Blar i NTNU Open på forfatter "Larsen, Carl Martin"

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    • Advances in semi-empirical time domain modelling of vortex-induced vibrations 

      Ulveseter, Jan Vidar (Doctoral theses at NTNU;2018:135, Doctoral thesis, 2018)
      Most of today’s prediction tools for vortex-induced vibrations (VIV) operate in the frequency domain, where analysis is restricted to linear systems and steady flows. These modelling limitations provide an unsatisfactory ...

    • Analysis of Drift-off During Drilling on Deep Water 

      Gao, Ke (Master thesis, 2015)
      For drilling operation in the deepwater, dynamic positioning system is used for platform to main the position. In case drift off (positioning system don t function), the drilling system might be damaged before an emergency ...

    • Analysis of Low-Frequency Damping in Mooring Lines for Floating Production Units 

      Magnussen, Eivind Tørset (Master thesis, 2014)
      In this thesis, the relationship between mooring line damping and system responses, due to varying environmental conditions, is investigated. The responses focus mainly on the low-frequency (LF) components and on the ...

    • Analysis of Motions and Anchor Line Forces for Floating Production Units 

      Ebbesen, Cathrine (Master thesis, 2013)
      The oil industry is expanding its activities into deeper and deeper waters. This creates new challenges in terms of technology and design of floating production units. Floater, mooring lines and risers comprise a dynamic ...

    • Assessment of Uncertainties in Estimated Wellhead Fatigue 

      Hegseth, John Marius (Master thesis, 2014)
      During subsea drilling, the motions of the Mobile Offshore Drilling Unit (MODU) and riser cause cyclic bending moments on the wellhead. This may lead to fatigue failure of the component, which can have severe consequences, ...

    • DESIGN AND ANALYSIS OF TENSION LEG ANCHOR SYSTEMS FOR FLOATING WINDMILLS 

      Sachithanathamoorthy, Kumaravalavan (Master thesis, 2012)
      Increasing demand for clean and effective energy production turns interests of the world on floating offshore wind technology. To establish floating wind farms, a wind turbine have to be mound on a floating structure. The ...

    • Design av flytende vindturbin - Responseundersøkelse av TLP-forankret konstruksjon 

      Moldenhagen, Sindre Jin S (Master thesis, 2015)
      Den globale satsing på fornybar energi har gjort det interessant å undersøke flytende offshore vindturbiner lenger ut til havs der vindforholdene ofte er mer gunstige og stabile. Det har allerede blitt installert flere ...

    • Design storm analysis simplification study for flexlay installation systems 

      Kjønsøy, Øyvind Austbø (Master thesis, 2013)
      When doing installation analysis of flexible pipe systems one has to do dynamical analysis. The goal of said analysis is to find the limiting sea states that various operations or installations can take place in. To do ...

    • DISCONNECTION OF WORKOVER RISERS ON VERY DEEP WATER 

      Brynestad, Benjamin Ingvaldsen (Master thesis, 2012)
      for advanced riser analysis. Deep water oil recovery have forced a change in thesystems used to tension risers, the traditional wire-pulley systems are replacedwith direct acting hydraulic-pneumatic systems. In order to ...

    • Dominant parameters for vortex-induced vibration of a steel catenary riser under vessel motion 

      Wang, Jungao; Fu, Shixiao; Larsen, Carl Martin; Baarholm, Rolf; Wu, Jie; Lie, Halvor (Journal article; Peer reviewed, 2017)
      Recent research has confirmed a new type of vortex-induced vibration (VIV) in steel catenary risers (SCRs), purely caused by vessel motion. Vessel motion-induced VIV occurs because the SCR is exposed to the equivalent ...

    • Dynamic Analysis and Design of Mooring Lines 

      Chrolenko, Michael Olivier (Master thesis, 2013)
      This master thesis presents a comparison study, where the main focus has been to assess if simplified methods can be used for analysing mooring lines for a turret moored FPSO in shallow waters. The MIMOSA program applies ...

    • DYNAMIC ANALYSIS OF WORKOVER RISER UNDER UNEXPECTED CONDITIONS 

      Hermanrud, Lars (Master thesis, 2014)
      The oil and gas business will meet new economical and technical challenges in the future. Increasing water depths and a decreasing number of new findings lead to a demand for higher recovery rates. Workover systems are ...

    • Dynamic Simulation of Module Installation on Deep Water 

      Pedersen, Joar (Master thesis, 2015)
      The Aasta Hansteen field is a gas field outside the coast of Northern Norway. Production is planned to start in 2017. The gas field is situated at 1300m water depth the deepest on the Norwegian continental shelf. During ...

    • Dynamic Ssimulation Of Dart Anchor Installation 

      Landhaug, Daniel L (Master thesis, 2015)
      Over the few last decades, numerous mooring concepts have been developed, one of these being the dart/ torpedo anchor. A torpedo anchor is shaped like an arrow and is equipped with tail fins to provide good directional and ...

    • Fatigue Analysis of Mooring Lines on the Floating Wind Turbine Hywind Demo 

      Homb, Hans Ranøyen (Master thesis, 2013)
      In the last decades the focus on developing renewable energy has increased tremendously. The main reason for this is the rapid increase of population, which requires enormous amounts of energy. Eventually we will run out ...

    • Flexible Pipes: Slug Flow and Structure Coupling 

      Medina, Joaquín José Vieiro (Doctoral theses;2018:317, Doctoral thesis, 2018)
      In this thesis, a computational scheme for coupled internal multiphase flow and structural dynamic of flexible pipes is presented and tested. The model consists of a 1D simulator based on a slug tracking model, and a 3D ...

    • Global Analysis of a Floating Bridge 

      Pedersen, Christopher S (Master thesis, 2013)
      There is an ongoing political debate in Norway concerning how to improve the communication between communities on the western coastline. A proposed solution is to build floating bridges over some of the crossings that today ...

    • Global Analysis of a Shipping Lane for a Floating Bridge 

      Johnsen, Jørn Magnus (Master thesis, 2015)
      The main objective of this thesis is to conduct a global analysis of a proposed shipping lane for a floating bridge that in future will operate in Halsafjorden. The model is simplified as only the shipping lane will be ...

    • Higher Order Frequency Component in VIV 

      Huang, Yankang (Master thesis, 2014)
      There are still quite a lot unknown and unexplainable territories in hydrodynamic field. VIV is one of them. In today s industry world, existence of uncertainty in VIV prediction program attracts much attention.In this ...

    • Higher Order Loads from Steep Waves on Drilling Risers 

      Sture, Balder Een (Master thesis, 2013)
      Drilling operations are conducted in increasingly harsher environments as the easily accessible oil fields are growing scarce. Marine drilling risers are exposed to large hydrodynamic forces in the splash zone. Higher order ...