3D CAD technology and application of the hottest c

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Garment 3D CAD technology and application

Abstract: This paper introduces the development of 3D CAD technology, focuses on the development of garment 3D CAD technology in China, and puts forward the structural framework of garment 3D CAD engineering

1. Outline of 3D CAD technology

1.1 brief analysis of the market demand of 3D CAD technology

1.1.1 general trend of international manufacturing informatization

in the current international manufacturing field, manufacturing technology is developing from traditional manufacturing methods to advanced manufacturing technology, and manufacturing informatization has become an important trend of manufacturing development

the core of digital construction of manufacturing enterprises is the digital design and manufacturing of products and the integration of related digital technologies. If the rubber fatigue testing machine can not be carried out, the three-dimensional digital design technology has gradually become a hot spot in the design and application of enterprises, and it is also a necessary tool for enterprises to deepen the application. As an important part of information technology, CAD combines the high-speed and massive data storage, processing and mining capabilities of computers with people's comprehensive analysis and creative thinking capabilities, and plays an important role in accelerating the development of engineering and products, shortening the design and manufacturing cycle, improving quality, reducing costs, and enhancing the market competitiveness and innovation ability of enterprises. Whether it is military industry or civil industry, whether it is construction industry or manufacturing and processing industry, whether it is machinery, electronics, light textile products, or literary and sports, film and television advertising production are inseparable from three-dimensional digital design technology. Three dimensional digital design technology is an important technical basis for enterprise informatization, and it is also an admission ticket for enterprises to enter the international market

1.1.2 great benefits of 3D CAD technology

the application of 3D CAD technology can greatly improve the design efficiency and quality of products and projects, improve working conditions, and improve the competitiveness of products and projects in the market. Statistics from foreign countries show that the application of 3D CAD design technology can reduce the engineering design cost by 13 ~ 30%; It can reduce the time from product design to production by 30 ~ 60%; Improve product quality by 5 ~ 15 times; Increase the breadth and depth of problem analysis by 3 ~ 35 times; Increase the productivity of product operation by 40 ~ 70%; increase the productivity of input equipment by 2 ~ 3 times; Reduce the processing process by 30 ~ 60%; Reduce labor cost by 5 ~ 20%. With the research, development and wide application of 3D digital design technology, it can promote the development of China's software industry, especially the development of application software industry. This will not only accelerate the technological transformation of traditional industries and products, but also promote the rapid development of traditional disciplines. The resulting direct and indirect economic benefits are huge, and its social benefits are immeasurable

1.1.3 new opportunities for the development of 3D CAD technology in China

in China, the 3D digital design market is almost monopolized by the products of foreign companies. Some enterprises spend a lot of foreign exchange to introduce foreign 3D digital design systems. Due to many factors such as the mastery of technology and the gap between industrial standards, they are either idle or inefficient, which is difficult to popularize and apply. Under the new situation of respecting intellectual property rights and joining the WTO, domestic enterprises are increasingly calling for domestic software that conforms to national conditions, has applicable functions and moderate prices

in recent years, the development of related technology fields with computer as the core, such as network technology, e-commerce, database, etc., has profoundly affected CAD technology. New manufacturing methods, such as decentralized network manufacturing, customer-oriented mass customization, etc., have also put forward new requirements for CAD systems, making the design and manufacturing resources of industrial products can be applied in a wider range. Through web technology and ASP technology, It realizes the coordination of product design and manufacturing in the industry, and establishes the software service system of the whole industry. In addition, due to the personalization of industry-oriented CAD system, the competitiveness of foreign technology is relatively weak, which is a good opportunity to shorten the gap in China's CAD field. With the leap forward development of digitalization, networking and integration of enterprise products in the whole life cycle, CAD itself will also face a comprehensive upgrade. Therefore, China's CAD software technology has a lot of room for development

1.2 overview of the development of 3D CAD technology in China

1.2.1 the rapid development of CAD technology in China

cad technology has a history of more than 30 years since its birth. It has gone through important development stages such as two-dimensional drawing, wireframe modeling, surface modeling, solid modeling, feature modeling, which is also accompanied by the integration of parameterization, variability, size driving and other technologies. Through more than 30 years of efforts, CAD technology has become more and more mature in the basic theory and software industry. Many excellent CAD systems have been launched, such as profingineer, ugll, ideas CATM, Solidworks, solidedse and so on. They have been widely used in aerospace, machinery and electronics, construction engineering, textile and clothing and other manufacturing industries, greatly improving the product design level of manufacturing industry

1.2.2 overview of major national 3D CAD projects

according to the national needs and the trend of software technology/industrial development, the research, development and application of 3D CAD technology and product innovative design system are listed as major software projects of the 863 plan. Special research is carried out on operating systems, database management systems and major application software, and efforts are made to master strategic, cutting-edge and forward-looking key technologies related to system software. Through innovation, the ownership of independent intellectual property rights is greatly increased, and China's independent software system is improved, so as to support the construction of national economy, social informatization and national information security

