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Nonlinearity of abnormal waves by the Hilbert-Huang Transform method

机译:基于希尔伯特-黄变换方法的异常波非线性

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The nonlinearity of full-scale abnormal wave data is studied by the Hilbert-Huang Transform method. The vertical asymmetry of abnormal waves is examined in relation to the level of the intra-wave frequency modulation of different Intrinsic Mode Functions. The Draupner New Year wave data time series is used as an example of a vertically asymmetric abnormal wave, while record 37 from the hurricane Camille dataset is chosen as an example of a vertically symmetric abnormal wave. A measure of intrawave frequency modulation is proposed based on the instantaneous frequency variations within one single wave. The study of the variation of local frequency in the vicinity of abnormal waves demonstrates that a larger intra-wave frequency modulation is associated with a higher asymmetry of the wave profile. (C) 2016 Elsevier Ltd. All rights reserved.
机译:通过希尔伯特-黄变换方法研究了满量程异常波数据的非线性。相对于不同本征函数的波内频率调制水平,检查了异常波的垂直不对称性。 Draupner新年波数据时间序列用作垂直非对称异常波的示例,而飓风Camille数据集的记录37被选择为垂直对称异常波的示例。提出了一种基于单波内瞬时频率变化的波内频率调制方法。对异常波附近的局部频率变化的研究表明,较大的波内频率调制与较高的波剖面不对称性有关。 (C)2016 Elsevier Ltd.保留所有权利。

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