Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
1
Liste over oppgaver følger nedenfor. List of suggested topics follow below
Prosjekt masteroppgaver innen marin byggteknikk 2013/2014 Hei Denne oversikten gjelder for studenter som vurderer fordypning inn mot feltene som tilbys av Faggruppe marin byggteknikk på BAT. De fleste oppgavene er beskrevet på engelsk siden vi har mange utenlandske studenter som er interessert i oppgaver hos Faggruppe marin byggteknikk tilbyr primært fordypning inn mot studieretning konstruksjon, men tilbyr også fordypning som passer studenter med bygg og anleggsteknisk bakgrunn. Denne listen over aktuelle Prosjekt/masteropgaver innen Marin byggteknikk finner dere på http://www.ntnu.no/bat/studier/oppgaver. Orientering om hvordan du skal velge prosjektoppgave og fordypning om du er på studieretninger ved BAT står på samme side. Om du tilhører studieretning Konstruksjon følger du opplegget der og angir koden ”9.x.y tittel” for oppgaven, men ta kontakt med ansvarlig faglærer i god tid før 15. mai. Opplegg for registrering for studieretning konstruksjon finner du her: http://www.ntnu.no/kt/studier/prosjektoppgaver Hos Marin byggteknikk gjelder prinsippet: ’Først til mølla for først male’ Velkommen når som helst til å diskutere prosjekt / masteroppgave med oss. Avtal møte via E-post med oppført kontaktperson. Litt om Marin byggteknikk finner du her: http://www.ntnu.no/documents/10380/43037932-3645-4586-a1c7-e181fbd8e7b8 Selv om oppgavetekstene stort sett er på engelsk så er det mulig å skrive besvarelser på norsk (i samråd med veileder). Sist oppdatert: 10. April 2013
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
2
9. Marin Byggteknikk /Marine Civil Engineering
9.1 Port and Coastal
9.1.1. Evaluation of port terminal equipment
Topic: Evaluation of different terminal equipment in smaller container
terminals in terms of cost-effective container handling.
In Norway and in countries with smaller ports that have container volume less
than about 150,000 TEU, mainly use RS (Reach Stacker) as handling
equipment. This has been a cost effective solution and with limited investment
in equipment and great flexibility. However this occupy large areas and when
there is scarcity of land, the question is what is the container volume to achieve
a cost-effective management by using a more space efficient container handling
equipment. Today more automated container handling equipment are
developed such as the Rubber Tyre Gantry (RTG)) and the Rail-mounted
gantry (RMG)) that allows the container volume to bring such equipment in
use to be lowered.
It is therefore interesting in a project to compare, for example, RS with RTG
cranes in a small terminal to find out what are the advantages, disadvantages,
savings, etc. Today, there are limited empirical data collected and to be
together just the kind of operations. The project may well continue in a
master's thesis in which a detailed computational model for optimization of
smaller terminals will be developed.
Prerequisites: TBA4292 TBA4145 Port and Coastal Facilities
Task type: Literature survey and numerical simulations
Number of students: 1
Cooperation partner: Borg Port, Fredrikstad, Norway; Port Director Tore
Lundestad
Contact person at NTNU: Øivind A. Arntsen, [email protected]
Possibility for summerjob in Borg Port , Fredrikstad.
9.1.1 Kaikonstruksjon oppbygget i stål
Norskspråklig kandidat er ønsket.
Kaikonstruksjoner ivaretar grensesnittet mellom skip og land og ligger i kystsonen. Dette er et av de
hardest miljøbelastede stedene hvor konstruksjoner bygges med påfølgende skader og redusert levetid.
Tradisjonelt bygges kaikonstruksjoner i betong og materialutvikling med forståelse av
nedbrytningsmekanismer har i de senere årene forbedret seg kraftig med påfølgende øket levetid og
forbedret konstruksjonskvalitet.
Byggekostnader har også øket kraftig i de senere årene og i den forbindelse er det naturlig å undersøke
mulighet for bruk av alternative byggematerialer som stål og trevirke. En kombinasjon av trevirke og
limtre benyttes i dag til bygging av mindre kaikonstruksjoner og strandpromenader.
Kreosotimpregnering klasse marin viser seg å motstå pelemark og gi trevirket god beskyttelse, samt
sikre konstruksjonens levetid. Trevirke som materiale er godt egnet til bygging av lettere
kaikonstruksjoner for passasjertrafikk med mindre båter men begrensning i styrke reduserer
muligheten for bruk i industrikaier og kaier hvor større skip anløper. Stål derimot er et materiale som
kan være godt egnet for tyngre kaikonstruksjoner så fremt at bestandighet håndteres på en riktig måte
og at materialforbruk optimaliseres. I dag benyttes stål til kystnære konstruksjonsdeler, men ikke til
komplette kaikonstruksjoner.
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
3
Prosjektoppgaven består i å designe en mindre kaikonstruksjon bygget i stål etter gjeldende regelverk i
Norge. Konstruksjonen designes med basis i Norsk Standard NS-EN 1990 til NS-EN1999 og det tas
utgangspunkt i forskjellige prosjekterte levetider. Forskjellige byggemetoder som stedlig montering og
modulbygging vurderes. Avvik i byggeperioden spesielt med posisjonering av peler er vanlig ved
kaibygging og håndtering av avvik opp mot 0,50m i horisontal peleplassering inngår i oppgaven.
Stabilitet av kaikonstruksjonen med opptak av støtlaster fra skipsanløp og fortøyningslaster fra skipet
inngår i prosjektoppgaven. Det skal utføres en global stabilitetsanalyse av hele konstruksjonen hvor
horisontale laster følges helt inn i fundamenter.
Økonomi og byggetid er sentrale deler av oppgaven. Realistiske fremdriftsplaner med for de
forskjellige byggekonseptene skal leveres som en del av rapporten. Videre skal økonomien i
prosjektets undersøkes, både byggekostnader og levetidskostnader inkludert riving etter endt levetid.
