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Example: 3D CAD model Computer-aided design ( CAD) is the use of (or ) to aid in the creation, modification, analysis, or optimization of a. CAD software is used to increase the productivity of the designer, improve the quality of design, improve communications through documentation, and to create a database for manufacturing. CAD output is often in the form of electronic files for print, machining, or other manufacturing operations. The term CADD (for Computer Aided Design and Drafting) is also used.

Its use in designing electronic systems is known as ( EDA). In it is known as ( MDA) or computer-aided drafting ( CAD), which includes the process of creating a with the use of. CAD software for mechanical design uses either vector-based graphics to depict the objects of traditional drafting, or may also produce showing the overall appearance of designed objects. However, it involves more than just shapes. As in the manual of and, the output of CAD must convey information, such as, and, according to application-specific conventions.

CAD may be used to design curves and figures in (2D) space; or curves, surfaces, and solids in (3D) space. CAD is an important extensively used in many applications, including, and industries, industrial and, and many more. CAD is also widely used to produce for in movies, and technical manuals, often called DCC. 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, (both hardware and software),.

The design of for object shapes, in particular, is occasionally called computer-aided geometric design ( CAGD). Contents. Overview of CAD software Starting around the mid 1960s, with the IBM Drafting System, computer-aided design systems began to provide more capability than just an ability to reproduce manual drafting with electronic drafting, the cost-benefit for companies to switch to CAD became apparent. The benefits of CAD systems over manual drafting are the capabilities one often takes for granted from computer systems today; automated generation of, auto layout in, interference checking, and many others. Eventually, CAD provided the designer with the ability to perform engineering calculations. During this transition, calculations were still performed either by hand or by those individuals who could run computer programs. CAD was a revolutionary change in the engineering industry, where draftsmen, designers and engineering roles begin to merge.

It did not eliminate departments, as much as it merged departments and empowered draftsman, designers and engineers. CAD is an example of the pervasive effect computers were beginning to have on industry.

Current computer-aided design software packages range from 2D -based drafting systems to 3D and modelers. 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 mathematical modeling. CAD technology 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 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 such as jewelry, furniture, appliances, etc.

Furthermore, many CAD applications now offer advanced rendering and animation capabilities so engineers can better visualize their product designs. Is a type of virtual construction engineering simulation incorporating time or schedule related information for project management. CAD has become an especially important technology within the scope of, with benefits such as lower product development costs and a greatly shortened. CAD enables designers to layout 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 (PLM) processes, and as such is used together with other tools, which are either integrated modules or stand-alone products, such as:. (CAE) and (FEA). (CAM) including instructions to (CNC) machines. and Motion Simulation. Document management and using (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, where the proposed facilities are allowed to be built. Potential blockage of view corridors and shadow studies are also frequently analyzed through the use of CAD.

CAD has been proven to be useful to engineers as well. Using four properties which are history, features, parameterization, and high-level constraints. The construction history can be used to look back into the model's personal features and work on the single area rather than the whole model. Parameters and constraints can be used to determine the size, shape, and other properties of the different modeling elements.

The features in the CAD system can be used for the variety of tools for measurement such as tensile strength, yield strength, electrical or electromagnetic properties. Also its stress, strain, or how the element gets affected in certain temperatures, etc. See also: There are several different types of CAD, each requiring the operator to think differently about how to use them and design their virtual components in a different manner for each.

There are many producers of the lower-end 2D systems, including a number of free and open-source programs. These provide an approach to the drawing process without all the fuss over scale and placement on the drawing sheet that accompanied hand drafting since these can be adjusted as required during the creation of the final draft. 3D is basically an extension of 2D drafting (not often used today).

Each line has to be manually inserted into the drawing. The final product has no mass properties associated with it and cannot have features directly added to it, such as holes. The operator approaches these in a similar fashion to the 2D systems, although many 3D systems allow using the wireframe model to make the final engineering drawing views. 3D 'dumb' solids are created in a way analogous to manipulations of real-world objects (not often used today). Basic three-dimensional geometric forms (prisms, cylinders, spheres, and so on) have solid volumes added or subtracted from them as if assembling or cutting real-world objects. Two-dimensional projected views can easily be generated from the models.

Basic 3D solids don't usually include tools to easily allow motion of components, set limits to their motion, or identify interference between components. There are two types of. Parametric modeling allows the operator to use what is referred to as 'design intent'. The objects and features created are modifiable. Any future modifications can be made by changing how the original part was created.

If a feature was intended to be located from the center of the part, the operator should locate it from the center of the model. The feature could be located using any geometric object already available in the part, but this random placement would defeat the design intent. If the operator designs the part as it functions the parametric modeler is able to make changes to the part while maintaining geometric and functional relationships. provide the ability to edit geometry without a history tree. With direct modeling, once a sketch is used to create geometry the sketch is incorporated into the new geometry and the designer just modifies the geometry without needing the original sketch. As with parametric modeling, has the ability to include relationships between selected geometry (e.g., tangency, concentricity).

