Geometry-based semantic ID for persistent and interoperable reference in feature-based parametric modeling

Wang, Yan; Nnaji, Bartholomew O.

doi:10.1016/j.cad.2004.11.009

Cited by 28 publications

(18 citation statements)

References 11 publications

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“…The general goal of an efficient parametric modeling methodology should be to build design trees that are simple, easy to understand, and with a small number of parent/child dependencies that properly convey design intent [34]. However, the three methodologies identified in our study approach part modeling from notably different directions and the results are CAD models that behave and react very differently to design changes.…”

Section: Related Workmentioning

confidence: 99%

Parametric CAD modeling: An analysis of strategies for design reusability

Camba

Contero

2016

Computer-Aided Design

124

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CAD model quality in parametric design scenarios largely determines the level of flexibility and adaptability of a 3D model (how easy it is to alter the geometry) as well as its reusability (the ability to use existing geometry in other contexts and applications). In the context of mechanical CAD systems, the nature of the feature-based parametric modeling paradigm, which is based on parent-child interdependencies between features, allows a wide selection of approaches for creating a specific model. Despite the virtually unlimited range of possible strategies for modeling a part, only a small number of them can guarantee an appropriate internal structure which results in a truly reusable CAD model. In this paper, we present an analysis of formal CAD modeling strategies and best practices for history-based parametric design: Delphi's horizontal modeling, explicit reference modeling, and resilient modeling. Aspects considered in our study include the rationale to avoid the creation of unnecessary feature interdependencies, the sequence and selection criteria for those features, and the effects of parent/child relations on model alteration. We provide a comparative evaluation of these strategies in the form of a series of experiments using three industrial CAD models with different levels of complexity. We analyze the internal structure of the models and compare their robustness and flexibility when the geometry is modified. The results reveal significant advantages of formal modeling methodologies, particularly resilient techniques, over non-structured approaches as well as the unexpected problems of the horizontal strategy in numerous modeling situations.

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Section: Related Workmentioning

confidence: 99%

Parametric CAD modeling: An analysis of strategies for design reusability

Camba

Contero

2016

Computer-Aided Design

124

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“…10. Each face of a feature can be assigned a unique name in terms of the feature's generating mode and its location in the feature shape [13][14][15]. Combining with the FeatureId, all the feature faces in the design model are named persistently, termed as the invariant name (IN).…”

Section: Feature-based Designmentioning

confidence: 99%

A new history-independent modeling approach for feature-based design

Yang

Ong

Nee

2011

Int J Adv Manuf Technol

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The majority of current feature-based modeling systems employ model history to store feature creation operations and re-execute them sequentially after each modification, which is called history-based modeling. Due to the static feature creation order, history-based modeling causes some problems during the reevaluation of the model, such as the evaluated model does not correspond to its specification, the operation can only refer to the boundary entities created by the previous operations, high computation cost, etc. In this research work, a new history-independent modeling approach is proposed. For the "remove feature" operation, only boundary faces originating from the feature being removed, and the intersecting features are modified for updating the resulting BRep model. For the "modify feature" operation, the feature being modified is first removed from the product model and then re-added with the new specifications, thus its creation step in the model history is changed. As a result, some of the problems caused by the static feature creation order are solved. During the reevaluation, the computation time is dependent solely on the execution of the feature and its intersecting features being edited. The computational complexity of the boundary evaluation using the proposed method for three representative models has been analyzed based on Open CASCADE. A case model was studied in a proof-of-concept prototype system to demonstrate the proposed modeling approach.

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“…Recent works, which investigate in this direction, are proposed by Bidarra [2], Wang [11] and Wu [12]. For Bidarra and al., the solution to persistent naming problem is feature-based.…”

Section: Characterization Based On Geometrymentioning

confidence: 99%

“…Different works in this domain focus on the persistent naming of atomic entities (vertices, edges or faces) in planar cases. Others recent works (Wang [11], Biddarra [2] or Wu [12]) consider the same problem in the non-planar context which is the most difficult one; and the persistent naming of curves (non-planar instances of edges) gathers the most part of difficulties. In the solutions proposed by [1,8,9], the topological entities are unambiguously characterized by an appropriate discriminating attribute.…”

Section: Introductionmentioning

confidence: 99%

A Method to Improve Matching Process by Shape Characteristics in Parametric Systems

Baba-Ali¹,

Marcheix²,

Skapin³

2009

Computer-Aided Design and Applications

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In current parametric systems, the persistent naming issue (based on edge mappings of intersecting surfaces) is not as fully supported as it should be. Unpredictability and ambiguity of models often happen during design reevaluation within systems. This reference deficiency is widely treated in the literature, especially about non-planar entities during design construction. Although related works ensure the uniqueness of the references to topological entities, they often neglect the shape characteristics of surfaces and give results different from those expected during design reevaluation. We propose in this paper a method to add some additional information about surfaces to improve such works. We compute those information by decomposing surfaces according to hump(s) and/or hollow(s). More precisely, our method use local extremums and inflexion curves to obtain one hump or hollow per sub-surface. The existing matching processes replace every surface with their corresponding subsurfaces, leading to the right edge mappings.Keywords: Persistent naming, shape characteristics, matching process, curved entities. DOI: 10.3722/cadaps.2009.xxx-yyy 1. INTRODUCTION Reuse of part model is an important issue in CAD, architecture or geology domains. Nowadays, feature-based parametric systems enable easy conception and modification of parts. Indeed, it has been estimated that almost 80% of all design tasks consists in adapting an existing model [9] by some simple modification of dimension values, constraint relations and feature definitions. A feature-based parametric system contains the topological representation (i.e. n-Dim entities: vertex, edge, face, volume and topological adjacency relations between these entities), geometric representation (i.e. embedding of these entities) of an object, a set of parameters (characteristics of the object) and a set of constraints (equations or functions) applied to the object. By extension, a parametric modeler is a geometric conception system which not only preserves the explicit geometry of the designed object (so called parametric object or current instance), but also the sequence of commands used for generating it (so called design process, constructive gestures or parametric specification). The majority of current feature-based parametric systems are known as procedural or history-based systems because parametric specification can be regarded as a composition of modeling functions, where each function is attached via its parameters to topological entities defined in some previous states of the model. Referenced entities must then be named in a persistent way in order to be able to reevaluate the model in a coherent way. Particularly, when reevaluation leads to topological

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Geometry-based semantic ID for persistent and interoperable reference in feature-based parametric modeling

Cited by 28 publications

References 11 publications

Parametric CAD modeling: An analysis of strategies for design reusability

Parametric CAD modeling: An analysis of strategies for design reusability

A new history-independent modeling approach for feature-based design

A Method to Improve Matching Process by Shape Characteristics in Parametric Systems

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