Analys av risk för utmattningsskader på högspänningskablar vid fogning till havs

Typ
Examensarbete på grundnivå
Program
Maskinteknik 180 hp (högskoleingenjör)
Publicerad
2023
Författare
El-Zein, Alexander Hani
Parviz, Erfan
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Global conditions have forced humanity to look for new methods to generate renewable energy. At the forefront of this innovation is NKT HV Cables AB in Karlskrona with the promising as well as effective method to generate electricity through wind turbines in areas named Offshore wind turbine parks. Large quantities of electricity are produced through wind turbines that are located at sea which need transportation to land via high voltage cables. To maximize this energy production, more and more wind turbines are located further out at sea which means that high voltage cables need to be jointed on a vessel at sea. The jointing operation can take several days, during this process, the cable is hanging from the vessel which can cause damage. Waves and movement of the vessel can cause bending motions along the cable which can be problematic for a longer period. It is necessary to ensure that no critical damage is induced on these high voltage cables as it can cost the company not only precious time but also a lot of money. NKT has developed a new sensor that can monitor bending variations during a jointing operation. The goal of this thesis is to develop the process and provide graphs used by data from the sensor, that can be analyzed and finally discuss the possible damage. MATLAB is used in order to produce the plots and graphs. 25 plots are presented at the result chapter which show the curvature variations in x and y axis and how the cable bends for one hour surveillance. Rainflow diagram is also presented in this chapter which indicates the number of cycles and corresponding curvature variation. The result and the effect of these cycles and variations is discussed in the last chapter. The accuracy of the result and method is discussed as well. Further, a conclusion and judgement to determine if the result is useful and valid, and whether NKT has been able to achieve their objectives with the project and if the cable has been damaged to a dangerous level.
Beskrivning
Ämne/nyckelord
Citation
Arkitekt (konstruktör)
Geografisk plats
Byggnad (typ)
Byggår
Modelltyp
Skala
Teknik / material
Index