Fakultet for ingeniørvitenskap og teknologi: Nye registreringer
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Secondary Network Throughput Optimization of NOMA Cognitive Radio Networks Under Power and Secure Constraints
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-31)Recently, the combination of cognitive radio networks with the nonorthogonal multiple access (NOMA) approach has emerged as a viable option for not only improving spectrum usage but also supporting large numbers of wireless communication connections. However, cognitive NOMA networks are unstable and vulnerable because multiple devices operate on the same frequency band. To overcome this drawback, ... -
A Modified Version of the IEEE 39-bus Test System for the Day-Ahead Market
(Chapter; Bokkapittel, 2023-03-28)Reaching net-zero emissions within the proposed time requires an enormous effort from the energy sector, and it is even more challenging for the electricity infrastructure. This article offers a modified version of the IEEE 39-bus system specifically created to allow zonal day-ahead market (ZDAM) simulations. The system representation is based on the original version of the IEEE 39-bus system but ... -
Experiences in a Cyber-Physical Co-Simulation Testbed Development for a Smart-er Distribution Network
(Chapter; Bokkapittel, 2023-03-28)With the rise of the integration of renewable energy sources, the operating characteristics of existing electric power distribution systems are evolving and changing. As a result, the digitalisation of the distribution network is gaining attention for effective real-time monitoring and control. Cyber-Physical cosimulation is one of the options for implementing and testing novel concepts and ideas ... -
Sensitivity Analysis of Thermal Degradation of Plastic Waste Using Statistically Assumed Exponential Factors and Activation Energies
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-04)The rise in the production of plastic waste has prompted the exploration of various recovery options instead of landfilling, burning, and other unethical ways of decomposing. The experimentally generated rate constants for the thermal processing of plastic waste do not yield enough liquid fuels and gases for commercial-scale usage. It is imperative to predict kinetic rate constants statistically ... -
Concise Definition of the Overcurrent Protection System for CIGRE European Medium Voltage Benchmark Network
(Chapter; Bokkapittel, 2023-03-28)In the significant widespread transition towards clean energies, there has been an unstoppable trend in integrating renewable energy sources (RSs) in distribution networks. However, the massive penetration of integrated multisources into conventional distribution systems may create several operational problems, such as malfunctioning protection systems. This paper concisely defines the setting for ... -
Multiphysics Simulation of Particle-Surface Interaction and its Effect on Powder Patterns and Process Optimization
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-29)In industrial processes, powder coating is widely utilized to attain functional or aesthetic surface properties on manufactured parts. A Eulerian-Lagrangian Multiphysics solver has been developed within the OpenFOAM framework in order to simulate and optimize such processes with regards to coating efficiency and homogeneity. In the scope of this study, the powder particle-substrate and particle-particle ... -
Norwegian, Swedish, and Finnish first-year engineering students' motivational values and beliefs about the nature of mathematics
(Chapter; Bokkapittel, 2022)We report from a Nordic research project that has investigated first-year engineering students in Norway, Sweden, and Finland, and the relationships between their task performance, motivational values, and beliefs about the nature of mathematics. The present paper focuses on the covariance between their motivational values and beliefs from the perspectives of gender and nationality. The results ... -
Study of Dry Ice Growth on Duplex Cylinders
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022)A study of dry ice growth on bundled (duplex) cylinders has been performed using icing wind tunnel experiments and computational fluid dynamics (CFD) numerical simulations. The aim of this study is to "fill the gaps" in the works of Wagner (2010) and Qing et al. (2018). The numerical simulations cover a range of possible icing conditions by varying the operating wind speed, median volume diameter, ... -
Enhancement of Vehicular Visible Light Communication Using Spherical Detector and Custom Lens Combinations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-28)Vehicular Visible light communication (VLC) technology has recently attracted much interest from researchers and scientists. This technology enables connectivity between vehicles and infrastructures along the road by using vehicles’ headlights and taillights as wireless transmitters. The reliability of vehicle-to-vehicle (V2V) VLC systems is affected by several factors, such as car mobility, optics ... -
Delving Into the Interdependencies in the Network of Economic Sustainability Innovations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-23)Legislative pressures and public awareness are urging companies to foster sustainability innovations that improve business operations. Limited studies explored the underpinnings of the economic dimension of sustainability innovations; studying economic innovation criteria in the manufacturing sector of emerging economies can inform other industries while recession fears loom the financial prospects. ... -
