... al., 2009), are tried to be established in Japan. Simple and accurate methods for estimating the directional wave spectrum around the ship are needed to evaluate the actual fuel efficiency and to develop the navigation guidance systems. Several on-board guidance systems have been developed...

... the greatest barrier is to accurately estimate the Doppler spectra. Several methods have been developed to estimate directional wave spectrum (Lipa and Barick, 1986; Wyatt, 1990; Howell and Walsh, 1993; and Hisaki, 1996), with some advantages and limitations. Nevertheless, the majority of them are yet unable...

... In recent years significant research efforts have been dedicated to evaluate the possibility of estimating directional wave spectrum by monitoring vessel motions. In previous papers the authors addressed the problem of estimating the sea spectrum from stationary FPSO units as an alternative...

..., and prediction of future ship response using estimated directional wave spectrum. Thus, mariners can obtain future information about ship response before deciding to change course or speed. In these procedures, the assumption of stationary stochastic processes is applied to the seaway, but not to ship response...

... significant value wave direction structural strain breakwater directional wave spectrum hydrodynamic force wave period hydroelastic response Proceedings of The Twelfth (2002) International Offshore and Polar Engineering Conference Kitakyushu, Japan, May 26-31, 2002 Copyright 0 2002...

... of angle in basin REPRODlJCED WAVE AND CURRENT The reproducibility of directional wave basin should be represented in the profiles of reproduced directional wave spectrum. For the case of multi-face directional random wave generator, the spectrum of directional wave with the principal direction from one...

... the stochastic viewpoint. Using the estimated directional wave spectrum, it is shown that the future states of ship motions and longitudinal bending stresses can be evaluated based on the assumption of linear responses. In order to examine the reliability of the proposed method, on board experiments were carried...

... full scale measurement vertical resonant motion standard deviation snorre tlp time sene spectrum frequency wave spectrum spectra platform directional wave spectrum model test sene seastate calculation tether tension response spectrum ABSTRACT Measurements of platform...

.... It is numerically confirmed that the use of the maximum likelihood estimates, instead of the corresponding averaged sample spectra, improves the estimate of the directional wave spectrum. Keywords Directional wave spectrum, heave-pitch-roll time series, Wis- hart distribution, sample spectra probability...