Blar i NTNU Open på forfatter "Tengesdal, Njål Kjærnes"
-
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 ...