Recent Submissions

  • Mathematical modelling of mass transfer of paramagnetic ions through an inert membrane by the transient magnetic concentration gradient force. https:// 

    Svendsen, John Arild; Waskaas, Magne (Peer reviewed; Journal article, 2020)
    The objective of this work is to suggest a mathematical model for mass-transfer of a paramagnetic electrolyte, nickel(ii)chloride solution, through an inert, thin membrane from one chamber to another under the influence ...
  • Interleaved high gain DC-DC converter for integrating solar PV source to DC bus 

    Sri Revathi, B; Mahalingam, Prabhakar; Gonzalez-Longatt, Francisco (Peer reviewed; Journal article, 2019)
    In this paper, a novel non-isolated DC-DC converter topology is proposed for solar photovoltaic (PV) application. The proposed converter is constructed from an interleaved boost converter (IBC) to reduce the input current ...
  • On the Optimization of Damping Enhancement in a Power System with a Hybrid HVDC Link 

    Chamorro, Harold; Torkzadeh, Roozbeh; Kotb, Omar; Rouzbehi, Kumars; Escaño, Juan Manuel; Gonzalez-Longatt, Francisco; Bellmunt, Oriol Gomis; Toma, Lucian; Sood, Vijay K (Chapter, 2019)
    Hybrid HVDC links incorporate both Line Commutated Converters (LCC) and Voltage Source Converters (VSC) systems, thereby gathering the benefits of both technologies. Supplementary Power Oscillation Damping (POD) controllers ...
  • Reactive Power Control of Grid Interactive Battery Energy Storage System for WADC 

    Torkzadeh, Roozbeh; Chamorro, Harold; Rye, Rebecca; Eliassi, Mojtaba; Toma, Lucian; Gonzalez-Longatt, Francisco (Chapter, 2019)
    The integration of Grid Interactive Battery Energy Storage Systems (GI-BESSs) in energy services, such as peak shaving and load balancing, is a common practice in the modern-day electric power system. However, it is essential ...
  • Entrepreneurship Education for Engineering Students – A Survey of Former Students’ Self-Employment and Market Attraction 

    Hasleberg, Harald; Voldsund, Kari Håvåg; Hagen, Svein Thore (Journal article; Peer reviewed, 2019)
    Engineering students will meet a working life with great expectations and demands of creativity, innovation, and entrepreneurial skills. They will need to demonstrate abilities like business knowledge, management, marketing, ...
  • Work Placement in Higher Education – Bridging the Gap between Theory and Practice 

    Immerstein, Robert; Hasleberg, Harald; Bråthen, Terje (Peer reviewed; Journal article, 2019)
    During the engineering education, the focus is on theoretical knowledge and less on the practical competence to be a professional engineer. To lead higher education into the future, it is critical to develop models and ...
  • Computational Fluid Dynamics Study of Shear Thinning Fluid (Drilling Fluid) Viscosity Models in an Open Venturi Channel 

    Welahettige, Prasanna Kumara Welahetti; Lie, Bernt; Vågsæther, Knut (Journal article; Peer reviewed, 2019)
    We aim to develop an improved kick/loss detection technology by developing smart flow-sensor technology for returned flow from the oil well in open Venturi channels. This is a detailed study about a capacity of use of ...
  • A Real-Time Flow-Measuring Algorithm for Open Venturi Channel Non-Newtonian Flow 

    Welahettige, Prasanna Kumara Welahetti; Lie, Bernt; Vågsæther, Knut (Peer reviewed; Journal article, 2019)
    A real-time flow measuring algorithm is developed for the open Venturi channel non-Newtonian flow measurement. Using a single level sensor reading at downstream of the open Venturi channel, a drilling-well return flow rate ...
  • Quantitative genetics state-space modeling of phenotypic plasticity and evolution 

    Ergon, Rolf Otto Torbjørn (Peer reviewed; Journal article, 2019)
    Living organisms adapt to changes in environment by phenotypic plasticity and evolution by natural selection (or they migrate). At detailed genetic levels these phenomena are complicated, and quantitative genetics attempts ...
  • Alumina scale composition and growth rate in distribution pipes 

