Application of the hottest catiav5 in hull structu

2022-07-31
  • Detail

The application of CATIA V5 in hull structure design

I. Introduction

catia V5 is a true 3D cad/cam design system launched by Dassault systems. It has become an important design software in the aviation industry and automobile industry, and is also gradually applied in the shipbuilding industry. At present, the software launched by the company has been able to integrate ship design, manufacturing processing and information management, forming an application software integrating engineering design, processing technology and management

over the past few years, Guangzhou Wenchong Shipyard Co., Ltd. (hereinafter referred to as "Wenchong Shipyard") has improved its current capacity of bar making from the annual capacity of bar making through the conversion of shipbuilding model and continuous learning of advanced shipbuilding technology, from the original type I ship design to the current type III ship design; The application of CATIA V5 in ship design has also been significantly improved. From the end of 2005 to June 2006, through the implementation of the project and the active support of technical personnel of Dassault company, the application of CATIA V5 in hull structure design has made a new breakthrough, forming a relatively complete idea of using CATIA V5 in hull structure production design. The following mainly introduces the application of CATIA V5 in hull structure design of our company

II. Application

1. Items and requirements: CATIA V5 is used for the 3D design of the whole 1700TEU (gws334) ship hull structure. For several typical sections, it is required to be able to directly extract the required 2D production design drawings, 2D blanking parts drawings and parts reports from the 3D model, breaking through the manual AutoCAD drawing and manual input of parts lists. The length, width and height of this section are 11.6m, 3.8m and 12.7m respectively, including 490 parts in total (excluding the number of complementary plates)

2. Design idea

3. Profile fairing and data processing: at present, the Wenchuan company adopts the hd-shm hull line fairing system of Dongxin software company. After fairing, data files are generated. In order to reduce the amount of data input, the data files are processed before importing data, deleting redundant data in the same plane, but leaving flat edge points and sorting the data, as shown in Figure 1

4. Hull surface modeling:

hull surface modeling can be divided into three steps:

1> import data and generate points in the GSD working environment, as shown in Figure 2

2> connecting line, including rib line and water line, can be selectively connected as required, as shown in Figure 3

3> generate surfaces by lines, as shown in Figure 4

the first two steps can be completed by program, as shown in Figure 2. In addition, you can also directly open the two-dimensional drawing files (*.dwg) of AutoCAD2000, and then use copy and paste to generate the required rib lines and waterlines in CATIA V5, and finally connect them to form a surface. In this way, the surface generation efficiency is relatively high. The application of surface design by Wenchuan is quite successful. In addition to the hull surface modeling, it has been successfully applied to the auxiliary design of propeller and anchor test, as shown in Fig. 5 and Fig. 6

5. Building a warehouse: as a ship has tens of thousands of structural parts, of which there are many identical and similar parts or features, in order to reduce repeated work, before carrying out the 3D design of a new ship project, we will make statistics on the structure of the whole ship, plan the contents of building a warehouse, and build the basic warehouse. This is a very important link, which directly affects the quality and efficiency of subsequent 3D structure design. It can be said that CATIA V5 provides a good library building function. The establishment and application of profile, opening, material and 2D marking template database are relatively easy. The operation process of elbow plate database, profile end form and profile through-hole database is relatively complex, but the idea is still clear and simple. The following is the parameterized database establishment process of elbow plate, as shown in Figure 7. The shipbuilding company attaches great importance to the elbow plate database establishment, mainly because the number of elbow plates of a ship is very large. After efforts, we have built a database on the elbow plate, There is a clear method to build the library, including the end node Library of profile and the through hole library of profile

Figure 7. Process of elbow plate database building

6. 3D design of hull structure: CATIA V5 mainly includes three hull structure design modules SFD, SDD and Sr1. Our company mainly uses SFD and SDD modules for 3D design of hull structure. Basically, all hull structure parts can be built by using these two modules. In SFD, we build some overall structures, such as decks, bulkheads, longitudinals, frames, side longitudinals, and bones, In SDD module, small components such as elbow plate, profile through-hole and patch plate are built. After all components are built, it is transferred to Sr1 module for the last time. In this process, you can choose to automatically remove the interference part of the plate to generate the correct part shape. This design process can be shown in Figure 10

Figure 10 3D design flow chart of hull structure

if the ship is large, considering the large amount of model data, it is best to divide the ship into several parts, such as stern, bow and midship, which is conducive to accelerating the calculation speed during modeling operation. At present, the application of the three modules is relatively mature, as shown in Figure 11 and Figure 12

7. Generate 2D structure drawings and part reports: CATIA v5r17 has greatly improved the generation of 2D drawings from 3D models. From 3D to 2D, 2D drawings with automatic annotation can be generated. After the 3D model is modified, the corresponding can be updated. In addition, the drafting function of its 2D working platform is very powerful, and the drawing and annotation operations are very convenient. At present, our company produces 2D drawings from SDD (as shown in Figure 14) and parts reports from SDD, which can be conveniently saved as Excel files, as shown in Figure 15

the steps for drawing a 2D structure diagram are shown in Figure 13 below. In the first step, you can customize the line color, line thickness, font, word size, drawing background color, dimension, font, opening centerline, etc. in the drawing. For part coding, you can change the part name; The second step is plotting (as shown in Figure 14). Different plotting methods can be selected according to different situations. For example, for plotting a transverse bulkhead, you can choose to derive and reproduce. Selecting a transverse bulkhead at the body level in the directory tree can generate a correct transverse bulkhead diagram; For the section without solid ribbed plate, the third drawing method can be selected, i.e. a projection drawing and a clipping box can be added to reduce the selection range, or the fourth drawing method can be used to draw the section; The third step is labeling. You can automatically label the name and specification of Part 1 that will not affect the experiment through GVS settings, and then manually adjust the position. You can also label semi automatically through the template library

8. Regularly check whether there is oil leakage at the main engine and oil source for parts: the parts drawing is realized in the SMP module, as shown in Figure 16 and Figure 17. This module has powerful functions. It can not only produce the part drawings of straight plates and profiles needed by the development of digital economy and biological economy, but also produce the part drawings of curved plates and profiles; You can add part compensation amount and groove information, and generate processing information and jig frame information of plates and profiles. After the part drawing is generated, the part is transferred to the special nesting system for nesting and the cutting instruction is generated

conclusion

catia V5 hull structure 3D design module has a basic idea that is consistent with the actual production and design needs of the shipbuilding industry, from the whole to the part, from 3D to 2D, and can generate information reports to integrate design, manufacturing, processing and management. In the past two years, we also feel that Dassault has accelerated the progress of software development. From the R13 version that has just been used to the current R17 version, the hull structure module has been greatly improved. Wenchuan has made substantial progress in 3D and 2D drawing of CATIA V5 structure module, and the modeling operation has also been greatly improved, especially the elbow plate. However, we hope that the hull structure module will be more perfect, such as adding linear fairing, and calculating strength, stress and hydrostatic force based on 3D model. We are looking forward to this day. (end)

Copyright © 2011 JIN SHI