Prosjektkostnader angis i nåverdiberegninger med basis i gjennomsnittlige renter og prisstigning de
seneste 5år gitt av SSB.
Korrosjonshastigheter i Eurocode og NA (NS-EN1993-5:2007+NA:2010) angir store forskjeller i
korrosjonshastigheter. Oppgaven skal også inneholde en sammenligning av levetidsforskjell og
prosjektkostnader for begge korrosjonshastighetene.
Arbeidet er en videreføring av en prosjektoppgave høsten 2012.
Aktuelle problemstillinger for en ny oppgave kan være.:
1. Konstruere et dekke som kan bære trafikklasten
Det lages ikke store nok rister per i dag hos de leverandørene som ble sjekket. Det er derfor behov for
å beregne og konstruere et dekke som er passende til dette formålet.
2. Design av knutepunkter
Bæresystemet må settes sammen på en funksjonsmessig bra måte. Det er et helt
symmetrisk bæresystem, derfor er det ikke nødvendig å designe alle knutepunktene for
seg selv, men enkelte utvalgte avhengig av lastkombinasjonene.
3. Festeanordning for fendere
Hvordan man skal feste fenderene til kaifronten er en utfordring det må sees på, også i
sammenheng med at man vurderer fendere som passer kaien godt.
4. Kaiens skjørt
Da dette er en stålkai må skjørtet konstrueres på en måte som ikke er gjort før, da vi ikke
kan støpe ned et skjørt i betong. Her vil det være mulig å være kreativ og prøve seg frem
med litt forskjellige løsninger.
Antall studenter: 1
Samarbeidspartner: Borg Havn, Fredrikstad, Norway; Port Director Tore Lundestad
Kontakt person ved NTNU: Øivind A. Arntsen, [email protected]
Veilder: Svein Ove Nyvoll, Nyvoll Concult. http://www.nyvcon.com/nor/about/
Mulighet for sommerjobb i Borg havn, Fredrikstad.
9.1.3. Intentionally blank
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
4
9.1.4 Estimating the effect of kelp (Laminaria hyperbiorea) on the wave conditions at the
harbours Kvalsvik and Kvamme during the storm “Dagmar”, Christmas 2011.
The Norwegian Directorate of Fisheries held a seminar at the island of Runde on 16 and 17 May 2012
where different aspects on the harvesting of kelp, Laminaria hyperborea, were discussed. The
participants of the seminar were government managers, researchers, representatives of a kelp
harvesting company and local managers and land owners. Alf Tørum presented “The wave damping
effect of kelp – does the harvesting of kelp give reduced wave damping?. The answer is “Yes”.
During the discussions it was specially mentioned that the breakwater in Kvalsvika on Nærlandsøya
and at the mall boat harbor at Kvamme, Kvamsøya, Figure 1, were damaged during the storm
“Dagmar” during Christmas of 2011.
There were some interest to investigate what the wave heights at these breakwater were during
“Dagmar” and to which extent harvesting of kelp may have caused larger waves than without
harvesting.
The kelp harvesting company FMC Biopolymer expressed willingness to give information on their
harvesting of kelp outside the mentioned harbors prior to “Dagmar”. The Norwegian Coastal
Administration will give information on the breakwater at Kvalsvik and the damages during and repair
work after “Dagmar”. A visit to this breakwater is envisaged. The Norwegian meteorological Institute
will give hindcast data on the wave conditions during “Dagmar” at specific points in deep water
outside the area of interest..
During the project work the student shall familiarize himself with kelp , Laminaria hyperborea, how
much is normally harvested in a kelp field and the wav e damping effect of kelp.
During the Master thesis the student shall calculate by the use of a computer program how the wave
heights and direction will change toward the mentioned harbors if there had been no kelp. The
influence of kelp on the wave heights shall thereafter be estimated. Finally the observed damage
effects on the breakwaters should be compared with the estimated damage from the wave height
calculations.
Type: Numerical modelling using commercial software
Prerequisites: TBA4265 Marine Physical Environment ,
Contact person at the department: Øivind A. Arntsen, [email protected]
Supervisors: Raed Lubbad , Øivind A. Arntsen, Alf Tørum
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
5
Figure 1. Extract from the sea map.
Kvamme small
boat harbour
Kvalsvik
harbour
Runde
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
6
9.1.5 Determination of wave slamming forces from measured data
Experiments have been conducted in the Large Wave Flume at the ForschungsZentrum Küste
(Hannover, Germany). During these experiments a truss structure has been exposed to forces from
breaking waves, and the response has been measured. Such truss structures could be used as support
structures for offshore wind turbines in shallow waters, and it is important to understand the loads
properly, in order to design an efficient structure.
The goal of this project is to find the forces acting on the structure from the responses. This is not
trivial, since the slamming forces are of very short duration, but still show a
characteristic time history. Here the exact form of this force time-history is
of interest. In order to obtain it, in this project the Duhamel integral
approach will be used, and the force (input) will be numerically optimized,
such that the response (output) is as close as possible to the measured
response.
Alternatively, the frequency-response-function approach or modal methods
can be used. The measurements include hammer pluck tests at different
locations, and excitation from regular non-breaking waves, which can be
used for these analyses.
This project will enable the students to gain experience in state-of-the-art
analysis of structural response measurements in offshore engineering.
The project work is assumed to be continued in a thesis, in which
the force reconstruction method will be further improved.
Prerequisites: Basic knowledge of structural analysis,
Wave forces
Task type: Literature study, Data analysis
Number of students: 1-3
Contact person at NTNU: Øivind Arntsen,
Co-advisor: Alf Tørum, [email protected];
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
7
9.1.6 Composite breakwater
A composite breakwater may be an attractive breakwater concept for deep water, say 30 – 50 m.
Figure 1. The caisson may be a plain front wall or may have a circular form, as indicated in Figure 1.
