... ABSTRACT Estimation of so-called return values of environmental extremes, of importance in e.g. ocean and coastal engineering, is a challenging problem. Several approaches have been suggested in the literature. In this work, we examine closer a natural extension of the classical approach...

... in such tests, different methods for estimation of the directional wave spectra may be applied. However, different assumptions are imposed in the methods and deviations here from provide uncertainties in the results. The following paper quantifies the influence of nonlinear effects on the accuracy...

.... In this study, a state-of-the-art Kalman Filter (KF) framework aided by a Finite Element (FE) analysis is employed for nonlinear state estimation and, consequently, structural damage identification of an offshore steel jacket structure subjected to unknown extreme wave loads. The outcome of this approach...

... tremendously aid real time navigational adjustments to avoid dangerous situations the vessel can encounter. This study was undertaken to estimate the position of the centre of gravity from the full-scale vessel wave induced motions recorded from inertial measurement units. Results showed that the adopted...

... ABSTRACT This study proposes an artificial neural network (ANN) model to inversely estimate sea states from the motion signals of floating structures measured on board. A generic moored FPSO (floating production storage and offloading) is modeled and 6DOF-motion time-series data are generated...

... techniques have been explored and developed in recent decades. Nielsen (2006) outlined the theory to estimate directional wave spectrum based on ship response measurements. Two methods were introduced. The first is a parametric method, which assumes the wave spectrum is composed by parameterized wave...

... to know where receives significant drag force. However, it is not realistic for actual ships to obtain the pressure distribution by using numerous sensors. Therefore, we develop a method to estimate pressure distribution on the ship hull by using pressure data measured at one position. The pressure...

... estimation dataset glagah beach nearshore bathymetry estimation wavelength actual depth water depth radar image experiment depth estimation estimation result wave period bathymetry dispersion relation west java ABSTRACT This paper presents a depth inversion approach...

... Modeling By A Self-Organizing State-Space Model With Measured Data Takaaki Hanaki1 and Munehiko Minoura1 1Department of Naval Architecture and Ocean Engineering, Osaka University, Osaka, Japan ABSTRACT The seakeeping of a ship is estimated precisely at design time. However, its reliability has declined...

... ABSTRACT Within the Joint Research Project RetroLadung, weight-optimized cell guides with integrated motion sensors and data-driven decision support systems (DSS) are developed. A basic functionality of the DSS is the estimation of sea states based on measurement data from acceleration sensors...

... speed motion are of interest in relation to the simulation of the propeller-engine interaction. The estimation of the associated fuel consumption and of the time the ship to reach a certain speed or to come to full stop becomes important, along with the estimation stopping distance (see, e.g., Mizythras...

... estimate shape-form of air cushion vehicle (ACV) skirt under abnormal state, and relative program was developed in AutoCAD by Visual LISP. The shape-form of different type skirt sect profile at bow, side or stern of ACV could be reached quickly, which agreed with those got by FEM analysis method in Abaqus...

... Abstract The vessel state and parameter estimation is essential to ship maneuvering and collision avoidance. This study presents an application of a particle filter algorithm to estimate vessel states and parameters. Particularly, to capture the impact of the vessel underactuated property...

... model tank experiment water tank midstream oil & gas calculation hydrodynamic force displacement tsunami wave oil storage tank estimation solid region fsi analysis tsunami inundation upstream oil & gas simulation time development solver equation tank Proceedings...

... have full hull lines with vertical sides extending over the entire hull entrance or even bulbous bows. Such vessels may have an ice class up to Arc7. The hydrodynamic model does not provide sufficiently simple analytical relations for class rules to estimate impact ice loads on vertical sides in way...

...ABSTRACT ABSTRACT In this study, the estimation of the asymmetric factor for a semisubmersible platform based on linear analysis is conducted. The asymmetric factor is defined as the ratio of nonlinear wave elevation to linear wave elevation. Estimation is performed according to the simplified...

... ABSTRACT In this paper, a decision support tool for collision avoidance is presented. The collision probability of the investigated container vessel is estimated using a 3-step approach. In this methodology, the manoeuvrability and the propulsion system performance of the own vessel is taken...

... ABSTRACT Structural monitoring is increasingly becoming everyday business in the offshore industry. The monitoring may target the strain estimation or focus on tracking the changes in the dynamic properties of the structure in order to predict damages at remote / or possibly subsea locations...

.... Regarding the extreme parameters estimation, four fundamental extreme value distribution functions, namely, Gumbel, Weibull, generalized extreme value and Pearson type III distributions are selected to obtain different return values of ice velocity and thickness. All functions have passed the K-S test...

... and the life of the seafastening structure. In this study, the number of environmental cases for the analysis is 14 and each case is analyzed to estimate each fatigue damage. And these damages of seafastening structures in each case are summed and fatigue life is obtained from the total fatigue damage. Because...