0
Research Papers

A Methodology for Creating Shape Rules During Product Design

[+] Author and Article Information
Adam Oster

 University of Idaho, Moscow, ID 83844oste1400@vandas.uidaho.edu

Jay McCormack

 University of Idaho, Moscow, ID 83844mccormack@uidaho.edu

J. Mech. Des 133(6), 061007 (Jun 16, 2011) (12 pages) doi:10.1115/1.4004195 History: Received October 05, 2010; Revised April 28, 2011; Published June 16, 2011; Online June 16, 2011

Shape grammars provide the means to represent the physical embodiment of a class of products in a set of generative rules. Once developed, the shape grammar can be used to generate new forms through automated synthesis or interaction by one or more designers. Creating the shape rules has been most often performed after the design process by examining existing designs. Furthermore, the approach to create a set of rules from an existing set of products was usually an ad hoc process of generalizing form, identifying feature options, and classifying logical subdivisions of the complete product geometry. This paper proposes a more explicit method of shape grammar creation, that is, aligned with well-known design methodologies in order to enable the creation of a shape grammar during the new product development process. The established methodology for function first design and design exploration provides many of the requisite steps for creating a shape grammar, connecting customer requirements and constraints to product form and provides a skeleton onto which a rule creation approach is mapped. An example is included in which the proposed methodology is used to create a shape grammar that represents the internal components of a bladeless slurry pump in order to support design exploration driven by simulation and experimentation.

Copyright © 2011 by American Society of Mechanical Engineers
Topics: Design , Pumps , Shapes
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

An example of a shape grammar rule, the headlight design that it was used to produce, and an actual vehicle headlight

Grahic Jump Location
Figure 2

A shape rule and shape in which the rule can be applied

Grahic Jump Location
Figure 3

Instances of shape A in shape C are shown in bold (from Fig. 2)

Grahic Jump Location
Figure 4

Designs in the language defined by the initial shape and rule in Fig. 2

Grahic Jump Location
Figure 5

A shape rules that adds a gear to an identified shaft

Grahic Jump Location
Figure 6

The hierarchy of functions, component types, modules, and the overall product function

Grahic Jump Location
Figure 7

The tree of design decision-making where siblings are alternatives from the morphological chart

Grahic Jump Location
Figure 8

A rule derived from the hierarchy of design alternatives in Fig. 7 to add and position the geometry of design alternative x

Grahic Jump Location
Figure 9

Activity diagram of the bladeless pump

Grahic Jump Location
Figure 10

Aggregate function structure of the pump that addresses the list of requirements in Table 2 as well as the three primary functional modules in the pump

Grahic Jump Location
Figure 11

Hierarchical chart of modules, component types, and functions

Grahic Jump Location
Figure 12

The shapes for (a) the ball type thrust bearings, (b) the mechanical seals, (c) the stepped shaft, and (d) the disc

Grahic Jump Location
Figure 13

A rough layout of the hierarchy elements identified in Fig. 1 and explored in Table 4

Grahic Jump Location
Figure 14

The initial shape includes a coordinate system and constraints

Grahic Jump Location
Figure 15

The sequence of design decision-making that can be represented by the shape grammar. For this pump, the details of the ball type thrust bearing, mechanical shaft seal, stepped shaft, and discs are explored (shown in gray)

Grahic Jump Location
Figure 16

Rule 1 in the shape grammar creates and positions ball type thrust bearings

Grahic Jump Location
Figure 17

Rule 2 in the shape grammar creates and positions the mechanical shaft seal with respect to the bearings

Grahic Jump Location
Figure 18

Rule 3 in the shape grammar that creates and positions the stepped shaft

Grahic Jump Location
Figure 19

Rule 4 in the shape grammar adds the first disc to the shaft

Grahic Jump Location
Figure 20

Rule 5 in the grammar adds additional discs to the pump

Grahic Jump Location
Figure 21

Rule 6 in the grammar creates and positions a labyrinth type seal

Grahic Jump Location
Figure 22

Rule 7 in the grammar adds holes to a disc in pump

Grahic Jump Location
Figure 23

Rule 8 in the grammar adds holes to a disc in pump

Grahic Jump Location
Figure 24

The grammatical representation of the pump was used to generate (a) the CAD representation of the pump and (b) the pump operating on a sand slurry

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In