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Chapter1 Introduction

1.7 CAD Software

CAD software are written in FORTRAN and C languages. FORTRAN provides the number crunching, where as, C language provides the visual images. Early CAD packages were turnkey systems, i.e., the CAD packages were sold as an integrated software and hardware package, with no flexibility for using second vendor hardware (1970s and 80s). These systems were based on 16-bit word, and were incapable of networking. The modern CAD software utilizes the open architecture system, i.e., software vendors do not design and manufacture their own hardware. Third party software can be used to augment the basic CAD package. Most popular CAD package will facilitate integration of the Finite Element Analysis and other CAD software from more than one vendor. For example, IDEAS preprocessor can work with almost all the FEA packages for pre and post analyses.

Networking is an important consideration in applications of CAD software. A model created by one engineer must be readily accessible to others in an organization, which is linked by a LAN or other means. The designer, analyst, management, marketing, vendor, and others generally share a model. This is the concurrent engineering in action, mentioned earlier.

Lecture Notes © by R. B. Agarwal

Computer Aided Design in Mechanical Engineering

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