Data Processing Scheme for Laser Spot Thermography Applied for Nondestructive Testing of Composite Laminates
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-08)This paper proposes a data processing scheme for laser spot thermography (LST) applied for nondestructive testing (NDT) of composite laminates. The LST involves recording multiple thermographic sequences, resulting in large amounts of data that have to be processed cumulatively to evaluate the diagnostic information. This paper demonstrates a new data processing scheme based on parameterization and ... -
Influence of large-scale asperities on the stability of concrete dams
(Chapter; Bokkapittel, 2022)For concrete dams founded on rock, there are only a few options in the common analysis methods to account for large‐scale asperities. However, previous research alludes that they have a significant impact on the behaviour of interfaces under shear. This study investigates the behaviour of concrete dam scale models with varying interface geometries, under a realistic set of eccentric loads. The outcome ... -
Security Constrained Unit Commitment and Economic Dispatch applied to the Modified IEEE 39-bus system Case
(Journal article; Tidsskriftartikkel, 2022-12-09)The operation schedule of the power generation units in electrical power systems is determined by the optimisation problem known as unit commitment (UC), aiming at minimising the total cost considering the generation constraints. To obtain a feasible solution from the network perspective, the security-constrained UC (SCUC) problem has been defined to embed the network constraints in the optimisation ... -
Cyber-Physical Co-Simulation Testbed for Real-Time Reactive Power Control in Smart Distribution Network
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-11)Existing electric power distribution systems are evolving and changing as a result of the high renewable energy sources integration. Hence, future smart distribution networks will involve various technical challenges; one of them is real-time monitoring and controlling the network to operate it effectively and efficiently. This paper develops and analyzes a cyber-physical co-simulation testbed for ... -
Numerical sensitivity analysis of temperature-dependent reaction rate constants for optimized thermal conversion of high-density plastic waste into combustible fuels
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-22)The use of experimental rate constants for producing a high yield of liquid fuels from the pyrolysis of plastic waste is not widely accepted owing to a lack of compatibility between the different kinetic rate constants responsible for successful conversion reactions. In R software, the Arrhenius law can forecast the ideal combination of reaction rate constants and frequency factors and then perform ... -
Real-Time Implementation of Two Grid-Forming Power Converter Controls to Emulate Synchronous Generators
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-09)Modern power systems are experiencing unprecedented penetration of integrating renewable energy sources (RES) to tackle the so-called climate emergency. But the transition from synchronous generators to converter-interfaced generators also produces a few issues, some of them directly related to the reduction (or lack) of rotational inertia. The voltage source converters (VSCs) enabled with the ... -
Security Constrained Unit Commitment and Economic Dispatch by AC Sensitivity Factors
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-09)The dispatch schedule of the electrical power plant units is the result of the solution to the unit commitment optimisation problem, and it minimises the cost of production considering pre-defined technical limits. The security-constrained unit commitment problem has been defined as including the network constraints in the previously mentioned optimisation problem to obtain a feasible power system ... -
Zonal Day-Ahead Energy Market: A Modified Version of the IEEE 39-bus Test System
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-11)The increasing penetration of renewable energy resources (RES) in transmission system operating conditions require a suitable test system and a dataset to cope with current issues. RES penetration remarkably affects day-ahead market outcomes regarding zonal prices and dispatched generation levels. For this purpose, zonal day-ahead energy market models in the presence of RES in the generation mix ... -
Evaluations of UAV-enabled FSO Communications in the Arctic
(Journal article; Tidsskriftartikkel, 2022-02-16)This paper investigates the feasibility of using free space optics (FSO) for communication between multiple hovering unmanned aerial vehicles (UAVs) and a detection unit (DU) in the Arctic. The uniqueness that sets apart UAV-based FSO systems from conventional FSO systems is the dynamics of the system since location and inclination of the UAV changes over time due to wind load and UAV oscillations. ... -
Investigation of ice accretion effect on the aerodynamic characteristics of a wind turbine blade tip after a short icing event
(Conference object; Konferansebidrag, 2022-01)The paper investigates the flow behavior near the NACA 64-618 airfoil profile of the blade tip section of a wind turbine for electric power production after a short icing event. The flow simulation considering the rotation speed of the wind turbine blade is performed to assess the effect of icing on the aerodynamic characteristics. Degradation of aerodynamic characteristics affects the electrical ...