Solving method and device for intersection lines of support line expansion method

Abstract

The invention discloses a solving method and device for intersection lines of a support line expansion method. Frustum buses are obtained from a frustum shell plate curved surface; three adjacent frustum buses are taken as a group; a top division point or a bottom division point of a first bus is taken as a first connection point, any point of a second bus is taken as a second connection point, and the top division point or the bottom division point of a third bus is taken as a third connection point; two intersection curve segments of a first arc intersection line and a second arc intersection line are solved through utilization of a three-point arc construction method; the intersection curve segments fit with the surface of a frustum shell plate; and the support line expansion work is carried out by taking the first arc intersection line and the second arc intersection line as real length values. The defect of a triangle hypotenuse unreal length value in an expansion sample is overcome, the precision of the diagonal side length of the expansion sample is ensured, and the precision of the expansion sample is improved.

Description

technical field [0001] The technical field of curved surface development of the present invention, in particular, relates to a method and device for obtaining crossing lines of the support line development method. Background technique [0002] Surface unfolding technology has always been a hot and difficult point in the field of shipbuilding. The unfolding of hull components provides a construction basis for the numbering process. The basic principle of the unfolding is to divide the non-flattenable surface into many small surfaces. These small curved surfaces can be unfolded as planes or unidirectional curved surfaces. The surface unfolding methods mainly include the support line unfolding method and the directrix unfolding method. [0003] The support line expansion method is used to divide the surface into many small triangles. It is generally used for the expansion of the shell plate with large double curvature or large three-dimensional curvature, especially for the lof...

AI Technical Summary

Problems solved by technology

However, the method of endlessly increasing the number of triangles not only consumes a lot of energy, but also a large number of triangles will inevitably cause cumulative errors, so that the accuracy of the expansion results cannot be guaranteed.

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