Blar i Department of Mechanical and Structural Engineering and Materials Science (TN-IMBM) på tittel
Viser treff 1135-1154 av 1695
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Numerical study of a concept for major repair and replacement of offshore wind turbine blades
(Peer reviewed; Journal article, 2020-03)Repair and replacement of offshore wind turbine blades are necessary for current and future offshore wind turbines. To date, repair activities are often conducted using huge jack-up crane vessels and by applying a reverse ... -
Numerical Study of Oxygen Transport in Aquaculture Tanks With Different Geometries
(Master thesis, 2022)The transport of dissolved oxygen concentration in water for aquaculture is a core parameter affecting the quality of yielded fish. An emerging shift from offshore to land-based aquaculture presents advan- tages to marine ... -
Numerical study of two typical Norwegian gravity-based fish cages with different cage shapes and weights
(Master thesis, 2021)Fish cages usually have net deformation in marine environments, and this deformation can reduce the cultivation volume of the fish cage and thus reduce the fish welfare. Hence, it is necessary to understand the structural ... -
Numerical study on controller of offshore wind turbine and its effect on turbine loads
(Master thesis, 2021)The primary objective of this thesis is to evaluate the controller behavior of a large-scale wind turbine and investigate how the controller design can affect the fatigue damage for the turbine. In addition, it is interesting ... -
Numerical study on deployment of subsea template using coupled and uncoupled model
(Peer reviewed; Journal article, 2021)This study compares deployment of a subsea template simulated as a coupled model and as an uncoupled model in the time domain simulation software Orcaflex. Defining vessel motion as prescribed simplifies the model and will ... -
Numerical study on gap resonance coupled to vessel motions relevant to side-by-side offloading
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-07-13)Floating Liquefied Natural Gas (FLNG) systems are large facilities dealing with offshore storage, processing, and transport of natural gas from the ocean basin. These enormous vessels allow the natural gas to be produced ... -
Numerical Study on Offshore Lifting Operations of a Subsea Spool
(Masteroppgave/UIS-TN-IMBM/2018;, Master thesis, 2018-06)Within the scope of marine operations, offshore lifting operations present significant challenges due to the instability and harshness of environmental conditions. Therefore, lifting operations become expensive and risky. ... -
Numerical study on splash zone crossing with GRP protection cover.
(Master thesis, 2022)For oil and gas fields moving further offshore, it has been more common to use a subsea production system or a combination of rig and subsea structures. These subsea structures must be overtrawlable if they are not marked ... -
Numerical study on splash zone crossing with subsea template and ROV
(Master thesis, 2021)External loads on a free-floating vessel affect the vessel responses in waves. DNV’s recommended practice for modeling and analysis of marine operations [1] categorizes lifting of an object above 1-2% of the vessel ... -
Numerical study on structural responses of gravity-based fish cages
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020)The location of a fish farm is moving towards more exposed locations due to spatial and environmental concerns. As the fish farm moves to open seas, the structure of the fish farm would undergo increased environmental loads ... -
Numerical study on the deployment of a subsea template
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-06-30)Subsea templates are normally transported to the installation site on the deck of a crane vessel. After being lifted off from the deck, the template is 1) over-boarded from the initial location to the target position by the ... -
Numerical study on thermal effects in an electric subsea robotic actuator
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-07-07)A remotely operated vehicle (ROV) is equipped with two robotic manipulators. Current manipulators are hydraulically actuated. The industry has uncovered the potential in replacing hydraulic-based technology with its ... -
Numerical study on vibratory extraction of offshore wind turbine monopile foundations under sandy seabed condition
(Peer reviewed; Journal article, 2023)The wind industry has experienced a rapid growth in Europe over the last decades. The early generation turbines were designed for a life of 20–25 years. Decommissioning of offshore wind turbines is becoming more important ... -
An object-oriented method for fully coupled analysis of floating offshore wind turbines through mapping of aerodynamic coefficients
(Peer reviewed; Journal article, 2021-07)This work presents a novel object-oriented approach to model the fully-coupled dynamic response of floating offshore wind turbines (FOWTs). The key features offered by the method are the following: 1) its structure naturally ... -
Observations of bridge stay cable vibrations in dry and wet conditions: A case study
(Peer reviewed; Journal article, 2021)The characteristics of wind- and rain-wind-induced vibrations of bridge stay cables are studied by using ambient vibrations records acquired on a cable-stayed bridge. Mean wind speed and wind-cable angle, as well as the ... -
Occurrence of Wind-Wave Misalignment using FINO and OBLEX data
(Masteroppgave/UIS-TN-IMBM/2018;, Master thesis, 2018-06-15)Wind-wave interaction has been an important aspect of environmental conditions to be considered for offshore wind turbine performance, especially in deeper water at stable atmospheric conditions such as North Sea. It is ... -
Offloading operation bivariate extreme response statistics for FPSO vessel
(Peer reviewed; Journal article, 2023)The Floating Production Storage and Offloading unit (FPSO) is an offshore unit producing and storing crude oil prior to tanker transport. An important design concern is an accurate prediction of risky dynamic hawser tensions ... -
Offshore hook-up project management
(Masteroppgave/UIS-TN-IKM/2014;, Master thesis, 2014-05-28)There is a lot going on offshore at the Norwegian Sector these days. Especially on the Ekofisk field, this is one of the oldest and most important fields in the North Sea. Ekofisk 2/4 Lima (EKOL) is the newest addition ... -
Offshore ice-resistant fixed platform for the Dolginskoye field in the Pechora Sea
(Masteroppgave/UIS-TN-IKM/2014;, Master thesis, 2014-06-16)Oil and Gas fields on the Russian Arctic Shelf are very difficult to develop as there is a lack of relevant experience around the world. Existing technical solutions should be improved and adjusted to the specific ... -
Offshore ice-resistant gravity based terminal for the cluster development of the Pechora Sea
(Masteroppgave/UIS-TN-IKM/2015;, Master thesis, 2015-06-12)The Arctic shelf of Russia is an area of great interests. The process of hydrocarbons offloading is the most significant challenge for the Arctic projects, mostly because of the harsh environmental conditions and lack of ...