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Quaternion-Based Backstepping Control of Relative Attitude in a Spacecraft Formation
(Journal article; Tidsskriftartikkel, 2006-12)In this paper we present a solution to the problem of controlling relative attitude in a leader-follower spacecraft formation, with focus on the rotation path for the follower spacecraft. Mathematical models of relative attitude kinematics and dynamics are presented, and a nonlinear control law designed by use of integrator backstepping is used to control the relative attitude in the formation. The ... -
A model of relative position and attitude in a leader-follower spacecraft formation
(Chapter; Bokkapittel, 2005)In this paper, a model of a leader-follower spacecraft formation in six degrees of freedom is derived and presented. The nonlinear model describes the relative translational and rotational motion of the spacecraft, and extends previous work by providing a more complete factorization, together with detailed information about the matrices in the model. In addition, mathematical models of orbital ... -
Brannsikkerhet i elektriske forsyningsanlegg
(Master thesis; Mastergradsoppgave, 2023-06-01)Brannteknisk analytisk prosjektering handler om å dokumentere lovfestede krav til brannsikkerhet. Normer og anbefalinger har en sentral rolle i dette analytiske arbeidet, og bør presentere veldokumenterte løsninger som tilfredsstiller funksjonskravene. Elektriske forsyningsanlegg med tilhørende installasjoner har en rekke forskriftshjemlede krav som er rettet mot brannsikring og brannforebygging, ... -
Addressing Cross-Coupling Issues in Magnetically Integrated Three-Port DC-DC Converters
(Conference object; Konferansebidrag, 2024-10-25)DC grid-forming converters are used to provide dc power distribution inside buildings. Often, such converters are based on dual-active bridge (DAB) technology to provide high-frequency isolation. Certain developing standards related to dc installations specify different isolation classes and protection zones. This is a critical requirement for power converter design, especially for building applications ... -
Single-Stage, Single-Phase Current Source Inverter for Standalone Applications
(Chapter; Bokkapittel, 2024-03-10)The current source inverters (CSI) are considered more reliable than their voltage source counterparts due to the inherent current-limiting feature. This is particularly interesting for many applications, such as battery energy storage, where there is a possibility of very high short-circuit currents. In addition, CSI can provide an inherent voltage boost capability, allowing integration of extra-low ... -
Master thesis – Development of a portable energy convertor (heat to electric) for chimneys or wood – burning fireplace
(Master thesis; Mastergradsoppgave, 2024-05-15)The objective of this thesis addresses the challenge of designing a device capable of converting waste heat from metal chimneys or wood-burning fireplaces into usable electrical power. The product aims to be portable, easy to install, and adaptable to various chimney and fireplace configurations. This includes exploring various heat-to-electrical energy conversion technologies, researching existing ... -
Mulighetsstudie på plusshus i arktisk klima
(Master thesis; Mastergradsoppgave, 2021-05-14)Globalt står byggesektoren for over en tredjedel av energibruken, og nesten 40 prosent av det totale CO2-utslippet. På bakgrunn av miljøpåvirkningen byggesektoren har, er fokus på mindre utslipp og mer energieffektive bygg viktige tema i det grønne skifte. Plusshus er en sterk pådriver i dette skifte og det er viktig å belyse mulighetene for denne type bygg. Denne mulighetsstudien har som hensikt ... -
Performance Evaluation of Operators in the Telecommunication Industry
(Journal article; Tidsskriftartikkel; Peer reviewed, 2025-05-07)One of the pioneer technological developments for society is telecommunication. Thus, related industry is proliferating worldwide, and this acceleration forces companies to constantly increase their service quality and product variety to attract new customers. Especially in regions with high growth, losing customers to competitors (s) causes considerable costs in the long run. Therefore, companies ... -
A Stackelberg game analysis of livestreaming sales and product returns in e-commerce
(Journal article; Tidsskriftartikkel; Peer reviewed, 2025-04-24)Many enterprises selling products on e-commerce platforms have adopted livestreaming to increase sales volume. A high return rate, caused by an exaggerated presentation of the products, can overwhelm the supply chain. Livestreaming considering the product return issue has received little attention in the academic literature. Building on the existing knowledge of the traditional e-commerce sales ... -
Industrial Internet of Things-based Smart Warehouse Management System
(Doctoral thesis; Doktorgradsavhandling, 2025-05-08)Warehousing constitutes an important part of spare parts management in the oil and gas industry. During the past years, the introduction of Industry 4.0 has enabled several industries to introduce new technologies to their warehousing activities to optimize processes. Examples from industries such as e-commerce and retail have shown that Industry 4.0 technology implementation can lead to lower costs, ... -
Havforskningsinstituttets rådgivning for menneskeskapt støy i havet — Kunnskapsgrunnlag, vurderinger og råd for 2025
