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<p>The propulsion shafting of ships is prone to multi-fault coupled vibrations, causing abnormal deformation or fracture. Among these, coupling misalignment and propeller imbalance often induce transverse-torsional coupling vibration, yet most studies address them separately. This paper investigates their synergistic effects by establishing mechanical models that incorporate torsional vibration through geometric force analysis. A transverse-torsional coupled dynamics model is derived via the Lagrange equation and finite element method, and solved using the Newmark-β method. The analysis explores how coupling torsional stiffness influences natural and vibration characteristics, while examining the effects of propeller eccentricity and misalignment magnitudes. Results show that coupled faults generate multiple combination frequencies of transverse natural and excitation frequencies in torsional vibration, leading to first-order resonance. Furthermore, varying eccentricity and misalignment alters the natural frequency and vibration response, highlighting the significant impact of fault interaction on propulsion shafting dynamics.</p>

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Transverse-torsional coupled vibration of ship propulsion shafting under the coupled fault of coupling misalignment and propeller imbalance

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Qian Zhao,
  • Hekun Qin,
  • Xu Chen,
  • Jing Yuan,
  • Huiming Jiang

摘要

The propulsion shafting of ships is prone to multi-fault coupled vibrations, causing abnormal deformation or fracture. Among these, coupling misalignment and propeller imbalance often induce transverse-torsional coupling vibration, yet most studies address them separately. This paper investigates their synergistic effects by establishing mechanical models that incorporate torsional vibration through geometric force analysis. A transverse-torsional coupled dynamics model is derived via the Lagrange equation and finite element method, and solved using the Newmark-β method. The analysis explores how coupling torsional stiffness influences natural and vibration characteristics, while examining the effects of propeller eccentricity and misalignment magnitudes. Results show that coupled faults generate multiple combination frequencies of transverse natural and excitation frequencies in torsional vibration, leading to first-order resonance. Furthermore, varying eccentricity and misalignment alters the natural frequency and vibration response, highlighting the significant impact of fault interaction on propulsion shafting dynamics.