Blar i Institutt for marin teknikk på tittel

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    • Reducing GHG emissions in Shipping - measures and options 

      Lindstad, Elizabeth; Bø, Torstein Ingebrigtsen; Eskeland, Gunnar (Chapter, 2018)
      CO2 emissions from maritime transport represent around 3% of total anthropogenic CO2 emissions. These emissions are assumed to increase by 50% to 250% up to 2050 in business-as-usual scenarios with a tripling of world ...

    • Reducing power transients in diesel-electric dynamically positioned ships using re-positioning 

      Veksler, Aleksander Vladimirovitsj; Johansen, Tor Arne; Skjetne, Roger; Mathiesen, Eirik (Journal article, 2014)
      A thrust allocation method with a functionality to assist power management systems by using the hull of the ship as a store of potential energy in the field of environmental forces has been recently proposed and demonstrated ...

    • Reducing the number of individuals to monitor shoaling fish systems - Application of the Shannon entropy to construct a biological warning system model 

      Eguiraun, Harkaitz; Casquero, Oskar; Sørensen, Asgeir Johan; Martinez, Iciar (Journal article; Peer reviewed, 2018)
      The present study aims at identifying the lowest number of fish (European seabass) that could be used for monitoring and/or experimental purposes in small-scale fish facilities by quantifying the effect that the number of ...

    • Reducing the probability of ship grounding: Which measure to undertake? 

      Akhtar, Juned; Utne, Ingrid Bouwer (Journal article; Peer reviewed, 2014)
      The analytic hierarchy process has been used to elicit the knowledge of maritime transport stakeholders, such as seafarers, authorities, insurers and academics, regarding human factors and risk-reducing measures for ship ...

    • Reducing uncertainty of Monte Carlo estimated fatigue damage in offshore wind turbines using FORM 

      Horn, Jan-Tore H.; Jensen, Jørgen Juncher (Chapter, 2016)
      Uncertainties related to fatigue damage estimation of non-linear systems are highly dependent on the tail behaviour and extreme values of the stress range distribution. By using a combination of the First Order Reliability ...

    • Reduction of maritime GHG emissions and the potential role of E-fuels 

      Lindstad, Elizabeth; Lagemann, Benjamin; Rialland, Agathe Isabelle; Gamlem, Gunnar Malm; Valland, Anders (Peer reviewed; Journal article, 2021)
      Maritime transport accounts for around 3% of global anthropogenic Greenhouse gas (GHG) emissions (Well-to-Wake) and these emissions must be reduced with at least 50% in absolute values by 2050, to contribute to the ambitions ...

    • Reduction of trawl impact loads on pipelines resting exposed on the seabed 

      Krogstadmo, Truls Wanvik (Master thesis, 2019)
      I dag finnes havbunnsinstallasjoner rundt omkring i Nordsjøen og Barentshavet med rørledninger som strekker seg totalt over 8800 kilometer på norsk sokkel. Rørledninger eksisterer rundt offshore-anlegget og er koblet til ...

    • REGENERATION IN CRANE OPERATIONS 

      Øksnes, Jan Olav (Master thesis, 2017)
      In this thesis a marine power plant with a battery pack has been modeled using bond graph theory, using the bond graph simulation software 20-sim. The popularity of hybrid power systems are increasing in the marine sector, ...

    • Reinforcement Learning for Autodocking of Surface Vessels 

      Mothes, Brage Elias West (Master thesis, 2019)
      Denne avhandlingen presenterer et studie av maskinlæring (ML) anvendt i maritim sammenheng. Mer spesifikt har forsterkende læring (FL), som et handlings-planleggende lag for veiledning i et dokningsscenario blitt inspisert. ...

    • Relative Motion Calculator 

      Berg, Eirik (Master thesis, 2012)
      AbstractThe wind power business has in recent times changed its focus from land-based installations to offshore installations. This has presented challenges both technological and financial, mainly related to construction ...

    • The relevance of recoil and free swimming in aquatic locomotion 

      Paniccia, Damiano; Graziani, G.; Lugni, Claudio; Piva, Renzo (Peer reviewed; Journal article, 2021)
      The study of the free swimming of undulating bodies in an otherwise quiescent fluid has always encountered serious difficulties for several reasons. When considering the full system, given by the body and the unbounded ...

    • Reliability Analysis for Physically Separated Redundant System 

      Kim, HyungJu; Haugen, Stein; Utne, Ingrid Bouwer (Chapter, 2017)
      Redundancy has been a key concept to achieve high system reliability in technical systems, and the concept is central in modern technology regulations. One important aspect of successful redundancy is independence of the ...

    • Reliability Analysis of Blowout Preventer Systems: A comparative study of electro-hydraulic vs. all-electric BOP technology 

      Drægebø, Elisabeth (Master thesis, 2014)
      A blowout preventer (BOP) is a large valve used to seal, control and monitor oil and gas wells. It serves as an important barrier against blowouts. Excessive downtime on the BOP is a problem for drilling companies worldwide, ...

    • Reliability Analysis of Crack Growth Occurrence for a Secondary Hull Component due to Vibration Excitation 

      Kleivane, Siri Kolle; Leira, Bernt Johan; Steen, Sverre (Peer reviewed; Journal article, 2024)
      Ship hull vibration is a significant contributor to fatigue crack growth and the major sources of vibrations are found to be the main engine vibration excitation, the wave-induced springing and whipping loads, and the ...

    • Reliability Analysis of Crack Growth Occurrence for a Secondary Structural Component due to Vibration Excitation 

      Kleivane, Siri Kolle; Leira, Bernt Johan; Steen, Sverre (Chapter, 2023)
      Ship hull vibration is a significant contributor to fatigue crack growth and the major sources of vibrations are found to be the main engine vibration excitation, the wave-induced springing and whipping loads, and the ...

    • Reliability Analysis of Shore-to-Ship Fast Charging Systems 

      Karimi, Siamak; Zadeh, Mehdi; Suul, Jon Are Wold; Thieme, Christoph Alexander (Chapter, 2021)
      This paper presents a reliability assessment of Shore-to-Ship Sharging (S2SC) systems with focus on the two most common topologies of ac and dc charging. In the proposed reliability model, the Markov chain and reliability ...

    • Reliability analysis of wake-induced collision of flexible risers 

      Fu, Ping; Leira, Bernt Johan; Myrhaug, Dag (Journal article; Peer reviewed, 2017)
      Collision between risers is an important design and operational concern, especially in deep water since the probability of collision tends to increase as the riser length increases. Riser collision is due to the joint ...

    • Reliability Analysis of Wake-induced Riser Collision 

      Fu, Ping (Doctoral theses at NTNU;2019:91, Doctoral thesis, 2019)
      Reliability-based design of a riser array requires accurate estimation of extremes of the stochastic relative motion process between pairs of risers in order to avoid collision. Hydrodynamic interference is considered to ...

    • Reliability and Maintenance Analysis of Marine Hybrid Power and Propulsion Systems 

      Wang, Ziwen (Master thesis, 2023)
      This thesis aims to provide a reliability and maintenance analysis of marine hybrid power systems and figure out the effect of vessel operation contexts and system redundancies. The Multi-phase Markov method is implemented ...

    • Reliability assessment of a bridge structure subjected to chloride attack 

      Leira, Bernt Johan; Thons, Sebastian; Faber, Michael H (Journal article; Peer reviewed, 2018)
      Prediction of the service lifetime of concrete structures with respect to chloride ingress involves a number of parameters that are associated with large uncertainties. Hence, full-scale measurements are strongly in demand. ...