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首页> 外文期刊>Ocean Engineering >Estimating on-site wave spectra from the motions of a semi-submersible platform: An assessment based on model scale results
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Estimating on-site wave spectra from the motions of a semi-submersible platform: An assessment based on model scale results

机译：从半潜水平台的运动估算现场波谱：基于模型比例结果的评估

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This article presents the results of a preliminary investigation on the use of the motions of a large-volume semi submersible platform as the basis for estimating waves on-site. The main focus of the application is on the harsher wave conditions, for which other measurement devices are known to present limitations. As a first step in this investigation, a series of tests were performed with a scaled model in a wave basin. A wide range of waves was tested in order to evaluate how the estimation errors behave with respect to wave period and amplitude. Moreover, since the statistical inference relies on a linear dynamic model, the influence of uncertainties on the unit's RAOs must be assessed. Since the non-linear viscous effect on resonant responses is known to be one of the main sources of error in this regard, different approaches for predefining the viscous damping levels are tested and compared. The results attest that, at least in the controlled conditions of the tests, the inference method is able to provide accurate estimations of the extreme waves conditions that were tested. A simple method for predicting the damping based on the recorded motions is shown to improve the estimations.
机译：本文介绍了使用大型半潜式平台的运动作为现场估算波的基础的初步调查结果。该应用程序的主要重点是在恶劣的波浪条件下，已知其他测量设备会遇到这种情况。作为这项研究的第一步，在水盆中使用比例模型进行了一系列测试。为了评估估计误差相对于波周期和振幅的行为，测试了各种波。此外，由于统计推断依赖于线性动态模型，因此必须评估不确定性对设备RAO的影响。由于已知在谐振响应上的非线性粘滞效应是这方面误差的主要来源之一，因此测试和比较了用于预先确定粘滞阻尼水平的不同方法。结果证明，至少在测试的受控条件下，推理方法能够对所测试的极端波浪条件提供准确的估计。示出了一种基于记录的运动来预测阻尼的简单方法，以改善估计。

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