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<p>The contact problem for laying the subsea pipeline as a nonlinear elastic rod was formulated and numerically solved. The influence of various factors was considered, including tension and shear of the pipeline, material nonlinearity of the material, the angle of fixation on the vessel, and the installation depth. A new accurate expression for hydrostatic load was derived and used in further calculations. For a specific pipeline, the optimal relationship between the fixation angle and the installation depth was found, ensuring the pipeline’s strength. The problem of free pipeline vibrations near the equilibrium during installation on the seabed was solved, and the natural frequencies were determined for pipeline installations at different depths. The vortex-induced vibrations of pipeline were considered, and the flow velocities were determined which significantly increase the amplitude of pipeline vibrations and potentially lead to pipeline failure.</p>

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Statics and dynamics of pipeline during installation by S-lay method

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • T. V. Zinovieva,
  • A. K. Belyaev

摘要

The contact problem for laying the subsea pipeline as a nonlinear elastic rod was formulated and numerically solved. The influence of various factors was considered, including tension and shear of the pipeline, material nonlinearity of the material, the angle of fixation on the vessel, and the installation depth. A new accurate expression for hydrostatic load was derived and used in further calculations. For a specific pipeline, the optimal relationship between the fixation angle and the installation depth was found, ensuring the pipeline’s strength. The problem of free pipeline vibrations near the equilibrium during installation on the seabed was solved, and the natural frequencies were determined for pipeline installations at different depths. The vortex-induced vibrations of pipeline were considered, and the flow velocities were determined which significantly increase the amplitude of pipeline vibrations and potentially lead to pipeline failure.