Turning maneuver as a potential cause of the next stability failure mode for a ship in operation

Tomasz Hinz, Przemysław Krata, Jerzy Matusiak, Katarzyna Malinowska

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaKonferenssiesitysScientificvertaisarvioitu


The only formal stability-related requirement referring to a turning maneuver of a ship results from the IS Code and its application is limited to passenger ships only. The goal of the adopted criterion is to prevent an excessive angle of heel in turn. Likewise, the remaining prescriptive criteria, this one is simply based on the concept of a threshold that must not be exceeded. In this case, the angle of heel should remain below 10 degrees. The heel evaluation is based on a straightforward static moments balance model, which is obtained with the use of GZ curve, without consideration of any dynamic effects. At the same time, according to COLREG convention, a ship collision evasive action typically consists of the turn to starboard, occasionally even quite hard turn, if necessary. Thus, the ship heel in turns is unavoidable and the dynamics-related component adds up to the static one, potentially resulting in excessive asymmetric dynamic heeling. Such a maneuver, if undertaken rapidly, may be risky since its aftermath might be serious which is revealed by accidents evidence, e.g., the disaster of Sewol ferry in 2014 with the death toll stood at 294.

Inspired by the SGISC philosophy we conducted the first stage of investigation on determination of the dynamic angle of heel in turns, with the view on a potential future extension of the list of stability failures covered by the SGISC. A series of ship motion simulations was carried out in order to identify whether the simple GZ-based criterion may be found adequate. The simulations accounted for both the maneuverability and stability characteristics of a sample ship. The up-to-date 6DoF ship dynamics model was utilized to enable covering major deficiencies of the possibly oversimplified static approach. The contemporary IS Code recommended criterion outcome for a large passenger ship was compared to the results of numerous simulations performed for turns in calm water. A proposal of the criterion modification that has been submitted in 2013 in the document SDC 1/14/1 was included for the comparison as well. The main intended objective of this article is to initiate a discussion on the possible future modification of the stability during turning criterion. This issue is pretty much in line with the ship design process but all the more relevant to day-to-day navigation since collision avoidance, and thus turning at high speed, is unavoidable in the course of a routine operation.
TilaJulkaistu - kesäk. 2021
OKM-julkaisutyyppiEi oikeutettu
TapahtumaInternational Conference on the Stability and Safety of Ships and Ocean Vehicles - University of Strathclyde, Glasgow, Iso-Britannia
Kesto: 7 kesäk. 202111 kesäk. 2021
Konferenssinumero: 1


ConferenceInternational Conference on the Stability and Safety of Ships and Ocean Vehicles


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