Browsing NTNU Open by Author "Kim, Ekaterina"
Now showing items 21-40 of 56
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Evaluating Human and Machine Performance on the Classification of Sea Ice Images
Pedersen, Ole-Magnus; Kim, Ekaterina (Chapter, 2020)Abstract: Safe navigation in Arctic seas requires qualified judgement of the ice conditions of ice around the vessel, a skill that takes years of training to master. At the same time, melting of the polar ice is allowing ... -
Experimental and numerical studies related to the coupled behavior ofice mass and steel structures during accidental collisions
Kim, Ekaterina (Doktoravhandlinger ved NTNU, 1503-8181; 2014:135, Doctoral thesis, 2014)More and more people are attracted to go North. To design a fixed or a floating structure for Arctic conditions, to set operational limits or to specify certain safety requirements, one must rely on limited knowledge, data ... -
Fluid-structure-interaction analysis of an ice block-structure collision
Song, Ming; Kim, Ekaterina; Amdahl, Jørgen (Journal article; Peer reviewed, 2015)Due to climate change, production and transportation routes in Arctic regions are becoming more prevalent. When operating in Arctic waters, there is a significant risk of high energy encounters with smaller ice masses such ... -
Freeze-Bond Strength: Analysis of Experiments and FE Modeling of a shear test on freeze-bonds
Kim, Ekaterina (Master thesis, 2009) -
How safe were vessels during research cruises in Arctic in 2007-2019? Linking the Ice Watch Data and the Polar Operational Limits Assessment Risk Index System
Øyen, Karin Assev; Kim, Ekaterina (Chapter, 2021)The present work analyzes cruise data from the Ice Watch database and applies the IMO's Polar Operational Limit Assessment Risk Indexing System (POLARIS) with ice observations. The results of this study showed that on ... -
Hybrid causal logic model for estimating the probability of an icebreaker–ship collision in an ice channel during an escort operation along the Northeast Passage
Xu, Sheng; Kim, Ekaterina (Peer reviewed; Journal article, 2023)Under severe Arctic ice conditions, escort operations are the most efficient methods for facilitating shipping. Nevertheless, escort operations are among the most dangerous operations, as they may result in icebreaker–ship ... -
Iceberg shape characterization for damage assessment of accidental impacts with ships and offshore structures
Myhre, Torstein (Master thesis, 2013)The northern areas are becoming more and more attractive because off the large oil and gas reservoir that is there. In this area there is a harsh environment and the possibility to collide with an iceberg increases as the ... -
Laboratory experiments on shared-energy collisions between freshwater ice blocks and a floating steel structure
Kim, Ekaterina; Storheim, Martin; Amdahl, Jørgen; Løset, Sveinung; von Bock und Polach, Rüdiger Ulrich Franz (Journal article; Peer reviewed, 2017)Ship collisions with floating ice in which the ship sustains damage are in the shared-energy regime – both the ice and the ship dissipate energy through inelastic deformations. The physics of these events are rarely studied. ... -
Making sense of speed effects on ice crushing pressure-area relationships in IACS ice-strengthening rules for ships
Kim, Ekaterina; Amdahl, Jørgen; Wang, Xintong (Journal article; Peer reviewed, 2021)Arctic shipping fleet expansion is anticipated in the future. However, future refinements in the understanding of ice loads on larger ships are needed to achieve a better structural design with reduced steel weight. Published ... -
Multi Modal Mapping of Sea Ice Fields From Remote Shipborne Instrumentation
Veggeland, Oskar Gjesdal; Kim, Ekaterina; Skjetne, Roger (Chapter, 2024)This work investigates the perception bias caused by ice floes occluding open water regions behind them when analyzing sea ice from shipborne cameras. We propose a method to model this effect by predicting an occlusion ... -
