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Evaluation of the effect of contact between risers and guide frames on offshore spar platform motions.

机译：评估立管和导向架之间的接触对海上翼梁平台运动的影响。

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摘要

A computer program is developed for the dynamic analysis of a spar platform coupled with mooring lines and risers in waves, winds, and currents. The new multi-contact analysis program is developed for the nonlinear multi-contact coupling between vertical risers and guide frames inside of the spar moon-pool. The program extends capability of the current coupled dynamic analysis program, WINPOST, by adding the capability of analyzing riser effects caused by the contact forces and moments from buoyancy-cans inside the spar moon-pool on the global spar motions. The gap between the buoyancy can and riser guide frames are modeled using three different types of nonlinear gap springs. The new riser model also considers the Coulomb damping between the buoyancy-cans and riser guide frames, and it also calculates the impact force on risers for use in fatigue analysis.; The spar platform generally uses vertical risers with dry trees. However, as the water depth increases, the size of the buoyancy-can increases, and it makes installation more difficult. The pneumatic riser support system does not use buoyancy-cans and is an alternative solution to the buoyancy-can approach. The dynamic characteristics of pneumatic riser support system are studied by using the newly developed numerical analysis program.; The damped Mathieu instability diagram for the damped Mathieu's equation is developed. Due to spar heave and pitch coupling, Mathieu's instability may become excited in long period waves. In the numerical analysis program, pitch and roll hydrostatic stiffness are recalculated for heave motion in every time step to check Mathieu's instability for the spar platform. Simplified vortex-induced vibration effects on the spar platform are considered in newly developed numerical analysis program, and the results are systematically compared with those of the original program WINPOST.; The results in this paper show that the buoyancy-can effect significantly reduces the spar pitch motion, and the Coulomb damping effect also significantly reduces the spar heave motion. The buoyancy-can effect also plays an important role in Mathieu instability. The results also show that a pneumatic riser support system increases the spar heave motion and payload.
机译：开发了用于对梁，平台，波浪，风和洋流中的锚索和立管进行动力分析的计算机程序。新的多触点分析程序是针对翼梁月池内部垂直立管和导向框架之间的非线性多触点耦合而开发的。该程序通过增加分析由接触力和梁柱月球池内浮力罐的力矩引起的立管效应的能力，扩展了当前耦合动态分析程序WINPOST的能力，这些作用是由于梁柱月球池整体运动引起的。使用三种不同类型的非线性间隙弹簧对浮力罐和立管导向框架之间的间隙进行建模。新的立管模型还考虑了浮力罐和立管导向框架之间的库仑阻尼，并且还计算了对立管的冲击力，以进行疲劳分析。翼梁平台通常使用带有枯树的垂直立管。然而，随着水深的增加，浮力罐的尺寸增加，这使得安装更加困难。气动立管支撑系统不使用浮力罐，是浮力罐方法的替代解决方案。使用最新开发的数值分析程序研究了气动立管支撑系统的动态特性。建立了阻尼Mathieu方程的阻尼Mathieu不稳定性图。由于翼梁的起伏和俯仰耦合，Mathieu的不稳定性可能会在长波中被激发。在数值分析程序中，重新计算俯仰和横摇静水刚度，以便在每个时间步中进行升沉运动，以检查Mathieu对于翼梁平台的不稳定性。新开发的数值分析程序考虑了简化的涡流对翼梁平台的振动影响，并将结果与​​原始程序WINPOST进行了系统比较。结果表明，浮力作用可以显着降低翼梁的俯仰运动，而库仑阻尼效应也​​可以显着降低翼梁的升沉运动。浮力效应在Mathieu的不稳定性中也起着重要作用。结果还表明，气动立管支撑系统可增加翼梁的起伏运动和有效载荷。

著录项

  • 作者

    Koo, Bon-Jun.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Engineering Marine and Ocean.; Engineering Civil.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 244 p.
  • 总页数 244
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋工程;建筑科学;
  • 关键词

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