detection function facilitated the identification of contact states, enabling analysis of the rotor’s motion under varying friction coefficients.

Results

The results show that the rotor’s amplitude jumps at the critical speed, and the system exhibits two non-synchronous contact speed intervals across different friction coefficients. Specifically, at friction coefficients of 0.12 and 0.14, the system exhibits dry-friction backward whirl speed intervals that include an internal resonance region and a high radial displacement region. Additionally, as the friction coefficient increases, the high radial displacement region tends to expand. As the rotational speed rises, the dry-friction backward whirl frequency also increases.

Conclusions

This study will provide useful characteristics of asynchronous contact and dry friction backward whirl caused by rotor-stator contact for real application.