Computer Aided Design (CAD) overview

The aim of CAD is to apply computers to both the modeling and communication of designs. There have been two different approaches – which are often used together – namely:at a basic level, to use computers to automate or assist in such tasks as the production of drawings or diagrams and the generation of lists of parts in a design;at a more advanced level, to provide new techniques which give the designer enhanced facilities to assist in the design process.

The bulk of the development in CAD (computer aided design) has been in modeling the form of products (i.e. in providing techniques to assist in the representation of form using conventional drawings or new modeling techniques) or in systems to assist in the production of diagrams and the subsequent evaluation of designs represented by these diagrams.

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The driving force behind the provision of computer assistance for conventional modeling techniques has been the desire to improve the productivity of the designer by the automation of the more repetitive and tedious aspects of design, and also to improve the precision of the design models. New techniques have been developed in an attempt to overcome perceived limitations in conventional practice – particularly in dealing with complexity – for example in the complexity of form of some designs such as automobile bodies, or the intricacy of structure of products such as integrated circuits. Computer-aided design should therefore enable the designer to tackle a task more quickly and accurately, or in a way that could not be achieved by other means. Computer-aided design should involve the development of a central design description on which all applications in design and manufacture should feed. This implies that computer-based techniques for the analysis and simulation of the design, and for the generation of manufacturing instructions should be closely integrated with the techniques for modeling the form and structure of the design. In addition, a central design description forms an excellent basis for the concurrent development of all aspects of a design in simultaneous engineering activities. In principle, CAD could be applied throughout the design process, but in practice its impact on the early stages, where very imprecise representations such as sketches are used extensively, has been limited. It must also be stressed that at present CAD does not help the designer in the more creative parts of design, such as the generation of possible design solutions, or in those aspects that involve complex reasoning about the design – for example in assessing by visual examination of drawings whether a component may be made, or whether it matches the specification. So far, CAD systems have been described in very general terms. More specifically, they can be thought of as comprising: hardware: the computer and associated peripheral equipment, software: the computer program(s) running on the hardware; data: the data structure created and manipulated by the software; human knowledge and activities.

CAD systems are no more than computer programs (although often large and complex), perhaps using specialized computing hardware. The software normally comprises a number of different elements or functions that process the data stored in the database in different ways: model definition: for example to add geometric elements to a model of the form of a component; model manipulation: to move, copy, delete, edit or otherwise modify elements in the design model; picture generation: to generate images of the design model on a computer screen or on some hard-copy device; user interaction: to handle commands input by the user and to present output to the user about the operation of the system; database management: for the anagement of the files that make up the database; applications: these elements of the software do not modify the design model, but use it to generate information for evaluation, analysis or manufacture; utilities: a `catch-all’ term for parts of the software that do not directly affect the design model, but modify the operation of the system in some way (for example, to select the colors to be used for display, or the units to be used for construction of a drawing).


These features may be provided by multiple programs operating on a common database, or by a single program encompassing all of the elements.

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