• Research,

LHEEA's Mini-seminar 30/11/2017: "Study of the stochastic characteristics of the parametric roll", Julio Cesar Fernandez Polo

The LHEEA organizes mini-seminars every Thursday afternoon. The next seminar will be held in the distance-learning room on Thursday 30 November at 1.45pm. Open to all!

On November 30, 2017 from 13:45 To 14:30

This week:

Julio Cesar Fernandez Polo was recently admitted to Centrale Nantes as a Post-Doctorate. He graduated in Naval Architecture from "Universidad Nacional de Ingeneria" (Peru 2004-2009) and he holds a Master and PhD in Ocean Engineering from "Universidade Federal do Rio de Janeiro". He was a Research and Teaching Assistant (Brazil 2010-2017) and Visiting Researcher at "University of Michigan" (United States 2015-2016). Interested in stability of floating systems in waves, the focus of his PhD thesis was to study stochastically the nonlinear phenomenon of Parametric Rolling. The objective of his work at ECN is to couple the external force of water in deck, also known as Green Water effect,  in the prediction of motion of floating systems under the influence of head waves through a fast and accurate numerical method.

He will present his previous work entitled :

The summary of the presentation is given below: Mesh of the NTU containership
For this work, three mathematical models for the simulation of motion of floating systems were developed. The developed models are capable of simulating the heave, roll and pitch motions under regular and irregular longitudinal head waves. Particular effort has been made in capturing in an accurate and efficient manner the restoring actions in the developed models. This is a fundamental feature required in order to reproduce numerically the parametric roll resonance phenomenon. Numerical realizations of the motions of a containership type vessel have been generated for the purpose of studying the stationarity and ergodicity of the roll motion under parametric resonance conditions. The results obtained have shown that for containerships the stochastic roll process could be consider as a stationary process. Finally, the extreme roll responses were used for fitting the Generalized Extreme Value Distribution (GEVD) and the Generalized Pareto Distribution (GPD). Then, using the fitted GEVD, the return period and the time between events for roll motions were computed for two wave conditions.
Published on September 29, 2017 Updated on July 8, 2018