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Towards the design of a smart warehouse management system for spare parts management in the oil and gas sector
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-25)Introduction: The oil and gas production industry requires rapid changing. As oil and gas companies around the world are called upon to decarbonize, several sectors within the industry are attempting to find new ways of working to achieve decarbonization. One of those sectors is spare parts warehousing. During the past decades of oil and gas production, spare parts warehousing has not been ... -
Marine winterization - Measures to abate sea-spray icing
(Doctoral thesis; Doktorgradsavhandling, 2024-12-20)<p>This thesis includes the topic of sea-spray icing on vessels and structures and dives further into methods of ice management. Sea-spray icing is a challenge in cold waters, particularly for small and mid-sized vessels. Excessive ice accretion is hazardous for vessel stability, operations and personnel safety. <p>Sea-spray icing from wave-vessel-wind interaction is a complex phenomenon. No measuring ... -
Ship appointment scheduling for lockage operations of waterway transport with non-punctual arrivals
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-25)The appointment scheduling of ships has been considered as an essential avenue for managing ship arrival pattern and mitigating waterway traffic congestion. This paper studies the ship appointment scheduling problem for lockage operations of waterway transport, and a new mathematical model is formulated to minimize the average waiting time of ships around the dam, in which the non-punctual arrival ... -
Exploring the development trajectory of single-machine production scheduling
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-25)The Single-Machine Scheduling Problem (SMSP) serves as the cornerstone of scheduling theory. Almost all developments in production planning and control were initially introduced and tested within single-machine production settings. Exploring the literature on SMSPs illuminates the entire development trajectory of scheduling theory. This study employs the Main Path Analysis (MPA) for a systematic ... -
An experimental study of effect of printed thickness on the mechanical properties of LPBF produced AlSi10Mg
(Chapter; Bokkapittel, 2024-04-24)Additive manufacturing process allows fabrication of parts with a broad range of sizes with high resolution. This size variation introduces new mechanical properties within the printed component, which creates a significant challenge for the qualification of additively manufactured parts. This unresolved issue hinders the implementation of additive manufacturing in high performance engineering ... -
Experimental Investigation of Free Space Optical Channel Performance in the Arctic Weather
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-07)This paper investigates the technical aspects of the 1550 nm free space optical (FSO) link in extreme Arctic weather, specifically in falling snow, which is currently understudied. We measured the time variation of the received optical power in many snowfall events and derived attenuation statistics. Continuous measurements allowed us to estimate attenuation under varying temperatures and humidity ... -
Multimodal analysis of saddle micro-terrain prone to wind disasters on overhead transmission lines
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-13)Pervasive micro-terrain is a significant contributor to wind disasters on transmission lines. This study explores the effect of saddle micro-terrain on the wind field of transmission lines and proposes relevant models and analysis methods. Firstly, the characteristic elements and parameters of saddle micro-terrain are extracted using DEM and established representative cross-sections for classification. ... -
Atmospheric icing meteorological parameter study using field experiments and simulation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-12)Atmospheric icing on ground structures is a concern from design, operation, and safety perspectives. Supercooled water droplets size and liquid water content (LWC) are important weather parameters to better understand the ice accretion physics on ground structures. Most existing studies are based on measurements at high altitude. The study is based on the field results of a specific event (from ... -
A Decision Support Framework for Metal Additive Manufacturing Adoption in Small and Medium-Sized Enterprises
(Doctoral thesis; Doktorgradsavhandling, 2024-12-03)Today's manufacturing landscape is undergoing constant changes, particularly through the widespread integration of advanced digital technologies. Among these, Metal Additive Manufacturing (MAM) stands out, signaling a new era of flexibility and customization capabilities that promise to significantly enhance business competitiveness, sustainability, and cost efficiency. However, the outcomes of MAM ... -
Exploring Heat Transfer in Freezing Supercooled Water Droplet through High-Speed Infrared Thermography
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-07)This study explores the intricate heat transfer dynamics and thermographic patterns during the phase change from supercooled liquid water to ice. Using high-resolution, high-speed infrared thermography, real-time temperature data were captured during the freezing process. The resulting temperature profiles reveal critical insights into the freezing dynamics, particularly highlighting the rapid ... -
