Abstract
The authors have students draw Functional Requirement (FR) – Design Parameter (DP) charts for their free subject design assignments before teaching them Axiomatic Design (AD) in detail. The students cannot list all important FRs and DPs even with Zigzag thinking between FR and DP from higher level to lower; then, they tend to list FRs chronologically like flowcharts and DPs spatially like bill of material. The strategy, however, often results in different counts of FRs and DPs and a number of interferences among them. When this happens, we lead the students to carry out the thinking processes of functional integration of FRs and physical integration of DPs so they can reach a regular matrix for the design equation. Once regularization is reached, the students can apply independence axiom to improve their designs.
Highlights
Problems in defining functional requirement (FR) for design projectsEngineers start design thinking about some new solutions to meet social needs or, upon recognizing problems in conventional physical products or organizational systems, to improve them
The minimum definition is a set of functional requirement (FR) without planning on any design parameter (DP), that is, “FR first.”
FR is the very indicator that evaluates the new DP constructed by the designer, and at the same time it is the index for the customer to evaluate the design itself
Summary
Engineers start design thinking about some new solutions to meet social needs (design for creation) or, upon recognizing problems in conventional physical products or organizational systems, to improve them (design for improvement). Following the instruction to identify functions (FRs) related with each DP, they list, for example, “follow roads,” “stop at red lights,” “avoid vehicle in front,” “avoid pedestrians,” and “drive through poor weather.” Listing out all these elements, is difficult. The trend is not special to students who are novices in design, but even experienced engineers at corporations, without any experience of defining the products, have the same tendency Their recoverable method, meets their purposes of identifying all the FRs and DPs. Their recoverable method, meets their purposes of identifying all the FRs and DPs They start to try the Zigzag method with the collected FRs and DPs, and make a regular and uncoupled design matrix. This paper introduces this functional integration and physical integration with actual design cases
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