Browsing NTNU Open by Author "Tengesdal, Njål Kjærnes"
Now showing items 1-3 of 3
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Component-Based Modeling and Simulation of Nonlinear Drill-String Dynamics
Tengesdal, Njål Kjærnes; Holden, Christian; Pedersen, Eilif (Chapter, 2019)In this paper, we present a dynamic model for a generic drill-string. The model is developed with the intention for component-based simulation with coupling to external subsystems. The performance of the drill-string is ... -
Identification and Optimal Control for Surge and Swab Pressure Reduction While Performing Offshore Drilling Operations
Tengesdal, Njål Kjærnes; Holden, Christian (Peer reviewed; Journal article, 2020)In this paper, an unscented Kalman filter (UKF) coupled with a nonlinear model-predictive controller (NMPC) for a hydraulic wellbore model with multi-variable control and tracking is presented. In a wellbore, high drill ... -
Modelling and Simulation of Offshore Drilling Systems
Tengesdal, Njål Kjærnes (Doctoral theses at NTNU;2021:324, Doctoral thesis, 2021)This thesis presents the results of applying modelling theory, estimation, and control for the efficient formulation of drilling system models for real-time implementation and analysis. Together with modern sensor devices, ...