Institutt for marin teknikk
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Phase-field simulation of ductile fracture in shell structures
(Peer reviewed; Journal article, 2021)In this paper, a computational framework for simulating ductile fracture in multipatch shell structures is presented. A ductile fracture phase-field model at finite strains is combined with an isogeometric Kirchhoff-Love ... -
Handling Ship Design Complexity to Enhance Competitiveness in Ship Design
(Doctoral theses at NTNU;2021:92, Doctoral thesis, 2021)Ship design is inherently complex. In the literature, typically, complexity is associated with increased cost and requires more advanced tools, better procedures, expertise, and man-resources to deal with it. In the design ... -
Tuning of vessel parameters including sea state dependent roll damping
(Peer reviewed; Journal article, 2021)Online tuning of vessel models based on onboard measurement data can reduce the uncertainties of vessel motion prediction, and therefore potentially increase the safety and cost efficiency for marine operations. Among the ... -
Influence of Turbocharger Inertia and Air Throttle on Marine Gas Engine Response
(Journal article, 2021)Due to the current emission legislation, improving the marine propulsion system performance has received considerable notice. Employing natural gas as the primary energy source presented remarkable attention in the lean-burn ... -
Effect of modelling inhomogeneous wave conditions on structural responses of a very long floating bridge
(Peer reviewed; Journal article, 2021)Floating bridges are suitable for connecting land parcels separated by wide and deep waterbodies. However, when the span of the crossing becomes very long, the water environment exhibits inhomogeneities which introduce ... -
Algorithmic formulation of clay and sand pipe–soil interaction models for on-bottom stability analysis
(Peer reviewed; Journal article, 2021)This paper presents a new algorithmic formulation of the clay and sand pipe–soil interaction models recommended by the DNV-RP-F109 code for dynamic on-bottom stability analysis of submarine pipelines. The pipe–soil force ... -
On the sensitivity and uncertainty of wave energy conversion with an artificial neural-network-based controller
(Peer reviewed; Journal article, 2019)This work addresses with sensitivity and uncertainty of the energy conversion of an oscillation-body wave energy converter with an artificial neural-network-based controller. The smart controller applies the model predictive ... -
Review and comparison of existing risk analysis models applied within shipping in ice-covered waters
(Peer reviewed; Journal article, 2021)With the changing climate and declining extent of sea ice, the activities in the Arctic region have become increasing significantly. Compared to the environments with ice-free waters, the harsh environment in the Arctic ... -
Maximization of wave power extraction of a heave point absorber with a sea-state-based causal control algorithm
(Peer reviewed; Journal article, 2020)A causal control strategy is developed to tackle the non-causality arising in the real-time implementation of optimal wave energy control. The proposed control strategy utilizes a causal approximation transfer function to ... -
Properties of breaking irregular waves over slopes
(Peer reviewed; Journal article, 2020)The present study numerically investigates the breaking and spectral characteristics and geometric properties of breaking irregular waves over slopes for different incident waves. The growth of wave non-linearity and wave ... -
Coupled Fluid–Solid Numerical Simulation for Flow Field Characteristics and Supporting Performance of Flexible Support Cylindrical Gas Film Seal
(Peer reviewed; Journal article, 2021)A new type of cylindrical gas film seal (CGFS) with a flexible support is proposed according to the working characteristics of the fluid dynamic seal in high-rotational-speed fluid machinery, such as aero-engines and ... -
Comparative study of short-term extreme responses and fatigue damages of a floating wind turbine using two different blade models
(Journal article; Peer reviewed, 2020)In this work, two different blade structural models are used to estimate the blade deformations and the global structural responses of a 10MW floating offshore wind turbine (FOWT). One model is based on the Euler-Bernoulli ... -
Efficient prediction of wind and wave induced long-term extreme load effects of floating suspension bridges using artificial neural networks and support vector machines
(Journal article; Peer reviewed, 2020)Long-term extreme load effects are one of the primary concerns in the design of civil and offshore structures. Such load effects can be evaluated using the accurate but computationally demanding full long-term method or ... -
Experimental Study on the Drag Forces on a Twin-tube Submerged Floating Tunnel Segment Model in Current
(Journal article; Peer reviewed, 2020)In this paper, the drag forces on a rigid segment of a twin-tube submerged floating tunnel (SFT) under various Re number and submergence are experimentally investigated with a simplified rigidly connected tandem twin-cylinder ... -
Hysteretic Control Lyapunov Functions with Application to Global Asymptotic Tracking for Underwater Vehicles
(Chapter, 2021)This paper introduces hysteretic control Lyapunov functions (HCLFs) for hybrid feedback control of a class of continuous-time systems. A family of HCLFs consists of local control Lyapunov functions defined on open domains, ... -
Statistical modeling of Ship’s hydrodynamic performance indicator
(Peer reviewed; Journal article, 2021)The traditional method used to estimate the hydrodynamic performance of a ship uses either the model test results or one of the many empirical methods to estimate and observe the trend in fouling friction coefficient () ... -
Effect of T-groove Parameters on Steady-State Characteristics of Cylindrical Gas Seal
(Peer reviewed; Journal article, 2020)Gas film seal technology is becoming increasingly important as an advanced new rotary shaft seal technology in aviation engines and industrial gas turbines. In this paper the impacts of several parameters of T-groove ... -
Drivetrains on floating offshore wind turbines: lessons learned over the last 10 years
(Peer reviewed; Journal article, 2021)This paper presents lessons learned from own research studies and field experiments with drivetrains on floating wind turbines over the last ten years. Drivetrains on floating support structures are exposed to wave-induced ... -
A comparative study on the dynamic behaviour of 10 MW conventional and compact gearboxes for offshore wind turbines
(Peer reviewed; Journal article, 2020)This study compares the dynamic behaviour of a conventional and a compact gearbox for the DTU 10 MW wind turbine supported on a monopile offshore structure. The conventional gearbox configuration is composed of two planetary ... -
Three-dimensional wake transition behind an elliptic cylinder near a moving wall
(Peer reviewed; Journal article, 2021)In this work, the flow over an elliptic cylinder near a moving wall is investigated for Reynolds numbers less than 150. Here, the ratio between the gap (i.e., the distance between the cylinder and the wall) and the length ...
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