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Simulated annealing-based fitting of CAD models to point clouds of mechanical parts’ assemblies

Article dans une revue avec comité de lecture
Author
ccSHAH GHAZANFAR, Ali
105078 Dipartimento di Informatica, Matematica, Elettronica e Trasporti [Reggio Calabria] [DIMET]
488980 Istituto di Matematica Applicata e Tecnologie Informatiche del C.N.R.
543315 Laboratoire d’Ingénierie des Systèmes Physiques et Numériques [LISPEN]
POLETTE, Arnaud
543315 Laboratoire d’Ingénierie des Systèmes Physiques et Numériques [LISPEN]
PERNOT, Jean-Philippe
543315 Laboratoire d’Ingénierie des Systèmes Physiques et Numériques [LISPEN]
GIANNINI, Franca
73335 Istituto di Matematica Applicata e Tecnologie Informatiche [IMATI-CNR]
MONTI, Marina
73335 Istituto di Matematica Applicata e Tecnologie Informatiche [IMATI-CNR]

URI
http://hdl.handle.net/10985/22780
DOI
10.1007/s00366-020-00970-8
Date
2020-02-18
Journal
Engineering with Computers

Abstract

This paper introduces a new ftting approach to allow an efcient part-by-part reconstruction or update of editable CAD models fitting the point cloud of a digitized mechanical parts′ assembly. The idea is to make use of parameterized CAD mod els whose dimensional parameters are to be optimized to match the acquired point cloud. Parameters may also be related to assembly constraints, e.g. the distance between two parts. The optimization kernel relies on a simulated annealing algorithm to fnd out the best values of the parameters so as to minimize the deviations between the point cloud and the CAD models to be ftted. Both global and local ftting are possible. During the optimization process, the orientation and positioning of the CAD parts are driven by an ICP algorithm. The modifcations are ensured by the batch calls to a CAD modeler which updates the models as the ftting process goes on. The modeler also handles the assembly constraints. Both single and multiple parts can be ftted, either sequentially or simultaneously. The evaluation of the proposed approach is performed using both real scanned point clouds and as-scanned virtually generated point clouds which incorporate several artifacts that could appear with a real scanner. Results cover several Industry 4.0 related application scenarios, ranging from the global ftting of a single part to the update of a complete Digital Mock-Up embedding assembly constraints. The proposed approach demonstrates good capacities to help maintaining the coherence between a product/system and its digital twin

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