The Computer-Based Design Process by A. J. Medland

By A. J. Medland

The subject referred to as computer-aided layout and manufacture has built speedily over the past two decades. the variety of configurations and aiding software program on provide to the aptitude person is bewildering. This extends from the cheap single-user micro-based procedure, via to the great business networks that are supported through many distant mainframe machines and feature been said to provider as much as one thousand workstations. This develop in expertise has been pushed by way of, and in its flip has fuelled, the advance of ever higher computing strength and snap shots potential. it's those gains that every one operating within the box may now realize as necessary to any CADCAM process. attempt has therefore been positioned into constructing more than a few structural and stable modellers which, along with the suitable terminal configuration and ray tracing photographs know-how, can build images of uncanny realism. complex research courses were built that could calculate the stresses in complicated constructions and reveal the consequences as color shaded maps upon the skin of a pictorial view of the article. If the time to procedure and the approach fee are missed, then the plain ease with which those structures practice such research and generate such top of the range photos, leaves the observer awe struck.

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Conversely, correct gearbox functioning is unacceptable if it results in an unacceptable gear-lever movement (either too small, too large, colliding with other fixed objects, difficult hand movements etc). 24), which are mapped and preserved within the geometric domain. 25). This file maintains, in addition to the normal component information, a description of the spaces occupied by the individual components. These are established Design theory 57 automatically from the maximum and minimum excursions of the component within the reference space.

All of these dictate the nature of the actual car under consideration and can all be considered as attributes of the functional domain called 'car'. 20 Relationship between functional and geometric domains Design theory 55 Mapped on to this functional domain is the geometric domain. This contains the assemblies, sub-assemblies and component parts in a normal hierarchical bill-of-material structure. The domain of 'car' thus contains all other sub or component domains. This initially breaks the space up into its major divisions: the engine unit, passenger unit, suspension, transmission, etc.

Therefore, the system unfamiliarity was diminished before subjects were required to solve the problems and compare the techniques. The order in which the techniques were presented to the subjects was varied, in a further attempt to reduce the effect of system unfamiliarity. Whilst the experiment was limited to trainee/engineers and by the type of microcomputer used, the results of this investigation indicated that: 1) the mode of man-machine interaction which was most popular and has the fewest dissenters, was one in which the user directed the course of action, as in the modular program; 2) a fast design time was most likely to be achieved by the use of an optimization technique; 3) an optimum design was most likely to be achieved by a preprogrammed optimization technique, but only where the problem, design parameters and constraints were understood; 4) the technique thought most likely to allow some gaining of insight was one in which the user has control of the program, as in the modular program.

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