Blar i Institutt for marin teknikk på emneord "VDP::Teknologi: 500::Marin teknologi: 580"

Viser treff 21-40 av 40

    • Modeling and Simulation for Design Evaluation of Marine Machinery Systems 

      Nielsen, Jørgen Bremnes (Doctoral theses at NTNU;2019:207, Doctoral thesis, 2019)
      The maritime industry is facing significant changes in the design of marine machinery systems due to stricter regulations on the emission of air pollutants and greenhouse gases and the need for increased energy efficiency. ...

    • Modeling Operational Performance for the Global Fleet & Application of an Energy Saving Measure 

      Kim, Youngrong (Doctoral theses at NTNU;2023:88, Doctoral thesis, 2023)
      In order to reduce greenhouse gas emissions (GHG) from ships at sea, various measures have been considered, such as alternative fuels with low carbon intensity, innovative ship technology, and new policies. To successfully ...

    • Modular Adaptable Ship Design for Handling Uncertainty in the Future Operating Context 

      Choi, Minjoo (Doctoral theses at NTNU;2018:264, Doctoral thesis, 2018)
      A ship's value is dependent on its context as well as its design features. Ship designers therefore need to consider future operating context scenarios for designing a value-robust ship. The context of a ship comprises a ...

    • 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 ...

    • Non-Linear Time Domain Analysis of Deepwater Riser Vortex-Induced Vibrations 

      Kim, Sangwoo (Doctoral theses at NTNU;2022:178, Doctoral thesis, 2022)
      Fatigue analysis of marine risers due to vortex-induced vibrations (VIV) is normally based on semi-empirical frequency domain methods which only allow for linear structural models, excluding non-linear effects (e.g., tension ...

    • Non-Linear Wave-Body Interaction in Severe Waves 

      Hanssen, Finn-Christian Wickmann (Doctoral theses at NTNU;2019:173, Doctoral thesis, 2019)
      Offshore structures located in harsh environments may experience large wave loads and wave-induced responses. The present thesis documents a twodimensional numerical investigation of interactions between fixed or floating ...

    • Nonlinear Wave Loads, and Resulting Global Response Statistics of a Semi-Submersible Wind Turbine Platform with Heave Plates 

      Li, Haoran (Doctoral theses at NTNU;2021:278, Doctoral thesis, 2021)
      Floating wind turbines (FWTs) are considered to be a promising way to harness the energy from winds over deep water and farther offshore. However, there are some challenges to bring this technology to full maturity. In ...

    • Numerical and experimental hydrodynamic study of a vertical circular floating dock in waves 

      Moreau, Maël (Doctoral theses at NTNU;2024:182, Doctoral thesis, 2024)
      A hydrodynamic analysis of a free-floating bottom-less upright circular dock in waves conceived for the installation of spar-type floating offshore wind turbines (FOWT) is carried out in this work for incident wave frequencies ...

    • Onboard Tuning and Uncertainty Estimation of Vessel Seakeeping Model Parameters 

      Han, Xu (Doctoral theses at NTNU;2021:356, Doctoral thesis, 2021)
      The accurate prediction of critical vessel motions is essential for safe and cost-efficient marine operations. Compared with the difference-frequency responses that can be compensated by mooring and dynamic positioning ...

    • Optimal Ship Design for Operating in Real Sea States 

      Esmailian, Ehsan (Doctoral theses at NTNU;2023:118, Doctoral thesis, 2023)
      Currently, ship designers are under increased pressure to provide energy-efficient designs and reduce greenhouse gas emissions. For a long time, ships were mostly designed and optimized for operation in calm water. However, ...

    • Risk-Based Control of Autonomous Surface Ship 

      Johansen, Thomas (Doctoral theses at NTNU;2024:174, Doctoral thesis, 2024)
      The last few decades have seen tremendous technological development in the maritime industry. Improvements in navigation systems such as Global Navigation Satellite Systems have reduced measurement error and uncertainty ...

    • Safe Autonomy in Marine Robotics 

      Bremnes, Jens Einar (Doctoral theses at NTNU;2024:44, Doctoral thesis, 2024)
      The use of marine robots has become increasingly common in various disciplines and industries, such as oceanography, marine biology, archaeology, transportation, offshore energy, fisheries, and security. However, the marine ...

    • Safety and Verification of Advanced Maritime Vessels - An Approach Based on Systems Theory 

      Rokseth, Børge (Doctoral theses at NTNU;2018:119, Doctoral thesis, 2018)
      The past few decades have seen rapid technological development in ships and offshore vessels. Advanced electrical power plants and dynamic positioning (DP) systems are now widespread, and the growing demand for greener and ...

    • Simulator Approach to Concept Analysis and Optimization of Marine Power Plants 

      Maleki Bagherabadi, Kamyar (Doctoral theses at NTNU;2023:236, Doctoral thesis, 2023)
      The strict environmental regulations for the marine sector directed the research studies and industries to develop solutions in compliance with new goals of promoting efficiency and decreasing emissions. Among the solutions, ...

    • Tools and methods to manage risk in autonomous subsea inspection, maintenance and repair operations 

      Hegde, Jeevith (Doctoral theses at NTNU;2018:71, Doctoral thesis, 2018)
      Autonomous subsea interventions are anticipated to decrease operational costs, reduce response time and optimally maintain the subsea infrastructure. However, the introduction of autonomy may lead to emerging risk factors ...

    • Towards Autonomous Operations and Systems in Marine Archaeology 

      Ødegård, Øyvind (Doctoral theses at NTNU;2018:203, Doctoral thesis, 2018)
      A large part of our common cultural heritage, ranging from submerged prehistoric landscapes to modern steel wrecks, lies on the seabed. For centuries they have remained protected by depth and remoteness, but are now under ...

    • Towards autonomous underwater navigation and perception for end-to-end ship hull inspection 

      Cardaillac, Alexandre (Doctoral theses at NTNU;2024:68, Doctoral thesis, 2024)
      This thesis presents an innovative and integrated solution for end-to-end underwater ship hull inspection using a small and low-cost Remotely Operated Vehicle (ROV). In a world where maritime activities have significant ...

    • Validation of ship manoeuvring simulation models 

      Gavrilin, Sergey (Doctoral theses at NTNU;2018:67, Doctoral thesis, 2018)
      During the last decades the application of ship simulation models for training of pilots, ship design, planning and construction of harbours and waterways, planning of complex marine operations and other engineering purposes ...

    • Vibration-Based Condition Monitoring of Drivetrains in Large Offshore Wind Turbines in a Digital Twin Perspective 

      Moghadam, Farid Khazaeli (Doctoral theses at NTNU;2021:109, Doctoral thesis, 2021)
      According to EU 2050 plan, offshore wind farms based on large floating wind turbines are considered as a main source of power supply in the coming future. Among the turbine systems, drivetrain contributes significantly in ...

    • Virtual Prototyping for Marine Crane Design and Operations 

      Chu, Yingguang (Doctoral theses;2018:10, Doctoral thesis, 2018)
      Marine crane system design is an interdisciplinary process involving such as mechanical design, kinematics, multi-body dynamics, hydraulics, and operational control-related tasks. Marine crane operations are inherently ...