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separation of waves by Interpolation Method

海洋工程：英文版 2003年第1期17卷 123-132页

作者：孙鹤泉王永学 State Key Laboratory of Coastal and Offshore Engineering

The separation of waves by an interpolation method is presented in detail. The composite wave sequences measured with two wave gauges in the wave flume are separated very quickly into two series of incident and reflected waves in time domain via the simple interpolation and difference operations. Then, the reflection coefficient can be estimated easily and accurately without calculation of wave heights and phases. The intial phase of reflection can also be detected easily for improvement of the accuracy of calculation. The present method is applicable to both regular and irregular trains of waves based on the linear wave theory which are proved to be accurate through numerical sample tests. Physical experiments are conducted and compared with Goda′s method and analytical method with satisfactory results. Furthermore, the present method can be used for the absorbing wave maker to extract reflected waves in real time.

关键词： separation of waves reflection coefficient interpolation difference operation

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Hilbert Transferin Applied to separation of waves

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China Ocean Engineering 2002年第2期17卷 239-248页

作者： SUN Hequan(孙鹤泉) WANG Yongxue(王永学) PENG Jingping(彭静萍) State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China

The analytical method (AM) for separation of composite waves is presented based on the Hilbert transform. It is applicable to both regular and irregular trains; of waves. The wave data series measured with two wave gauges in the experiments are separated into two series of incident and reflected waves. Then, the reflection coefficient can be easily obtained. The arrival of reflected waves can also be detected for improvement of the accuracy of the reflection coefficient. The reflection performance of the physical model can be estimated exactly without calculation of wave height and phase difference. Numerical samples developed to test the method are proved to be accurate. Physical experiments are conducted and compared with Goda's method and satisfactory results are obtained.

关键词： reflection coefficient Hilbert transform fast Fourier transform separation of waves

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The application of Hartley transform to ocean engineering

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Acta Oceanologica Sinica 2003年第3期22卷 483-490页

作者： Hequan Sun, Dahong Qiu, Yongxue Wang State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, China + Corresponding author: Fax: +86-411-4708526, E-mail:hqsun@dlut. *** Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian 116023 Peoples R China

The Hartley transform is a real integral transform based on harmonic functions and has some characteristics similar to the Fourier transform. Most applications in ocean engineering requiring the Fourier transform can also be performed by the Hartley transform. The fast Hartley transform is twice faster and more convenient to handle than the corresponding fast Fourier transform, so it is a real valued alternative to the complex Fourier transform in many applications. The use of the Hartley transform in ocean engineering is presented in detail in this paper, including wave spectral analysis, separation of waves, cross-correlation in PIV technique and expression of equation in the Hartley domain. The examples in the paper show deeply the advantage and efficiency of the Hartley transform over the Fourier transform.

关键词： Hartley transform Fourier transform ocean engineering separation of waves PIV

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