%P 53-66
%T Identification of transfer functions from surge motion response of a semisubmersible platform using time-varying NARX model
%V 54
%I Elsevier Ltd
%A E. Yazid
%A M.S. Liew
%A S. Parman
%A V.J. Kurian
%D 2016
%R 10.1016/j.apor.2015.11.001
%O cited By 3
%L scholars8012
%J Applied Ocean Research
%X Identification of transfer functions from surge motion response of a semisubmersible platform from model test data is presented in this paper. The identification is carried out by estimating the time-varying model coefficients of a time-varying NARX (TVNARX) model. The coefficients are estimated using proposed method, named artificial bee colony-based Kalman smoother (ABC-KS). System input-output data for identification process are wave height and surge motion from a scaled 1:100 model of a prototype semisubmersible. The applicability of proposed method is assessed numerically and experimentally under unidirectional long-crested random waves. The results show that the linear and quadratic frequency response functions as well as the wave and low frequency responses of a semisubmersible platform can be well identified either in time or frequency domains. The evolution of the nonlinear wave-structure interactions also can be revealed with respect to measured time duration. © 2015 Elsevier Ltd.
%K Frequency response; Optimization; Semisubmersibles, Artificial bee colonies; Frequency domains; Frequency response functions; Identification process; Input-output data; Low-frequency response; Surge motions; Time-varying models, Transfer functions, experimental study; numerical model; offshore application; random wave; semisubmersible platform; structural response; transfer function; wave-structure interaction, Apoidea