Results |
 
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Results |
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The first figure below presents a plot of the effective tension in the winching cable. In general, the overall trend is that the tension increases in a fairly linear manner, which reflects the increasing weight of flexible suspended from the platform. The graph fluctuates continually, due to the node-based nature of the pipe-in-pipe connections – essentially the flexible moves in short strain lines along the rigid elements of the J-tube, rather than following a truly smooth curve. It is also interesting to note the slight increase in tension (deviating from the overall trend) during the analysis – this corresponds to the period where the end fitting moves around the curved section of the tube into the straight vertical section.
The second figure below presents the bending moment at the tip of the flexible (nearest the end fitting). The bending moment is naturally highest as the front end passes through the curved section of the J-tube, but otherwise quite low – e.g. when the flexible is located within the straight upper section of the J-tube.
Effective Tension in Winching Cable
Bending Moment at Tip of Flexible