Browsing Institutt for teknisk kybernetikk by Title
Now showing items 50-69 of 3666
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A Gray-Box Method for Stability and Controller Parameter Estimation in HVDC-Connected Wind Farms Based on Nonparametric Impedance
(Journal article; Peer reviewed, 2019)Estimation of critical control parameters is a desirable tool feature for stability analysis and impedance shaping of high voltage dc (HVdc) connected wind farms. Accurate estimation of such parameters would be enabled by ... -
A heat equation for freezing processes with phase change: stability analysis and applications
(Journal article, 2016)In this work, the stability properties as well as possible applications of a partial differential equation (PDE) with state-dependent parameters are investigated. Among other things, the PDE describes freezing of foodstuff, ... -
A high fidelity digital twin framework for testing exteroceptive perception of autonomous vessels
(Master thesis, 2021)I fremtiden antas det at verifisering av autonome skip må gjøres ved simuleringsbasert verifisering på grunn av de enorme kostnadene som er involvert med ekte testing. I motsetning til bilindustrien, hvor det finnes åpent ... -
A homotopy-based moving horizon estimation
(Journal article; Peer reviewed, 2019)Moving horizon estimation (MHE) solves a constrained dynamic optimisation problem. Including nonlinear dynamics into an optimal estimation problem generally comes at the cost of tackling a non-convex optimisation problem. ... -
A homotopy-based moving horizon estimation
(Journal article; Peer reviewed, 2017)Moving horizon estimation (MHE) solves a constrained dynamic optimisation problem. Including nonlinear dynamics into an optimal estimation problem generally comes at the cost of tackling a non-convex optimisation problem. ... -
A hybrid approach to underwater docking of AUVs with cross-current
(Journal article, 2016)This paper proposes a docking maneuver for an underactuated autonomous underwater vehicle (AUV) to dock into a funnel shaped docking station. The novelty of the proposed approach is enabling an underactuated AUV that is ... -
A hybrid model of obstacle-aided snake robot locomotion
(Journal article; Peer reviewed, 2010)A snake can traverse cluttered and irregular environments by using irregularities around its body as push-points to aid the propulsion. This characteristic feature of biological snake locomotion, denoted obstacle-aided ... -
A K-Space Filtering Technique for Vibration Sonoelastography
(Master thesis, 2016)The aim of this project was to investigate the feasibility of a k-space filtration technique to produce elasticity maps with stationary vibration fields. The method was implemented in a MATLAB routine and tested against ... -
A Kalman-filtering derivation of simultaneous input and state estimation
(Journal article; Peer reviewed, 2019)Simultaneous input and state estimation algorithms are studied as particular limits of Kalman filtering problems. This admits interpretation of the algorithm properties and critical analysis of their claims to being partly ... -
A Least-Squares Scheme Utilizing Fast Propagating Shock Waves for Early Kick Estimation in Drilling
(Chapter, 2019)A scheme for fast kick estimation in managed pressure drilling is presented. The reservoir pressure and production index are estimated by utilizing information in a fast traveling shock wave induced by an unexpected rise ... -
A Light-Weight Operating System for Internet of Things Devices
(Master thesis, 2016)Nowadays, all around of us has been surrounded by wireless devices. More than a decade, engineers have been using these wireless devices in industry to measure environmental data. Large networks, which are formed by hundreds ... -
A Lightweight Payload for Hyperspectral Remote Sensing using Small UAVS
(Journal article; Peer reviewed, 2018)In this paper we describe a lightweight hyperspectral imaging payload consisting of a push-broom imager, GPS and IMU sensors as well as data synchronization and acquisition systems. The payload is developed in a modular ... -
A Machine Learning Approach for Estimating Air Data Parameters
(Journal article; Peer reviewed, 2019)This paper presents a method for estimating the air data parameters for a small fixed-wing, unmanned aerial vehicle (UAV) using an arrangement of low-cost MEMS-based pressure sensors embedded in the surface of the UAV. The ... -
A Machine Vision System for Robust Sorting of Herring Fractions
(Journal article, 2016)Among the rest raw material in herring (Clupea harengus) fractions, produced during the filleting process of herring, there are high-value products such as roe and milt. As of today, there has been little or no major effort ... -
A meta-parameterized approach for the evaluation of semiconductor technologies - A comparison between SiC-MOSFET and Si-IGBT technologies
(Journal article; Peer reviewed, 2018)This paper presents a meta-parameterized approach for the evaluation of Power Switch Modules (PSMs) in power converters. General models and parameters for the evaluation of power losses and volume of a PSM are presented. ... -
A Model-Based Speed and Course Controller for High-Speed ASVs
(Journal article; Peer reviewed, 2018)Well-performing low-level vessel controllers are a necessity for marine motion control applications such as path following, trajectory tracking and collision avoidance for autonomous surface vehicles (ASVs). Designing such ... -
A Modified Dynamic Window Algorithm for Horizontal Collision Avoidance for AUVs
(Chapter; Peer reviewed, 2016)Much research has been done on the subject of collision avoidance (COLAV). However, few results are presented that consider vehicles with second-order nonholonomic constraints, such as autonomous underwater vehicles (AUVs). ... -
A Modified Sequence-Domain Impedance Definition and Its Equivalence to the dq-Domain Impedance Definition for the Stability Analysis of AC Power Electronic Systems
(Peer reviewed; Journal article, 2016)Representation of ac power systems by frequency-dependent impedance equivalents is an emerging technique in the dynamic analysis of power systems including power electronic converters. The technique has been applied for ... -
A modular and waterproof snake robot joint mechanism with a novel force/torque sensor
(IEEE International Conference on Intelligent Robots and Systems. Proceedings;2012, Journal article; Peer reviewed, 2012)This paper presents the design of a waterproof and mechanically robust joint module for the snake robot Mamba. The main contribution of the module is a custom-designed force/torque sensor based on strain gauges, which ... -
A Modular Multilevel Interface for Transformerless Grid Integration
(Chapter, 2019)This paper presents a system configuration for transformer-less grid integration of large-scale charging infrastructures for electric vehicles (EVs) with wireless inductive charging. The proposed configuration relies on a ...