Institutt for marin teknikk
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Natural frequency estimation by using torsional response, and applications for wind turbine drivetrain fault diagnosis
(Journal article; Peer reviewed, 2020)A method based on torsional vibration measurements for a system-level condition monitoring of the drivetrain system is developed in this paper. The latter is tested by using a 10MW wind turbine drivetrain simulation model, ... -
Operational limits for aquaculture operations from a risk and safety perspective
(Peer reviewed; Journal article, 2020)Current decision making regarding whether to abort a high-risk aquaculture operation in a Norwegian fish farm is mainly experience-driven. The on-site personnel decides whether to start/delay/abort operations primarily ... -
A systems-theoretic approach to hazard identification of marine systems with dynamic autonomy
(Peer reviewed; Journal article, 2020)Autonomous marine systems may switch between various operational modes with different levels of autonomy (LoA), due to a rapidly changing environment and the complex nature of tasks. The dynamic autonomy brings an additional ... -
Design and Analysis of Mooring System for Semi-submersible Floating Wind Turbine in Shallow Water
(Doctoral thesis, 2020)Floating wind turbines are necessary to produce power from wind in deeper water where bottom-fixed wind turbines are not economically competitive. However, it is still not clear to which water depth a floating wind turbine ... -
Numerical study on the heading misalignment and current velocity reduction of a vessel-shaped offshore fish farm
(Peer reviewed; Journal article, 2019)Recently, the concept of a vessel-shaped fish farm was proposed for open sea applications. The fish farm comprises a vessel-shaped floater, five fish cages, and a single-point mooring system. Such a system weathervanes, ... -
A Three-Dimensional Model for Strength Assessment of Type-C Independent Cargo Tank Structures
(Peer reviewed; Journal article, 2020)For the analysis of the arrangement and strength of Type-C independent cargo tank structures, the linear spring or rod elements are usually used to model supporting woods, in which one-dimensional and linear contact behaviors ... -
Active Single-Blade Installation Using Tugger Line Tension Control and Optimal Control Allocation
(Peer reviewed; Journal article, 2020)The single-blade installation is a common method for the installation of wind turbine blades. In an offshore installation, a jackup vessel is often involved, and a crane is used to lift, move, and bolt each blade onto the ... -
Observations of Turbulence at a Near-Surface Temperature Front in the Arctic Ocean
(Peer reviewed; Journal article, 2020)High‐resolution ocean temperature, salinity, current, and turbulence data were collected at an Arctic thermohaline front in the Nansen Basin. The front was close to the sea ice edge and separated the cold and fresh surface ... -
Operability robustness index as seakeeping performance criterion for offshore vessels
(Peer reviewed; Journal article, 2020)The offshore industry operates increasingly large installations in exposed areas requiring high reliability and availability. Downtime of complex offshore systems leads to significant financial losses. Towards year-round ... -
Fluid flow in steady and oscillatory lid-driven square cavities
(Peer reviewed; Journal article, 2017)This paper presents numerical simulations of steady and oscillatory lid-driven cavity flow at different Reynolds numbers with a fixed aspect ratio of 1:1. A projection method (P2 pressure correction method) is applied to ... -
Incorporating software failure in risk analysis – Part 1: Software functional failure mode classification
(Peer reviewed; Journal article, 2020)Advanced technological systems consist of a combination of hardware and software, and they are often operated or supervised by a human operator. Failures in software-intensive systems may be difficult to identify, analyze, ... -
Hydroplastic response of a square plate due to impact on calm water
(Peer reviewed; Journal article, 2020)This paper investigates large, plastic deflections of a square plate due to impact on calm water. Most research in the area has examined linear elastic structural responses to such impact, but hydrodynamic responses during ... -
Monocular vision-based gripping of objects
(Peer reviewed; Journal article, 2020)Optics-based systems may provide high spatial and temporal resolution for close range object detection in underwater environments. By using a monocular camera on a low cost underwater vehicle manipulator system, objects ... -
Trajectory Planning for Navigation Aiding of Autonomous Underwater Vehicles
(Peer reviewed; Journal article, 2020)Autonomous underwater vehicles can perform seabed surveys with a higher resolution and quality than from equivalent ship-mounted sensors. Although high-grade inertial navigation systems aided by Doppler velocity logs can ... -
Application of data-driven models in the analysis of marine power systems
(Peer reviewed; Journal article, 2019)Computational thinking and coding are becoming an integral part of K-12 education, with female students being underrepresented in such subjects. The proliferation of technological tools and programming environments offers ... -
Learning from failures: Accidents of marine structures on Norwegian continental shelf over 40 years time period
(Peer reviewed; Journal article, 2020)This paper investigates accidents, major accidents and disasters which occurred on the Norwegian Continental Shelf (NCS) over a period of more than 40 years time (1972-2013). An accident investigation based on the system ... -
On multi-planar impact mechanics in ship collisions
(Peer reviewed; Journal article, 2019)This paper presents a new solution for ship impact dynamics in multi-planar space. A collision matrix is presented. It is derived on the basis of impact dynamics for rigid bodies. Effective mass factors are introduced ... -
Numerical and Experimental Study on the Parametric Roll Resonance for a Fishing Vessel with and without forward speed
(Peer reviewed; Journal article, 2020)The parametric resonance in roll motion (known shortly as parametric roll) was studied for a fishing vessel in regular waves. This is an instability and resonance phenomenon that can lead the roll to reach very high ... -
Unburned Hydrocarbon Formation in a Natural Gas Engine Under Sea Wave Load Conditions
(Peer reviewed; Journal article, 2020)Although natural gas is documented as a low-emission fuel compared to the other traditional fossil fuels in internal combustion engines, recent research indicates large amounts of methane emission released by lean burn gas ... -
Recent Advances in Integrated Response Analsysis of Floating Wind Turbines in a Reliability Perspective
(Peer reviewed; Journal article, 2020)Offshore wind provides an important source of renewable energy. While wind turbines fixed to the seabed in shallow water have already been industrialized, floating wind turbines are still at an early stage of development. ...
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