Browsing NTNU Open by Title

Now showing items 25150-25169 of 103133

    • Dynamic Behavior of Reversible Pump-Turbines in Turbine Mode of Operation 

      Walseth, Eve Cathrin (Doctoral theses at NTNU;2016:202, Doctoral thesis, 2016)
      Reversible pump-turbines, with their steep and s-shaped characteristics, have proven throughout history to be a challenge with regards to both stability and transients. The aim of this thesis is to increase our understanding ...

    • Dynamic behavior of subsea wellhead and shallow pipe under seismic action 

      Liu, Yuhan; Fan, Honghai; Sævik, Svein; Leira, Bernt Johan (Peer reviewed; Journal article, 2022)
      The interaction between shallow pipe and soil near the subsea wellhead is an important factor in the maintenance of subsea wellhead stability. First, a seismic test was conducted. A shaking table and a shear model box were ...

    • Dynamic Behaviour Comparison of a 10-MW Drivetrain in a Bottom-Fixed Monopile and a Spar Floating Wind Turbines 

      Wang, Shuaishuai; Rasekhi Nejad, Amir; Moan, Torgeir (Chapter, 2020)
      Up to now, very little attentions have been paid to multi-megawatt off shore wind turbine drivetrains. In order to improve the reliability of the offshore wind turbine drivetrain, a better understanding of its dynamic ...

    • Dynamic Behaviour of a High-Strength Structural Steel at Low Temperatures 

      Perez-Martin, Maria Jesus; Holmen, Jens Kristian; Thomesen, Susanne; Hopperstad, Odd Sture; Børvik, Tore (Journal article; Peer reviewed, 2019)
      The main objective of this experimental study is to determine the effect of low temperatures on the mechanical behaviour of Strenx 960 Plus high-strength structural steel at different strain rates and stress triaxialities. ...

    • Dynamic behaviour of aluminium alloy plates with surface cracks subjected to repeated impacts 

      Duan, Fangjuan; Liu, Jingxi; Wang, Ge; Yu, Zhaolong (Journal article, 2018)
      This paper investigates the behaviour of aluminium alloy plates with and without initial cracks under repeated impacts. Three series of impact tests were conducted to study the behaviour of circular plate that do not have ...

    • Dynamic behaviour of an HMR pre-combustion gas power cycle 

      Zhao, Lei; Michelsen, Finn Are; Foss, Bjarne Anton; Aasen, Knut I (Journal article; Peer reviewed, 2010)
      This paper explores dynamics for control design of a Hydrogen Membrane Reformer (HMR) pre-combustion gas power cycle. For this type of reforming to be competitive to power generation with carbon ...

    • Dynamic behaviour of anchor handling vessels during anchor deployment 

      Wu, Xiaopeng; Moan, Torgeir (Journal article; Peer reviewed, 2017)
      Anchor handling operation (AHO) is potentially hazardous, as for instance demonstrated by the Bourbon Dolphin accident in 2007. Although the accident has been studied by various parties, there has been limited focus on the ...

    • Dynamic behaviour of cablesupported bridges subjected to strong natural wind 

      Øiseth, Ole Andre (Doktoravhandlinger ved NTNU, 1503-8181; 2011:315, Doctoral thesis, 2011)
      This thesis discusses wind-induced dynamic response of slender cable-supported bridges. The focus has been on prediction of the flutter stability limit and the buffeting response in strong winds. The thesis consists of ...

    • Dynamic behaviour of existing and new railway catenary systems under Norwegian conditions 

      Nåvik, Petter Røe (Doctoral theses at NTNU;2016:298, Doctoral thesis, 2016)
      This thesis concerns the dynamic behaviour of railway catenary systems, particularly Norwegian systems. The aim of this PhD study is to increase the knowledge of the dynamic behaviour of these systems. This includes analyses ...

    • Dynamic behaviour of floating bridges exposed to wave excitation A numerical and experimental investigation 

      Kvåle, Knut Andreas (Doctoral theses at NTNU;2017:365, Doctoral thesis, 2017)
      By utilizing the buoyancy of the water in a crossing, floating bridges may provide permanent road links where other bridge types would be impossible or too costly to build. Still, floating bridges are not wide-spread in ...

    • Dynamic behaviour of fuel cells 

      Weydahl, Helge (Doktoravhandlinger ved NTNU, 1503-8181; 2006:94, Doctoral thesis, 2006)
      This thesis addresses the dynamic behaviour of proton exchange membrane fuel cells (PEMFCs) and alkaline fuel cells (AFCs). For successful implementation in automotive vehicles and other applications with rapidly varying ...

    • Dynamic behaviour of multistorey timber buildings 

      Stub, Marit (Master thesis, 2009)

    • Dynamic behaviour of synchronous machine during open conductor fault - - modeling, simulations and laboratory experiments 

      Røste, Hans Olav (Master thesis, 2015)
      The topic of this master thesis deal with stability issues in the hydro power plant Nedre Fiskumfoss Kraftverk (NFK) where speed and power oscillations occurred in the synchronous generators after an open conductor fault ...

    • Dynamic bending of an ice wedge resting on a winkler-type elastic foundation 

      Kim, Jeonghwan; Lu, Wenjun; Lubbad, Raed; Løset, Sveinung; Jang, Beom-Seon (Journal article; Peer reviewed, 2022)
      For most ice – sloping structure interactions, the incoming ice floes' failures are determined by the formation of circumferential cracks. This physical process can be simplified as analyzing the bending failure of an ice ...

    • Dynamic Bias for RF Class A Power Amplifiers 

      Caharija, Walter (Master thesis, 2009)
      This thesis focuses on class A radio frequency power amplifiers in dynamic supply modulation architectures (dynamic bias). These are promising efficiency enhancement techniques where the device is driven harder by varying ...

    • Dynamic biasing for linear power amplifier efficiency enhancement 

      Medina, Juan Felipe Miranda (Doktoravhandlinger ved NTNU, 1503-8181; 2012:277, Doctoral thesis, 2012)
      Spectrum is an indispensable and scarce resource in modern communication systems. Reduced hardware complexity is therefore traded for bandwidth-efficient modulation that increases the signal’s peak-to-average power ratio ...

    • Dynamic Bloom Filters in Cassandra DB 

      Solberg, Tiril Merethe Kyrkjeeide (Master thesis, 2020)
      Denne masteroppgaven undersøker en mye brukt distribuert database, Cassandra. Cassandra ble først utviklet av Facebook, men administreres nå av Apache-stiftelsen, og er tilgjengelig som åpen kildekode. NoSQL-databasen ...

    • A Dynamic Bonus System to Increase Player Participation in Pervasive Learning Games. 

      Pløhn, Trygve; Iversen, Kjærand; Aalberg, Trond (Peer reviewed; Journal article, 2020)
      A pervasive game blends gaming with the real world and makes the experience pervasive according to the players’ everyday life. Pervasive games typically last for days or weeks and have successfully been used within advertising ...

    • Dynamic buckling of end anchored floating bridges 

      Østby, Ingvild Kristine Haug; Storheim, Ørjan (Master thesis, 2018)
      The Bjørnafjord bridge is a floating bridge planned to be a part of The Norwegian Public Roads Administrations ferry-free road project along E39. This thesis looks into the dynamic behavior of this bridge, focusing of ...

    • Dynamic buckling of marine structures 

      Straume, Jonas Gullaksen (Master thesis, 2014)
      In this report the buckling resistance of marine structures when dynamic effects is important is investigated. A review of the governing theory is presented for both beam and plates. A sample of the different ways of solving ...