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计算机辅助设计-CAD

The use of computer technology when undertaken for the process of design as well as well as design documentation is called computer added design or computer aided design and drafting. By suing the CADD software and environments, the user gets equipped with the input tools which are necessary for the streamlining the design processes as well as their documentation, drafting and other manufacturing processes. Electronic files for machining processes and the print form the output of CAD. CAD based software is produced in direct correlation with the processes they seek to economize. For example, the industry based software for industries like construction and manufacturing uses vector based or linear environments. In contrast, the graphic based software uses the theater based pixilated environment.

The output of CAD should have dimensions more than just shape providence. It must also be able to convey information on materials, processes, tolerances and dimensions, which must be specific to application specific conventions. CAD is used to design surfaces, solids figures and curves in both two dimensional as well as three dimensional forms of solids.

CAD在各个领域的研究背后的主要驱动力以及纪律等纪律（例如计算机图形（硬件和软件），计算几何形状和离散的差别几何形状。增加对各种活动的估计研究的使用以及增加工业艺术的使用量增加（现在已在更多的应用中更广泛地使用），CAD应用程序在工业领域的应用增加了，例如汽车，造船业，航空工业，假肢，假肢，假肢，假肢，工业和农业设计等等。CAD应用程序的一些新领域包括用于电影，技术和广告手册等特殊效果的计算机动画。

随着计算机日复一日的功能越来越强大，无处不在，即使是当今设计的香水瓶和洗发水分配器，也使用了几十年来闻所未闻的先进技术。

CAD软件包装范围从2 D基于矢量的起草系统到3D表面和实心建模器。现代的CAD软件包允许从任何所需角度查看移动对象，并以三个维度显示操作。能够动态数学建模的CAD软件是CADD。

CAD的应用和用途

1. CAD is used increasingly for drafting individual tools and machineries as well as drafting and designing of all types of buildings. The building designed could range from small residential houses to large industrial and commercial structures like factories and hospital.

2.通过使用CAD，可以对物理组件的3D和2D图进行详细的工程。它也用于工程过程和产品布局的概念设计，还可以设计对象。

4. CAD has some major benefits like lower product development costs along with lesser time involved with a greatly shortened design cycle. Through CAD, the designers can design a layout and work on screen itself. The labor/design could then be printed out and saved for future editing, as they might have been lost on their drawings.

5. CAD用于产品生命周期管理过程，作为数字产品开发过程的一部分。它与其他工具相结合，例如计算机辅助工程，计算机辅助制造，照片现实渲染，产品数据管理等。

6.CAD是我们ed for the creation of accurate photo stimulations, which are required in the preparation of environmental impact reports.

8. CAD features are used by engineers for measurement of tensile strength, stress and strain, yield strength and the effect of temperature on various elements.

Technology used in CAD

The original software of computer added design systems was developed using computer languages such as FORTRAN. But with the advancement of objects oriented programming methods, the new and modern freedom surface systems and parametric feature based modelers are used which are built around a number of key C modules. They have their own API’s. The CAD system is built from the interaction of a graphical user interface with nurbs geometry while having a boundary representation data provided through a geometric modeling kernel. The geometry constraining engine employed is used to manage the associative relationships which occur between geometry for example, for components in an assembly or in wireframe geometry. From these associative relationships new form of prototyping have been produced which are termed as digital prototyping. As of now CD systems are available for all major platforms like windows, UNIX, Linux and Mac OS X. Multiple packages are also supported by certain platforms. For the interface between human and machine, a computer mouse is used which can also be replaced by a pen and digitizing graphics tablet. The space mouse or space ball is used for doing manipulation on screen in viewing objects. Various type of CAD includes the lower 2d systems, the 3d wireframe, the 3d dumb and 3d parametric solid modeling etc.