Data analysis methodologies for hydrodynamic experiments in waves

Authors

  • Mohammed Islam Oceanic Consulting Corporation
  • Fatima Jahra Fleetway Inc.
  • Scott Hiscock

DOI:

https://doi.org/10.3329/jname.v13i1.25347

Keywords:

Data Analysis, Wave Experiments, Wave Statistics, ZCA Analysis, RAO Analysis, Weibull Analysis

Abstract

This paper presents the methodologies developed in order to quality control and analyze the data acquired in hydrodynamic seakeeping experiments of physical models in waves. In such experiments, the data file consists of wave elevations and directions, loads, motions, velocities and accelerations of one or multiple bodies. Additionally, mooring, slamming, sea-fastening, fender and other vessel specific load data may be acquired, which requires special analysis technique. Data products of such experiments are primarily consist of the basic statistics of each of the acquired data channels selected segments. Various wave statistics are produced to estimate the significant and other percentile of peaks/troughs/heights of each relevant data signal. This is done for the wave segment using zero crossing analysis. The response amplitude operator analysis is done through spectral analysis. Weibull analysis is done to estimate the maximum and minimum of an occurrence in a projected time. Analysis routines are written to incorporate each of these analysis techniques to produce results both in tabular and graphical formats. Analysis technique for decay experiments in multiple directions of motion, which are integral parts of any sea-keeping experiments, is also presented. Examples of all such analysis are provided where appropriate.

Downloads

Download data is not yet available.
Abstract
1563
PDF
2146

Author Biography

Mohammed Islam, Oceanic Consulting Corporation

Director of Technical Solutions

References

Chakrabarti, S.K., 1994. Offshore Structure Modelling. World Scientific Publishing Co.

Earle, M.D., and Bishop, J.M., 1984, A Practical Guide to Ocean Wave Measurement and Analysis, Endeco Inc., Marion, MA.

Earle, M.D., Steele, K.E., and Hsu, Y.H.L., 1984, "Wave spectra corrections for measurements with hull-fixed accelerometers," Proceedings of OCEANS 84, IEEE, New York, NY, pp. 725-730.

Dean, R.G., and Dalrymple, R.A., 1984, Water Wave Mechanics for Engineers and Scientists, Prentice-Hall, Englewood Cliffs, NJ.

Donelan, M., and Pierson, W.J., 1983, "The sampling variability of estimates of spectra of wind generated gravity waves," Journal of Geophysical Research, vol. 88, pp. 4381-4392.

Kinsman, B., 1965, Wind Waves Their Generation and Propagation on the Ocean Surface, Prentice-Hall, Englewood Cliffs, NJ.

Longuet-Higgins, M.S., 1952, "On the statistical distribution of the heights of sea waves," Journal of Marine Research, vol. 11, pp. 245-266.

Longuet-Higgins, M.S., 1957, "The statistical analysis of a random moving surface," Proceedings of the Royal Society of London, 249A, pp. 321-387.

Longuet-Higgins, M.S., 1980, "On the distribution of the heights of sea waves: some effects of nonlinearity and finite band width," Journal of Geophysical Research, 85, pp. 1519-1523.

Welch, P.D., 1967, "The use of fast Fourier transform for the estimation of power spectra: a method based on time averaging over short, modified periodograms," IEEE Transactions on Audio and Electroacoustics, Vol. AU-15, p. 70-73. World Meteorological Organization, 1988, Manual on Codes, Vol. I, International Codes, FM 65-IX, WAVEOB, Geneva, Switzerland.

Downloads

Published

15.06.2016

How to Cite

Islam, M., Jahra, F., & Hiscock, S. (2016). Data analysis methodologies for hydrodynamic experiments in waves. Journal of Naval Architecture and Marine Engineering, 13(1), 1–15. https://doi.org/10.3329/jname.v13i1.25347

Issue

Section

Articles