10 . Representation of Conceptual Mechanical Design Knowledge

Conceptual design is typically not well represented by traditional engineering mathematics. This work is concerned with acquiring (by protocol analysis) and representing the knowledge used in the conceptual stage of mechanism design. This is the first stage of design, and, along with formulating the problem, establishes a function structure and selects processes and geometries for components realizing the functions. A formally based representation is developed that reveals conceptual connections and explicates terms and their valid patterns of use. The formalisms are largely adopted from theoretical computer science. Two knowledge components are formulated: one reveals the designer's view of the problem as it evolves, and the other captures aspects of control and strategy. The reliability of these schemes is addressed, methods of collecting and encoding protocols are discussed, and characteristics of conceptual mechanical design are identified.