Please use this identifier to cite or link to this item: https://doi.org/10.1061/(ASCE)0733-9399(2004)130:3(294)
Title: Least-squares, moment-based, and hybrid polynomializations of drag forces
Authors: Liaw, C.Y. 
Zheng, X.Y. 
Keywords: Drag
Dynamic analysis
Excitation
Least-squares method
Offshore structures
Polynomials
Issue Date: Mar-2004
Source: Liaw, C.Y., Zheng, X.Y. (2004-03). Least-squares, moment-based, and hybrid polynomializations of drag forces. Journal of Engineering Mechanics 130 (3) : 294-302. ScholarBank@NUS Repository. https://doi.org/10.1061/(ASCE)0733-9399(2004)130:3(294)
Abstract: In order to carry out nonlinear dynamic analyses of fixed offshore structures in the frequency domain, polynomial approximations of the distributed drag term, u|u|, and inundation drag term, ηu|u|, of the Morison forces are studied. The methods of least-squares and moment-based approximations are considered for cases with and without current. Numerical results and analytical expressions of the polynomial coefficients are presented for the cubic approximations of u|u| and quartic approximations of ηu|u|. The curve shapes, first four central moments, and probability density functions of the different approximations are evaluated and compared with the corresponding exact solutions. For the nonmonotonic inundation drag term with the current effect included, a hybrid polynomialization, based on the least-squares approximation for the odd-order polynomial coefficients and the moment-based approximation for the even-order coefficients, is proposed. © ASCE / MARCH 2004.
Source Title: Journal of Engineering Mechanics
URI: http://scholarbank.nus.edu.sg/handle/10635/65760
ISSN: 07339399
DOI: 10.1061/(ASCE)0733-9399(2004)130:3(294)
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