| Autor: |
Ermina Begović, Guido Boccadamo, Barbara Rinauro, Gennaro Rosano |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
International Journal of Naval Architecture and Ocean Engineering, Vol 14, Iss , Pp 100473- (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2092-6782 |
| DOI: |
10.1016/j.ijnaoe.2022.100473 |
| Popis: |
Excessive acceleration criterion, developed by the International Maritime Organization within the Second Generation Intact Stability Criteria, deals with lateral accelerations experienced by people onboard. Level 2 criterion considers the ship at zero speed in beam waves, neglects diffraction and gives the expressions for the Froude-Krylov roll moment. In this paper, the Level 2 procedure is generalized for any ship speed and heading by developing the expressions for the Froude-Krylov exciting roll moment as a function of the heading angle and introducing a variance preserving transformation from encounter to wave frequency. The proposed procedure can be easily implemented in a user's code to assess the simplified Operational Guidance without the use of commercial software. The proposed expression is validated comparing the Froude-Krylov roll moment with the one obtained by the 3-D potential code HydroStar®, referring to a barge and a bulk carrier. The bulk carrier is selected as test case to develop the simplified Operational Guidance according to the proposed procedure. A polar diagram representation is chosen to identify safe combinations of ship speeds and heading while a tabular representation is proposed for a given heading to identify the minimum ship speed to avoid large lateral accelerations, for the sea states reported in standard wave scatter table. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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