The least square error (LSE) method is frequently used in determination of Morison’s coefficients from the analysis of measured wave forces on circular cylinders. It will be proved in this paper that Morison’s coefficients determined from the LSE method always lead to predicted forces which have smaller variances (2nd-order statistical moments) than those of the measured forces. In other words, it is proved that predicted forces from this method are of lower intensity compared to the measured forces, and hence can be unconservative. A new method, termed the maximum correlation (MC) method, has been introduced. This method has all the advantages of the LSE method, but leads to predicted forces whose variances are equal to those of the measured forces.
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February 1994
Research Papers
Critical Assessment of the Least Square Error Method Used in Derivation of Morison’s Force Coefficients
G. Najafian,
G. Najafian
Department of Civil Engineering, University of Liverpool, Liverpool L69 3BX, U.K.
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R. Burrows
R. Burrows
Department of Civil Engineering, University of Liverpool, Liverpool L69 3BX, U.K.
Search for other works by this author on:
G. Najafian
Department of Civil Engineering, University of Liverpool, Liverpool L69 3BX, U.K.
R. Burrows
Department of Civil Engineering, University of Liverpool, Liverpool L69 3BX, U.K.
J. Offshore Mech. Arct. Eng. Feb 1994, 116(1): 1-6 (6 pages)
Published Online: February 1, 1994
Article history
Received:
August 16, 1993
Online:
June 12, 2008
Citation
Najafian, G., and Burrows, R. (February 1, 1994). "Critical Assessment of the Least Square Error Method Used in Derivation of Morison’s Force Coefficients." ASME. J. Offshore Mech. Arct. Eng. February 1994; 116(1): 1–6. https://doi.org/10.1115/1.2920122
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