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Orbital Stabilization of Nonlinear Underactuated Systems
(Doctoral theses at NTNU;2022:353, Doctoral thesis, 2022)Orbital stabilization is a particular form of set stabilization, where the control objective is to induce, via time-invariant state-feedback, an asymptotically stable orbit in the resulting closed-loop system. Here an orbit ... -
Oscillation analysis of low-voltage distribution systems with high penetration of photovoltaic generation
(Peer reviewed; Journal article, 2020)The use of renewable power generation brings new challenges related to power quality issues. Furthermore, with the changing power system nature due to the presence of new components such as power electronics in large numbers ... -
OT and IT-architecture -functionality and design for health 4.0
(Master thesis, 2020)Ved datainnsamling må dataene leveres i et format som er lesbart for både menneske og maskin. Med økt datamengde i helse fra forskjellige systemer, er både datakvalitet en viktig parameter for å videreformidle informasjonen Denne ... -
Outdoor Navigation Using Bluetooth Angle-of-Arrival Measurements
(Journal article; Peer reviewed, 2022) -
Outlier Rejection for GNSS-aided Inertial Navigation
(Master thesis, 2017)Motivated by the importance of accurate measurements in navigation-applications, this thesis presents the implementation of an algorithm utilizing the estimated uncertainty from a Kalman filter to determine the quality of ... -
Outline of a System for Integrated Adaptive Ice Tracking and Multi-Agent Path Planning
(Chapter; Peer reviewed, 2017)In polar region operations, drift sea ice positioning and tracking is useful for both scientific and safety reasons. Modeling ice movements has proven difficult, not least due to the lack of information of currents and ... -
Output feedback boundary control of 2x2 semilinear hyperbolic systems
(Journal article; Peer reviewed, 2017)We consider the control and state estimation of a class of 2x2 semilinear hyperbolic systems with actuation and sensing collocated at one boundary. Our approach exploits the dynamics on the characteristic lines of the ... -
Output feedback boundary control of heterodirectional semilinear hyperbolic systems
(Peer reviewed; Journal article, 2020)We solve the problem of stabilizing a general class of 1-d semilinear hyperbolic systems with an arbitrary number of states convecting in each direction and with the actuation and sensing restricted to one boundary. The ... -
Output feedback boundary control of series interconnections of 2 x 2 semilinear hyperbolic systems
(Journal article; Peer reviewed, 2017)In this paper, we present an output feedback controller for systems consisting of n 2 × 2 semilinear hyperbolic systems in series interconnection where actuation and sensing are restricted to one boundary. The output-feedback ... -
Output feedback stochastic nonlinear model predictive control for batch processes
(Journal article; Peer reviewed, 2019)Batch processes play a vital role in the chemical industry, but are difficult to control due to highly nonlinear behaviour and unsteady state operation. Nonlinear model predictive control (NMPC) is therefore one of the few ... -
Output feedback stochastic nonlinear model predictive control of a polymerization batch process
(Chapter; Peer reviewed, 2019)Nonlinear model predictive control (NMPC) is one of the few methods that can handle multivariate nonlinear control problems while accounting for process constraints. Many dynamic models are however affected by significant ... -
Output Maneuvering for Cartesian 3D Printer
(Chapter, 2021)3D printing, also known as additive manufacturing, is a production technique that can create highly customized parts and is therefore ideal for product prototyping and customized orders. An important aspect of 3D printer ... -
Overvåking av tilstand og sikkerhet for ubemannede skip
(Master thesis, 2022)Autonome og ubemannede skip har fått mye oppmerksomhet de siste årene, og interessen for å realisere denne typen skip er sterkt økende. Årsakene til dette er at man blant annet kan øke sikkerheten og produktiviteten, samt ... -
Overvåking og kontroll av miljøvariabler i båt, camping eller hytte ved hjelp av BLE-enheter
(Master thesis, 2018)Denne oppgaven beskriver prosessen med å designe og delvis produsere et system for fjernstyrt overvåking og kontroll av enkelte miljøvariabler, som for eksempel temperatur, i hus, hytte, båt og liknende. Det designes et ... -
P-HiL Evaluation of Virtual Inertia Support to the Nordic Power System by an HVDC Terminal
(Chapter, 2020)This paper provides an assessment of the effect from virtual inertia provided by an HVDC converter terminal on the Nordic power system. The analysis is based on results from Power-Hardware-in-the-Loop (P-HiL) tests with a ... -
A Painless Deterministic Policy Gradient Method for Learning-based MPC
(Chapter, 2023)The combination of Reinforcement Learning (RL) and Model Predictive Control (MPC) has gained a lot of interest in the recent literature as a way of computing the optimal policies from MPC schemes based on inaccurate models. ... -
Parameter Estimation and Control of a Dual Gradient Managed Pressure Drilling System
(Master thesis, 2009)The increasing demand for oil and gas in the world, and the fact that most of the easily accessible reservoirs are in production or already abandoned, result in a need to develop new resources. These may be new reservoirs ... -
Parameter estimation for estimation of bottom hole pressure during drilling.
(Master thesis, 2009)In this thesis we examine four bottom hole pressure estimators based on adaptive estimation of the friction pressure for the drill string and the annulus. Knowledge about the bottom hole pressure is crucial to achieve ... -
Parameter Estimation in Atomic Force Microscopy: Nanomechanical Properties and High-speed Demodulation
(Doctoral theses at NTNU;2018:146, Doctoral thesis, 2018)Atomic force microscopy (AFM) has become a key enabling technology for high-precision study of materials and biological processes over the last few decades. Since its invention in 1986, it has undergone rapid developments ... -
Parameter Estimation of Axial Pipe Movement of an Oil Field Drill String
(Master thesis, 2017)Drill strings are long slim rods used in well drilling to transmit torque and weight to the drill bit from the surface. As a consequence, these narrow structures experience various vibrations that could damage the well ...