Research Information System
International Conference on Engineering Technology and Innovation, Sarajevo, Bosnia And Herzegovina, 22 - 26 March 2017, pp.43, (Summary Text)
The offshore industry requires continued development of new Technologies in order to produce oil in regions, which are inaccessible to exploit with the existing technoogies. Tension leg platforms (TLPs) have been used exclusively as production and drilling platforms. TLPs consist of columns and pontoons. The unique feature is the mooring system, which consist of vertical tendons (called “tethers”) which restrain the heave motion. Compliant offshore TLPs are essentially meant for deep oil/gas exploration and are usually constructed on the seashore and then towed down to the particular location for anchorage. They are connected to the sea bed by means of pretension cables.
The increased use of TLPs in deep waters and necessity of reduction of usually high value of pretension make the effect of variable tension in the tether dynamics more significant. This work presents the modal analysis of tethers and TLPs considering the linearly varying tension along the tether length. For the analysis, the TLP which name is SNORRE-A is modelled for environmental conditions. ANSYS-Mechanical APDL program is used for modelling and analysis. The mod shapes and natural frequencies of TLP is obtained and the results are discussed.