A new method for the generation of second-order random waves |
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Authors: | Peter Jan van Leeuwen Gert Klopman |
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Institution: | aFaculty of Civil Engineering, Technical University Delft, Stevinweg 1, 2628 CN Delft, The Netherlands;bDelft Hydraulics, P.O. Box 152, 8300 AD Emmeloord, The Netherlands |
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Abstract: | In order to prevent the generation of spurious free sub- and superharmonics of random waves in a laboratory channel, the control signal for the wave board has to be derived according to a higher-order wave theory. An expression for this control signal has been derived with the perturbation method of multiple scales. It is much less complex and requires less computation time than the expressions obtained from the full second-order theory. The new method for second-order subharmonics was verified experimentally for waves with bichromatic and continuous first-order spectra. The data were analysed with the complex-harmonic principal-component analysis to reduce the influence of noise. |
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