A Fairing Method for Asymmetric Ship Shape

Abstract

The invention discloses a smoothing method for an asymmetric ship shape and relates to the technical field of ships. The asymmetric ship in the present invention has an asymmetric stern, and the line distortion of the stern contour line includes the following steps, step 1, dividing the hull of the asymmetric ship into multiple regions; step 2, near the stern contour line The line type of the area is smoothed by the Pline line, and the line type of other areas of the asymmetric ship is smoothed by orthogonal interpolation; step 3, merge the line types of each area after smoothing; step 4, generate the asymmetric ship Whole ship Patch; Step 5, export the whole ship Surface of the asymmetric ship. The smoothing method of the asymmetric ship type proposed by the present invention can overcome the shortcomings that the conventional smoothing methods cannot be used for the asymmetric ship type, and the smoothing method of the present invention can reduce the fairing workload and shorten the fairing period.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a smoothing method for an asymmetric ship shape. Background technique [0002] Smoothing is a very important problem in CAD / CAM, and it is widely used in the shape design of aircraft, ships, automobiles and molds. For curves, the fairing criteria are as follows: second-order smooth continuity, no redundant inflection points, uniform curvature changes, no redundant variable deflection points, and uniform torsion changes. At present, the smoothing of the hull line is realized by smoothing the three groups of mutually orthogonal hull curves of X (transverse line), Y (longitudinal line) and Z (waterline). First smooth the transverse section line, then re-interpolate and smooth the longitudinal section line, and finally interpolate and smooth the waterline; after the longitudinal section line and waterline are both smoothed, update the transverse section line and continue Smoothing, a...

AI Technical Summary

Problems solved by technology

Although the above method can solve the smoothness of part of the hull line, but for asymmetric ship, for example, the stern line is asymmetrical, and the stern outline is not at the longitudinal plane, if the existing orthogonal planes are used to interpolate Due to the special reason of the line distortion transition in the stern outline area, when interpolating waterlines and longitudinal sections, Lines (one of the modules used for smoothing lines in the Tribon system) cannot arrange each Data points, the data arrangement order of each model line is disordered, and it is impossible to perform smoothing directly

Moreover, due to the asymmetrical line shape, it is impossible to smooth only the port side line shape like a symmetrical ship type. Both the port and port side line shapes of the hull must be smoothed separately, and the workload will be more than twice that of a symmetrical ship type.

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