The second-order decomposition model of nonlinear irregular waves

Zhi Wen Yang, Harry B. Bingham, Jin Xuan Li, Shu Xue Liu

    Research output: Contribution to journalJournal articleResearchpeer-review


    A new method to decompose the nonlinear irregular waves is proposed. The second-order potential flow theory is employed to construct the relation of the second-order items solution by deriving the transfer function between the first- and the second-order components. Target waves are decomposed into the first- and the second-order super-harmonic as well as the second-order sub-harmonic components by transferring them into an identical Fourier frequency-space and using a Newton-Raphson iteration method. In order to evaluate the present model, a variety of monochromatic waves and the second-order nonlinear irregular waves over a broad range of frequencies have been analyzed, and the effects on wave nonlinearity are analyzed. The experimental results show that the present method is reasonably effective for the wave decomposition.
    Original languageEnglish
    JournalDalian Ligong Daxue Xuebao (Shehui Kexue Ban)
    Issue number6
    Pages (from-to)871-878
    Number of pages8
    Publication statusPublished - 2013


    • Newton-Raphson iteration
    • Nonlinear irregular waves
    • The second-order decomposition


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