Institutt for marin teknikk
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A computationally efficient method for identification of steady state in time series data from ship monitoring
(Peer reviewed; Journal article, 2020)An increasing number of ships are being equipped with sensors and devices for monitoring of operational behavior, and the amount and access to operational data is gradually increasing. Due to various reasons described in ... -
Experimental and numerical study of hydrodynamic responses of a twin-tube submerged floating tunnel considering vortex-induced vibration
(Doctoral theses at NTNU;2020:392, Doctoral thesis, 2020)A pontoon-supported submerged floating tunnel (SFT) is a reasonable means crossing a fjord with large depth and width. A relevant design of such a tunnel consists of two identical tubes in a tandem configuration and suspended ... -
A framework for efficient isogeometric computations of phase-field brittle fracture in multipatch shell structures
(Peer reviewed; Journal article, 2020)We present a computational framework for applying the phase-field approach to brittle fracture efficiently to complex shell structures. The momentum and phase-field equations are solved in a staggered scheme using isogeometric ... -
Dynamic modeling, simulation, and testing of a marine DC hybrid power system
(Peer reviewed; Journal article, 2020)The hybridization of power systems offers the low-emission and energy-efficient marine vessels. However, it increases the complexity of the power system. Design, analysis, control, and optimization of such a sophisticated ... -
Dynamic Modeling and Real-Time Simulation of a Ship Hybrid Power System Using a Mixed-Modeling Approach
(Journal article, 2020)The electrification of a ship power-train is growing at a fast pace to improve efficiency and reduce emissions. The implementation of new technologies requires test and validation using various modeling approaches. However, ... -
Model uncertainty assessment for wave- and current-induced global response of a curved floating pontoon bridge
(Peer reviewed; Journal article, 2020)The present paper provides a comparison between the numerical and experimental response for a generic floating pontoon bridge structure, thereby also serving to quantify the inherent uncertainties associated with both types ... -
Efficient Modelling and Design Optimization of Large Floating Wind Turbines
(Doctoral theses at NTNU;2020:356, Doctoral thesis, 2020)Floating wind turbines (FWTs) are considered a promising solution for wind energy harvesting in deep water, but are currently too expensive to compete with other energy sources. Being a relatively new and immature technology ... -
Effect of wave inhomogeneity on fatigue damage of mooring lines of a side-anchored floating bridge
(Peer reviewed; Journal article, 2020)Mooring systems are important structural components of very long floating bridges. They effectively limit the transverse motions of the bridge under environmental loads. They also add viscous hydrodynamic damping to the ... -
Design, Modelling and Analysis of a Large Floating Dock for Spar Floating Wind Turbine Installation
(Peer reviewed; Journal article, 2020)Installation of floating wind turbines at the offshore site is a challenging task. A significant part of the time efficiency and costs are related to the installation methods which are sensitive to weather conditions. This ... -
Next Generation Subsea Inspection, Maintenance and Repair Operations
(Peer reviewed; Journal article, 2016)This paper presents the latest developments in the project Next Generation Subsea Inspection, Maintenance and Repair (IMR). Subsea IMR operations are frequently carried out in the offshore oil and gas business. Increased ... -
Reliability-based assessment of marine operations with emphasis on sea transport on barges
(Doctoral theses at NTNU;2020:383, Doctoral thesis, 2020)This thesis addresses the structural reliability assessment of marine operations related to the transport of large and heavy objects. The base case has been sea transportation by means of a towed barge with an emphasis on ... -
Experimental and Numerical Hydrodynamic Analysis of a Damaged Ship Section In Waves
(Doctoral theses at NTNU;2020:361, Doctoral thesis, 2020)In the past few decades, ships have become larger, efficient, durable but the danger of accidental events like grounding, collision etc. continues to be a major issue in ship operations. Following a damage event, a ship ... -
Cavity flows and wake behind an elliptic cylinder translating above the wall
(Doctoral theses at NTNU, 2020:312, Doctoral thesis, 2020)Vortex formation is one of the fundamental modes in fluid mechanics and it can develop in almost every realization of fluid motion. Studying its fundamental dynamics and interactions is of great interest for engineering ... -
Preparation of in-service measurement data for ship operation and performance analysis
(Peer reviewed; Journal article, 2020)An increasing number of ships are being equipped with sensors and devices for monitoring of operational behavior, and the amount and access to operational data is gradually increasing. Due to various reasons described in ... -
Human-System Concurrent Task Analysis: An Application to Autonomous Remotely Operated Vehicle Operations
(Chapter, 2020)Autonomous systems may operate with different Levels of Autonomy (LoA), from remote control to fully autonomous. The latter is not expected in the near or intermediate future for most systems. Thus, operation relies on the ... -
Design Optimization of Spar Floating Wind Turbines Considering Different Control Strategies
(Peer reviewed; Journal article, 2020)One of the challenges related to the design of floating wind turbines (FWTs) is the strong interactions between the controller and the support structure, which may result in an unstable system. Several control strategies ... -
Observations from hydrodynamic testing of a flexible, large-diameter monopile in irregular waves
(Peer reviewed; Journal article, 2020)As the offshore wind industry moves toward larger wind turbines and deeper water, wave-induced loads on large-diameter monopiles are of increasing importance for ultimate limit state design checks. The combination of a ... -
Transient Performance in Dynamic Positioning of Ships: Investigation of Residual Load Models and Control Methods for Effective Compensation
(Doctoral theses at NTNU;2020:355, Doctoral thesis, 2020)This thesis concerns how the dynamic positioning (DP) control system can better handle transient events, where the loads experienced by the vessel change significantly over a short time frame. The material is intended for ... -
Consequences of load mitigation control strategies for a floating wind turbine
(Peer reviewed; Journal article, 2020)Several approaches to avoid control-induced resonances of floating wind turbines have been proposed. The main focus has been on reductions in global motions and loads in the tower base. In the present work, we examine the ... -
Non-linear hydroelastic response of a monopile foundation in regular waves
(Peer reviewed; Journal article, 2020)This paper presents an original contribution to the coupled hydroelastic simulation of offshore wind turbines foundations. A non-linear coupled simulation tool has been developed to calculate the response of these systems. ...
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