Now showing items 2123-2142 of 3412

    • Natural frequency estimation by using torsional response, and applications for wind turbine drivetrain fault diagnosis 

      Khazaeli Moghadam, Farid; Nejad, Amir R. (Journal article; Peer reviewed, 2020)
      A method based on torsional vibration measurements for a system-level condition monitoring of the drivetrain system is developed in this paper. The latter is tested by using a 10MW wind turbine drivetrain simulation model, ...
    • Navigation and collision avoidance of underwater vehicles using sonar data 

      Grefstad, Ørjan; Schjølberg, Ingrid (Journal article; Peer reviewed, 2018)
      Collision avoidance is one of the main challenges in the field of autonomous underwater vehicles (AUV). In this paper a method for detecting obstacles is proposed, using a single-beam mechanically scanning sonar, including ...
    • Navigation and Control of Underwater Robotic Vehicles 

      Jørgensen, Erlend Kvinge (Doctoral theses at NTNU;2018:86, Doctoral thesis, 2018)
      The thesis considers navigation and control of underwater robotic vehicles, and is divided into two parts, with more emphasis on Part II. Part I considers stabilization of the end effector of an underwater vehicle-manipulator ...
    • Navigation of ROVs and Basic Signal Processing 

      Truong, Phat Tan (Master thesis, 2011)
      A dynamic positioning (DP) system for a ROV is being developed in the Automated Underwater Robotics (AUR) laboratory at the Norwegian University of Science and Technology (NTNU). The AUR lab at NTNU has a ROV and a research ...
    • Navigation techniques for underwater vehicles in polar regions 

      Lone, Thomas Erling (Master thesis, 2020)
      Hovedfokuset for denne masteroppgaven har vært å forbedre navigasjonssystemer for AUVer og tilpasse dem polare strøk. Metodene er implementert og testet i simulering. Menneskeskapte utfordringer som global oppvarming ...
    • Navigation, guidance, and control for autonomous docking of ships 

      Gauslaa, Elias (Master thesis, 2020)
      Denne oppgaven presenterer en autonom dokkingkontroller som bruker tradisjonelle sensorer, med hjelp av nærhetssensorer. Dokkingkontrolleren er i stand til å legge et marint overflatefartøy til kai autonomt på en sikker ...
    •  Analysis of the ballast system of WindFlip 

      Alvheim, Atle (Master thesis, 2010)
       The thesis firstly includes a study of the structure and requirements of a general ballast system. Based on this knowledge a ballast system suiting the needs of the WindFlip concept was designed through using the ...
    •  Guidelines for selection of a ship ballast water treatment system. 

      Berntzen, Magnus (Master thesis, 2010)
      The purpose of the thesis was to develop a decision support system for ballast water treatment systems, considering both technical and economical aspects of the system. This was done by developing a two part model, which ...
    •  Heavy Lift Methods in Decommissioning of Installations 

      Breidablikk, Line Småge (Master thesis, 2010)
       In this report decommissioning of offshore petroleum platforms have been investigated. It treats decommissioning in general, the process of a typical project. A variety of suitable lifting vessels have been presented, ...
    •  Loads on the Hywind wind turbine during the "flipping-phase" with WindFlip 

      Kvalheim, Espen Vårdal (Master thesis, 2010)
      WindFlip is a concept for transportation and installation of fully assembled floating offshore wind turbines. In this master thesis the relevant part of the operation is the flipping-phase. The flipping-phase is defined ...
    •  Mikrokraftverk for varme- og strømproduksjon 

      Heinänen, Pekka Einar Andersen (Master thesis, 2010)
      Målet for masteroppgaven var å gjøre målinger på en dampmaskin ved MTS under forskjellige driftstilstander og finne ut hvordan den effektivt kan brukes under forskjellig driftstilstander. Når anlegget er ferdig skal det ...
    •  Sammenligning av ulike metoder innen ekstremverdistatistikk 

      Bartz-Johannessen, Christoffer (Master thesis, 2010)
      Hensikten med denne oppgaven har vært å se på ulike metoder som i dag benyttes for å predikere ekstremverdier i marin sammenheng. Fem ulike metoder er sammenlignet. Metodene er valgt på grunnlag av hvor mye de benyttes og ...
    •  Simulation of TDP Dynamics during S-laying of Subsea Pipelines 

      Hong, Wei (Master thesis, 2010)
      During the past one and a half decade, pipeline has been proven to the most economical means of large scale overland transportation for crude oil, natural gas and other products. At the same time, more and more problems ...
    • Near-Wake of an Inclined 6:1 Spheroid at Reynolds Number 4000 

      Strandenes, Håkon; Jiang, Fengjian; Pettersen, Bjørnar; Andersson, Helge Ingolf (Journal article; Peer reviewed, 2019)
      The flow around a 6:1 prolate spheroid at 45 deg inclination angle and Reynolds number 4000 (based on the minor axis) is described. Despite the fact that the inflow is uniform and steady, the resulting wake is highly ...
    • Near-wall effect on flow around an elliptic cylinder translating above a plane wall 

      Zhu, Jianxun; Holmedal, Lars Erik; Myrhaug, Dag; Wang, Hong (Peer reviewed; Journal article, 2020)
      In this work, the flow over an elliptic cylinder near a moving wall is investigated for Reynolds numbers less than 150. Here, the ratio between the gap (i.e., the distance between the cylinder and the wall) and the length ...
    • A new method for optimal ship design in real sea states using the ship power profile 

      Esmailian, Ehsan; Steen, Sverre (Peer reviewed; Journal article, 2022)
      Typically, ships are designed for calm water and a constant design speed. However, a ship experiences different speeds and sea conditions over her lifetime. Following the significant correlations between environment and ...
    • A new power prediction method using ship in-service data: a case study on a general cargo ship 

      Esmailian, Ehsan; Kim, Youngrong; Steen, Sverre; Koushan, Kourosh (Journal article; Peer reviewed, 2023)
      To increase energy efficiency and reduce greenhouse gas (GHG) emissions in the shipping industry, an accurate prediction of the ship performance at sea is crucial. This paper proposes a new power prediction method based ...
    • New Renewable Hydrothermal Liquefaction (HTL) Biofuel: A Combustion and Emissions Study in an Optical Engine 

      Khare, Shivang; Bjørgen, Karl Oskar Pires; Kohansal, Komeil; Haider, Muhammad Salman; Castello, Daniele; Pedersen, Thomas Helmer; Løvås, Terese; Emberson, David Robert (Journal article; Peer reviewed, 2023)
      This study involves the investigation of municipal solid waste (MSW) based biofuel in order to demonstrate its utilization as a diesel blendstock in a compression ignition (CI) engine. The biofuel was produced from the ...
    • New risk control mechanism for innovative deepwater artificial seabed system through online risk monitoring system 

      Zhen, Xingwei; Vinnem, Jan Erik; Han, Yue; Peng, Changyi; Yang, Xue; Huang, Yi (Journal article, 2020)
      The current offshore field development concepts (dry tree or subsea tree) have limitations for petroleum production in ultra-deep water (more than 1500 m), where the challenges are characterized by the depth of water, ...
    • Next Generation Subsea Inspection, Maintenance and Repair Operations 

      Schjølberg, Ingrid; Gjersvik, Tor Berge Stray; Transeth, Aksel Andreas; Utne, Ingrid Bouwer (Peer reviewed; Journal article, 2016)
      This paper presents the latest developments in the project Next Generation Subsea Inspection, Maintenance and Repair (IMR). Subsea IMR operations are frequently carried out in the offshore oil and gas business. Increased ...