Tishitu ( AutoCad Tutorial 3D Design ) Ver 2004. Part 1-2

Computer-aided design

Computer-aided design (CAD), also known as computer-aided design and drafting (CADD), is the use of computer technology for the process of design and design-documentation. Computer Aided Drafting describes the process of
drafting with a computer. CADD software, or environments, provides the user
with input-tools for the purpose of streamlining design processes; drafting,
documentation, and manufacturing processes. CADD output is often in the form of electronic files for print or machining operations. The development of
CADD-based software is in direct correlation with the processes it seeks to
economize; industry-based software (construction, manufacturing, etc.)
typically uses vector-based (linear) environments whereas graphic-based
software utilizes raster-based (pixielated) environments.
CADD environments often involve more than just shapes. As in the manual
drafting of technical and engineering drawings, the output of CAD must convey
information, such as materials, processes, dimensions, and tolerances,
according to application-specific conventions.CAD may be used to design curves and figures in two-dimensional (2D) space; or curves, surfaces, and solids in three-dimensional (3D) objects.[1] CAD is an important industrial art extensively used in many applications, including automotive, shipbuilding, and aerospace industries, industrial and architectural design, prosthetics, and many more. CAD is also widely used to produce computer animation for special effects in movies, advertising and technical manuals. The modern ubiquity and power of computers means that even perfume bottles and shampoo dispensers are designed using techniques unheard of by engineers of the 1960s. Because of its enormous economic importance, CAD
has been a major driving force for research in computational geometry, computer graphics (both hardware and software), and discrete differential
geometry

Overview

Current computer-aided design software packages range from 2D vector-based drafting systems to 3D solid and surface modellers. Modern CAD packages can also frequently allow rotations in three dimensions, allowing viewing of a designed object from any desired angle, even from the inside looking out. Some CAD software is capable of dynamic mathematic modeling, in which case it may be marketed as CADD — computer-aided design and drafting.CAD is used in the design of tools and machinery and in the drafting and design of all types of buildings, from small residential types (houses) to the largest commercial and industrial structures (hospitals and factories).
CAD is mainly used for detailed engineering of 3D models and/or 2D drawings of physical components, but it is also used throughout the engineering process from conceptual design and layout of products, through strength and dynamic analysis of assemblies to definition of manufacturing methods of components. It can also be used to design objects.
CAD has become an especially important technology within the scope of

computer-aided technologies, with benefits such as lower product development costs and a greatly shortened design cycle. CAD enables designers to lay out and develop work on screen, print it out and save it for future editing, saving time on their drawings.


Uses

Computer-aided design is one of the many tools used by engineers and designers and is used in many ways depending on the profession of the user and the type of software in question.CAD is one part of the whole Digital Product Development (DPD) activity within the Product Lifecycle Management (PLM) process, and as such is used together with other tools, which are either integrated modules or stand-alone products, such as:Computer-aided engineering (CAE) and Finite element analysis (FEA)Computer-aided manufacturing (CAM) including instructions to Computer Numerical Control (CNC) machines Photo realistic rendering Document management and revision control using Product Data Management (PDM).CAD is also used for the accurate creation of photo simulations that are often required in the preparation of Environmental Impact Reports, in which

computer-aided designs of intended buildings are superimposed into photographs of existing environments to represent what that locale will be like were the proposed facilities allowed to be built. Potential blockage of view corridors and shadow studies are also frequently analyzed through the use of CAD..

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[aaasss6662011]

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[taruntishitu]

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[deds888]

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