... Estimation with Neural Networks: A Numerical Study from Data of a Spread-Moored FPSO Gustavo A. Bisinotto, Fabio G. Cozman and Eduardo A. Tannuri Escola Polite´cnica, Universidade de Sa o Paulo Sa o Paulo, SP, Brazil ABSTRACT This paper employs neural networks to propose an estimation model for surface...

..., Melbourne, FL, USA 3Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, South Korea ABSTRACT This study investigates a method of estimating wave fields in space using stereo images from cameras mounted on moving ships. The investigation was conducted entirely...

... state by merging the prior estimates from physics-based models with measurements from onboard sensors. However, many KF-based estimates are calculated by assuming constant system and measurement uncertainties during the iterative process. In this study, an adaptive tuning mechanism in the KF-based...

... modelling/reanalysis uncertainties can impact the reliability of wave energy resource estimations within the operational and extreme realm, leading to suboptimal site selection where the actual energy yield does not meet expectations (Mackay et al., 2010). Furthermore, reanalysis uncertainties complicate...

... in deep sea drilling operations. geologist reservoir geomechanics deformation drill pipe selection fluctuation vector wob fluctuation suzuki drillstring design consideration ancf matrix estimation nodal coordinate formulation numerical study geology effect geological subdiscipline...

... estimation method is used to solve the probability density curve of the predicted points, which further verifies the reliability of the proposed model. In conclusion, the proposed QR-GRU model stands out as a robust and effective approach for short-term motion prediction of semi-submersible platforms...

... ABSTRACT The determination of an accurate manoeuvring model is essential for improving the performance of a vessel and estimate its behaviour at sea. However, there is no simple relation to build it and conventional approaches are too expensive and time consuming to be used during the design...

... with bilge keels on ship models proposed a prediction method for the estimation of the pressure component of bilge keel damping. Ikeda (1983) presented the requirement to associate roll damping with the appropriate nonlinear attributes, especially when nonlinear roll under random seas is the problem at hand...

... ABSTRACT In statistical risk analysis, estimation of return levels is often of importance. In particular, the uncertainties of the estimates are crucial. The longer the return period, the more uncertain is the estimate of the return level, or phrased in terms of statistical modeling...

.... 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...

... 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...

... 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...

... 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...

... pressure distribution wavelength panel method rankine panel method long wavelength marine transportation input point impulse response function experiment kashiwagi ord response function estimation pressure data unsteady pressure distribution experimental result diffraction...

... ABSTRACT This paper presents a depth inversion approach that uses a direct estimation of the wave period and wavelength locally in space from radar images. The wave periods are retrieved by time-signals analysis at several points. The wavelengths are directly measured from the distance...

... ABSTRACT The seakeeping of a ship is estimated precisely at design time. However, its reliability has declined with the enlargement of the ship's hull. Also, computing the performance comprehensively under all operating conditions is unrealistic. Therefore, it is practical to estimate...

... 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...