• Model Based Early Kick/Loss Detection and Attenuation with Topside Sensing in Managed Pressure Drilling 

      Jinasena, Asanthi; Holta, Haavard H. F.; Jondahl, Morten Hansen; Welahettige, Prasanna Kumara Welahetti; Aamo, Ole Morten; Sharma, Roshan; Viumdal, Håkon; Lie, Bernt (Peer reviewed; Journal article, 2020)
      Early kick/loss detection is a crucial part of safe well control, and it plays a major role in the reduction of risk and non-productive time in drilling. In conventional drilling, topside sensing is used for early kick/loss ...
    • Model based flow measurement using venturi umes for return flow during drilling 

      Pirir, Ivan; Jinasena, Asanthi; Sharma, Roshan (Journal article; Peer reviewed, 2017)
      In an oil well drilling operation, a proper knowledge of the return fluid flowrate is necessary both for the stabilization of the bottom hole pressure of the well and also as a primary indication of a kick or loss. In ...
    • Model Predictive Control with Integral Action: A simple MPC algorithm 

      Di Ruscio, David Luigi (Journal article; Peer reviewed, 2013)
      A simple Model Predictive Control (MPC) algorithm of velocity (incremental) form is presented. The proposed MPC controller is insensitive to slowly varying system and measurement trends and therefore has integral action. ...
    • Model-free optimal anti-slug control of a well-pipeline-riser in the K-Spice/LedaFlow simulator 

      Dalen, Christer; Di Ruscio, David Luigi; Nilsen, Roar (Journal article; Peer reviewed, 2015)
      Simplified models are developed for a 3-phase well-pipeline-riser and tested together with a high fidelity dynamic model built in K-Spice and LedaFlow. These models are developed from a subspace algorithm, i.e. Deterministic ...
    • Model-Free PI/PID Controller Tuning of Higher Order Nonlinear Dynamic Systems 

      Dalen, Christer; Di Ruscio, David Luigi (Peer reviewed; Journal article, 2019)
      This paper concerns model-free PI/PID controller tuning of possible (nonlinear) higher order systems. The method can be considered as a three-step procedure. The first step is to persistently excite the system in open loop ...
    • Model-Free Predictive Anti-Slug Control of a Well-Pipeline-Riser 

      Dalen, Christer; Ruscio, David Luigi Di (Journal article; Peer reviewed, 2016)
      Simplified linearized discrete time dynamic state space models are developed for a 3-phase well-pipeline-riser and tested together with a high fidelity dynamic model built in K-Spice and LedaFlow. In addition the Meglio ...
    • modelica.university: A Platform for Interactive Modelica Content 

      Winkler, Dietmar; Tiller, Michael (Journal article; Peer reviewed, 2017)
      The World Wide Web was conceived of as a medium for the expression and exploration of scientific and engineering ideas. However, much of the innovation in web technologies is now focused on consumer facing applications. Although ...
    • Modeling and Analysis of Fluid Flow through A Non-Prismatic Open Channel with Application to Drilling 

      Jinasena, Asanthi; Ghaderi, Ali; Sharma, Roshan (Journal article; Peer reviewed, 2018)
      This paper presents the development and validation of a simplified dynamic model of a Venturi channel. The existing dynamic models on open channels are based on the open channel flow principles, which are the shallow water ...
    • Modeling and optimization of coolant channel cross sections in induction heating coils 

      Svendsen, Kjetil; Hagen, Svein Thore (Journal article; Peer reviewed, 2011)
      In induction heating applications where high currents and intermittent power application dominate, thermal fatigue can be a limiting factor of the service life of the induction coil. The outer geometry of the coil is often ...
    • Modeling and Simulation of A Multi-Zone Building for Better Control 

      Perera, Degurunnehalage Wathsala U.; Pfeiffer, Carlos Fernando; Skeie, Nils-Olav (Journal article; Peer reviewed, 2014-12-09)
      Buildings are one of the largest energy consumers in most of the countries. Building sector in the European Union (EU) is continuously expanding and currently utilizes 40% of total energy consumption in the union. Out of ...
    • Modeling and Simulation of Multi-Room Buildings 

