4 Contributo in Atti di Convegno (Proceeding)

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Comparison of Linear and Rank-Correlation for the Sea State Estimation

To protect the marine environment and increase the safety of ships, knowledge of the state of the sea is crucial. In this study, sea state estimation was performed using an algorithm for unimodal and short-crested sea states, varying the linear and rank correlation coefficients accordingly. More specifically, Pear-son, Spearman and Kendall correlation coefficients are employed and compared to detect the best method in terms of accuracy and computational time. The results are encouraging when ...

Modelling Oil Spill and Dispersion at Sea from a Double Hull Oil Tanker Following Collision Events

Oil and its derivatives represent one of the primary energy sources today, making their transport essential for the global economy. Unfortunately, the risk of hydrocarbon spills into the sea is still significant. Our study analyzes the phases characterizing oil spills from oil tankers following collision events. We describe the evolutionary dynamics (tracer dispersion) of the oil slick and its potential environmental consequences in vulnerable regions of the Mediterranean Sea, using as an exa...

Validation of the Sea State Estimation Method Using a Simulated Ship Motions Dataset

Sea state estimation from ship motions is useful to increase the safety of the ship and navigation. In this study, an algorithm based on measured ship motions together with corresponding transfer functions is assessed. The algorithm, providing main wave parameters, is tested with simulated data. The main aim of the research is the validation of a wave spectrum assessment procedure for unimodal short-crested sea state conditions, based on the employment of the Spearman rank correlation coeffic...

Correlation of Collision Damage Statistical Properties by Gaussian Copula Functions

Oil spills from tankers decreased significantly in recent years, but they still occur. After a brief review about the methods and procedures implemented to prevent oil spills from tankers, the paper focuses on the statistical properties of oil spillage occurrences following collision events. Starting from the probability density functions provided by the IMO guidelines for longitudinal, transverse and vertical damage extents, the paper focuses on the employment of the Gaussian copula function...

Seismic design criteria for CFS steel-sheathed shear walls

The current European earthquake standard EN1998-1 does not provide the seismic design criteria for cold formed steel (CFS) steel-sheathed shear walls, limiting their use as a lateral force resisting system in lightweight steel buildings. In order to overcome this lack of guidelines, a specific study has been performed to extend the applicability of the Effective Strip Method (ESM), given in North American standard AISI S400 to EN1998-1. The method evaluates the shear resistance of steel-sheat...

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