Browsing NTNU Open by Author "Kim, Ekaterina"
Now showing items 1-20 of 50
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A comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions
Song, Ming; Kim, Ekaterina; Amdahl, Jørgen; Ma, Jun; Huang, Yi (Journal article, 2016)The constant added mass (CAM) method and the fluid-structure interaction (FSI) method are widely used to simulate ship-ship and ship-ice collisions. In the CAM method, the hydrodynamic effect of the surrounding water is ... -
A phenomenological explanation of the pressure-area relationship for the indentation of ice: Two size effects in spherical indentation experiments
Kim, Ekaterina; Schulson, EM (Journal article, 2015)Indentation tests provide a simple means to study the inelastic behavior of ice and other materials when loaded under a compressive stress state. Such tests provide force–time plots which are often converted to pressure–area ... -
A Preliminary Analysis of the Crushing Specific Energy of Iceberg Ice under Rapid Compressive Loading
Kim, Ekaterina; Gagnon, R (Journal article, 2017)Indentation tests are used to study inelastic response of ice and other materials when loaded under a compressive stress state. Indentation testing provides force–time plots which are often converted to pressure–area curves, ... -
Agree – Disagree: Comparing Traffic Limitations in the Kara Sea
Kim, Ekaterina; Panchi, Nabil (Chapter, 2021)This study investigates variability of ships’ operational limitations for ice conditions in view of national rules and international recommendations (the Rules for Navigation in the Water Area of the Northern Sea Route and ... -
Analysis of accidental iceberg impacts with large passenger vessels
Wang, Suyu (Master thesis, 2017)The number of collisions between ships and ice are increasing with the increase of ships sailing in Arctic areas. It is necessary to research on large passenger ships subjected to iceberg impact, since it may cause huge ... -
Analysis of accidental iceberg impacts with large passenger vessels and FPSOs
Radhakrishnan, Gowtham (Master thesis, 2018)This Master thesis is part of the degree for the Nordic Masters in Maritime Engineering -
Analysis of Arctic shipping operations using enhanced historical AIS data
Kolbjørnsgard, Sindre (Master thesis, 2022)Dagens utfordringer for en bærekraftig utvikling av den maritime næringer i Arktisk inkluderer å opprettholde konkurransefortrinne globalt, optimalisere energikilder og minimere den totale miljøpåvirkning. International ... -
Analysis of Iceberg-Structure Interaction During Impacts
Wang, Xintong (Master thesis, 2020)With the increase of the maritime production and transportation in the arctic area, more offshore structures and ships are designed and built for operation in the ice infested water. The potential impact with the ice ... -
Applying CAST to investigation of the FPSO’s incident with an iceberg
Kim, Ekaterina; Utne, Ingrid Bouwer; Kim, Hyungju (Journal article; Peer reviewed, 2019)On 29 March 2017, the floating production storage and offloading unit (FPSO) did not disconnect and sail away when a medium iceberg came close to the FPSO. The tow of the iceberg was unsuccessful, and the crew was instructed ... -
Arctic Vision: Using Neural Networks for Ice Object Classification, and Controlling How They Fail
Pedersen, Ole-Magnus; Kim, Ekaterina (Peer reviewed; Journal article, 2020)Convolutional neural networks (CNNs) have been shown to be excellent at performing image analysis tasks in recent years. Even so, ice object classification using close-range optical images is an area where their use has ... -
Artificial intelligence for ship speed management during navigation in the Arctic
Kim, Ekaterina; Skjetne, Roger (Peer reviewed; Journal article, 2021)Difficult ice conditions are one of the major threats to ships, shipboard crew, and cargoes carried in Arctic waters. Ship-speed choice is influenced by many factors including the navigational conditions (ice, weather, ... -
Assessment of Operational Risks in Polar Areas – Risk Assessment using the Polar Operational Limits Assessment Risk Indexing System (POLARIS) and Predictive Simulations
Øyen, Karin Assev (Master thesis, 2020)Sjøulykker i polare områder har økt det siste tiåret, og skipets aktivitet i farvann med havis forventes å øke i fremtiden. Det er av interesse å opprettholde sikker skipsdrift og holde alle skip innenfor sine operasjonelle ... -
A Bayesian network risk model for predicting ship besetting in ice during convoy operations along the Northern Sea Route
Xu, Sheng; Kim, Ekaterina; Haugen, Stein; Zhang, Mingyang (Journal article; Peer reviewed, 2022)To facilitate shipping in ice and to meet the increasing requirements of icebreaker services, convoy operations are the most effective alternative. However, convoy operations are among the most dangerous operations as they ... -
Can a computer see what an ice expert sees? Multilabel ice objects classification with convolutional neural networks
Kim, Ekaterina; Dahiya, Gurvinder; Løset, Sveinung; Skjetne, Roger (Journal article; Peer reviewed, 2019)Computer-aided scene analysis has drawn much attention, especially in autonomous navigation and advanced navigation assistance systems for surface vessels. In ice-infested waters, multilabel ice object classification and ... -
Concept of the Specific Energy of the Mechanical Destruction of Ice versus the Ice Pressure-Area Relationship: Review and Discussion
Kim, Ekaterina; Tsuprik, Vladimir G. (Chapter, 2018)For a structure-ice interaction process, a continuous record of force versus time can be converted to an ice pressure–area curve, or it can be used to find the specific energy of the mechanical destruction of ice (crushing ... -
Discussion of assumptions behind rule-based ice loads due to crushing
Kim, Ekaterina; Amdahl, Jørgen (Journal article; Peer reviewed, 2016)Forecasts and trends indicate an increase in marine operations in polar waters. The design of new ships for severe polar conditions is usually solved via theoretical considerations that are combined with previous experience ... -
Do vessels remain within their operational limitations in ice? Analyzing the risks of vessels operating in the Kara Sea region using POLARIS
Panchi, Nabil; Kim, Ekaterina; Xu, Sheng (Chapter, 2020)This study investigates whether the vessels remain within their operational limitations in ice using the risk index calculated based on the Polar Operational Limitations Assessment Risk Indexing System (POLARIS) - an ... -
Dynamic response analysis of a semi-submersible floating wind turbines under combined ice and aerodynamic loads
Pettineo, Enrico (Master thesis, 2021)This thesis aims to analyze the dynamic response of a semi-submersible floating wind turbine under combined wind and ice loads through a coupled analysis. The importance of the topic is due to the increased interest and ... -
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 ...