A non-linear viscoelastic material model with progressive damage based on microstructural evolution and phase transition in polycrystalline ice for design against ice impact
Mokhtari, Mojtaba; Kim, Ekaterina; Amdahl, Jørgen (Peer reviewed; Journal article, 2023)This study presents a nonlinear viscoelastic material model incorporating a progressive damage framework with an iterative algorithm for glacial/freshwater polycrystalline ice subject to compressive impact load induced by ... -
Numerical analysis of pit-to-crack transition under corrosion fatigue using a stochastic pit generation algorithm
Mokhtari, Mojtaba; Kim, Ekaterina; Amdahl, Jørgen (Chapter, 2023)In numerical corrosion fatigue studies, the complex pit morphology is often idealized using an overly simplified geometry with a smooth surface because of the difficulties involved in modelling defects with the irregular ... -
Numerical Investigation of Fluid-Ice-Structure Interaction During Collision by an Arbitrary Lagrangian Eulerian Method
Song, Ming; Kim, Ekaterina; Amdahl, Jørgen; Greco, Marilena; Souli, M'Hamed (Chapter; Peer reviewed, 2016)When ice floes collide against marine structures, pronounced hydrodynamic loads are induced by the water-ice-structure interaction. With today’s highly competitive structural design market, it is nearly impossible to ignore ... -
Numerical Simulation of Concurrent Flexural and Crushing Failure of Level Ice
Mokhtari, Mojtaba; Kim, Ekaterina; Amdahl, Jørgen (Chapter, 2024) -
Ocean space utilization
Schreier, Sebastian; Arena, Felice; Bingham, Harry; Fonseca, Nuno; Hu, Zhiqiang; Karmakar, Debabrata; Kim, Ekaterina; Li, Hui; Liu, Pengfei; Murai, Motohiko; Pahos, Spiro J; Tian, Chao; Wang, George (Chapter, 2022)In the light of rising sea level, scarcity of land-based resources and increasingly populated coastal areas, interest of project developers and countries turns towards the ocean, exploring the possibilities of utilizing ... -
On a shifting pressure-area relationship for the accidental limit state analysis of abnormal ice actions
Kim, Ekaterina; Amdahl, Jørgen; Song, Ming (Chapter, 2017)The relationship between pressure and area is often used to describe various ice-structure interaction processes. With knowledge of the nominal contact area and the force, a continuous plot of average pressure versus ... -
On ice model validation and calibration strategies for damage as-sessment of structures subjected to impact actions
Kim, Ekaterina; Song, Ming; Amdahl, Jørgen (Chapter, 2016)The number of numerical ice models in structural design is growing, and classical Lagrangian finite element formulation is still dominant for numerical simulations. In design of ships and offshore structures, the numerical ... -
Optimisation of a New Energy System in Longyearbyen based on LNG and Solar Energy - Applying Mixed Integer Linear Programming and a Rolling Horizon Heuristic
Hovden, Petter (Master thesis, 2018)Longyearbyen is an isolated, Arctic settlement, where the energy situation is facing changes in near future. Today s energy system in Longyearbyen is a stand-alone system, consisting of a coal power plant as primary power ... -
Pilot study of ice-structure interaction in a pendulum accelerator
Storheim, Martin; Nord, Torodd Skjerve; Kim, Ekaterina; Høyland, Knut Vilhelm; Langseth, Magnus; Amdahl, Jørgen; Løset, Sveinung (Journal article; Peer reviewed, 2015)More knowledge on the coupled response of ice and structure in collision in which both bodies undergo permanent damage is needed. These types of experiments are challenging to perform in a laboratory at relatively high ... -
Predicting ship speeds in the Arctic using deep learning on historical AIS data
Kim, Ekaterina; Smestad, Bjørnar Brende; Asbjørnslett, Bjørn Egil (Chapter, 2020)This study offers a perspective of applying fully connected neural networks (NN) to predict vessels’ speeds on a part of the Northern Sea Route and discusses its challenges. A fully connected neural network model was used ...