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Adaptive Free-form Deformation for the Modification of CAD/CAM Data

Authors:
Alexei Sacharow
Tobias Surmann
Dirk Biermann

Keywords: CAD; free-form deformation; reverse engineering

Abstract:
In production engineering, the process of reverse engineering often requires modifications of CAD/CAM data. In general, CAD surfaces are modified according to a set of discrete displacement vectors. For this purpose, smoothing space-deformation techniques like free-form deformation (FFD) can be used. We present a B-spline-based adaptive FFD, which is able to ensure a user-defined shape accuracy. In an iterative process, the control-point lattice of the B-spline volume is automatically refined so that the approximation errors resulting from the direct free-form deformation decrease. Therefore, the areas inside the volume with the highest deformation are identified and subsequently refined by inserting new knots into the B-spline volume. Numerical studies have shown that the presented method improves the common B-spline-based FFD technique with respect to accuracy and efficiency.

Pages: 27 to 31

Copyright: Copyright (c) IARIA, 2011

Publication date: November 20, 2011

Published in: conference

ISSN: 2308-4499

ISBN: 978-1-61208-172-4

Location: Lisbon, Portugal

Dates: from November 20, 2011 to November 25, 2011