Institutt for marin teknikk
Recent Submissions
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The Aquaculture Service Vessel Routing Problem with Time Dependent Travel Times and Synchronization Constraints
(Journal article; Peer reviewed, 2021)This paper studies the Aquaculture Service Vessel Routing Problem (ASVRP), which is an important planning problem arising in sea-based fish farming. In the ASVRP, there is a set of fish farms located in the sea, where each ... -
System Modeling of Deep Sea Mining Operations for Evaluation of System Reliability and Availability
(Master thesis, 2022)Abstract will be available on 2024-04-01 -
Non-Linear Time Domain Analysis of Deepwater Riser Vortex-Induced Vibrations
(Doctoral theses at NTNU;2022:178, Doctoral thesis, 2022)Fatigue analysis of marine risers due to vortex-induced vibrations (VIV) is normally based on semi-empirical frequency domain methods which only allow for linear structural models, excluding non-linear effects (e.g., tension ... -
Simulation-Based Ship Hybrid Power System Concept Studies and Performance Analyses
(Doctoral theses at NTNU;2022:166, Doctoral thesis, 2022)The stricter regulations for emissions reduction and energy efficiency improvement are driving the maritime industries towards implementing greener and more energy-efficient solutions, one of which is a battery-based hybrid ... -
An isogeometric finite element-boundary element approach for the vibration analysis of submerged thin-walled structures
(Peer reviewed; Journal article, 2021)In this paper, the isogeometric formulations of the finite element and boundary element methods are applied to the dynamic analysis of thin-walled structures submerged in an infinite, inviscid, and incompressible fluid ... -
Estimation of Wind Turbine Gearbox Loads for Online Fatigue Monitoring Using Inverse Methods
(Chapter, 2021)In this article a novel approach for the estimation of wind turbine gearbox loads with the purpose of online fatigue damage monitoring is presented. The proposed method employs a Digital Twin framework and aims at continuous ... -
Initial response mechanism and local contact stiffness analysis of the floating two-stage buffer collision-prevention system under ship colliding
(Peer reviewed; Journal article, 2021)A floating two-stage buffer collision-prevention system (FTBCPS) has been proposed to reduce the impact loads on the bridge pier in this paper. The anti-collision process can be mainly divided into two stages. First, reduce ... -
A Robust Circuit and Controller ParametersIdentification Method of Grid-Connected VoltageSource Converters Using Vector Fitting Algorithm
(Peer reviewed; Journal article, 2021)This article presents a vector fitting (VF) algorithmbased robust circuit and controller parameters identification method for grid-connected voltage source converters (VSCs). The dq-domain impedance frequency responses ... -
A 2D+t approach for the transverse viscous loads in a modular maneuvering model
(Peer reviewed; Journal article, 2021)The importance of the transverse viscous loads, in a modular maneuvering model, is investigated. A method to estimate steady sectional drag coefficients is first presented. A 2D+t approach, which accounts for forward-speed ... -
Influence of ship design complexity on ship design competitiveness
(Peer reviewed; Journal article, 2021)Complexity is discussed in design literature mainly through its negative and in some cases positive consequences. This article critically reviews and elaborates the effects of complexity on competitiveness in ship design, ... -
Adaptive Sampling of Surface Fronts in the Arctic Using an Autonomous Underwater Vehicle
(Peer reviewed; Journal article, 2021)Fronts between Arctic- and Atlantic-origin waters are characterized by strong lateral gradients in temperature and salinity. Ocean processes associated with fronts are complex with considerable space and time variability. ... -
System Uncertainty Effects on the Wave Frequency Response Of Floating Vessels Based on Polynomial Chaos Expansion
(Chapter, 2021)From a mathematical viewpoint, the frequency domain analysis of vessel motion responses due to wave actions incorporates the integration of system dynamics idealized in terms of response amplitude operators (RAOs) for 6 ... -
Dynamic Model Development of Wind Turbine Drivetrains by Using Sensor Measurements
(Chapter, 2021)This paper aims to analyze the feasibility of establishing a dynamic drivetrain model from condition monitoring measurements. In this study SCADA data and further sensor data is analyzed from a 1.5MW wind turbine, provided ... -
Real-time deterministic prediction of wave-induced ship responses based on short-time measurements
(Peer reviewed; Journal article, 2021)This paper studies real-time deterministic prediction of wave-induced ship motions using the autocorrelation functions (ACFs) from short-time measurements, namely the instantaneous ACFs. The Prolate Spheroidal Wave Functions ... -
Indirect Measurements of Added-Wave Resistance on an In-Service Container Ship
(Chapter, 2021)This paper investigates a semi-empirical model used to estimate added-wave resistance on a ship sailing in waves. The model relies on measurements from a continuous monitoring system, and produces an estimate - the indirect ... -
The relevance of recoil and free swimming in aquatic locomotion
(Peer reviewed; Journal article, 2021)The study of the free swimming of undulating bodies in an otherwise quiescent fluid has always encountered serious difficulties for several reasons. When considering the full system, given by the body and the unbounded ... -
An adaptive harmonic polynomial cell method with immersed boundaries: Accuracy, stability, and applications
(Peer reviewed; Journal article, 2021)We present a 2D high-order and easily accessible immersed-boundary adaptive harmonic polynomial cell (IB-AHPC) method to solve fully nonlinear wave-structure interaction problems in marine hydrodynamics using potential-flow ... -
Estimation of autocorrelation function and spectrum density of wave-induced responses using prolate spheroidal wave functions
(Peer reviewed; Journal article, 2021)Predicting the wave-induced response in the near-future is of importance to ensure safety of ships. To achieve this target, a possible method for deterministic and conditional prediction of future responses utilizing ... -
On the role of added mass and vorticity release for self-propelled aquatic locomotion
(Peer reviewed; Journal article, 2021)Aquatic locomotion of a deformable body from rest up to its asymptotic speed is given by the unsteady motion which is produced by a series of periodic reactions dictated by the body configuration and by the style of swimming. ... -
Scaling laws for the water entry of a three-dimensional body
(Peer reviewed; Journal article, 2021)The present experimental investigation is a new way of conducting tests on model scale and of interpreting the results for the water entry of a free-falling conical body shape entrapping an air cavity. A three-dimensional ...