Investigation of the quality of the frame surface when modeling the hull of a vessel depending on the type of frame lines in the Compass 3D CAD

The article provides a brief overview of the CAD systems used in the field of shipbuilding. The potential possibilities of using the domestic computer-aided design system COMPASS 3D in shipbuilding in the task of three-dimensional modeling of the theoretical surface of the hull are shown. The methods of modeling the surface of the ship's hull using the Compass 3D CAD in the form of a frame surface, in which the shaping sections are various types of vessel contours: frames, buttocks and lines. A method for checking the simulated frame surface using control sections is proposed. A comparative analysis of the quality of surfaces obtained by different methods of its formation has been carried out according to a number of proposed quantitative indicators characterizing the smoothness and accuracy of the surface. The influence of the introduction of intermediate sections into the frame set on the quality indicators of the frame surface is analyzed. The results of a quantitative comparative analysis of the quality of the frame surface depending on the type of frame lines are presented. It has been shown that an increase in the total number of forming lines in the frame does not necessarily lead to an increase in the quality of the simulated surface. The results of the work may be of practical interest in the tasks of modeling and evaluating the quality of frame surfaces for various purposes, set by a set of sections in various planes, and will also help in choosing an automated design system for shipbuilding enterprises.