基于威布尔分布的遇波谱参数化

Lariuss Zago, A. Kawano, A. Simos, Rodolfo T. Gonçalves
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引用次数: 1

摘要

从收集海洋学数据到规划船舶作业,对海况的持续监测对许多活动都很重要。有几种方法可以推断海况,准确度各不相同。其中,基于船载运动测量的方法受到了许多研究者的关注,主要是由于其在安装和维护问题上的实用性。然而,使用船只作为波浪传感器的想法也带来了限制,主要与短波的过滤有关,这些短波不会引起船体的明显运动,此外,船只的速度在数学推理过程中引入了相当大的复杂性。这种复杂性的一个重要部分与与尾波条件有关的三值问题有关。在一项研究的背景下,研究了一种基于船舶前进速度的海浪参数估计的替代方法,本文讨论了在船舶参考坐标系中(即遇波谱)所看到的波浪能量分布的适当参数表示的问题。提出了一种威布尔分布参数化方法,因为它能够处理遇波谱形状的显著变化。对波浪方向、峰值频率和船舶速度的几种组合进行的分析表明,这种方法确实能够根据几个参数,为艏波和尾波提供正确的频谱形状表示。
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A Weibull Distribution-Based Parametrization for Encounter Wave Spectra
The continuous monitoring of sea states is important for many activities, from gathering oceanographic data to the planning of ship operations. There are several means to infer sea conditions, with variable levels of accuracy. Among these, the methods based on on-board measurements of vessel motions have been addressed by many researchers, attracted mainly by its practicality regarding installation and maintenance issues. However, the idea of using vessels as wave sensor also brings restrictions, mainly associated with the filtering of short waves that causes no significant motions of the hull, and, furthermore, the vessel speed introduces considerable complexity in the mathematical inference procedure. A significant part of this complexity is associated with the triple-value problem related to stern wave conditions. In the context of a research that addresses an alternative method for the parametric estimation of sea waves based on vessels with forward speed, this article deals with the problem of devising a proper parametric representation of the wave energy distribution as seen in the ship’s reference frame, i.e., the encounter wave spectrum. A Weibull-distribution parametrization is proposed, for its ability to handle the significant variations of encounter wave spectrum shapes. Analyses performed for several combinations of wave directions, peak frequencies and vessel’s speed show that this approach is indeed capable of providing proper representation of the spectral shapes based on few parameters, both for bow and stern waves.
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