A constraint manager to support virtual maintainability

Marcelino, Luís; Murray, Norman; Fernando, Terrence

doi:10.1016/s0097-8493(02)00228-5

Cited by 64 publications

(29 citation statements)

References 8 publications

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“…The second are geometric constraints which relate part features and are applied when related objects are in proximity. Geometric constraints are useful in precise part positioning tasks in a virtual environment where physical constraints are absent [55,56]. Constraint based methods summarized in section 3.2 are used to solve for relative object movements.…”

Section: Constraint-based Assembly Applicationsmentioning

confidence: 99%

“…Many constraint-based virtual assembly systems also incorporated collision detection between models to prevent model interpenetration during assembly. Advanced constraint-based methods were successful in identifying, validating and applying constraints onthe-fly and thus did not require importing predefined CAD constraints [56,124]. Although, systems using constraint-based modeling prove successful in simulating object's kinematics for Other research incorporated simulation of the real world physical behavior of parts ( Figure 11).…”

Section: Collision Snappingmentioning

confidence: 99%

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Virtual reality for assembly methods prototyping: a review

2010

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Assembly planning and evaluation is an important component of the product design process in which details about how parts of a new product will be put together are formalized. A well designed assembly process should take into account various factors such as optimum assembly time and sequence, tooling and fixture requirements, ergonomics, operator safety, and accessibility, among others. Existing computer-based tools to support virtual assembly either concentrate solely on representation of the geometry of parts and fixtures and evaluation of clearances and tolerances or use simulated human mannequins to approximate human interaction in the assembly process. Virtual reality technology has the potential to support integration of natural human motions into the computer aided assembly planning environment (Ritchie et al. in Proc I MECH E Part B J Eng 213(5): [461][462][463][464][465][466][467][468][469][470][471][472][473][474] 1999). This would allow evaluations of an assembler's ability to manipulate and assemble parts and result in reduced time and cost for product design. This paper provides a review of the research in virtual assembly and categorizes the different approaches. Finally, critical requirements and directions for future research are presented. Disciplines Computer-Aided Engineering and Design | Graphics and Human Computer InterfacesComments This is a manuscript of an article from Virtual Reality 15 (2011) AbstractAssembly planning and evaluation is an important component of the product design process in which details about how parts of a new product will be put together are formalized. A well designed assembly process should take into account various factors such as optimum assembly time and sequence, tooling and fixture requirements, ergonomics, operator safety, and accessibility, among others.Existing computer-based tools to support virtual assembly either concentrate solely on representation of the geometry of parts and fixtures and evaluation of clearances and tolerances or use simulated human mannequins to approximate human interaction in the assembly process.Virtual reality (VR) technology has the potential to support integration of natural human motions into the computer aided assembly planning environment (CAAP) [1]. This would allow evaluations of an assembler's ability to manipulate and assemble parts and result in reduced time and cost for product design. This paper provides a review of the research in virtual assembly and categorizes the different approaches Finally, critical requirements and directions for future research are presented.

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Section: Constraint-based Assembly Applicationsmentioning

confidence: 99%

Section: Collision Snappingmentioning

confidence: 99%

Virtual reality for assembly methods prototyping: a review

2010

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“…Marcelino et al [15] developed a geometric constraint manager to simulate assembly and disassembly tasks in VR using direct interaction, automatic geometric constraint recognition, geometric constraint satisfaction and constrained motion. Seth et al [16] developed a feature-based approach to geometric constraint recognition by taking advantage of dynamically contacting BREP features to predict assembly intent.…”

Section: Geometricmentioning

confidence: 99%

BREP Identification During Voxel-Based Collision Detection for Haptic Manual Assembly

Faas

Vance

2011

ASME 2011 World Conference on Innovative Virtual Reality

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This paper presents a novel method to tie geometric boundary representation (BREP) to voxel-based collision detection for use in haptic manual assembly simulation. Virtual Reality, in particular haptics, has been applied with promising results to improve preliminary product design, assembly prototyping and maintenance operations. However, current methodologies do not provide support for low clearance assembly tasks, reducing the applicability of haptics to a small subset of potential situations. This paper discusses a new approach, which combines highly accurate CAD geometry (boundary representation) with voxel models to support a hybrid method involving both geometric constraint enforcement and voxel-based collision detection to provide stable haptic force feedback. With the methods presented here, BREP data can be accessed during voxel-based collision detection. This information can be used for constraint recognition and lead to constraint-guidance during the assembly process. ABSTRACTThis paper presents a novel method to tie geometric boundary representation (BREP) to voxel-based collision detection for use in haptic manual assembly simulation. Virtual Reality, in particular haptics, has been applied with promising results to improve preliminary product design, assembly prototyping and maintenance operations. However, current methodologies do not provide support for low clearance assembly tasks, reducing the applicability of haptics to a small subset of potential situations. This paper discusses a new approach, which combines highly accurate CAD geometry (boundary representation) with voxel models to support a hybrid method involving both geometric constraint enforcement and voxel-based collision detection to provide stable haptic force feedback. With the methods presented here, BREP data can be accessed during voxel-based collision detection. This information can be used for constraint recognition and lead to constraint-guidance during the assembly process.

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“…A geometric constraint manager system was developed by Marcelino et al [34] at University of Salford, for simulating interactive assembly/disassembly tasks in VEs. The system supported multi-platform operation, multiple constraint recognition and automatic constraint management.…”

Section: Introductionmentioning

confidence: 99%

Combining Geometric Constraints With Physics Modeling for Virtual Assembly Using SHARP

Seth

Vance

Oliver

2007

Volume 2: 27th Computers and Information in Engineering Conference, Parts a and B

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This research combines physics-based and constraint-based approaches for virtual assembly simulations where geometric constraints are created or deleted within the virtual environment at runtime. In addition, this research provides a solution to low clearance assembly by utilizing B-Rep data representation of complex CAD models for accurate collision/physics results. These techniques are demonstrated in the SHARP software (System for Haptic Assembly and Realistic Prototyping). Combining physics-based and constraintbased techniques and operating on accurate B-rep data, SHARP can now assemble parts with 0.001% clearance and can accurately detect collision responses with 0.0001mm accuracy. Case studies are presented which can be used to identify the suitable combination of methods capable of best simulating intricate interactions and environment behavior during manual assembly. ABSTRACTThis research combines physics-based and constraint-based approaches for virtual assembly simulations where geometric constraints are created or deleted within the virtual environment at runtime. In addition, this research provides a solution to low clearance assembly by utilizing B-Rep data representation of complex CAD models for accurate collision/physics results. These techniques are demonstrated in the SHARP software (System for Haptic Assembly and Realistic Prototyping). Combining physics-based and constraint-based techniques and operating on accurate B-rep data, SHARP can now assemble parts with 0.001% clearance and can accurately detect collision responses with 0.0001mm accuracy. Case studies are presented which can be used to identify the suitable combination of methods capable of best simulating intricate interactions and environment behavior during manual assembly.

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A constraint manager to support virtual maintainability

Cited by 64 publications

References 8 publications

Virtual reality for assembly methods prototyping: a review

Virtual reality for assembly methods prototyping: a review

BREP Identification During Voxel-Based Collision Detection for Haptic Manual Assembly

Combining Geometric Constraints With Physics Modeling for Virtual Assembly Using SHARP

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