Fast global and partial reflective symmetry analyses using boundary surfaces of mechanical components

Abstract

. Fast global and partial reflective symmetry analyses using boundary surfaces of mechanical components. Computer-Aided Design, Elsevier, 2014, 53, pp.70-89 *Highlights (for review) it performs at the same level of tolerance than geometric modelers and it is independent of the face and edge parameterizations.

Applying geometric constraints for perfecting CAD models in reverse engineering

“…Tate and Jared [8] present a detailed review on related topics, and discuss an algorithm to compute symmetries based on matching various topological entities, such as edge-loops. In a recent paper, Li et al [9] explore the problem of extracting exact symmetries from B-rep models using a divide-and-conquer approach. The above publications, however, are not well-suited for reverse engineering applications and in the rest of this section we will review some research articles dealing with this specific problem.…”

“…fillets), (9) perfecting surfaces (including constrained fitting and surface fairing), (10) creating a B-rep model (i.e., stitching surfaces and building up a topological structure), (11) exporting to CAD/CAM systems.…”

Identification of Regularities in CAD Part and Assembly Models

“…This property greatly reduces the search field for symmetry extraction. Among the research works more targeted to engineering applications, the algorithms aimed at partial symmetry detection [1,4,5,6,7] share many similarities in their structure and the main stages of these approaches can be summarized as follows:…”

“…In practice, this helps locating the machining and assembly arms when the product needs to be machined and assembled [5]. Similarly, in the shape adaptation process for finiteelement analysis symmetries can be used to facilitate the simplification of the model for the validation stage [4]. In some cases, B-Rep models arise from reverse engineering process thus the design intent is completely lost and detecting symmetries could be very helpful to recover it [6].…”

Research on Shape Feature Recognition of B-Rep Model Based on Wavelet Transform

“…An ontology-based feature recognition framework is proposed, in which the features are detected from STEP files and then represented as abstract concepts regarding some geometrical or topological patterns in order to share a common understanding of feature representation [18]. An approach to global and local reflective symmetry features for B-Rep model is proposed, which divides and conquers over AAG with the five types of faces as atomic entities [19]. It is often seen that manufacturing features are extracted by attributed adjacency subgraph matching from STEP files, for example, the various strings of cylinder and cross holes as the features of turned components [20].…”