The circular form may be an advantageous form because the wave pressures and internal pressures are
taken by axial forces. Wave heights in the range Hs = 6 – 11 m and peak periods in he range Tp = 14 –
17 s should be considered.
Figure 1. Conceptual sketch of a composite caisson breakwater.
Annette Jahr (2010), Tørum et al. (2011), carried out a study of the wave forces on a composite
breakwater using only regular waves.
Research:
During the project work the student shall familiarize him/herself with the problem area and with
previous investigations, including some calculations to be decided later. During the master thesis
work in the spring semester 2013 the student shall carry out experiments to investigate further the
wave forces from irregular waves on the circular caissons. For comparison the student shall also carry
out tests on a plain wall caisson. Although the study is general the following prototype conditions
should be kept in mind:
Water levels: ± 0; Sea bottom at: – 55 m; Caisson crest height: + 12.5 m; Caisson bottom: - 25 m
Two rows of circular cylinders, each with a diameter D = 20 m, filled with stone/gravel/sand. Concrete
wall thickness 50 cm. Core material: 0 – 1000 kg; Wave heights: Ultimate limit state (ULS): Hs = 8.4
m, Tp = 15.8 s ; Load combinations: 1.0G+1.3E (G = dead weight load, E = environmental loads);
Accident limit state (ALS): Hs = 10.4 m, Tp = 17.3 s; Load combinations: 1.0G+1.0E.
References:
Jahr, A. (2010): Composite breakwater with circular caissons. MSc thesis, NTNU, June 2010.
Tørum, A., Jahr, A. and Arntsen, Ø. (2011): Wave forces on a composite breakwater with circular
cylinder caissons. Sent for possible publication.
Task type: Literature survey, calculation and laboratory experiments
Prerequisites: TBA4265 Marine Physical Environment, TBA4145 Port and Coastal facilities or
similar.
Number of students: 1
Contact person: Alf Tørum, [email protected] / Øivind A. Arntsen [email protected]
30 – 50 m 20 – 30 m
Plan view
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
8
9.1.7 Floating breakwaters
Floating breakwaters has an advantage over fixed wave absorbers in areas with great depth and limited
wave exposure. The cost of building a conventional breakwater increases significantly with water
depth and for a number of marinas along the Norwegian coast, these solutions can be completely
obsolete. The purpose of a wave absorber is to reduce the wave height on the leeward side relative to
the incoming waves. Reduction in wave height inside the breakwater occurs either because the wave
loose energy by breaking and the energy passes into turbulence or by that the breakwater reflects the
wave.
The project work fall 2013 the candidate shall perform a literature survey and provide data on how a
caisson type submerged breakwater behaves and calculate reflection and transmission coefficients, and
suggest possible modifications that can lead to improved wave protection. Anchoring systems,
mooring forces, links and fender systems between elements may also be considered. Use of REEF3D
for CFD and/or WAMIT for potential flow approach.
In the master thesis work, there could be several ideas to follow, depending on the results of the
project and the interest of the master student. Here we suggest the following: The combination of a set
of submerged breakwaters and a floating breakwater shall be tested in the laboratory. Floating
breakwaters become inefficient when the breakwater width is less than half the wavelength. This
means that if the incoming wave has a wavelength of 20 m the breakwater has to be 10 meters wide to
be most effective. When waves pass over submerged breakwaters a nonlinear process very often
transforms the waves by making the wavelength shorter (approx by a factor 0.5) , but not necessarily
reduce the wave height enough. Since the wave length is reduced the 10 m wide floating breakwater
may no be efficient up to 40 m long incoming waves. So far these are speculations. Therefore we will
set up a test facility in a wave flume to investigate this. And also see if the data fits results of the
numerical models.
Preliminary experiments (S. Yu. Kuznetsov, 2012)
Physical mechanisms of secondary waves formation in coastal zone and possibility of its application to
coastal protection, Copedec 2012, 20-24 Feb 2012, Chennai, India.
Task type: Literature survey, numerical modelling, calculation and laboratory experiments.
Prerequisites: TBA4265 Marine Physical Environment, TBA4145 Port and Coastal facilities or similar.
Number of students: 1
Contact person: Øivind A. Arntsen [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
9
9.1.8 CFD modeling of OWC wave energy converters
An OWC (Oscillating Water Column) device consists of an air filled chamber, which is partially
submerged in the ocean. Due to the wave motion of the sea, the water column inside the chamber
moves up and down, initiating oscillatory airflow in the upper part of the chamber. The air exits and
enters the chamber through a Wells turbine, which is optimized for low-pressure air flow and always
rotates in the same direction.
The hydrodynamics and wave kinematics around and inside the OWC device heavily influence its
performance. In this project, a simplified 2D setup will be used for numerical investigations of the
OWC device. The numerical wave tank REEF3D (www.reef3d.com) will be used for this task. The
level set method is employed for the calculation of the complex free surface. The flow problem is
solved as a two-phase flow of water and air, with the free surface represented by the interface between
the two phases. With this method, it is possible to calculate the motion of the free water surface and
the air flow inside the OWC chamber in great detail.
During the project the 2D model will be implemented and first simulations will be performed.
The project work is assumed to be continued in a thesis, during which parameters of the design will be
varied, and the power production of the turbine will be studied in more detail.
Prerequisites: TBA4265 Marine Physical Environment, CFD
Task type: Literature study, CFD Modeling
Number of students: 1
Contact person at NTNU: Øivind A. Arntsen, [email protected]
Hans Bihs, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
10
9.1.9 Wave propagation over rough topography
Numerical wave transformation models (e.g. Spectral and
Boussinesq models) are implemented in software packages such
as MIKE21, Delft3D/SWAN, etc. These software packages are
developed mainly for gentle variable bottom topography. The
question becomes how well they can predict wave
transformation on a rugged coast like the Norwegian coast.
