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Background <p>Because of the large-scale development of rotating machinery, the multi-span bearing rotor system exists excessive vibration under the complex working conditions. The instability of rotor system maybe caused by the excessive vibration.</p> Purpose <p>The purpose of this study is to establish a dynamic model of a multi-span rotor system supported by sliding bearings, accurately analyze its critical speed and unbalanced response, and then propose a structural parameter adjustment strategy to suppress vibration and improve stability.</p> Methods <p>The multi-span rotor system supported by sliding bearings is taken as the research object in this paper. The dynamic model of the multi-span bearing rotor system is established. The modal analysis and unbalanced response analysis of the rotor system can be obtained by the theoretical calculation. Based on the excessive vibration of the rotor system, the structural parameter adjustment measures are proposed to control vibration. The test bench of the multi-span bearing rotor system is designed based on the proposed structural parameter adjustment measures.</p> Results <p>The theoretical calculation results of the critical speed of the rotor system are 2280r/min and 3870r/min. The vibration amplitude of the rotor system is significantly reduced by the structural parameter adjustment. The critical speed of the rotor system is 2260r/min. The maximum amplitude of the rotor system before structural parameter adjustment reached 60 μm. But the maximum amplitude of the rotor system is reduced to 45 μm by the structural parameter adjustment. The test results of the critical speed basically correspond to the theoretical calculation results.</p> Conclusion <p>The critical speed and vibration amplitude characteristics of the multi-span rotor bearing system are accurately analyzed by the dynamic theoretical model. Through the adjustment of structural parameters, the vibration of the system is effectively reduced and the operation stability is improved. Finally, the experimental results verify the accuracy of the dynamic modeling and vibration control strategy.</p>

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Dynamic Analysis and Vibration Control of Multi-span Bearing Rotor System

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Runlin Chen,
  • Rushen Deng,
  • Weihao Chen,
  • Yimo Wang,
  • Wenhui Li,
  • Peiji Yang

摘要

Background

Because of the large-scale development of rotating machinery, the multi-span bearing rotor system exists excessive vibration under the complex working conditions. The instability of rotor system maybe caused by the excessive vibration.

Purpose

The purpose of this study is to establish a dynamic model of a multi-span rotor system supported by sliding bearings, accurately analyze its critical speed and unbalanced response, and then propose a structural parameter adjustment strategy to suppress vibration and improve stability.

Methods

The multi-span rotor system supported by sliding bearings is taken as the research object in this paper. The dynamic model of the multi-span bearing rotor system is established. The modal analysis and unbalanced response analysis of the rotor system can be obtained by the theoretical calculation. Based on the excessive vibration of the rotor system, the structural parameter adjustment measures are proposed to control vibration. The test bench of the multi-span bearing rotor system is designed based on the proposed structural parameter adjustment measures.

Results

The theoretical calculation results of the critical speed of the rotor system are 2280r/min and 3870r/min. The vibration amplitude of the rotor system is significantly reduced by the structural parameter adjustment. The critical speed of the rotor system is 2260r/min. The maximum amplitude of the rotor system before structural parameter adjustment reached 60 μm. But the maximum amplitude of the rotor system is reduced to 45 μm by the structural parameter adjustment. The test results of the critical speed basically correspond to the theoretical calculation results.

Conclusion

The critical speed and vibration amplitude characteristics of the multi-span rotor bearing system are accurately analyzed by the dynamic theoretical model. Through the adjustment of structural parameters, the vibration of the system is effectively reduced and the operation stability is improved. Finally, the experimental results verify the accuracy of the dynamic modeling and vibration control strategy.