摘要
研究Truss Spar平台在随机波浪下的垂荡运动特性。采用ITTC双参数谱,考虑绕射作用,数值计算了平台所受的随机波浪力。利用已有的水动力试验和数值模拟结果及Morison方程,估计了Truss Spar平台垂荡方向的附加质量和粘滞阻尼大小。考虑非线性阻尼和瞬时波面的影响,运用Runge-Kutta数值迭代算法,比较了不同随机波浪参数对平台运动响应的影响,特别是波浪特征周期接近垂荡固有周期时。结果表明,当波浪特征周期接近平台垂荡固有周期时,平台产生大幅垂荡运动,频域的运动分析结果比时域结果偏小。
The heave motion characteristics of Truss Spar in random seas are studied. Applying ITTC two-parameter wave spectrum, the random wave force of Truss Spar is numerically simulated considering diffraction effect. Using the results of hydrodynamic experiments and numerical simulation from former investigations, the added mass and viscous damping of Truss Spar are estimated. The motion equation is established considering the nonlinear damping and transient wave surface. Different random wave parameters on the response of the Truss Spar motion are analyzed by Runge-Kutta iterative algorithm, especially when the wave characteristic period is close to the heave natural period. The results show that the amplitude of heave is increasing significantly when the wave characteristic period is close to the heave natural period. And the results of time domain analysis are larger than the ones of frequency domain analysis.
出处
《海洋工程》
CSCD
北大核心
2012年第1期60-65,91,共7页
The Ocean Engineering
基金
国家自然科学基金资助项目(50879057
51079097)