In the project work the student shall familiarize himself/herself
with the use of MIKE21. In addition, the student shall develop
routines to analyse wind and wave data provided by the
Norwegian meteorological institute in order to establish the deep
water sea state.
The project work is assumed to be continued in a thesis where the task is to use MIKE21 to transfer
the deep water waves to a specific location on the Norwegian coast. The student will compare the
results from the spectral wave models with those from the Boussinesq models and if possible with
field data.
Type: Numerical modelling using commercial software
Prerequisites: TBA4265 Marine Physical Environment ,
Contact person at the department: Raed Lubbad, [email protected]
Supervisor: Raed Lubbad , , Øivind A. Arntsen
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
11
9.1.10 Numerical modelling of sediment transport and coastline evolution
The coastal zone is an extensively used area for many activities and industries. Around half of the
world’s population live or work within one or two hundred kilometres of the coastline. Because of the
high population density and the extensive development in these areas, it is very important to know the
dynamics of the forcing and response of the coastal system involved and how to model them for an
appropriate choice and design of measures.
There is a number of numerical models present that are available for predicting coastline evolution
using different formulations. Some software packages such as Delft3D, TELEMAC etc. are available
through open source whereas some packages such as MIKE21 are available commercially. The
available models are also classified based on their temporal and spatial scale of application. Delft3D
and MIKE21are applicable over a period of months to decades and can be applied to coastlines of
kilometres whereas models such as XBeach are applied over a period of days to months and a cross a
distance of several hundred meters only.
In the project work the student shall familiarize himself/herself with the use of MIKE21 or Delft3D.
In addition, the student shall develop routines to analyse wind and wave data provided by the
Norwegian meteorological institute in order to establish the deep water sea state
The project work is assumed to be continued in a thesis where the task is to use MIKE21or Delft3D to
study the sediment transport and the coastline evolution at a specific location on the Norwegian coast.
If possible, the student will compare the simulation results with field data.
Type: Numerical modelling using commercial software
Prerequisites: TBA4265 Marine Physical Environment ,
Contact person at the department: Raed Lubbad , [email protected]
Supervisor: Raed Lubbad, Øivind A. Arntsen.
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
12
9.1.11 Study of Wave-Current-Structure Interaction using Computational Fluid
Dynamics
A good description of the incoming wave field is important for a safe and economic design of
offshore structures. The wave-structure interaction causes changes in the wave properties. Wave
runup on a structure is one such phenomenon of interest. Wave runup involves an amplification of
the wave amplitude in the proximity of the structure. This has consequences on the safety and
strength of the structure due to wave overtopping and wave slamming effects that can occur. The
presence of a current in addition to the wave field makes the problem more complex with an
additional force component playing a role. The study of wave runup on offshore structures is thus an
important aspect of offshore design. Application of Computational Fluid Dynamics (CFD) to such a
scenario is an interesting approach as it provides a detailed description of the fluid flow around the
structure. This provides good insight into the wave-current-structure interaction and helps in better
understanding the hydrodynamics involved in the process.
The objective of this project work is to use a CFD code being developed at the Department of Civil
and Transport Engineering to evaluate the wave runup on a cylinder in a numerical wave tank. The
wave runup in presence of only waves and combination of waves and current is to be studied. The
change in runup with change in wave properties and cylinder size is also to be explored. The results
obtained from the CFD code are to be compared to the experimental results.
Number of students: 1
Task type: Numerical analysis
Contact Persons: Hans Bihs ([email protected]) , Øivind A. Arntsen ( [email protected]) ,
Arun Kamath ([email protected]),
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
13
9.1.12 CFD simulations to analyse wave impact and uplift forces on a
horizontal platform
The phenomenon of wave impact on structures is important from the point of view of design,
stability and safety of a marine structure. Understanding the action of extreme waves under a
horizontal structure located close the free surface can help in better design for these conditions.
Decks of coastal and marine structures are built of many independent units placed together. The
failure of these decks could be either due to the global failure of the whole platform or due to the
local failures of the individual members. Wave impact can cause high local forces, which can cause
failure of the individual members. Wave slamming involves a rapidly varying peak uplift pressure and
a slowly varying uplift pressure. The forces resulting from the rapidly varying peak pressure have can
cause local failure of the members of a platform.
This project aims at simulating wave-structure interaction with a focus on uplift forces on a thin
plate under the action of a solitary wave. The study will be carried out using a CFD model adapted to
be a numerical wave tank, developed at the Department of Civil and Transport Engineering. The
relation between the freeboard and the maximum uplift force is to be explored. The results obtained
from the numerical simulations are to be compared with the experimental data.
Number of students: 1
Task type: Numerical analysis
Contact Persons: Contact Persons: Hans Bihs ([email protected]) , Øivind A. Arntsen (
[email protected]) , Arun Kamath ([email protected]),
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
14
9.2 Offshore Marine Civil Engineering
9.2.1 Free spanning pipelines
Pipelines on uneven seafloor will exhibit free spans in
case they cannot follow the geometry of the sea bottom.
In this project the student shall investigate the conditions
for and behaviour of free spans and investigate solutions
to limit the free spans. Of particular concern is the analysis of pipelines under free spanning
conditions. The project work might be continued in a master thesis project.
Prerequisites: TKT4201 Structural dynamics or TBA4275 Dynamic response or similar
Recommended supplementary course: TBA4116 GEOTECH ENG AC, TKT4108 DYNAMICS AC
Task type: Calculation task, numerical modelling, literature survey
Number of students: 1
Cooperation with: University of Stavanger
Contact person: Ove T Gudmestad, [email protected]
Contact person at NTNU: Knut V. Høyland, [email protected]
9.2.2 Marine Operations in Cold Climate
Marine operations taking place in cold climate regions have to take into
consideration the specifics of the climatic conditions:
During installation the work season may be limited due to ice and
drifting ice. During the fall season polar low appears and
unpredictable weather makes planning for installation difficult.
Icing might occur relatively early during the fall.
