Computer-aided modeling and finite element method are advanced CAD/CAE technologies developed with the application of computer technology. They are widely used in scientific computing, design and analysis in various fields, and successfully solved many complicated designs. And analyzing problems has become an important tool in engineering design and analysis.
The design includes the shape of a spacecraft component and the pressure forming analysis of thin-plate parts, which has practical significance in engineering. In the three-dimensional design, a tail nozzle, a rudder, and a wing are designed, wherein the tail nozzle is composed of four parts, including an inner support portion and an outer skin portion. Both the rudder and the wing are made up of more than two skin surfaces. In the finite element analysis, the elastoplastic analysis of the thin metal plate and the elastoplastic analysis of the rudder surface were carried out, and the superplastic analysis of the thin plate was also carried out.
I. Introduction
In order to meet the needs of a variety of aerospace products, small batch development and production, computer-aided design and manufacturing, to achieve parallel engineering, agile manufacturing, flexible production, has become an effective way to accelerate the development of China's aerospace manufacturing technology.
The traditional aerospace parts product design, mold design and processing are all completed according to the two-dimensional engineering drawings. The processed product data is not accurate, and the product design is constantly modified, and the mold is constantly modified. Therefore, its research and development week Long, high cost; using the latest CAD / CAE / CAM - Pro / Engineer software to achieve three-dimensional design, can greatly shorten the product development cycle, mold design cycle and processing cycle, improve the accuracy of product design, greatly reduce product development , mold design costs. Because of its powerful functions and numerous modules, users must have high operational skills and rich application experience to be proficient in modeling. For ordinary designers, using the solid modeling module provided by Pro/E for 3D modeling is not an easy task. It requires designers to spend a lot of time and effort to familiarize themselves with Pro/E modeling techniques and master certain. skill.
In a highly competitive market environment, in order to gain a competitive advantage, companies urgently need to be able to quickly develop high-quality, low-cost products and quickly seize the market. Therefore, the business community urgently needs high-tech, high-speed, low-cost design methods. With the rapid development and popularization of computer technology, the finite element method has rapidly expanded from structural engineering strength analysis and calculation to almost all fields of science and technology, becoming a colorful, widely used, practical and efficient numerical analysis method, finite element in product design. And the unparalleled superiority shown in the development, making it an important tool for enterprises to win in the market competition.
1.1 The status quo in the domestic field At present, computer-aided design (CAD) and computer-aided engineering (CAE) in China have been widely used, and most large-scale manufacturing enterprises have become quite mature. If we let us investigate the application of CAD in domestic enterprises, we will come to the following conclusions. Many enterprises that are well-known for CAD applications are only trying to change the status of manual mapping to computer graphics. Of course, there are many computer graphics. Advantages, beautiful, standardized, easy to modify, easy to archive, etc. But if we just stay at this stage, we lose the role of CAD, because CAD is an auxiliary design, not an auxiliary drawing. Since it is a design, it not only thinks about the mechanical model of the product, but also the structural analysis of the product, the analysis of the motion mechanism, and the processing and processing of the product. Only in this way can the role of CAD be truly realized. If you really do this, two-dimensional design alone is not enough. Although the traditional mapping method describes the three-dimensional entity through two-dimensional view, this description can't do further structural analysis, motion mechanism analysis and numerical control processing. It is impossible to truly automate production. What's more, the description of 2D views often has two meanings and misunderstandings, because people only imagine the three-dimensional appearance according to some regulations, and the limitations of this description method must be found. More advanced and more reasonable 3D design means that CAD, CAM, CAE and PDM are integrated. Of course, this goal has a process, but now we must be clear.
1.2 Main Contents This design includes the modeling of a spacecraft component and the pressure forming analysis of thin-plate parts, which has practical practical significance. Several methods and theories of modeling and the basic theories of finite element analysis are introduced. In the three-dimensional design, a tail nozzle, a rudder, and a wing are designed, wherein the tail nozzle is composed of four parts, including an inner support portion and an outer skin portion. Both the rudder and the wing are made up of more than two skin surfaces. In the finite element analysis, the elastoplastic analysis of the thin metal plate and the elastoplastic analysis of the rudder surface were carried out, and the superplastic analysis of the thin plate was also carried out.
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