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Response analysis and comparison of a spar-type floating offshore wind turbine and an onshore wind turbine under blade pitch controller faults
(Journal article; Peer reviewed, 2016)This paper analyses the effects of three pitch controller faults on the responses of an onshore wind turbine and a spar-type offshore floating wind turbine. These faults include: a stuck blade pitch actuator, a fixed value ... -
Resynchronization of Islanded Virtual Synchronous Machines by Cascaded Phase and Frequency Controllers Acting on the Internal Power Reference
(Chapter, 2020)Virtual Synchronous Machines (VSMs) have the capability to operate in grid connected or in islanded mode in the same way as synchronous machines. Furthermore, VSMs can inherently support seamless transition from grid ... -
A retrospective look at cross model validation and its applicability in vibrational spectroscopy
(Peer reviewed; Journal article, 2021)In this paper, it is presented how Cross Model Validation (CMV), also known as double cross validation, efficiently can be applied for variable selection in spectroscopic applications. The chosen applications are FT-IR ... -
Review of advanced physical and data‐driven models for dynamic bioprocess simulation: Case study of algae–bacteria consortium wastewater treatment
(Peer reviewed; Journal article, 2019)Microorganism production and remediation processes are of critical importance to the next generation of sustainable industries. Undertaking mathematical treatment of dynamic biosystems operating at any spatial or temporal ... -
A review of path planning algorithms in maritime autonomous surface ships: Navigation safety perspective
(Peer reviewed; Journal article, 2022)Unmanned maritime systems are evolving in a rapidly changing environment. Although the regulation and international law processes are still in progress, there are numerous research attempts regarding autonomous maritime ... -
Review of the Effect of Meals on the Glucose-Insulin Regulatory System
(Master thesis, 2021)Diabetes mellitus er en sykdom som kjennetegnes ved mangelen på å kontrollere blodsukkernivået grunnet ingen produksjon av insulin eller redusert insulinsensitivitet. Behandling av diabetes inkluderer derfor injeksjoner ... -
Review of two-phase flow models for control and estimation
(Journal article; Peer reviewed, 2016)Most model-based control and estimation techniques put limitations on the structure and complexity of the models to which they are applied. This has motivated the development of simplified models of gas-liquid two-phase ... -
Reward Shaping and Performance Analysis of Proximal Policy Optimization for Quadrotor Navigation in Environments of Varying Complexity
(Master thesis, 2023)Utviklingen av autonome luftfartøy som kan utføre raske og smidige manøvrer i komplekse omgivelser har vært utfordrende. Tradisjonell kontroll er avhengig av flere moduler som oppfatter, kartlegger, planlegger og styrer ... -
RFI Localization in a Collaborative Navigation Environment
(Peer reviewed; Journal article, 2020)Since the received GNSS signals are inherently very weak, a simple GNSS signal jammer can easily degrade the measurement quality, or completely deny GNSS signal reception at the receiver. In the context of collaborative ... -
Rigid head-neck responses to unpredictable perturbations in patients with long standing neck pain does not change with treatment
(Peer reviewed; Journal article, 2020)In a previous study we have shown that patients with long standing non-specific neck-pain display more rigid neck movement behavior than controls in response to unpredictable perturbations. In the present study we investigated ... -
Risk Analysis for the Design of a Safe Artificial Pancreas Control System
(Journal article; Peer reviewed, 2018)Closed-loop glucose control has the potential to improve the glycemic control in patients with diabetes mellitus type 1. Such an artificial pancreas (AP) should keep the user safe despite all disturbances and faults. The ... -
A Risk Aspect of Periodic Testing on Pressure Relief Valves
(Peer reviewed; Journal article, 2022)A pressure relief valve (PSV) is a key safety barrier to prevent the catastrophic rupture of pressure equipment in a process plant. The safety function of a PSV is to open and relieve the pressure when the equipment pressure ... -
Risk awareness and control of autonomous robots
(Doctoral theses at NTNU;2023:63, Doctoral thesis, 2023)Norsk sammendrag Å gjøre autonome systemer i stand til å fungere trygt uten direkte menneskelig overvåking krever at systemene får en situasjonsbevissthet som det i dag hovedsakelig er operatøren som står for. En avgjørende ... -
Risk-aware decision-making and control of autonomous ships
(Doctoral theses at NTNU;2023:200, Doctoral thesis, 2023)Autonomous agents able to operate without human supervision require decision making capabilities that predict outcomes based on internal and external models, sensors and data. However, research on the topic of incorporating ... -
Risk-aware Motion Planning for Collision-tolerant Aerial Robots subject to Localization Uncertainty
(Chapter, 2022)This paper contributes a novel strategy towards risk-aware motion planning for collision-tolerant aerial robots subject to localization uncertainty. Attuned to the fact that micro aerial vehicles are often tasked to navigate ... -
Risk-based Autonomous Maritime Collision Avoidance Considering Obstacle Intentions
(Chapter, 2020)A robust and efficient Collision Avoidance (COLAV) system for autonomous ships is dependent on a high degree of situational awareness. This includes inference of the intent of nearby obstacles, including compliance with ... -
Risk-based Convolutional Perception Models for Collision Avoidance in Autonomous Marine Surface Vessels using Deep Reinforcement Learning
(Chapter, 2023)In this work, we propose a novel policy network architecture for model-free Reinforcement Learning (RL)-based path-following and collision avoidance in marine surface vessels. By applying convolutional neural networks ... -
Risk-based implementation of COLREGs for autonomous surface vehicles using deep reinforcement learning
(Peer reviewed; Journal article, 2022)Autonomous systems are becoming ubiquitous and gaining momentum within the marine sector. Since the electrification of transport is happening simultaneously, autonomous marine vessels can reduce environmental impact, lower ... -
Risk-Based Model Predictive Control for Autonomous Ship Emergency Management
(Peer reviewed; Journal article, 2020)Control for semi- and fully-autonomous ships is a broad and complex field. Making autonomous high-level decisions in place of the captain is considered difficult, partly due to the risks and uncertainties involved. Though ... -
Risk-Based Obstacle Avoidance in Unknown Environments using Scenario-Based Predictive Control for an Inspection Drone Equipped with Range Finding Sensors
(Chapter, 2019)This paper develops an obstacle avoidance strategy for inspection drones equipped with simple range finding sensors, such as radar or sonar. The obstacle avoidance strategy uses scenario-based model predictive control where ...