During operations of the production from an offshore oil and gas
field, the weather conditions might pose severe limitations to
operations as icing and ice conditions may pose specific
requirements.
The student shall assess the challenges and limitations of carrying marine
operations in cold climate. The installation and operation phases shall be
assessed and the ice free as well as the ice covered seas shall be discussed.
The project work may be continued in a master thesis project.
Prerequisities: AT 327 Arctic Offshore Engineering,
Recommended supplementary course:, TKT4108 DYNAMICS AC , TMR4130 RISK SAFETY MAR
TRAN
Task type: Calculation task, Literature survey
Number of students: 1,
Cooperation with: University of Stavanger
Contact person: Ove T Gudmestad, [email protected]
Contact person at NTNU: Knut V. Høyland, [email protected]
9.2.3 Field development in cold climate
Sub Title: Aspects that influence on offshore hydrocarbon field development scenarios in cold climate
regions with emphasis on the Barents Sea
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
15
Oil and gas development in cold climate areas represent challenges additional to those experienced
further south. The project will emphasis on aspects related to the physical environment, on flow in
pipelines and on technology for field development. Risk analysis and selection of safety level shall be
important part of the discussions. Economical assessments shall be conducted to understand the
sensitivity to different development schemes
Prerequisities: TBA4265 Marine Physical Environment
Key words: Barents Sea
Type of project: Literature + analytical assessment of hydrocarbon development schemes
Number of students: 1 to 2
Cooperation with: University of Stavanger
Contact person: Ove T Gudmestad, [email protected]
Contact person at NTNU: Knut V. Høyland, [email protected]
Continuation of project: Can be extended into Master Thesis.
9.2.5. Installation of offshore wind turbines
Sub Title: Methods for efficient installation of wind turbines in harsh offshore climate
Installation of offshore wind turbines represents a very costly element. In open seas waiting on
weather can increase the costs substantially and cause wind farms to become non-economical
It is therefore necessary to compare different methods for installation and investigate new methods
It should be noted that new methods that can reduce waiting on weather could make a substantial
contribution to the economic feasibility of offshore wind farms.
Prerequisities:: TBA4265 Marine Physical Environment
Key words: Offshore wind turbines, marine operations, lifting
Type of project: Literature + analytical assessment of installation methods for offshore wind turbines
Number of students: 1to 2
Cooperation with: University of Stavanger
Contact person: Ove T Gudmestad,, [email protected]
Contact person at NTNU: Knut V. Høyland, [email protected]
Continuation of project: Can be extended into Master Thesis
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
16
9.3 Arctic Technology (ice mechanics and ice actions on marine structures/vessels)
When designing coastal and marine structures (including vessels) the actions from floating ice covers
often gives the most important environmental actions. There are mostly three scenarios that can be
critical: icebergs, ice ridges and level ice. The suggestions below are offered within the SAMCoT
project (http://www.ntnu.edu/samcot ).
9.3.1 Level ice action, ice-induced vibrations and uncertainties.
It is possible to choose a topic with joint supervision from Veritas (DNV) or Reinertsen. Contact
person at NTNU: Knut V. Høyland, [email protected] or Sveinung Løset,
Ice induced vibrations – a tool for prediction of cyclic loading due to ice crushing (with
Morten Bjerkås from Reinertsen)
Variability and uncertainty related to measured ice properties (DNV/ NTNU)
Analyse data about dynamic ice –structure interaction from laboratory tests (DNV/NTNU)
Numerical model for ice-induced vibrations (DNV/NTNU)
Velocity effects of high pressure zones in ice-structure interaction. (with Ole Øiseth K-Tek)
Ice induced vibrations of offshore structures (with Ole Øiseth K-Tek)
Ice mechanical experiments in NTNU ice-lab, e.g. cyclic testing.
9.3.2 Ice ridges and ice ridge actions
It is possible to choose a topic with joint supervision from Veritas (DNV). Contact person at NTNU:
Knut V. Høyland, [email protected].
Ice ridge action on offshore structures - ice ridges as extreme ice features
Ice ridge action on offshore structures – material modeling FEM (SAMCoT)
Ice ridge action on offshore structures – experiments in NTNU ice-lab (SAMCoT)
Ice ridge action on offshore structures – analysis of ice ridge geometry (how deep and how
wide is the consolidated layer)
Ice ridge action on offshore structures - How to produce sale-model ice ridges
Ice ridge action on offshore structures - Ice rubble formation on sloping structures
9.3.3 Icebergs
It is possible to choose a topic with joint supervision from Veritas (DNV). Contact person at NTNU:
Sveinung Løset, [email protected] .
Drift of icebergs in the Barents Sea
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
17
9.3.4 Icing
It is possible to choose a topic with joint supervision from Veritas (DNV). Contact person at NTNU:
Sveinung Løset, [email protected].
Marine icing
9.3.5 Development of laboratory or full-scale procedures and instrumentation.
Contact person at NTNU: Knut V. Høyland, [email protected] or Sveinung Løset,
Full-scale ice forces from MRU, compare full-scale and model scale data (DNV/NTNU)
Instrumentation of ice growth tank and characterization of ice
Develop a practical and accurate method to determine the density of sea ice
Study the reliability and accuracy of ice pressure sensors (tactile pressure sensors)
9.3.5 Ice thickness and level ice properties Contact person at NTNU: Knut V. Høyland, [email protected]
Level ice thickness in the Van Mijen fjord in Svalbard, analysis of existing data and / or
perform new measurements on Svalbard / UNIS
Ice texture and the brine and gas volume in first-year sea ice – seasonal development,
measurements on Svalbard / UNIS
In most of these task it is possible to have a part-time stay at UNIS on Svalbard. Please get in
touch with Sveinung Løset / Knut V. Høyland if you are interested in this.
9.3.6 Ship-ice interaction: Analysis of full-scale data
A better understanding of the interaction processes between ship and ice allow us to improve our
models for ships operating in ice infested-waters, e.g. transporting, station keeping, performing ice
management, etc.
