Integrated Vessel Motion And Mooring Analysis Applied In Hybrid Model Testing
Integrated Vessel Motion And Mooring Analysis Applied In Hybrid Model Testing
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发表时间：
1999
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通讯作者：
H. Ormberg;C. Stansberg;R. Yttervik;G. Kleiven
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作者：
H. Ormberg;C. Stansberg;R. Yttervik;G. Kleiven
描述了一种用于系泊船舶耦合数值分析的计算机程序系统，其中船舶被集成为完整系泊/立管系统的有限元模型的一部分。这给出了船舶运动和线路动力学之间的适当的时域相互作用关系。该程序的实验验证进行了详细的数值重建的时间序列模型试验与半潜式。通过使用经验漂移力估计的测试，重建比较好的测量，而标准势理论显着低估慢漂移在大浪。然后，该程序应用于混合模型试验技术的调查，简化的测试，减少深度重建和外推数值。通过在减小深度的模型试验中再现几乎真实的悬链线，可以通过在该深度处的重建来校准数值模型，并且校准的参数保持在外推模拟中。全深度模型试验的比较表明，数值外推的慢漂移和线张力的工作相当不错，虽然线动态略有低估。
A computer program system for coupled numerical analysis of moored vessels is described, where the vessel is integrated as a part of a finite element model of the complete mooring/riser system. This gives a proper time-domain interaction relationship between the vessel motions and the line dynamics. Experimental verification of the program is carried out by detailed numerical reconstructions of time series from model tests with a semisubmersible. By use of empirical drift forces estimated from the tests, the reconstructions compare well with the measurements, while standard potential theory significantly underestimates slow-drift in large waves. The program is then applied in an investigation on a hybrid model testing technique, where simplified tests in reduced depth are reconstructed and extrapolated numerically. By reproducing almost realistic catenary lines in the reduced depth model tests, one can calibrate the numerical model by the reconstruction at this depth, and calibrated parameters are kept in the extrapolated simulations. Comparisons to full-depth model tests show that the numerical extrapolations of slow-drift and line tension work reasonably well, although the line dynamics are slightly underestimated.