During the Tenth Five Year Plan period, the three-dimensional digital design system for Industry and design process has received widespread attention. The application practice has proved that its design efficiency and intelligence are unmatched by general CAD software. The three topics of the "863 Program" 3D CAD major project have made great progress and great comprehensive benefits, and have basically reached the commercialization level

2. With the development of computer technology and social economy in China, people have higher and higher requirements for the quality, fitness and personalization of clothing. The existing two-dimensional clothing CAD technology can no longer meet the CAD application requirements of the textile and clothing industry. Clothing CAD urgently needs to develop from the current graphic design to three-dimensional three-dimensional design. Therefore, in recent years, theoretical research and practical applications have been carried out in 3D garment CAD and virtual reality garment design at home and abroad

according to Autodesk's statistics on the overall application of CAD, about 30% of the users worldwide use 3D CAD for product design, and the remaining 70% still use 2D CAD for design. In fact, three-dimensional CAD has been widely used in the world, but in the field of clothing, the development and application of three-dimensional CAD lags behind. This is because clothing, unlike solid-state products in the mechanical and electronic industries, its texture is flexible and will change with different external conditions. Therefore, it is very difficult to simulate. In particular, in order to realize the transformation from two-dimensional to three-dimensional, clothing CAD needs to solve the problems of fabric texture and dynamic performance, three-dimensional reconstruction Realistic and flexible surface modeling and other technical problems, as well as the technical problem of generating two-dimensional flat clothing pieces from three-dimensional clothing design models. These problems lead to a long development cycle and great technical difficulty of 3D garment CAD

clothing 3D CAD is different from 2D CAD in that it is an interactive 3D 3D design of the model based on the human body data model established through 3D anthropometry, and then generates 2D clothing samples. It mainly solves the establishment and local modification of the human body 3D size model, 3D clothing prototype design, 3D clothing coverage and shading 3D clothing effect display, especially dynamic display and reversible conversion between 3D clothing and 2D clothing pieces

3D clothing CAD is based on 3D anthropometry. At present, the three-dimensional human body measurement system has been commercialized in foreign countries, and its technology has been relatively mature. France, the United States, Japan and other countries can complete the measurement of three-dimensional human body data by using the principle of natural light grating in 40 milliseconds, 10 seconds and 1.8 seconds respectively. The commonly used three-dimensional anthropometry technology in the world is generally non-contact. The image formed by the light projected onto the human body surface is captured by photosensitive equipment, and then the three-dimensional characteristics of the human body are described by computer image processing. The three-dimensional anthropometric system has measurement time 14 The load displacement curve, load, time curve, displacement, time curve, stress and strain curve are short, and the amount of data obtained is large, which are superior to the traditional measurement technology

the clothing size based on the mass production of clothing can not accurately reflect the body characteristics of people. At present, the establishment of human body databases of all kinds of people is being carried out at home and abroad. Through three-dimensional anthropometry on a large number of people with different skin colors, different regions, different ages and different heights, collect various body size data of the human body, and establish a database to provide basic data for formulating clothing specifications and sizes

three dimensional anthropometry generates a virtual three-dimensional human body by acquiring the key geometric parameter data of the human body, establishes a static and dynamic human model, and forms a complete set of systems with the functions of virtual human body display and dynamic simulation. On this basis, 3D clothing CAD generates the three-dimensional effect of clothing fabrics, realistically displays the three-dimensional color image of the wearing effect on the screen, and approximately expands the three-dimensional design into plane clothing pieces

3D design based on 2D CAD is gradually developing towards intellectualization, physical property analysis and dynamic simulation, while parametric design is developing towards variable quantification and hypervariability; 3D wireframe modeling, surface modeling and solid modeling are developing towards feature modeling and semantic feature modeling; The research and application of component development technology also provides the foundation for the openness of CAD system and the realization of free assembly of functions

transforming 3D garment design model to generate 2D planar garment pieces involves the technology of expanding complex spatial surfaces into planes, which is not only the requirement determined by the flexibility and flatness of garment materials, but also the difficulty of 3D garment CAD. Scholars at home and abroad have done a number of research work and obtained a variety of methods for complex surface expansion, and many methods have also been applied in practice

2.2 application status of 3D garment CAD

at present, the application of 3D garment CAD in foreign markets mainly falls into two categories:

first, it is used for customization: for the measurement of human body parameters of specific customers and their specific requirements for garment styles (such as relaxation, length, width and other preferences), carry out garment design, and regenerate into corresponding plane garment samples. Such products can be remotely controlled through interconnection, among which the systems of the United States, Britain, France, Germany, Japan and Switzerland are more advanced

second, it is used to simulate the fitting system: through the three-dimensional measurement of customers' body shape, interactive clothing design is carried out, and the corresponding plane clothing samples are regenerated. This kind of application can also be realized by remote control of e-commerce through Internet. For example, land'send company in the United States can establish a virtual human model of customers on the Internet. Through simple operations of customers, they can try on the clothes launched by the company, and also carry out three-dimensional interactive design until customers are satisfied

at present, some foreign products can basically realize three-dimensional clothing wearing, matching design and modification, reflect the animation effect of clothing wearing comfort, simulate the three-dimensional suspension effect of different fabrics, and realize 360 degree rotation and other functions. among1734 ib8
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