A hierarchically structured and constraint-based data model for intuitive and precise solid modeling in a virtual reality environment

Ma, Weiyin; Zhong, Yongmin; Tso, S.K.; Zhou, Tianxiang

doi:10.1016/j.cad.2003.09.001

Cited by 39 publications

(29 citation statements)

References 14 publications

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“…However, as discussed by Berta [9], the conversion process may encounter several limitations such as loss of assembly structure, loss of object's semantics and topological information. To overcome these obstacles, solutions such as geometry-based VR applications [6] or integrating VR techniques into the core of CAD systems [9,10] have been explored. In our earlier work [11], a CAD linked virtual assembly environment has been proposed.…”

Section: Visualization Technologies For Virtual Assemblymentioning

confidence: 99%

Interactive visualization of complex dynamic virtual environments for industrial assemblies

Wang¹,

Li²

2006

Computers in Industry

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Section: Visualization Technologies For Virtual Assemblymentioning

confidence: 99%

Interactive visualization of complex dynamic virtual environments for industrial assemblies

Wang¹,

Li²

2006

Computers in Industry

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“…For example, integrations between design systems and reverse engineering (Varady et al 1997;Benko et al 2001), rapid prototyping (Starly et al 2005), coordinate measurement (Kramer et al 2001), mesh generation (Rezayat 1996), virtual reality (Ma et al 2004b), process planning (Fuh and Chang 1996), and assembly systems (Noort et al 2002) have been widely studied. In these publications, the application integration is based on geometric neutral data formats, such as the Initial Graphics Exchange Specification (IGES) or the STandard for the Exchange of Product model data (STEP) (ISO 2000).…”

Section: Application Integrationmentioning

confidence: 99%

Paradigm shift: unified and associative feature-based concurrent and collaborative engineering

Chen

Thimm

2008

J Intell Manuf

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With widely used concurrent and collaborative engineering technologies, the validity and consistency of product information become important. In order to establish the state of the art, this paper reviews emerging concurrent and collaborative engineering approaches and emphasizes on the integration of different application systems across product life cycle management (PLM) stages. It is revealed that checking product information validity is difficult for the current computer-aided systems because engineering intent is at best partially represented in product models. It is also not easy to maintain the consistency among related product models because information associations are not established. The purpose of this review is to identify and analyze research issues with respect to information integration and sharing for future concurrent and collaborative engineering. A new paradigm of research from the angle of feature unification and association for product modeling and manufacturing is subsequently proposed.Keywords Concurrent and collaborative engineering · Feature-based design and manufacturing · Product life cycle modeling · Information validity and consistency

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“…Park and Cutkosky [15] mentioned using dependencies at different abstraction levels to maintain information consistency. Ma et al [9] also proposed a hierarchical model to represent geometric relations in a detailed design model. Eastman [5] proposed an algorithm of maintaining the integrity conditions between different interacted applications.…”

Section: Dependency Network and Its Implementationmentioning

confidence: 99%

Knowledge-Based Reasoning in a Unified Feature Modeling Scheme

Chen

Thimm

et al. 2005

Computer-Aided Design and Applications

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Feature-based modeling is an accepted approach to include high-level geometric information in product models as well as to facilitate a parameterized and constraint-based product development process. Moreover, features are suitable as an intermediate layer between a product's knowledge model and its geometry model for effective and efficient information management. To achieve this, traditional feature technology must be extended to align with the approach of knowledge-based reasoning. In this paper, based on a previously proposed unified feature modeling scheme, feature definitions are extended to support knowledge-based reasoning. In addition, a communication mechanism between the knowledge-based system and the feature model is established. The methods to embed and use knowledge for information consistency control are described.Keywords: Unified feature; Knowledge-based reasoning; Feature-based modeling INTRODUCTIONHistorically, computer-aided tools, such as CAD, CAPP and CAM systems are developed to support the corresponding product lifecycle phases. Product geometry takes up a significant position in these systems. Feature technology is mainly used to provide high-level geometric representations to facilitate parameterized and constraint-based product geometric design process. However, traditional CAD systems usually assume that a designer has already finished the conceptual design as well as the concept-to-geometry mapping [17]. Therefore, only geometric modeling functions are provided in these CAD systems. Due to this limitation, some information, such as the design intent and the process patterns, is lost during the design process. Explicitly embedding knowledge-based reasoning processes within the traditional engineering systems can significantly enhance the systems' reusability, scalability and flexibility. Knowledge-oriented techniques can support more complex tasks with natural human-oriented intelligent processes. They are more acceptable by human-beings than dataoriented techniques. They can also represent and deal with inaccurate and incomplete information as well as rule-ofthumbs, which are usually difficult to be described mathematically. Due to the different natures between the knowledge information entities and the geometric entities, to interface the knowledge-based reasoning processes with the geometric modeling processes, an intermediate information layer is necessary. Feature-based technology can provide such a bridge. However, the current feature modeling technology has to be extended in two directions. First, feature definitions need to be extended to support knowledge-based reasoning processes. The purpose of this extension are checking and maintaining feature validity in the view of design intent. In other words, each feature model should be consistent to its specific knowledge bases. Second, the communication mechanism between the knowledge bases and the feature models must be established. This paper is intended to address the key issues for enabling knowledge-based reasoning in...

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A hierarchically structured and constraint-based data model for intuitive and precise solid modeling in a virtual reality environment

Cited by 39 publications

References 14 publications

Interactive visualization of complex dynamic virtual environments for industrial assemblies

Interactive visualization of complex dynamic virtual environments for industrial assemblies

Paradigm shift: unified and associative feature-based concurrent and collaborative engineering

Knowledge-Based Reasoning in a Unified Feature Modeling Scheme

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