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Research Papers

Validity Maintenance for Freeform Feature Modeling

[+] Author and Article Information
Eelco van den Berg

Faculty of Electrical Engineering, Mathematics and Computer Science, Delft University of Technology, Mekelweg 4, NL-2628 CD Delft, The Netherlandsevdberg@gmail.com

Willem F. Bronsvoort

Faculty of Electrical Engineering, Mathematics and Computer Science, Delft University of Technology, Mekelweg 4, NL-2628 CD Delft, The Netherlandsw.f.bronsvoort@tudelft.nl

J. Comput. Inf. Sci. Eng 10(1), 011006 (Feb 16, 2010) (14 pages) doi:10.1115/1.3264573 History: Received March 21, 2007; Revised June 18, 2009; Published February 16, 2010; Online February 16, 2010

Feature modeling is nowadays the predominant way of product modeling. Functional and geometric information are stored in a single product model, consisting of features such as holes, slots, and ribs. An emerging technology is the application of concepts of feature modeling to freeform shapes. Of particular importance here is that there are often many validity conditions, or constraints, that the resulting freeform feature models should satisfy. An example of this is a maximum curvature constraint on the faces of a particular feature. This paper presents an approach to specify and maintain such validity conditions for freeform feature models.

FIGURES IN THIS ARTICLE
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Copyright © 2010 by American Society of Mechanical Engineers
Topics: Modeling , Shapes
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References

Figures

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Figure 1

A freeform volumetric feature model

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Figure 2

Definition of a freeform profile: (a) profile through twenty FFDPs and (b) subset of the distance and angle constraints in the profile

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Figure 3

Shape prototype of a car seat feature constructed with the profile from Fig. 2

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Figure 4

Parameterization of the profile of the car seat feature of Figs.  23

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Figure 5

Validity maintenance scheme for feature addition operation

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Figure 6

Freeform feature addition operation with constraint violation: (a) the initial feature model and (b) the invalid feature model

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Figure 7

Validity maintenance scheme for feature modification operation

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Figure 8

Freeform feature modification operation with constraint violation: (a) the initial feature model and (b) the invalid feature model

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Figure 9

Validity maintenance scheme for feature removal operation

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Figure 10

Freeform feature removal operation with constraint violation: the removal of the rib feature is not allowed because the blind hole depends on it

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Figure 11

The validity recovery manager showing a violation of a transitional continuity constraint

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Figure 12

Background information on transitional continuity constraints

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