Blar i Institutt for marin teknikk på tidsskrift "Energies"
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A Crane Overload Protection Controller for Blade Lifting Operation Based on Model Predictive Control
(Journal article; Peer reviewed, 2019)Lifting is a frequently used offshore operation. In this paper, a nonlinear model predictive control (NMPC) scheme is proposed to overcome the sudden peak tension and snap loads in the lifting wires caused by lifting speed ... -
Comparing the Utility of Coupled Aero-Hydrodynamic Analysis Using a CFD Solver versus a Potential Flow Solver for Floating Offshore Wind Turbines
(Peer reviewed; Journal article, 2023)There has been a great effort towards development of renewable energy systems to combat global warming with significant interest towards research and development of floating offshore wind turbines (FOWTs). With commercial ... -
Comparison of Extreme Wind and Waves Using Different Statistical Methods in 40 Offshore Wind Energy Lease Areas Worldwide
(Peer reviewed; Journal article, 2023)With the ongoing global drive towards renewable energy, several potential offshore wind energy lease areas worldwide have come into focus. This study aims to estimate the extreme wind and wave conditions across several ... -
Comparison of Nonlinear Wave-Loading Models on Rigid Cylinders in Regular Waves
(Journal article; Peer reviewed, 2019)Monopiles able to support very large offshore wind turbines are slender structures susceptible to nonlinear resonant phenomena. With the aim to better understand and model the wave-loading on these structures in very steep ... -
Large floating structure with free-floating, self-stabilizing tanks for hydrocarbon storage
(Journal article; Peer reviewed, 2019)Hydrocarbon is a major source of energy for sustainable development. Storage of hydrocarbon products, however, requires a significant amount of land space to land-scarce countries like Singapore. This paper presents an ... -
Life Cycle Assessment of Various PMSG-Based Drivetrain Concepts for 15 MW Offshore Wind Turbines Application
(Peer reviewed; Journal article, 2023)There are different configurations selected by both industry and academia as the drivetrain for wind turbines in the power range of 10 to 16 MW. The choice of drivetrain system influences the levelized cost of energy, and, ... -
Minimum leading edge protection application length to combat rain-induced erosion of wind turbine blades
(Peer reviewed; Journal article, 2021)Leading edge erosion (LEE) repairs of wind turbine blades (WTBs) involve infield application of leading edge protection (LEP) solutions. The industry is currently aiming to use factory based LEP coatings that can applied ... -
New Renewable Hydrothermal Liquefaction (HTL) Biofuel: A Combustion and Emissions Study in an Optical Engine
(Journal article; Peer reviewed, 2023)This study involves the investigation of municipal solid waste (MSW) based biofuel in order to demonstrate its utilization as a diesel blendstock in a compression ignition (CI) engine. The biofuel was produced from the ... -
Physical and mathematical modeling of awave energy converter equipped with a negative spring mechanism for phase control
(Journal article; Peer reviewed, 2018)A wave-energy converter has been studied through the combination of laboratory experiments and numerical simulations. The converter model is a semi-submerged axi-symmetric buoy with a circular cross section with a diameter ... -
Response-Based Assessment of Operational Limits for Mating Blades on Monopile-Type Offshore Wind Turbines
(Journal article; Peer reviewed, 2019)Installation of wind-turbine blades on monopile-type offshore wind turbines is a demanding task. Typically, a jack-up crane vessel is used, and blades are individually lifted from the vessel deck and docked with the ... -
Risk Assessment and Reduction for an Innovative Subsurface Well Completion System
(Journal article; Peer reviewed, 2018)In recent years, many oil and gas fields have been discovered in ultra-deep sea (UDS). Some of these fields are evaluated to have no commercial value if existing oil field development approaches are used, especially while ... -
Spar-type vertical-axis wind turbines in moderate water depth: A feasibility study
(Journal article; Peer reviewed, 2018)The applications of floating vertical-axis wind turbines (VAWTs) in deep water have been proposed and studied by several researchers recently. However, the feasibility of deploying a floating VAWT at a moderate water depth ... -
Structural Reliability Analysis of Wind Turbines: A Review
(Journal article; Peer reviewed, 2017)The paper presents a detailed review of the state-of-the-art research activities on structural reliability analysis of wind turbines between the 1990s and 2017. We describe the reliability methods including the first- and ... -
Time Domain Modeling and Analysis of Dynamic Gear Contact Force in a Wind Turbine Gearbox with Respect to Fatigue Assessment
(Journal article; Peer reviewed, 2012)The gearbox is one of the most expensive components of the wind turbine system. In order to refine the design and hence increase the long-term reliability, there has been increasing interest in utilizing time domain ...