(Research report; Forskningsrapport, 2025-01-10)Havforskningsinstituttet gir råd for alle operasjoner til havs som involverer bruk av lydkilder eller lager lyd, samt elektromagnetiske kilder som kan påvirke marine økosystemer. Dette inkluderer vitenskapelige undersøkelser, utbygging og sprenging i sjø, seismiske og elektromagnetiske undersøkelser i forbindelse med petroleumsvirksomhet , utbygging og drift av vindkraftanlegg til havs og skip. Denne ... -
Data-driven Approach for Passenger Assignment in Urban Rail Transit Networks: Insights from Passenger Route Choices and Itinerary Choices
(Journal article; Tidsskriftartikkel; Peer reviewed, 2025-04-28)Congestion in urban rail transit (URT) systems often results in passengers being left behind on platforms due to trains’ reaching capacity. Distinguishing between the travel choice behaviors of passengers who board the first arriving train (Type I passengers) and those who are left behind (Type II passengers) in passenger assignment is essential for effective URT passenger management. This paper ... -
Vibration and Mobility Analysis of Hovering Rotary Wing UAV for Adaptive FSO Beam Alignment
(Chapter; Bokkapittel, 2024-11-28)Unmanned aerial vehicles (UAVs) are regarded as a potential platform for deploying airborne free space optical (FSO) fronthaul/backhaul links. The challenge emerges from the UAV hovering mobility which deteriorates beam alignment. To solve this challenge, we conducted two hover flights using a quadrotor UAV to measure vibration levels and hover fluctuations offering practical insights into the ... -
Modelling ductile fracture in an Al alloy with crystal plasticity models
(Chapter; Bokkapittel, 2024-04-24)Crystal plasticity models enhanced with coupled or uncoupled damage and fracture criteria give an opportunity to account for the role of microstructure in ductile fracture, most directly representing the local variations of stress and strain fields inside and between the grains, voids and particles. Some computationally efficient crystal plasticity, damage and fracture models have recently been ... -
Scheduling with Sequence-Dependent Setup Times in Short-Term Production Planning: A Main Path Analysis-Based Review
(Journal article; Tidsskriftartikkel; Peer reviewed, 2025-04-09)The role of setup times in production planning and control was recognised in the late 1960s. Since then, a growing number of scheduling problems have accounted for sequence-dependent setup time variables. This study aims to provide a systematic review of setup times in the short-term production planning literature, using an objective, algorithm-based approach. The Main Path Analysis (MPA) and ... -
Laser-Induced Plasma Effects on Bond Breaking in High-Density Polyethylene Pyrolysis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2025-04-16)The conventional use of Laser-Induced Breakdown Spectroscopy (LIBS) for elemental analysis in high-density polyethylene (HDPE) limits the exploration of bond behavior in Physics and Chemistry. A suitable combination of process parameters, exceeding the bond dissociation threshold, enables LIBS to break HDPE bonds, facilitating laser-induced pyrolysis. However, understanding bond behavior post-breakage, ... -
Energy Storage and the Green Transition: An Exploration of the Technology Selection Decision in the Arctic Region
(Conference object; Konferansebidrag, 2025-01-27)The Arctic region faces both challenges and opportunities in the green transition. Grid and electricity price stability, renewable adoption, and electric vehicle infrastructure highlight the need for resilient energy networks. Energy Storage emerges as a solution to ensure reliability and enable decentralization. This study aims to explore energy storage-related technology selection decisions, which ... -
GAP‐analyse av dagens opplæring for underordnet mannskap ved seiling i arktiske farvarnn sett i lys av næringens behov
(Research report; Forskningsrapport, 2023)Kompetansenodens formål er ifølge Nærings- og fiskeridepartementet sitt oppdrag å styrke den maritime næringens kompetanse om særskilte utfordringer knyttet til skipsoperasjoner i polare farvann. I arbeidet med å styrke arktisk maritim kompetanse skal det tas utgangspunkt i innmeldte problemstillinger, utfordringer og behov fra aktører i skipsfartsnæringen. <p> <p>Polarkoden stiller krav til ... -
Conversion between CAD models and generalized expo-rational B-spline surfaces
(Journal article; Tidsskriftartikkel; Peer reviewed, 2025-05-31)The proposed method demonstrates the conversion between a NURBS model and a generalized expo-rational B-spline (GERBS) surface with the aim of utilizing special combined expo-rational basis functions in finite element analysis.<p> <p>To achieve the transformation from a NURBS patch to a GERBS surface element, a linear extraction operator is employed. This operator maps the local combined expo-rational ... -
Thermographic analysis of ethylene glycol–based aircraft anti-icing fluid: Investigation of fluid failure mechanisms during simulated snow endurance tests
(Journal article; Tidsskriftartikkel; Peer reviewed, 2025-02-26)Applying anti-icing fluid is the primary method of protecting aircraft surfaces from freezing precipitation before takeoff. This research's main objective is to deepen our understanding of the fluid failure mechanisms using the infrared thermography technique to observe the snow-fluid interactions. We use a laboratory-scale setup with an optical and infrared camera to study the interaction between ...
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