Working model 2d crack

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Smith was able to model the flexibility of a jack-up leg realistically as it was acted upon by the simulated wave motions. To re-create the jack-up mechanism, Dr. Smith modelled the guides on either side of the legs as springs with gaps that only became activated at certain points during the simulation.

Then I used a separate driving actuator to simulate the hull motions and push the whole mechanism around. Once the leg and jack-up mechanism were modelled to his satisfaction, Dr.

Smith concentrated on identifying the particular forces to apply and in which combinations. The roll of the platform while being towed actually caused a number of different frequencies to interact upon the legs simultaneously. The three that Dr. Smith was most interested in were the sea wave period which varies with the weather ; a leg's own natural swaying period in the upright position which, for analysis purposes, amounted to an inverted pendulum ; and the leg as a cantilever beam with its own characteristic bending stiffness.

Smith was particularly interested in the torsional or bending moment of the legs. With each simulation, the engineer altered amplitudes and wave frequencies, monitoring the results with the meters on screen and outputting hard copy of this data for further study. Working Model found that the gaps between the pinion guides and the legs themselves could not be ignored. Smith could tell from his simulations the number of bending cycles that occurred per hour was directly associated with increasing fatigue damage.

For short tows, the way the legs of the jack-up were secured had been considered adequate, but what Dr. Smith discovered with Working Model was the gap between the legs and the pinion guide mechanism was still too great, and as the barge rolled in the natural wave environment, the legs underwent more chaotic behaviour; the legs were bouncing off the guides first on one side and then on the other.

Smith and his colleagues concluded that any gap between the legs and the guides was unacceptable, that clamping the legs while in transit was the only way to avoid the fatigue problem. As an example, Dr. Smith pointed to the way he modelled the legs as flexible bodies, using torsional springs between rigid leg masses. Working Model performed so satisfactorily on the leg jack-up problem that Dr.

Smith and his colleagues have plans to use its powerful analysis capabilities to test future designs. And Noble Denton's client no longer has a fatigue crack problem that causes equipment damage and cuts into the oil profits.

Working Model, according to Dr. Read the press release ». Watch the video ». Site design by DesignHub. Jump to main nav ».