Top end systems offer the capabilities to incorporate more organic, aesthetics and ergonomic features into designs. Is often combined with solids to allow the designer to create products that fit the human form and visual requirements as well as they interface with the machine. Technology. A CAD model of a.

Originally software for Computer-Aided Design systems was developed with computer languages such as, but with the advancement of methods this has radically changed. Typical modern and systems are built around a number of key modules with their own. A CAD system can be seen as built up from the interaction of a (GUI) with geometry or (B-rep) data via a. A geometry constraint engine may also be employed to manage the associative relationships between geometry, such as wireframe geometry in a sketch or components in an assembly. Unexpected capabilities of these associative relationships have led to a new form of called. In contrast to physical prototypes, which entail manufacturing time in the design. That said, CAD models can be generated by a computer after the physical prototype has been scanned using an machine.

Depending on the nature of the business, digital or physical prototypes can be initially chosen according to specific needs. Today, CAD systems exist for all the major platforms (, and ); some packages support multiple platforms. Right now, no special hardware is required for most CAD software. However, some CAD systems can do graphically and computationally intensive tasks, so a modern, high speed (and possibly multiple) and large amounts of may be recommended. The human-machine interface is generally via a but can also be via a pen and digitizing. Manipulation of the view of the model on the screen is also sometimes done with the use of a. Some systems also support stereoscopic glasses for.Technologies which in the past were limited to larger installations or specialist applications have become available to a wide group of users.

These include the or and interactive like motion-sensing Software CAD software enables engineers and architects to design, inspect and manage engineering projects within an integrated (GUI) on a system. Most applications support with (B-Rep) and geometry, and enable the same to be published in a variety of formats. A is a software component that provides solid modeling and surface modeling features to CAD applications.

Based on market statistics, from Autodesk, Dassault Systems, Siemens PLM Software, and PTC dominate the CAD industry. The following is a list of major CAD applications, grouped by usage statistics. Commercial. Autodesk. MicroStation. Bricsys. Dassault Systemes.

Dassault Systemes. Electra. Kubotek. Siemens. PTC (formerly known as Pro/ENGINEER).

Trimble. AgiliCity.

Vectorworks. Freeware and open source. CAD kernels. by Siemens.

by Spatial. by Autodesk. by C3D Labs History Designers have long used computers for their calculations. Were used in power system analysis or optimization as early as proto-' in. Circuit theory, or methodology would be, and often -based. Examples of problems being solved in the mid-1940s to 50s include: servo motors controlled by generated pulse (1949), a digital computer with built-in computer operations to automatically co-ordinate transforms to compute radar related vectors (1951) and the essentially graphic mathematical process of forming a shape with a digital machine tool (1952).

These were accomplished with the use of computer software. The man credited with coining the term CAD, stated, 'As soon as I saw the interactive display equipment,' being used by radar operators 1953 he saw it would be just what his SAGE related data reduction group needed. With the Lincoln Lab people, they were the only ones who used the big, complex display systems put in for the pre-SAGE, Cape Cod system.

But 'we used it for our own personal workstation.' The designers of these very early computers built utility programs so that programmers could debug programs using flowcharts on a display scope with logical switches that could be opened and closed during the debugging session. They found that they could create electronic symbols and geometric figures to be used to create simple circuit diagrams and flowcharts. And that an object once drawn could be reproduced at will, its orientation, Linkage or scale changed. This suggested numerous possibilities to them. It took ten years of interdisciplinary development work before SKETCHPAD sitting on evolving math libraries emerged from MIT's labs.

Additional developments were carried out in the 1960s within the aircraft, automotive, industrial control and electronics industries in the area of 3D surface construction, NC programming, and design analysis, most of it independent of one another and often not publicly published until much later. Some of the mathematical description work on curves was developed in the early 1940s by Robert Issac Newton from Pawtucket, Rhode Island. In his 1957 novel The Door into Summer suggested the possibility of a robotic Drafting Dan.

However, probably the most important work on polynomial curves and sculptured surface was done by, , (, ), James Ferguson , , Birkhoff (GM) and Garibedian (GM) in the 1960s and W. Gordon (GM) and R. Riesenfeld in the 1970s. The invention of the 3D CAD/CAM is attributed to a French engineer, (, Renault). After his mathematical work concerning surfaces, he developed, between 1966 and 1968, to ease the design of parts and tools for the automotive industry. Then, UNISURF became the working base for the following generations of CAD software.

