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Indexed by:会议论文

Date of Publication:2015-06-21

Included Journals:EI、Scopus

Volume:2015-January

Page Number:1245-1252

Abstract:A new Parametric Mesh Transformation Method (PMTM), which is used for structure shape optimization of the hull, is proposed in this paper. The purpose of PMTM is to realize dimension-driven of the FEM model for hull structure, without calling mesh generator as the traditional parametric method doing. In this method, the plate is split into quadrilaterals with the concept of N-Sided region modeling technology. Then create a Coons surface that interpolates four edges for each quadrilateral. Get the dimensionless parameters for all nodes of the mesh within each Coons patch by surface reverse calculation method. A combined reverse calculation method, which takes into account of both efficiency and generality, is developed and used in calculation of dimensionless parameters. When the structure is changed, all the Coon surfaces are changed accordingly. Then substitute the dimensionless parameters of each node into the surface equations of the corresponding Coons surface, and a new point is obtained. The new created point is the new location of the node. Calculate new location for each node with the above procedure, and the new finite element model according to the new structure is obtained. This method is applied to the shape optimization of a 300 ft. jack-up rig compared with the traditional method. The result shows that PMTM is able to realize dimension-driven of FEM model. It is also proved that when the parameters of the parametric structure model changed gradually, the structure stresses change smoothly with PMTM. That is an important advantage which the tradition methods do not have, and it could improve the efficiency as well as quality of hull structure shape optimization. Copyright ? 2015 by the International Society of Offshore and Polar Engineers (ISOPE).