Full-scale data from several surveys with the
icebreaker KV-Svalbard will be available for this
study. In additions to the ship measurements
(movements, propulsion, etc.), video data from
several cameras mounted on the ship are
available. The video records capture the ice
conditions in front of the ship and also the
interaction processes between the incoming ice
and the ship bow.
The student should analyse the video data and try
to evaluate the icebreaking patterns, movement of
the ice floes interacting with the ship, correlation
between the ice conditions and ice resistance to
the ship motion, etc.
During this project the student will acquire
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
18
knowledge on the underlying processes of ship-ice interaction. The student shall familiarize
himelf/herself with data analysis techniques and especially the image analysis.
Recommended subject: TBA4265 Marine Physical Environment; AT327 Arctic Offshore Engineering
Key words: Arctic offshore
Type of project: Data analysis (Image analysis)
Number of students: 1 to 2
Cooperation with: SAMCoT
Contact person at NTNU: Raed Lubbad, [email protected]
Continuation of project: Can be extended into a Master Thesis
93.7 Transport of ice along a structure
Numerical simulations of a floater (ship or buoy) in ice involve modelling a wide range of physical
processes related to the dynamical coupled floater-ice-fluid interaction, such as impacts, friction,
buoyancy, hydrodynamics, fracture and fragmentation of ice. The task should focus on how fluid flow
models, e.g. FLUENT, can be used to model the transport of broken ice pieces along the hull of a
floater. The numerical results should be compared with model-ice test results from the Hamburg Ice
Basin, Germany. This gives the student an excellent opportunity to validate his simulations. The
student will be offered a summer job in 2012 to work on the data as well as a visit to the Hamburg Ice
Basin.
Recommended subject: TBA4265 Marine Physical Environment; AT327 Arctic Offshore Engineering
Key words: Arctic offshore
Type of project: Numerical calculations
Number of students: 1 to 2
Cooperation with: SAMCoT
Contact person: Sveinung Løset/Raed Lubbad
Continuation of project: Can be extended into a Master Thesis
9.3.8 Analysis of Model Ice Basin Tests of a ship in broken ice
A number of laboratory tests are performed with two vessels in broken ice in the Hamburg Ice Basin,
Germany. The data from the tests will be made available for the student and he shall perform analysis
of how the ice concentration, drift speed and floe size affect the load on the vessel. As an option the
student may also study the effect of the characteristics (hull shape) of the two vessels on the loads. The
student will be offered a summer job in 2012 to work on the data as well as a visit to the Hamburg Ice
Basin.
Recommended subject: TBA4265 Marine Physical Environment; AT327 Arctic Offshore Engineering
Key words: Arctic offshore
Type of project: Numerical calculations
Number of students: 1 to 2
Cooperation with: Dynamic Positioning in Ice
Contact person: Sveinung Løset
Continuation of project: Can be extended into a Master Thesis
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
19
9.4 Offshore Wind Turbines
9.4.1 Certification analysis of a full-height lattice tower support structure
The Norwegian Research Centre for Offshore Wind Technology
(NOWITECH) is developing a 10 MW bottom-fixed reference wind
turbine. Our group is responsible for the design of the support structure,
which will be a novel lattice tower (see image).
This lattice tower has been analysed with special wind turbine simulation
software in the time-domain (DNV Sesam, FEDEM Windpower, GL
Garrad Hassan Bladed) and our own tools for pre- and postprocessing
(MATLAB). We have optimized the weight of the structure while
respecting the design limits. Unfortunately, a 10 min loadcase simulation
takes around 1 hr of simulation time, so the tower has been designed by
considering only a few loadcases. This means that the fatigue damage is
only estimated roughly.
During this project the student shall run the full certification suite of
loadcases from the IEC 61400-3 standard and check if the structure fulfills
the design limits (ULS and FLS), and by what margin.
This project will enable the students to gain experience in state-of-the-art
engineering practice for offshore wind turbine projects.
The project work is assumed to be continued in a thesis, in which
simplified methods for fatigue analysis of offshore wind turbines shall be
developed and tested.
Prerequisites: Basic knowledge of structural analysis
Task type: Literature study, Simulation, Postprocessing
Number of students: 1-2
Contact person at NTNU: Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
20
9.4.2 Component design for a future 10 MW offshore wind turbine
NOWITECH is designing a 10 MW wind turbine for
use in both local and international research projects on
large offshore wind turbines. The existing design
includes a 141 m diameter rotor, the nacelle frame, and
a 160 m high lattice tower (jacket). However, key parts
of the load path between the rotor and seabed have not
yet been designed; specifically, the rotor hub, the main
shaft, the transition piece between the nacelle frame and
tower legs, and the pile sleeves at the base of the tower.
The task is to design and analyze one or more of these
components.
The methods used for the dynamic analysis of wind
turbine structures are similar to those used in the
dynamics of bridges, offshore structures, or buildings –
though on wind turbines, the large, spinning rotor makes
the dynamic loads of even greater importance.
Students with a background or interest in these fields will
find the present project to be a natural fit. This is also an
opportunity to gain exposure within the research
community at NTNU, and the industry partners of
NOWITECH.
NOWITECH is a research centre for offshore wind technology. It is based in Trondheim, and includes
NTNU, Sintef, IFE, and industry partners (see http://www.sintef.no/projectweb/nowitech/).
Prerequisites: Knowledge of structural analysis and structural design
Task type: Literature study, Modeling with wind turbine analysis software,
Simulations
Number of students: 1-4
Contact person at NTNU: Karl Merz, [email protected]
Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
21
9.4.3 Sensitivity analysis of offshore structures
Offshore structures contain many members and there
are a lot of parameters that can be changed. In order to
have an economic design, the structures should ideally
be designed for each different site individually.
