现代设计补充(Modern design supplement).doc
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现代设计补充(Modern design supplement)
Modern design supplementary information
1.CAD technology in the early 60s the famous Sketch-pad system, 70s is turnkey system (Turn-key System), in 80s, the engineering workstation and network system have great influence on the CAD, to replace the turnkey system
The main features of 2.CAD Technology: 1., mapping speed, improve work efficiency. 2., the design of unified format, high quality, and promote standardization of design, serialization, standardization. 3. improve analysis and calculation speed and solve complex design calculation. 4. easy to keep, search, modify and design technical data, shorten product design cycle. 5. design can predict the performance of the product.
3.CAD system software: operating system UNIX and MS-DOS and Mi-crosoft, computer language, network communication and management software, database and database management software dDBASE and FoxBASE. Mechanical support software CAD: basic graphics software resources, 2D and 3D drawing software AutoCAD and CADKEY and PD, geometric modeling software Design, MDT Un-graphics, Solid edge and Pro-Engineer, the analysis and calculation of software engineering, software documentation. (1) system software is the software that works directly with the hardware and plays a supporting role in other software. It mainly refers to the operating system and various computer languages. (2) support software is a general function software that supports users to work on CAD in CAD system. (3) application specific software is a software developed to meet the needs of users. Interface with support software
4. perspective projection transformation: both perspective and axonometric drawings are single sided projections. The difference is that axonometric drawings are formed by parallel projection. The perspective is formed by the central projection principle. Although both are three-dimensional map, but the perspective effect is more close to the actual effect of people with the naked
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