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Purpose of research <p>To investigate the complex dynamic behavior of a marine rotor-bearing coupled floating raft-airbag system under multiple excitations, a coupled dynamic model is established that accounts for the excitation effects for hull heave, pitch and roll coupled motion inertia force, rotor unbalance force and nonlinear oil film force. </p> Research contents <p>The dynamics equation of the system is established based on Lagrange’s equation, and the influence of rotor speed and motion parameters on the nonlinear dynamic behavior of the system is investigated through numerical simulations. </p> Research conclusions <p>The results indicate that the multiple excitations significantly change the vibration characteristics of the system. Heave-pitch-roll coupled motion increases the amplitude of both the rotor and the floating raft, while decreases the resonance speed threshold. As the rotational speed increases, the motion state of the system experiences the evolution from quasi-periodic to chaotic. In the resonance region, the amplitude of the rotor increases nonlinearly with the amplitude of heave and pitch, and the amplitude jumps occur at high speed. The amplitude of the floating raft increases linearly with heave amplitude, but parabolically with amplitude of pitch and roll.</p>

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Nonlinear Dynamic Characteristics of Marine Rotor Bearing-Floating Raft Airbag Coupling System UNDER Multiple Excitations

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Xinke Liu,
  • Ming Li,
  • Haijian Liu,
  • Weijie Dai,
  • Yifeng Wei,
  • Weihua Zuo

摘要

Purpose of research

To investigate the complex dynamic behavior of a marine rotor-bearing coupled floating raft-airbag system under multiple excitations, a coupled dynamic model is established that accounts for the excitation effects for hull heave, pitch and roll coupled motion inertia force, rotor unbalance force and nonlinear oil film force.

Research contents

The dynamics equation of the system is established based on Lagrange’s equation, and the influence of rotor speed and motion parameters on the nonlinear dynamic behavior of the system is investigated through numerical simulations.

Research conclusions

The results indicate that the multiple excitations significantly change the vibration characteristics of the system. Heave-pitch-roll coupled motion increases the amplitude of both the rotor and the floating raft, while decreases the resonance speed threshold. As the rotational speed increases, the motion state of the system experiences the evolution from quasi-periodic to chaotic. In the resonance region, the amplitude of the rotor increases nonlinearly with the amplitude of heave and pitch, and the amplitude jumps occur at high speed. The amplitude of the floating raft increases linearly with heave amplitude, but parabolically with amplitude of pitch and roll.