However, this is time-consuming and expensive, and
designers would very much prefer if they could use a
good design for a lot of different site conditions (e.g.,
different water depths and wave climates) with only
small changes. For example, for a typical jacket for an
offshore wind turbine, one possibility is to increase
the length of the piles at the bottom (stick-up).
It is important for designers of such structures to know
how much the performance (e.g., load distributions or
fatigue lifetime of joints) changes when changing the
design. Sensitivity analysis is a collection of methods
and tools for obtaining such information, and is
widely used in engineering practice.
In this project the student shall analyze the dynamics
of an offshore wind turbine support structure using
computer simulations.
A few parameters of the design (e.g., pile stick-up length, bottom leg distance) shall be varied, and
both local and global sensitivity analysis shall be performed. Local sensitivity analysis is based on
calculating gradients, i.e., assuming a linear relationship between parameter changes and performance
changes. The goal is to assess how accurate this method is. Global sensitivity analysis will be
performed by fitting a simple nonlinear (e.g., quadratic) curve to the simulation results.
The project work is assumed to be continued in a thesis.
Prerequisites: Basic knowledge of structural analysis and structural design
Task type: Literature study, Simulations, Statistical analysis
Number of students: 1-2
Contact person at NTNU: Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
22
9.4.4 Mooring systems for floating wind turbines
Floating wind turbines are an interesting option for
deep waters (> 60m). Being floating structures, these
need a stationkeeping system. The most common
option is a catenary mooring system, in which a chain
provides a restoring force through its self-mass. If the
floater moves, more chain is lifted up from the ground,
increasing the restoring force, i.e., the mooring system
has a nonlinear stiffness characteristic. Especially for
water depths <100 m this nonlinearity can be quite
strong and the question is how a good mooring system
has to be designed under these conditions.
In this project the student shall implement a simulation
model in offshore analysis software (DNV Sesam) and
perform time-domain simulations and a parametric
study.
The wind turbine will be modelled as a rigid body with
six degrees of freedom. Changing the parameters of the
mooring system, the goal is to minimize the movements
of the structure, while keeping the mooring line
tensions well below the breaking strength.
This project will provide the student with state-of-the-
art experience in the design of offshore structures and
the use of DNV software.
The project work is assumed to be continued in a thesis.
Prerequisites: Basic knowledge of wave forces and hydrodynamics
Task type: Literature study, Simulations
Number of students: 1-2
Contact person at NTNU: Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
23
9.4.5 Second-order wave forces on floating wind turbines
Linear wave theory is characterized by closed orbits, and a
floating structure will experience a zero mean force. However,
real waves are nonlinear, and second-order nonlinear waves
introduce both a mean drift force and an additional low-
frequency excitation. Because there is typically little damping in
the system, this can result in relatively large motions of the
structure.
In this project these effects and their importance shall be studied
for a typical floating wind turbine. The turbine will be
implemented in DNV Sesam software as a simple rigid-body
with six degrees of freedom. The software calculates the second-
order wave forces in time-domain simulations.
The student shall implement a numerical model, study a number of different loadcases and analyze the
importance of second-order wave forces for floating wind turbines.
The project work is assumed to be continued in a thesis.
Prerequisites: Basic knowledge of wave forces and hydrodynamics
Task type: Literature study, Simulations
Number of students: 1-2
Contact person at NTNU: Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
24
9.4.6 Simplified dynamics of offshore structures
Offshore wind turbines consist of two major parts:
the wind turbine itself, and a support structure. The
dynamics of the wind turbine is quite complex,
being governed by nonlinear, time-dependent
aeroelastic effects, rotational machinery, and a
control system. The dynamics of the support
structure, however, is relatively simple. In fact, in
the oil & gas industry support structures are
typically designed with simplified methods (e.g., in
the frequency domain), at least for basic design
purposes.
In this project the student shall investigate simplified approaches for characterizing the dynamics of
support structures for offshore wind turbines (e.g., jacket structures). These can be transfer functions,
frequency-domain methods, or black-box statistical approaches. These methods shall be implemented
(e.g., using MATLAB) and their predictions shall be compared with time-domain simulations in finite
element software.
The project work is assumed to be continued in a thesis.
Prerequisites: Structural dynamics
Task type: Literature study, Simulations, Statistical analysis
Number of students: 1-2
Contact person at NTNU: Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
25
9.4.7 Topology-based optimization of an offshore jacket for a wind turbine
Offshore wind turbines for medium water depths (30-60m) are typically designed with jacket-type
support structures. These jackets consist of welded tubular steel members in four legs and a number of
X-braces, and are relatively complex structures. Each member is characterized by its diameter and
thickness. The main design driver is fatigue, both from wave loading and from vibrations due to the
rotating turbine on top. Because there are so many parameters with these structures, current designs
use a lot of steel and are relatively expensive. It is one of the key challenges for offshore wind to
reduce the weight of these support structures.
Our group has worked on optimization of support structures for some time, and has developed models,
algorithms and pre- and postprocessing tools for this task. Up to now, however, the optimization has
only considered diameters and thicknesses, but the location of the nodes (defining the heights and
aspect ratios of the X-braces) has always been fixed.
During this project the student shall extend the existing optimization tools such that also the topology,
i.e., the locations of the nodes can be changed. The work will be done in cooperation with one of the
leading designers of offshore wind turbine jackets, OWEC Tower AS (Bergen). Students will gain
insight into actual structural design practice in the growing offshore wind industry.
The project work is assumed to be continued in a thesis.
Prerequisites: Structural analysis
Task type: Literature study, Programming (MATLAB), Simulation
Number of students: 1-2
Contact person at NTNU: Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
26
9.4.8 Implementation of a flexible beam in the multi-body inertial formulation
Wind turbines are typically modeled with beam elements, and these are used both for the blades and
for the tower. The resulting structural model is used for design, optimization and certification of the
turbine. This is a standard FE problem, but since the blades are rotating, a multi-body formulation is
needed, and there do not exist many analysis codes with this capability and features for realistic wave
and wind loading. The existing codes are relatively simple and use the co-rotational formulation which
assumes small elastic deformations.
