Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8063658 | Ocean Engineering | 2018 | 20 Pages |
Abstract
An Innovative Tension Leg Platform (TLP) Optimization Program, called ITOP, has been developed to solve the multi-objective optimization problem for TLP. We first examine the hydrodynamic behavior of a base TLP for wave headings between 0â and 45â. The numerical results show that the maximum heave and surge motion responses occur in 0â wave heading in long-crest waves. It is found that the dynamic tension of No. 8 tendon is larger than the other tendons and reaches its maximum in 45â wave heading. It can be attributed to the fact that heave and pitch motions are almost out of phase for wave periods between 10 and 15Â s. Because the maximum wave elevation occurs near the northeast column and the vertical motion is very small, the minimum airgap occurs there. Moreover, a surrogate model based on radial basis function (RBF) has been built and adopted to estimate the hydrodynamic performance of TLP. A multi-objective evolutionary algorithm, Non-dominated Sorting Genetic Algorithm II (NSGAII), is employed to find the Pareto-optimal solutions. By comprehensive and systematic computations and analyses, it is revealed that the maximum dynamic tension shows positive correlation with pontoon height and width, but negative correlation with hull draft, column spacing, and column diameter. The most efficient modification strategy for design is proposed to reduce the maximum dynamic tendon tension. According to the strategy, the column spacing, draft, and column diameter should be increased in sequence. By applying this strategy, the maximum dynamic tendon tensions can be reduced while the total weight of the platform is minimized as much as possible.
Related Topics
Physical Sciences and Engineering
Engineering
Ocean Engineering
Authors
Xinshu Zhang, Xingyu Song, Wenzhen Qiu, Zhiming Yuan, Yunxiang You, Naiming Deng,