On the intact stability of a ship in head and following sea: an analysis of the dynamic roll angle due to sudden heeling moments

Maria Acanfora*, Antonio Cirillo

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

The verification of ship stability has been historically carried out on the GZ curve and on the dynamic lever curve. They are both evaluated in still water. Recently, new methods have been developed, accounting for dynamic instabilities in waves. The present research study aims to investigate on the dynamic stability of a ship in waves. This is carried out by means of numerical simulations of the transient roll response of the ship, caused by sudden heeling action. The effective influence of longitudinal waves (that is head and following sea) on the dynamic angle of roll is investigated at different frequencies. The effects of the wave amplitude, of the damping and of the relative position of the wave crest on the ship, when the heeling action is applied, are analyzed. The study is carried out using a numerical model that takes into account the pertinent non-linearities on restoring and Froude–Krylov actions. Step functions are used to simulate heeling moments on the ship to check transient ship roll responses and detect possible unstable behaviors. The applications are carried out for the DTMB 5415 frigate hull.

Original languageEnglish
Pages (from-to)734-746
Number of pages13
JournalJournal of Marine Science and Technology
Volume22
Issue number4
DOIs
Publication statusPublished - Dec 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Dynamic stability
  • Naval architecture
  • Ship stability

Fingerprint

Dive into the research topics of 'On the intact stability of a ship in head and following sea: an analysis of the dynamic roll angle due to sudden heeling moments'. Together they form a unique fingerprint.

Cite this