A Lofting Method of Molded Line of Stern Containing Shaft Wrapping Plate

Abstract

The present invention relates to the technical field of lofting and smoothing of hull moldings, and discloses a method for lofting the moldings of the stern including shaft cladding plates. The molding and smoothing of the main hull of the stern is carried out separately, and then obtained after lofting. Based on the shape line diagram of the stern rib, draw the theoretical axle cladding line, and add auxiliary lines and tangent lines according to the curve characteristics of the axle cladding, smooth the space curve controlling the shape characteristics of the axle cladding in advance, and determine the shape of the axle cladding. After the basic outline of the board is smoothed, the internal rib type is smoothed. This method of staking out the stern profile line with the shaft cladding plate not only ensures the precision of the lofting, but also reduces the difficulty of the lofting work, improves the efficiency of the lofting work, and provides the basic conditions for the follow-up shaft cladding plate lofting and modeling work.

Description

technical field [0001] The invention relates to the technical field of lofting and smoothing of ship hull moldings, in particular to a method for lofting moldings of a stern including a shaft cladding plate. Background technique [0002] The hull shape line is the theoretical hull curve obtained by the upstream design unit based on the experimental design of the mother ship and the ship model pool. The shape line obtained at this stage focuses on meeting the needs of the overall performance calculation, so there will be local uneven areas , if the hull is built according to this type of line, it will cause the hull plate to be uneven and unsightly, and it will lead to an increase in the navigation resistance of the underwater part. Therefore, before the shipyard designs and builds a ship, the first step is to perform three-way smoothing on the hull shape line provided by the design institute, and obtain the smooth shape line diagram and shape line data, which will be used fo...

AI Technical Summary

Problems solved by technology

Conventional stern moldings have small curvature and smooth transition of curve changes, while shaft cladding area moldings have large curvature and rapid curve changes. For example, the shaft cladding moldings and stern moldings are taken as a whole and three-way smooth lofting is carried out at the same time , not only will increase the workload of stakeout, but at the same time, the molded line in the shaft cladding area will interfere with the normal trend of the stern molded line, making it difficult to achieve a satisfactory smoothing effect for the stern molded line

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