Higher-harmonic focused-wave forces on a vertical cylinder


Ma, Y., Dong, G., Perlin, M., Liu, S., Zang, J. and Sun, Y., 2009. Higher-harmonic focused-wave forces on a vertical cylinder. Ocean Engineering, 36 (8), pp. 595-604.

Related documents:

This repository does not currently have the full-text of this item.
You may be able to access a copy if URLs are provided below. (Contact Author)

Official URL:

Related URLs:


This paper considers higher-harmonic forces due to wave focusing on a vertical circular cylinder. A series of experiments has been conducted in a wave flume. The first six-harmonic components of the measured wave forces are analyzed using the scale-averaged wavelet spectrum. It is noted that due to the transient nature of focused (freak) waves, Fourier analysis would not provide equivalent information to that gleaned from the analyses used herein. The results for the experiments with very steep wave crests show significant amplitudes at the fourth and fifth harmonics. These harmonics exhibit amplitudes that are the same order as the second harmonic, but much larger than those of the third harmonic. The wavelet-based bicoherence is used to detect the quadratic nonlinearity of the measured forces. And the bicoherence spectra reveal the primary mathematical reason for the existence of the striking amplitudes of the fourth and fifth harmonics: the interaction between the lower-harmonic components couple more strongly with the fourth and fifth harmonics, thus the fourth and fifth harmonics glean more energy than those of the third-harmonic components. However, the physical explanation for this remains elusive.


Item Type Articles
CreatorsMa, Y., Dong, G., Perlin, M., Liu, S., Zang, J. and Sun, Y.
Related URLs
Uncontrolled Keywordswave transformation,vertical cylinder,wavelet-based bicoherence,scale-averaged wavelet energy,higher-harmonic forces,nonlinear interactions
DepartmentsFaculty of Engineering & Design > Architecture & Civil Engineering
ID Code14788


Actions (login required)

View Item