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Analysis of wave groups by wave envelope-phase and the Hilbert Huang transform methods
https://orcid.org/0000-0002-8570-4263
Highlights The group structure of records, containing abnormal waves, is studied by the non-stationary HHT method. The envelope, phase and frequency, define the local wave instantaneous characteristics. A refined definition of wave group is proposed considering that waves are amplitude and phase modulated. The Hilbert spectrum is used as a detector of wave groups and group length and energy are determined. It was found that the symmetrical abnormal waves appear in records with pronounced groupiness.
Abstract The wave groups are studied by both conventional wave analysis methods and by the non-stationary Hilbert Huang Transform (HHT) method. Full-scale wave records containing abnormal waves are used. Instantaneous quantities, such as envelope, phase and frequency, are adopted to study the wave grouping. A refined definition of wave group is proposed considering that the wave process is simultaneously amplitude and frequency modulated. The validation of the proposed definition is conducted by analysis of numerical simulation data. Group parameters are proposed based on the time-frequency distribution of energy. An attempt is made to find the relationship between the characteristics of abnormal waves and the group characteristics.
Analysis of wave groups by wave envelope-phase and the Hilbert Huang transform methods
https://orcid.org/0000-0002-8570-4263
Highlights The group structure of records, containing abnormal waves, is studied by the non-stationary HHT method. The envelope, phase and frequency, define the local wave instantaneous characteristics. A refined definition of wave group is proposed considering that waves are amplitude and phase modulated. The Hilbert spectrum is used as a detector of wave groups and group length and energy are determined. It was found that the symmetrical abnormal waves appear in records with pronounced groupiness.
Abstract The wave groups are studied by both conventional wave analysis methods and by the non-stationary Hilbert Huang Transform (HHT) method. Full-scale wave records containing abnormal waves are used. Instantaneous quantities, such as envelope, phase and frequency, are adopted to study the wave grouping. A refined definition of wave group is proposed considering that the wave process is simultaneously amplitude and frequency modulated. The validation of the proposed definition is conducted by analysis of numerical simulation data. Group parameters are proposed based on the time-frequency distribution of energy. An attempt is made to find the relationship between the characteristics of abnormal waves and the group characteristics.
Analysis of wave groups by wave envelope-phase and the Hilbert Huang transform methods
https://orcid.org/0000-0002-8570-4263
Highlights The group structure of records, containing abnormal waves, is studied by the non-stationary HHT method. The envelope, phase and frequency, define the local wave instantaneous characteristics. A refined definition of wave group is proposed considering that waves are amplitude and phase modulated. The Hilbert spectrum is used as a detector of wave groups and group length and energy are determined. It was found that the symmetrical abnormal waves appear in records with pronounced groupiness.
Abstract The wave groups are studied by both conventional wave analysis methods and by the non-stationary Hilbert Huang Transform (HHT) method. Full-scale wave records containing abnormal waves are used. Instantaneous quantities, such as envelope, phase and frequency, are adopted to study the wave grouping. A refined definition of wave group is proposed considering that the wave process is simultaneously amplitude and frequency modulated. The validation of the proposed definition is conducted by analysis of numerical simulation data. Group parameters are proposed based on the time-frequency distribution of energy. An attempt is made to find the relationship between the characteristics of abnormal waves and the group characteristics.
Analysis of wave groups by wave envelope-phase and the Hilbert Huang transform methods
Veltcheva, Albena (author) / Guedes Soares, C. (author)
Applied Ocean Research ; 60 ; 176-184
2016-09-22
9 pages
Article (Journal)
Electronic Resource
English
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