CAD
Computer Aided Design (Computer Aided Design) refers to the use of computer and graphics devices help designers design work.
Usually use a computer in the design of a large number of different scenarios calculated, analyzed and compared to determine the optimal solution; various design information, whether it is digital, text or graphics, can be stored in a computer's memory or external keep in, and can quickly retrieve; designers often start with a sketch design sketches into a working drawing heavy work can be handed over to the computer to complete; design results are automatically generated by a computer, you can quickly make graphics, allowing designers to timely design modifications and judgment; editing may be carried out using computer graphics, zoom processing graphic data related to work, translation, replication and rotation.
Basic Information
CAD technology as an outstanding engineering achievements, has been widely used in various fields of engineering design. Development and application of traditional CAD systems approach to product design and production pattern has undergone profound changes, resulting in a huge social and economic benefits. CAD technology research focus currently have computer aided conceptual design, computer-supported collaborative design, massive information storage, management and retrieval, research design and its related issues, support for innovation and design.
It is foreseeable technology will have a new leap forward, while also causing a design change.
CAD technology has been in constant development and exploration. Application of CAD technology plays a corporate design to improve efficiency, optimize the design, reduce labor intensity and technical personnel, shorten the design cycle, designed to strengthen the role of standardization. More and more people realize that CAD is a great productivity. CAD technology has been widely used in machinery, electronics, aerospace, chemicals, construction and other industries. Parallel design, collaborative design, intelligent design, virtual design, agile design, full life cycle design, design methodology represents the development direction of modern product design patterns. With the further development of artificial intelligence, multimedia, virtual reality, information technology, CAD technology inevitably towards integration, intelligence, the development of collaborative direction. CAD and CIMS technology companies must take a targeted e-commerce, gradual way. Starting from within the enterprise to achieve integration, intelligence and network management, e-commerce across the border with companies achieve customer-oriented in the true sense, agile supply chain within and between enterprises and suppliers
development path
CAD (Computer Aided Design, Computer Aided Design) was born in the 1960s, interactive graphics Massachusetts Institute of Technology research program proposed, because of the expensive hardware facilities, only General Motors and American Airlines Boeing the interactive mapping system using self-developed.
1970s, minicomputers costs decline, American industry began widespread use of interactive mapping system.
1980s, due to the application of PC, CAD (Computer Aided Design) is developing rapidly, there has been specializes in CAD systems development. CAD was VersaCAD is a professional production company, developed CAD software is powerful, but because of its high price, it is not widely used. At the time, Autodesk (US computer software company) is one of only a small number of staff in the company, the development of CAD system, although with limited functionality, but because it can free copy, it can be widely used in society. At the same time, because of the openness of the system, the CAD software upgrade quickly.
Designers have long started using computer calculations. Some people think (Ivan Sutherland) Ivan Sutherland in 1963, developed at MIT's Sketchpad (drawing board) was a turning point. SKETCHPAD outstanding characteristics is that it allows the designer to interact with the computer and graphically: the design can be drawn with a light pen into the computer screen on a cathode ray tube. In fact, this is the prototype of a graphical user interface, and this interface is an essential characteristic of modern CAD.
CAD is the first application in a large company automobile manufacturing, aerospace and electronics industry. As computers become cheaper, has gradually become a wide range of applications.
CAD technology through the implementation of a number of evolved from that time onwards. When beginning this area it is mainly used to produce drawings of similar drawings and hand-painted. Development of computer technology allows a computer to be applied more skillful in design activities. Today, CAD drawings and have been not just for show, it starts in the designer's expertise in a more "intelligent" part.
With the development of computer technology to enhance the performance and cheaper prices, many companies have been using three-dimensional graphics design. Conventionally, the performance of a computer because of limited drawing software can only stay in the graphic design, a lack of realism, and a perspective drawing is to break this limit, so that more materialized blueprint, rendering 3D drawing a 2D drawing can be expressed to be drawn the curved surface can more fully express the designer's intent.
Domestic CAD development
Secondary development of CAD technology products in China originated in the secondary development on the basis of foreign CAD technology platform, as Chinese enterprises to enhance the demand for CAD applications, developers have many domestic CAD technology through the development of foreign-based software platform for domestic enterprises to truly universal the CAD, and the gradual emergence of a group of truly outstanding CAD developers.
On the basis of secondary development on the part of the leading domestic CAD CAD developers have gradually explore suitable for China's development and demand patterns, CAD products more in line with domestic enterprises to use, their purpose is to develop the best CAD, even as the world to provide the best CAD technology.
2014. In addition to providing excellent CAD platform software technology outside, has been actively promoting the development of domestic CAD technology, many domestic joint CAD secondary developers composed of domestic CAD league, but greatly contributed to the development and growth of domestic CAD for Chinese companies really suitable for China's national conditions and applications of CAD solutions.
The basic technology
Including interactive technology, graphics conversion technology, surface modeling and solid modeling technology.
In computer-aided design, interactive technology is essential. Interactive CAD system, refers to the user in the use of computer system design, and the machine can exchange information in a timely manner. The use of interactive systems, it may be contemplated edge, edge proofing, modification edge, ready to see that the operation of each step from the graphic terminal screen, very intuitive.
The main function is to transform the pattern coordinate system and a graphical user coordinate system linked to the output device; graphics translational, rotational, scale, perspective transformation; achieved through graphics transformation matrix operation.
Computer Design Automation computer's own CAD, computer designed to automate the design and development process itself or semi-automated. The study includes functional design automation and assembly design automation, involves computer hardware description language, system-level simulation, automatic logic synthesis, logic simulation, micro-program design automation, automatic logic partitioning, automatic placement and routing, as well as the corresponding interactive graphics systems and engineering database system. IC CAD is sometimes included in the scope of computer design automation.
