Influence Analysis of Coupling between Tension and Torque in Single Armoured Cables

• Main Author: Malm, Joacim
• Format: Others
• Language: English
• Published: Blekinge Tekniska Högskola, Institutionen för maskinteknik 2016
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-12173

When single armoured cables are under tension they will start to twist in direction depending on the lay angle of the armour wires on the cable. The cables start to twist due to the induced torque that appear within the cable and this induced torque can in the worst-case cause loops and kinks on the cable. These negative consequences are the subject to exploration by implementing a known analytical solution developed by Lanteigne (1985), into an external function in OrcaFlex which is a finite element software program capable of solving 3D non-linear arbitrarily deflections. It is specifically designed to be used for doing static and dynamic analysis on marine and offshore structures. Different cable installation scenarios cases have been created and some of these are validated through experimental testing at the testing facility at ABB, Karlskrona. The results from the different cases shows a good representation of the real twist and rotation of the cable. However, results also conclude that the induced torque that appear within the cable was not possible to be correctly represented by applying external torque from an external function. These results are important for further research within the area and they help creating a greater understanding of torque related problems with single armoured cable under tension.