A more accurate approach is the inertial formulation, in particular the one developed by Park and
colleagues at NASA in the early 90s, where it was successfully used for the analysis of satellites and
space stations. This approach uses global inertial coordinates, implements the rotational constraints by
a penalty method, and uses a nonlinear strain formulation. It is well documented in a number of
articles and PhD theses, and lends itself excellently to a parallel implementation.
During this project the student shall implement the beam element developed by Park and colleagues,
either in MATLAB, Fortran or another common programming language, and validate it by simulating
a rotating beam that is spinning up.
The project work is assumed to be continued in a thesis.
Prerequisites: Structural analysis
Task type: Literature study, Programming (MATLAB or other language)
Number of students: 1-2
Contact person at NTNU: Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
27
9.4.9 Alternative materials for offshore support structures
Offshore structures are normally constructed from ductile carbon steel.
However, different materials such as aluminium, concrete, or high-
strength steels could be an alternative. For wind turbine support
structures the use of such alternative materials has not been evaluated in
sufficient detail.
In this project, the student shall analyze a simple design for an offshore
wind turbine support structure using such alternative materials, and
compare it with a traditional design using steel, assessing performance
and costs.
The project will be performed in cooperation with relevant Norwegian
companies (e.g., Norsk Hydro or Dr. techn. Olav Olsen).
The project work is assumed to be continued in a thesis.
Prerequisites: Structural analysis
Task type: Literature study, Modeling and Analysis
Number of students: 1-2
Contact person at NTNU: Michael Muskulus,
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
28
9.4.10 Cost of offshore wind energy
When designing and optimizing a support structure for an offshore wind turbine, it is very important to
have a good estimate of the manufacturing, installation and maintenance costs of the structure.
Although quite a lot of data exists, a good cost model does not exist at the moment, and the structural
design is often only optimized by minimizing the weight of the structure.
In this project the student shall compile the known data and literature, and come up with a suggestion
for the typical costs of jacket type support structures for offshore wind turbines. Since such a model
will include some uncertainty in the parameters, an important goal is to identify which parameters are
of major relevance (cost drivers) and which are not.
The project work is assumed to be continued in a thesis.
Prerequisites: Structural analysis
Task type: Literature search and study, Statistical analysis
Number of students: 1
Contact person at NTNU: Michael Muskulus,
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
29
9.4.11 Improved O&M strategies for a large offshore wind park
Operation and maintenance (O&M) contributes a significant part (15 percent and more) to the total
cost of an offshore wind turbine. After failure of a subsystem, a maintenance crew needs to be
transported to the turbine, which is not always possible due to wave height limitations. Repairs need a
certain time and maximum wind speed, and possible weather windows can be rather short, such that
repairs need to be scheduled cleverly. Even then, unforeseen changes in weather conditions can make
it necessary to interrupt a repair or maintenance action and resume it at a later time.
A stochastic simulation has been implemented in MATLAB and allows to simulate the operating
phase of an offshore wind park. The aim of this project is to improve this tool. In particular, currently
the weather forecast is assumed to be 100 percent reliable for a certain numbers of hours, and
completely unreliable beyond that. Also the current scheduling strategy is relatively simple (see image
above). Failure rates are assumed to be constant during the whole lifetime of the wind park, which is
also unrealistic. One or more of these features shall be improved.
After improving the tool, the main goal is to analyze how much cost can be saved for better
maintenance strategies. This project will be done in close cooperation with SINTEF Energy.
The project work is assumed to be continued in a thesis.
Prerequisites: Basic knowledge of simulation and statistics
Task type: Literature study, Programming (MATLAB or other language), Simulation
Number of students: 1
Contact person at NTNU: Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
30
9.4.12 A simulation model for marine growth
Marine growth is the common name for a
number of different organisms that grow on
offshore structures. The growth and its mass
can be significant and this changes the
dynamics of the structure – so that offshore
designs need to be checked against respecting
the design limits with marine growth included.
The relevant offshore standards prescribe a
certain constant thickness of marine growth
(e.g., 100 mm for the North Sea in the DNV
rules). However, a special feature of marine
growth is that it actually changes over time.
In this project the student shall implement a simple stochastic computer model (e.g., in MATLAB) for
the growth of marine growth on a submerged steel structure and compare it with existing data from
offshore wind and wave energy projects. The project will be done in close cooperation with the
Department of Biology (NTNU).
The project work is assumed to be continued in a thesis, in which the impact of the marine growth on
the dynamics of a wind turbine support structure shall be investigated.
Prerequisites: Basic knowledge of simulation and statistics
Task type: Literature study, Data Analysis,
Programming (MATLAB or other language)
Number of students: 1
Contact person at NTNU: Michael Muskulus, [email protected]
Marin byggteknikk – Prosjekt og masteroppgaver 2013/2014 – Studieretning K og BA
Marine Civil Engineering – Project and Master Theses suggestions - 2013/2014
31
9.4.13 Influence of top weight on support structure cost for an offshore wind turbine
New superconducting generator technology makes it possible to reduce the weight of the rotor-nacelle-
assembly of an offshore wind turbine significantly. However, this comes with a price – and a higher
reduction in weight will increase the cost more. Since the weight of the generator can be reduced more
or less freely by this technology (up to a certain minimum weight), it is important to know how much
cost can be saved for the support structure, and where the optimum lies.
During this project, the student shall analyze by simulation how smaller top weight influences the
dynamics and the resulting fatigue damage of a typical offshore wind turbine.
The project will be done in cooperation with DTU Wind Energy, who is a world-expert on
superconducting technology for offshore wind turbines.
The project work is assumed to be continued in a thesis.
Prerequisites: Structural analysis
Task type: Literature study, Parameter study, Simulation
Number of students: 1
Contact person at NTNU: Michael Muskulus, [email protected]