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Dynamic analysis of a tension leg platform for offshore wind turbines

Wang H-F., Fan Y-H., Liu Y

Journal of Power Technologies

2014

Vol. 94, nr 1

42--49

The design for floating offshore wind turbine tension leg platform (FOWT-TLP) is economic, feasible and less platform motion comparing other floating structure, especially in deep water. In this paper, introducing spar floating structure advantage into tension leg platform to propose a conceptualization floating offshore wind turbine tension leg platform (HIT-FOWT-TLP). Concrete ballast model is arranged in the bottom of the spoke bottom plane to be as permanent ballast and much water ballast can be considered in single column, which can adjust gravity center by water freely to obtain dynamic feature that we needs and easy to assemble comparing other concepts; spoke part are considered in dimension and mass. The new model is only 49% of NREL-TLP model’s displacement, in mass it is only 27% of NREL-TLP model. We compare the hydrodynamic characteristic parameters and the RAO value in same environmental situation with NREL-TLP model. The result shows that in roll, sway and pitch motion, the new model has better performance.

A Refined VQ-Based Image Compression Method

Chan Y-K, Wang H-F., Lee C-F.

Fundamenta Informaticae

2004

Vol. 61, nr 3,4

213-221

This paper presents a refined VQ-based image compression method which modifies the traditional VQ-based image compression method. The refined VQ-based image compression method further lossless encodes the compression data which is generated by the traditional VQ-based image compression method into a set of compression codes. The index image generated by the refined method is a contracted image of the compressed image, which can be used as the preview of the compressed image on image management. Although the PSNRs of the reconstructed images that are decoded by the refined VQ-based image compression method and the traditional VQ-based image compression method are the same, the refined VQ-based image compression method provides a better storage efficiency.