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首页> 外文会议>20th International Conference on Offshore Mechanics and Arctic Engineering Vol.1: Offshore Technology, 20th, Jun 3-8, 2001, Rio de Janeiro, Brazil >HEAVE MOTION CHARACTERISTICS OF SPAR PLATFORM WITH ALTERNATIVE HULL SHAPES
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HEAVE MOTION CHARACTERISTICS OF SPAR PLATFORM WITH ALTERNATIVE HULL SHAPES

机译：具有交替船体形状的SPAR平台的波动特性

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摘要

Spar platforms with cylindrical shape and constant cross section area may experience resonant heave motions in sea states with long peak periods, which are probably excessive for riser integrity due to its low damping and relatively low natural heave period. Changes to hull shape and cross-section that produce more benign heave behaviour were discussed by some researchers in the past. The heave resonant response may be reduced by several means: (1) increasing the damping of the system, (2) the natural heave period kept outside the range of the wave energy, and (3) further reducing the linear heave excitation forces. Conventional offshore hydrodynamic analysis considers a structure in waves, and evaluates the linear and nonlinear loads using potential theory. Viscous damping, which is expected to play crucial role in the resonant response, is an empirical input to the analysis, and is not explicitly calculated. In this paper, the coupled responses of the configurations of several alternative hull shapes of the spar are investigated in frequency domain. An iterative post-processing procedure is applied to incorporate nonlinear viscous effects into the potential solutions. Compared to the classical spar, the spars with the alternative hull shapes are all found to effectively shift the peak heave RAOs outside the range of the wave frequencies in the ocean, and consequently reduce the resonant heave motions through all the above three means. The calculations also reveal that the resonant heave motions are further suppressed by the viscous effects.
机译：具有圆柱形形状和恒定横截面面积的翼梁平台在高峰期较长的海况下可能会发生共振升沉运动，由于其低阻尼和相对较低的自然升沉周期，这对于立管完整性而言可能是过度的。过去，一些研究人员讨论了船体形状和横截面的变化会产生更好的升沉行为。升沉的共振响应可以通过几种方式降低：（1）增加系统的阻尼，（2）保持在波能范围之外的自然升沉周期，以及（3）进一步减小线性升沉激励力。常规的海上水动力分析考虑波浪结构，并使用势能理论评估线性和非线性载荷。粘滞阻尼在共振响应中起着至关重要的作用，它是分析的经验输入，并未明确计算。在本文中，在频域中研究了翼梁的几种可选船体形状的配置的耦合响应。应用迭代后处理程序将非线性粘性效应合并到潜在解决方案中。与经典翼梁相比，具有其他船体形状的翼梁都可以有效地将峰值升沉RAO移到海洋中的波频率范围之外，从而通过上述所有三种方式降低了共振升沉运动。该计算还表明，粘性影响进一步抑制了共振升沉运动。

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