Results |
 
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Results |
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Results from the dynamic analyses of the jack-up are presented in the figures below. The first figure below gives a comparison of the horizontal motion of Leg 1 obtained using time and frequency domain analyses. The second figure presents a comparison of the max/min envelopes of the local-z bending moment distribution in Leg 1, for both time domain and frequency domain analyses.
The results demonstrate close agreement between the time and frequency domain approaches. Discrepancies in the solutions may be attributed to the non-linear p-δ effect, which cannot be captured in the frequency domain. Specifically, the p-δ effect means that lateral displacements of the jack-up platform result in second order overturning moments being generated. The effect is emphasised by the fact that a large proportion of the structure mass is concentrated on the platform deck (the deck elements are almost 4 times as heavy as the leg elements).
Envelopes of Horizontal-Y Motion in Leg 1
Envelopes of Local-Z Moment in Leg 1