      Perera, Degurunnehalage Wathsala U.; Skeie, Nils-Olav (Journal article; Peer reviewed, 2016)
      Buildings are one of the largest energy consumers in the world which accounts for nearly 40% of the total global energy consumption. In the countries where cold climate conditions predominate, space heating is the key ...
    • Modeling and Simulation of Triclosan Kinetics and Distribution in Humans Using a PBPK Model 

      Maharjan, Samee; Sharma, Roshan; Husøy, Trine; Dirven, Hubert; Andreassen, Monica; Lie, Bernt (Journal article; Peer reviewed, 2015-11-25)
      Personal care products (PCPs) such as soaps, perfumes, toothpastes, lotions, etc. contain various chemicals. Triclosan (TCS) is widely used as an antibacterial additive in PCPs. Traces of TCS are found in human plasma and ...
    • Modeling and Simulation of Triclosan Kinetics and Distribution in Humans Using PBPK Model 

      Cascella, Vincenza; Andreassen, Monica; Husøy, Trine; Dirven, Hubert; Lie, Bernt (Journal article; Peer reviewed, 2018)
      Triclosan (TCS) has been used as an antibacterial additive in several personal care products (PCPs) for more than 40 years. In animals studies, it is observed that TCS in rats has adverse effects on the endocrine function ...
    • Modeling for control of run-of-river power plant Grønvollsfoss 

      Vytvytskyi, Liubomyr; Sharma, Roshan; Granstrøm, Ingunn; Lie, Bernt (Journal article; Peer reviewed, 2015-11-25)
      Design of optimal operation and control of a run-of-river hydro power plant depends on good models for the elements of the plant. River reaches are often considered to be shallow channels with free surface flow. A typical ...
    • Modelling and control of a typical high head hydropower plant 

      Zhou, Wenjing; Lie, Bernt; Glemmestad, Bjørn (Conference object; Peer reviewed, 2011)
      This paper describes an effective mathematical model of a hydropower plant and how a decentralized control strategy for frequency and terminal voltage can be simulated. Several dynamic equations are presented for each ...
    • Modelling and control of collecting solar energy for heating houses in Norway 

      Dehghan, Mehran; Pfeiffer, Carlos Fernando (Journal article; Peer reviewed, 2017)
      In this research, a new model was developed and modified with a combined solar heating system which works with solar radiation and electricity. In order to model the system, the outdoor temperature of the location and solar ...
    • Modelling of a Hydro Power Station in an Island Operation 

      Winkler, Dietmar; Magnúsdóttir, Arndís (Journal article; Peer reviewed, 2017)
      There is a strong focus on new renewable energy sources, such as, solar power, wind energy and biomass, in the con-text of reducing carbon emissions. Because of its maturity, hydropower is often overlooked. However, there ...
    • Modelling of Water Levels in a Reservoir using Modelica 

      Meijer, Willem; Winkler, Dietmar (Journal article; Peer reviewed, 2020)
      The regulation of hydro power plants is influenced by amongst others reservoir capacity and the knowledge about how it is influenced by changes in in- and out?ow. The hydro power reservoir Aurdalsfjord has a small capacity ...
    • Modelling the heat dynamics of a residential building unit: Application to Norwegian buildings. 

      Perera, Degurunnehalage Wathsala U.; Pfeiffer, Carlos Fernando; Skeie, Nils-Olav (Journal article; Peer reviewed, 2014)
      The paper refers to the development of a continuous time mathematical heating model for a building unit based on the rst principles. The model is described in terms of the state space variables, and a lumped parameter ...
    • Modelling the synchronisation control for a hydro power controller 

      Hellborg, Jonatan; Tollefsen, Tonje; Bhusal, Khemraj; Winkler, Dietmar (Peer reviewed; Journal article, 2021)
      This paper presents the modelling of a synchronisation control as used inside a typical hydro power controller for small hydro power plants. It was built using the open-source modelling language Modelica by use of the ...