    Haugland, Ingrid Bokn; Kjos, Ole Sigmund; Røyset, Arne Karstein; Vullum, Per Erik; Aarhaug, Thor Anders; Halstensen, Maths (Peer reviewed; Journal article, 2019)
    Scaling in distribution pipes for secondary alumina is a major issue in aluminium smelters. The scale is formed inside the distribution pipes, and gradually reduces the cross section that is available for alumina transport. ...
  • Nonlinear observer for hydropower system 

    Vytvytskyi, Liubomyr; Sharma, Roshan; Lie, Bernt (Peer reviewed; Journal article, 2019)
    Estimation of unmeasured states plays an essential role in the design of control systems as well as for monitoring of hydropower plants. The standard Kalman filter gives the optimum state estimates for linear systems. ...
  • One-dimensional model of turbulent flow of non-Newtonian drilling mud in non-prismatic channels 

    Welahettige, Prasanna Kumara Welahetti; Lundberg, Joachim; Bjerketvedt, Dag; Lie, Bernt; Vågsæther, Knut (Peer reviewed; Journal article, 2019)
    One-dimensional model of non-Newtonian turbulent flow in a non-prismatic channel is challenging due to the difficulty of accurately accounting for flow properties in the 1-D model. In this study, we model the 1-D Saint–Venant ...
  • OpenHPL for Modelling the Trollheim Hydropower Plant 

    Vytvytskyi, Liubomyr; Lie, Bernt (Peer reviewed; Journal article, 2019)
    An increase of tightly integrated, renewable energy sources with highly varying production leads to a greater need for flexible hydropower plants to “balance” the intermittent production from these sources. From a systems ...
  • Combining measurements with models for superior information in hydropower plants 

    Vytvytskyi, Liubomyr; Lie, Bernt (Peer reviewed; Journal article, 2019)
    Water flow and pressure measurements play essential roles in the operation of hydropower plants. For all methods of measuring flow and pressure, there is a level of uncertainty with regards to sensor noise and sensor ...
  • Computational Fluid Dynamics Study of the Effects of Drill Cuttings on the Open Channel Flow 

    Welahettige, Prasanna Kumara Welahetti; Berg, Christian; Lundberg, Joachim; Lie, Bernt; Vågsæther, Knut (Peer reviewed; Journal article, 2019)
    A three-dimensional computational fluid dynamics (CFD) study was carried out for drilling fluid flow with drill cuttings in open channels. The flow is similar to the return flow when drilling, stream containing drilling ...
  • OMJulia: An OpenModelica API for Julia-Modelica Interaction 

    Lie, Bernt; Palanisamy, Anandhakumar; Mengist, Alachew; Buffoni, Lena; Sjölund, Martin; Asghar, Adeel; Pop, Adrian; Fritzson, Peter (Peer reviewed; Journal article, 2019)
    Modelica is an object oriented, acausal equation-based language for describing complex, hybrid dynamic models. About ten Modelica implementations exist, of which most are commercial and two are open source; the implementations ...
  • Controller Design for a Magnetic Levitation Kit using OpenModelica’s Integration with the Julia Language 

    Thiele, Bernhard; Lie, Bernt; Sjölund, Martin; Pop, Adrian; Fritzson, Peter (Peer reviewed; Journal article, 2019)
    This paper presents a practical application of computer aided control systems design using a new OpenModelica API (OMJulia) which allows to conveniently operate on Modelica models from the Julia language. Julia is a rather ...
  • Structural analysis in Julia for dynamic systems in OpenModelica 

    Vytvytskyi, Liubomyr; Lie, Bernt (Peer reviewed; Journal article, 2019)
    In control theory for dynamic systems, the information about observability and controllability of states plays a key role to evaluate the possibility to observe states from outputs, and use inputs to move states to a desired ...
  • Surrogate and Hybrid Models for Control 

    Lie, Bernt (Peer reviewed; Journal article, 2019)
    With access to fast computers and efficient machine learning tools, it is of interest to use machine learning to develop surrogate models from complex physics-based models. Next, a hybrid model is a combination model where ...
  • Flood Management of Lake Toke: MPC Operation under Uncertainty 

    Menchacatorre, Itsaso; Sharma, Roshan; Furenes, Beathe; Lie, Bernt (Peer reviewed; Journal article, 2019)
    A deterministic reference tracking model predictive control (MPC) is in use at Skagerak Kraft for flood management of Lake Toke in Norway. An operational inflow estimate is used to predict the optimal gate opening at Dalsfos ...

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