... 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...

... europe government structural damage signal processing input-state estimation ymssp estimation kalman filter identification jacket structure joint input-state estimation denmark government wave load mechanical system matrix time step artificial intelligence displacement fe model...

... 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...

... 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...

... 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...

... 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...

... a storage tank model was solved with a finite element solver, and the field variables between the different regions were successfully exchanged without vast numerical cost. The developed simulation was applied to the problem for estimating tsunami and storage tank motion and the dependency of tank...

... and Parameter Estimation for Vessel Maneuvers Yufei Wang, Lokukaluge P. Perera, and Bjørn-Morten Batalden Department of Technology and Safety, UiT The Arctic University of Norway Tromsø, Norway ABSTRACT To ensure a safe and efficient ship navigation, an adequate level of situation awareness (SA) is required...

... 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...

... marine transportation xing-kaeding computational domain unsteady forward speed motion freight & logistics services displacement time history fast catamaran speed motion ship resistance coefficient estimation papanikolaou catamaran simulation unsteady resistance experiment...

... 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 of forebody...

... 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 method...

... ABSTRACT Structure-from-Motion is a technique for estimating 3D structures from 2D image. Due to different refractive index of mediums, the light ray will bend during the underwater imaging process, making the perspective camera model invalid. In this paper we set a camera fixed in a glass...

... tank storage hydrodynamic force oil storage tank upstream oil & gas tank experiment displacement tsunami wave estimation calculation fsi analysis simulation solid region stiffness simulation code tsunami midstream oil & gas oil spill decomposed approach equation...

... ABSTRACT When ships sailing at the ocean, six degrees of freedom of ship motions occur due to the sea waves. The wave-induced ship motions always bring adverse effects on carrying out maritime operations. Accurate real-time estimation of the deterministic ship motions is important for both...

... ABSTRACT In this study, a FIR filter based displacement estimation technique is proposed to estimate displacement from distributed strain sensors and an accelerometer. First, the neutral axis location of a structure is estimated from strain and acceleration measurements using recursive least...