Fairing method for asymmetric ship type

Abstract

The invention discloses a fairing method for an asymmetric ship type and relates to the technical field of ships. The asymmetric ship type has an asymmetric stern, and the line style of a stern contour line is twisted. The fairing method comprises the following steps that firstly, an asymmetric ship body is divided to multiple areas; secondly, the line style of the area close to the stern contour line is faired through Pline, and the line style of other areas of the asymmetric ship is faired through quadrature interpolation; thirdly, the line styles of all areas are merged after fairing; fourthly, the overall ship Patch of the asymmetric ship is generated; fifthly, the overall ship Surface of the asymmetric ship is guided out. The fairing method for the asymmetric ship type can overcome the defect that a prior fairing method can not be applied to asymmetric ship types, can reduce fairing workload, and shortens the fairing cycle.

Description

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

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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