A new approach to ice load estimation in time domain for Arctic vessels

Abstract

This study considers a new method for the ice load consideration based on the ice load spectrum in the time domain. Recently, the interest on the Arctic offshore structures for exploring and exploitation of the Arctic region has been increased by the decreasing trend of sea ice covered area. The ice load consideration in the design of the Arctic offshore structures is essential. In the design and evaluation of the station-keeping system of the Arctic offshore structures, the consideration of the ice load acting on the offshore structures is one of the main vital components. There are several methods to consider the ice load in the time domain analysis. However, these numerical approaches require a significant amount of computation because the number of ice floes to be considered in the calculation is too big. In this study, a new approach to consider the ice load acting on the Arctic offshore structure is suggested. The proposed ice load calculation method in time domain is based on the ice load spectrum concept. From the experimental results, it is expected that the global ice load will have mean components and oscillatory components in the frequency domain. Thus, if the mean components and oscillatory components of the ice load by the angle of attack of the ice drifting with ice parameters are given, then the ice load acting on the offshore structure can be reconstructed. The feasibility of the proposed ice load consideration method is examined with experimentally gained data and numerically calculated data. Copyright ？ 2018 by the International Society of Offshore and Polar Engineers