A goal-based approach for selecting a ship's polar class

| openaire: EC/H2020/723526/EU//SEDNA Following the International Code for Ships Operating in Polar Waters (Polar Code), ships operating in ice-covered polar waters must comply with an appropriate Polar Class (PC) or equivalent ice class standard. For the selection of an appropriate Polar Class, shi...

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Bibliographic Details
Published in:Marine Structures
Main Authors: Bergström, Martin, Li, Fang, Suominen, Mikko, Kujala, Pentti
Other Authors: Marine Technology, Department of Mechanical Engineering, Aalto-yliopisto, Aalto University
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier Ltd. 2022
Subjects:
Arctic shipping
Discrete-event simulation
Ice class
Polar code
POLARIS
Ship design
Arctic
Canada
Online Access:https://aaltodoc.aalto.fi/handle/123456789/111371
https://doi.org/10.1016/j.marstruc.2021.103123
Description
Summary:| openaire: EC/H2020/723526/EU//SEDNA Following the International Code for Ships Operating in Polar Waters (Polar Code), ships operating in ice-covered polar waters must comply with an appropriate Polar Class (PC) or equivalent ice class standard. For the selection of an appropriate Polar Class, ship designers and operators are encouraged to use the Polar Operational Limit Assessment Risk Indexing System (POLARIS). A limitation of POLARIS is that it does not consider the extent to which a ship operates in various ice conditions, and thus also not the probabilistic nature of ice loading. To address this limitation, this article outlines a goal-based approach that is intended to complement POLARIS when selecting a ship's Polar Class. Following the proposed approach, the appropriateness of a ship's minimum required Polar Class as determined using POLARIS is evaluated by assessing the ship's long-term extreme ice loads, and by relating these to the design loads behind the considered Polar Class standard. To account for the probabilistic nature of iceloading, the approach calculates a ship's long-term extreme ice loads considering its intended operating profile and expected ice exposure. This is achieved by synthesising a modified version of the so-called event-maximum method, discrete-event simulations, and satellite ice data. The utility of the proposed approach is demonstrated through a case study, in which it is used as a complement to POLARIS to select an appropriate Polar Class for a double-acting ship intended for year-round independent operations along the northeast coast of Canada. Peer reviewed

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