Browsing Institutt for marin teknikk by Title
Now showing items 2581-2600 of 3416
-
Produksjonsanlegg for rur
(Master thesis, 2019)For å utvikle et konsept for produksjon av rur er det først utviklet rammebetingelser. De er delt inn i biologiske og tekniske betingelser. De biologiske betingelsene gjør rede for rurens forhold til natur og miljø. Fjærerur, ... -
Prognosis and fault detection of drivetrains in medium-speed 10-MW Floating Wind Turbines
(Master thesis, 2020)Premature failures in large offshore Wind Turbines are often attributed to bearing failure despite gearboxes being designed and developed using the best bearing design practices. Furthermore, as turbine size and rated power ... -
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 ... -
Proposal and comparison of an eXogenous Kalman Filter and a Particle Filter for use with ROV thruster models
(Master thesis, 2018)Robust and accurate observer design is a prerequisite for safe and efficient underwater navigation. Especially with today's increased focus on automation and autonomy. In this thesis two model based observer designs for ... -
Propulsion control and thrust allocation on marine vessels
(Doktoravhandlinger ved NTNU, 1503-8181; 2008:203, Doctoral thesis, 2008) -
Propulsion methods for under water snake robots - Investigation and simulation using foil for propulsion of a snake robot
(Master thesis, 2015)In this thesis we present a model of a swimming underwater snake robot. How aquatic animals move in water has fascinated people for decades. NTNU started the research on land based snake robots 11 years ago. The last years ... -
Quantifying Icebreaker Performance in Ice Management Operations by High-Fidelity Numerical Simulations
(Chapter, 2020)In the study presented in this paper, the problem of quantifying the performance of icebreaker operations within ice management (IM) has been targeted, using the capabilities of high-fidelity simulations by a discrete ... -
Quantitative Evaluation of Bathymetric LiDAR Sensors and Acquisition Approaches in Lærdal River in Norway
(Peer reviewed; Journal article, 2023)The development of bathymetric LiDAR technology has contributed significantly to both the quality and quantity of river bathymetry data. Although several bathymetric LiDAR sensors are available today, studies that evaluate ... -
Quantitative risk assessment of the performance of barriers controlling fire and explosion risk
(Master thesis, 2019)The growing population of the world places an enormous demand for energy in some form or the other. Essentially, this means that the struggle to hunt and retrieve fossil fuels has to continue for the smooth functioning of ... -
Quantitative risk modelling in the offshore petroleum industry: integration of human and organizational factors
(Journal article; Peer reviewed, 2019)In-depth investigations of major offshore accidents show that technical, human, operational and organisational risk influencing factors (RIFs) all have crucial effects on the accident sequences. Nonetheless, the current ... -
Quantitative risk modelling of maintenance work on major offshore process equipment
(Journal article; Peer reviewed, 2018)Investigations of major offshore accidents show that both technical and non-technical factors have crucial effects on the accident sequences. Nonetheless, quantitative risk analyses (QRAs) have traditionally focused on the ... -
A quantitative ship risk model to select unannounced ship inspection - A tool to improve safety and environment?
(Master thesis, 2015)Norwegian Maritime Directorate has been worked with development of the risk-based inspection. The Directorate has established a method for risk assessment at a general level. However, they do not have any concrete method ... -
Quasi-dynamic modelling of shared mooring lines for floating wind turbines
(Master thesis, 2022)The idea of shared mooring systems has been introduced in the offshore wind farm industry as an effort to lower the overall installation costs for floating offshore wind farms. The reason for building such plants is that ... -
R/V Gunnerus Digital Twin Infrastructure
(Master thesis, 2020)Denne rapporten undersøker potensialet for bruk av digitale tvillinger i utdannings-øyemed for ingeniørstudenter gjennom NTNUs forskningsfartøy FF Gunnerus. Samtidig som digitale tvillinger blir mer og mer relevant for å ... -
Random wave-driven drag forces on near-bed vegetation in shallow water based on deepwater wind conditions
(Journal article; Peer reviewed, 2019)This article provides a simple analytical method for giving estimates of random wave-driven drag forces on near-bed vegetation in shallow water from deepwater wind conditions. Results are exemplified using a Pierson–Moskowitz ... -
Random wave-driven seabed shear stress estimation in shallow water based on long-term variation of deep water wave conditions
(Journal article; Peer reviewed, 2017)This article presents a simple analytical method giving estimates of wave-driven bottom stresses for very rough and mud seabeds in shallow water from long-term wave statistics in deep water. The results are exemplified ... -
Random Wave-Induced Burial and Scour of Short Cylinders and Truncated Cones on Mild Slopes
(Chapter; Peer reviewed, 2017)A stochastic approach calculating the random wave-induced burial and scour depth of short cylinders and truncated cones on mild slopes is provided. It assumes the waves to be a stationary narrow-band random process and a ... -
Random wave-induced current in shallow water using deep-water wind and wave statistics
(Peer reviewed; Journal article, 2020)This paper addresses the random wave-induced current in shallow water based on deep-water wind and wave statistics, where the wave-induced current is expressed in terms of the deep-water seastate wave parameters, significant ... -
Rao-Blackwellized Particle Filter with Grid-Mapping for AUV SLAM Using Forward-Looking Sonar
(Chapter, 2018)This paper adresses underwater localization for an AUV using SLAM and Forward Looking Sonar (FLS) data. The proposed method is Rao-Blackwellized Particle Filter (RBPF) with grid mapping. The original RBPF uses multiple ... -
A rate and pressure dependent elastoplastic material model for glacial ice colliding with marine structures
(Chapter, 2023)An elastoplastic ice material model with a rate and pressure dependent yield criterion is proposed in the present study for ice-structure collision simulations. The yield criterion is based upon the Tsai-Wu failure envelope ...