It is argued that a turning point was the development of the system at by (who later created a graphics technology company with David Evans). The distinctive feature of SKETCHPAD was that it allowed the designer to interact with his computer graphically: the design can be fed into the computer by drawing on a with a. Effectively, it was a prototype of, an indispensable feature of modern CAD. Sutherland presented his paper Sketchpad: A Man-Machine Graphical Communication System in 1963 at a having worked on it as his PhD thesis paper with Doctoral advisor Claude Shannon. Quoting, 'For drawings where motion of the drawing or analysis of a drawn problem is of value to the user, Sketchpad excels. For highly repetitive drawings or drawings where accuracy is required, Sketchpad is sufficiently faster than conventional techniques to be worthwhile.

For drawings which merely communicate with shops, it is probably better to use conventional paper and pencil.' Over time efforts would be directed toward the goal of having the not just with shops but with the itself. This goal would be a long time arriving. The first commercial applications of CAD were in large companies in the automotive and aerospace industries, as well as in electronics.

Only large corporations could afford the computers capable of performing the calculations. Notable company projects were, a joint project of and (, Doug Ross's APT research assistant) to develop a prototype system for design engineers (Design Augmented by Computer) 1964; projects; GRAPHIC 1. One of the most influential events in the development of CAD was the founding of MCS (Manufacturing and Consulting Services Inc.) in 1971 by Patrick J. Hanratty, who wrote the system ADAM (Automated Drafting And Machining) but more importantly supplied code to companies such as , ,.

As computers became more affordable, the application areas have gradually expanded. The development of CAD software for personal desktop computers was the impetus for almost universal application in all areas of construction. Other key points in the 1960s and 1970s would be the foundation of CAD systems, Intergraph IGDS in 1974 (which led to in 1984).

CAD implementations have evolved dramatically since then. Initially, with 3D in the 1970s, it was typically limited to producing drawings similar to hand-drafted drawings. Advances in programming and computer hardware, notably solid modeling in the 1980s have allowed more versatile applications of computers in design activities. Key products for 1981 were the solid modeling packages - (ShapeData) and Uni-Solid (Unigraphics) based on PADL-2 and the release of the surface modeler. Autodesk was founded 1982 by John Walker, which led to the 2D system. The next milestone was the release of in 1987, which heralded greater usage of feature-based modeling methods and parametric linking of the parameters of features.

Also of importance to the development of CAD was the development of the B-rep solid modeling kernels (engines for manipulating geometrically and topologically consistent 3D objects) (ShapeData) and (Spatial Technology Inc.) at the end of the 1980s and beginning of the 1990s, both inspired by the work of Ian Braid. This led to the release of mid-range packages such as and TriSpective (later known as ) in 1995, (then ) in 1996 and in 1999. An independent has been evolving in Russia since the 1990s. See also. Narayan, K. Lalit (2008). New Delhi: Prentice Hall of India.

Narayan, K. Lalit (2008).

New Delhi: Prentice Hall of India. Duggal, Vijay (2000). Cadd Primer: A General Guide to Computer Aided Design and Drafting-Cadd, CAD. Mailmax Pub. Madsen, David A. Clifton Park, NY: Delmar. Farin, Gerald; Hoschek, Josef; Kim, Myung-Soo (2002).

Pottmann, H.; Brell-Cokcan, S. And Wallner, J. (2007) 2009-08-12 at the., pp. 213–234 in Curve and Surface Design, Patrick Chenin, Tom Lyche and Larry L. Schumaker (eds.), Nashboro Press,. Farin, Gerald (2002), Morgan-Kaufmann,.

Jennifer Herron (2010)., CAEWatch, September 12, 2011. van Kooten, Michel (2011-08-23). Software Top 100., BeyondMech. Software, Radica. Pillers, Michelle (March 1998). Cadence Magazine.

Archived from on 2007-04-22. Bozdoc, Marian (2003). Carlson, Wayne (2003). Ohio State University. Archived from on 2004-07-05. illustrated symbolic diagram.

Susskind, Alfred K.; McDonough, James O. (March 1953). Review of Input and Output Equipment Used in Computing Systems.

New York City:. Retrieved 2015-02-24. Ross, Douglas T. (17 March 1961). MIT USAF 8436-TM-4. 39–73 in SIGGRAPH 89 Panel Proceedings, ACM New York, NY, USA,:.

Lincoln Writer, Scopewriter pp. 3–17 Weisberg, David E. Yares, Evan (February 13, 2013). DesignWorld. (PDF).

Lincoln Laboratory Journal. Archived from (PDF) on 2012-11-07. Archived from on 2005-02-09. Akeley, Kurt (1981) 2014-10-19 at the. Eurographics Digital Laboratory, diglib.eg.org. Archive.org. Yares, Evan (April 2013).

Design World. WTWH Media, LLC. External links.

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