A general procedure for the analytical approximation of the restoring arm in regular longitudinal waves is presented. The aim of the approximation is to obtain an analytical and accurate means for substituting the look-up table method in time domain simulations of realistic nonlinear parametric roll. The model is based on a 1.5-DOF system: the roll motion is modelled dynamically using a single degree of freedom, whereas the additional half DOF indicates that the coupling with heave and pitch is taken into account by means of hydrostatic calculations without considering dynamic effects. An analysis of the accuracy of the analytical approach is carried out taking into consideration different aspects of the problem (time histories, domains of attraction, chaotic behaviour, etc.). All the simulations are performed using data obtained from a real ship hull of a RoRo-Pax.

Nonlinear parametric rolling in regular Waves - a general procedure for the analytical approximation of the GZ curve and its use in time domain simulations

BULIAN, GABRIELE
2005-01-01

Abstract

A general procedure for the analytical approximation of the restoring arm in regular longitudinal waves is presented. The aim of the approximation is to obtain an analytical and accurate means for substituting the look-up table method in time domain simulations of realistic nonlinear parametric roll. The model is based on a 1.5-DOF system: the roll motion is modelled dynamically using a single degree of freedom, whereas the additional half DOF indicates that the coupling with heave and pitch is taken into account by means of hydrostatic calculations without considering dynamic effects. An analysis of the accuracy of the analytical approach is carried out taking into consideration different aspects of the problem (time histories, domains of attraction, chaotic behaviour, etc.). All the simulations are performed using data obtained from a real ship hull of a RoRo-Pax.
2005
Pubblicato
File in questo prodotto:
File Dimensione Formato  
Par_Roll_GZ__Bulian__2005.pdf

Accesso chiuso

Tipologia: Documento in Versione Editoriale
Licenza: Copyright Editore
Dimensione 916.66 kB
Formato Adobe PDF
916.66 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/1750527
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 87
  • ???jsp.display-item.citation.isi??? 67
social impact