Blar i NTNU Open på forfatter "Nøland, Jonas Kristiansen"
-
Non-normal-Mode Onset of Convection in a Vertical Porous Cylinder
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2020)This is the first study reporting a full three-dimensional (3D) non-normal-mode onset of convection in a porous medium. In this paper, the onset of thermal convection in a vertical porous cylinder is investigated theoretically. ... -
Online parameter identification of synchronous machines using Kalman filter and recursive least squares
Alves, Erick Fernando; Nøland, Jonas Kristiansen; Marafioti, Giancarlo; Mathisen, Geir (Chapter, 2019)This paper investigates and implements a procedure for parameter identification of salient pole synchronous machines that is based on previous knowledge about the equipment and can be used for condition monitoring, online ... -
Onset of Convection in a Triangular Porous Prism with Robin-Type Thermal Wall Condition
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Journal article; Peer reviewed, 2019)This paper investigates a peculiar case of thermal convection in a vertical porous prism with impermeable and partially conducting walls. We facilitate the analysis in the numerical finite-element environment alongside ... -
Onset of Convection in Two-Dimensional Porous Cavities with Open and Conducting Boundaries
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Journal article; Peer reviewed, 2021)The onset of thermal convection in two-dimensional porous cavities heated from below is studied theoretically. An open (constant-pressure) boundary is assumed, with zero perturbation temperature (thermally conducting). The ... -
Oscillatory Convection Onset in a Porous Rectangle with Non-analytical Corners
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2020)The analytical theory on Darcy–Bénard convection is dominated by normal-mode approaches, which essentially reduce the spatial order from four to two. This paper goes beyond the normal-mode paradigm of convection onset in ... -
Oscillatory Non-normal-Mode Onset of Convection in a Porous Rectangle
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Journal article; Peer reviewed, 2019)A special case of the fourth-order Darcy–Bénard problem in a two-dimensional (2D) rectangular porous box is investigated. The present eigenfunctions are of non-normal-mode type in the horizontal and vertical directions. ... -
Peaked sloshing in a wedge container
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2021)Finite-amplitude free-surface flow in a wedge container is investigated analytically. We study a motionless standing wave of pure potential-flow acceleration with maximal amplitude where its right-angle surface peak falls ... -
Potential and Limitations of Battery-Powered All-Electric Regional Flights–A Norwegian Case Study
Bærheim, Trym; Lamb, Jacob Joseph; Nøland, Jonas Kristiansen; Burheim, Odne Stokke (Journal article; Peer reviewed, 2022)The purpose of this study is to look at both the potential and the limitations of first-generation electric aviation technology while emphasizing Norway’s geographical opportunities and unique regional network. Electric ... -
Preliminary Sizing of a Battery-Powered All-Electric Propulsion System for Regional Aircraft
Aasen Anker, Markus; Nøland, Jonas Kristiansen (Chapter, 2022)This paper provides preliminary insight into the propulsion system requirements for a battery-powered all-electric airplane during cruising. The potential and limitations are demonstrated by proposing a sizing algorithm ... -
Production and development of HTS terminations for future HTS coil manufacturing
Aabrekk, Erling Andreas (Master thesis, 2023)Avslutningsmetodar/festepunkt for enkle og parallellkopla REBCO HTS teipar har blitt undersøkt i laboratorieeksperiment for å oppnå handteringskunnskap for framtidige eksperiment og produksjon av HTS spolar for EME ... -
Prospects and Challenges of the Hyperloop Transportation System: A Systematic Technology Review
Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2021)The present article outlines the core technologies needed to realize the Hyperloop transportation system (HTS). Currently, the HTS vacuum tube train concept is viewed as the fastest way to cross the earth’s surface. However, ... -
Rapid 3-D Magnetic Integral Field Computation of Current-Carrying Finite Arc Segments with Rectangular Cross-Section
Maurer, Frederic; Kawkabani, Basile; Nøland, Jonas Kristiansen (Journal article; Peer reviewed, 2020)The computation of three-dimensional (3-D) magnetic fields is a demanding task in the analysis of electrical machines and other electromagnetic devices. In this context, integral field calculation provides a smooth solution, ... -
A Rectangular End-Winding Model for Enhanced Circulating Current Prediction in AC Machines
Maurer, Frederic; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2020)The end-winding region is usually overlooked in the roebel design of large AC machines. However, saturated stator slots cause overhang parts to impact the circulating currents significantly. In fact, a precise knowledge ... -
Retrofit Design Space Investigation of Permanent Magnet Propulsion Motors for Electrified Turboprop Regional Aircraft
Broch, Håkon; Nøland, Jonas Kristiansen; Andrea, Bocchese (Chapter, 2022)The following paper examines existing turboprop regional aircraft and their required motor performance to determine the characteristics of PMSMs designed for full propulsion electrification. First, aircraft data are compiled ... -
Rotating Power Electronics for Electrical Machines and Drives - Design Considerations and Examples
Nøland, Jonas Kristiansen; Molinas Cabrera, Maria Marta (Chapter, 2020)The industrial shift towards rotating power electronics (RPE) promotes brushless flexible rotor excitation, as well as battery-less rotor instrumentation and measurement devices for electrical machines. Recently, the ... -
Spatial energy density of large-scale electricity generation from power sources worldwide
Nøland, Jonas Kristiansen; Auxepaules, Juliette; Rousset, Antoine; Perney, Benjamin; Falletti, Guillaume (Peer reviewed; Journal article, 2022)This paper introduces the annual energy density concept for electric power generation, which is proposed as an informative metric to capture the impacts on the environmental footprint. Our investigation covers a wide range ... -
Stability Study of an Isolated PMSM Grid in a Turbo-Electric Aircraft
Høgh, Alexander Onarheim (Master thesis, 2020)Abstract will be available on 2023-06-25 -
Stagnant peaked free surface released at a sloping beach
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2021)A stagnant free-surface flow is an instantaneous flow field of pure acceleration with zero velocity and a deformed surface. There exists a potential-flow acceleration field. With zero velocity and the acceleration field ... -
Start of a synchronous motor using rotor field polarity inversion and rotor back-emf sensing
Lundin, Urban; Evestedt, Fredrik; Abrahamsson, Johan; Pérez, José; Fregelius, Martin; Nøland, Jonas Kristiansen (Chapter, 2020)Synchronous motors are hard to line start due to torque pulsations at zero rotor speed and low starting torque when started using induced current in a damper squirrel cage. By inverting the rotor pole polarity at appropriate ... -
Stator Core Flux Density Analytical Determination in Slotless Machines
Elloumi, Nada; Leandro, Matteo; Nøland, Jonas Kristiansen; Tessarolo, Alberto (Chapter, 2020)Slotless machines equipped with surface-mounted permanent magnet (SPM) rotor are used in such applications where the torque ripple and the additional losses due to the slotting effect are critical. For this kind of machine ...