A Network-based Set Covering Model for Charging Station Location Problem: A Case Study in Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-25)Due to the worldwide concern about excessive greenhouse emissions and global warming, vehicles with cleaner sources of energy, e.g., electricity, hydrogen, etc., have been increasingly introduced into the market. Apart from the regulations and government incentives, the distance convenience and accessibility to charging stations have become one of the most important success factors to promote the ... -
The Application of Simulation in Facility Layout Design of an Industry 4.0 Factory
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-25)Facility layout planning (FLP) is one of the most discussed industrial topics that affects the performance of a manufacturing system. Conventional approaches have extensively focused on quantitative analyses with a primary focus on cost minimization. The recent technological development in computer-based simulation has provided powerful tools to better visualize and test different layouts in an ... -
Investigation into Using CFD for Estimation of Ship Specific Parameters for the SPICE Model for Prediction of Sea Spray Icing: Part 1—The Proposal
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-18)A machine learning model for prediction of icing on vessels and offshore structures, Spice, was recently developed by Deshpande 2023. Some variables required for the prediction of icing rates in most prediction models, including Spice, such as the spray flux, cannot be easily measured. Existing models estimate these using empirical formulations that have been heavily criticized. Most existing models ... -
An Investigation into Using CFD for the Estimation of Ship Specific Parameters for the SPICE Model for the Prediction of Sea Spray Icing: Part 2—The Verification of SPICE2 with a Full-Scale Test
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-18)A hybrid CFD–ML model for the prediction of sea spray icing, SPICE2, was developed in Part 1 of this study in Deshpande et al., 2024. The SPICE2 model is an extension of the ML model, SPICE, where some of the variables required for icing rate predictions: local wind speed, spray duration, spray period, and spray flux, are computed from CFD simulations. These, along with the air and water ... -
An alternative two-phase formulation and analytical solution for a Stefan problem in one-dimension accounting for volume change and sensible heat
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-09)Stefan problems, or free boundary problems, in the phase change process occur in many engineering problems. This paper develops a compact formula for a two-phase melting process in a one-dimensional semi-infinite slab with a novel approach. Unlike the classic Stefan problem, the novel approach considers volume change (or density difference) and the net-sensible-heat of the two phases. Furthermore, ... -
Metal additive manufacturing adoption in SMEs: Technical attributes, challenges, and opportunities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-26)Recent advancements in Metal Additive Manufacturing (MAM) are transforming manufacturing. Most research and market adoption of MAM have focused on Powder Bed Fusion (PBF), with less attention given to Directed Energy Deposition (DED), Binder Jetting (BJ), and Metal Material Extrusion (MEX), which are only now reaching industrial readiness. This increased availability of MAM processes provides SMEs ... -
Expanding the horizons of metal additive manufacturing: A comprehensive multi-objective optimization model incorporating sustainability for SMEs
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-11)Metal Additive Manufacturing (MAM) has seen significant growth in recent years, with sub-processes like Metal Material Extrusion (MEX) reaching industrial readiness. MEX, known for its cost-effectiveness and ease of integration, targets a distinct market segment compared to established high-end MAM processes. However, despite technological improvements, its overall integration into the industry as ... -
Investigating Ice Nucleation and Heat Transfer Dynamics in Supercooled Liquid Water Using Thermography
(Chapter; Bokkapittel, 2024-06)This study delves into the intricate interplay of thermography, ice nucleation, and heat transfer during the phase change from supercooled liquid water to crystallized ice. Utilizing high-resolution, high-speed infrared thermography, real-time temperature data is captured during ice nucleation events. By analysing these temperature profiles, valuable information about the dynamics of ice nucleation ... -
Optimizing Gridded Heater Arrangements in Anti-/De-icing Systems through Multiphysics Thermal Simulation
(Chapter; Bokkapittel, 2024-06)The electro-thermal system in anti-/de-icing systems, known for its reliability, is often favoured despite its notable drawback—high power consumption. Seeking to mitigate this issue, the adoption of a gridded heated surface emerges as a promising avenue for energy optimization. In this study, a finite difference method is employed to meticulously examine heat transfer across a selected surface with ... -
Assessment of aircraft anti-icing ethylene glycolbased fluid ethylene glycol-based performance using thermography approach
(Chapter; Bokkapittel, 2024-06)Protecting the aircraft surfaces from ground icing in cold weather conditions before takeoff via anti-icing fluids is crucial for flight safety. These fluids offer a specific protection time evaluated through outdoor endurance time testing. As outdoor conditions are difficult to standardize and repeat, there is interest in developing interior tests under simulated snow conditions. This study ...
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