CAD Feature Validation for Direct Modeling
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Solution Overview
Problem
Current CAD systems face challenges in balancing editing freedom with the preservation of design intent, as parametric feature-based modeling is complex and resource-intensive, while direct modeling lacks mechanical integrity and computational efficiency.
Innovation Solution
A CAD system that associates geometric faces with rules and data objects, allowing edits to be made freely while validating features to maintain design intent, similar to direct modeling, but with the integrity of parametric feature-based modeling by updating or creating new features based on edit operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parametric feature based modeling is used to preserve design intent, then mechanical integrity is maintained, but device complexity and computational resources increase significantly
Solution Approach 1:
The patent extracts the essential validation logic from complex parametric feature-based modeling and isolates it into a separate validation module. This allows the system to maintain design intent through targeted validation of geometric faces and features without requiring the full complexity of traditional parametric modeling, thereby reducing overall device complexity while preserving reliability
Solution Approach 2:
The patent introduces an intermediary validation mechanism that sits between direct modeling operations and the final model state. This intermediary layer validates geometric faces and features against design intent rules without requiring full parametric feature-based modeling infrastructure, thus maintaining design integrity while reducing computational overhead and complexity
2Reliability
If parametric feature based modeling is used to maintain design integrity, then mechanical soundness is preserved, but editing time increases due to history regeneration
Solution Approach 1:
The patent applies partial validation action by validating only the specific geometric faces and features affected by an edit operation rather than regenerating the entire model history. This selective validation approach maintains mechanical soundness for the modified portions while significantly reducing editing time by avoiding unnecessary full-model regeneration
Solution Approach 2:
The patent enables skipping the time-consuming history regeneration step by implementing direct validation of geometric faces against design intent rules. The system rushes through the validation process by checking only the necessary geometric constraints and features affected by the edit, thereby maintaining mechanical soundness without the time penalty of full history re-execution
3Productivity
If direct modeling is used for quick editing, then computational resources are reduced, but design intent is lost and mechanical integrity is compromised
Solution Approach 1:
The patent implements feedback mechanisms that continuously validate geometric faces and features against design intent rules during direct modeling operations. This feedback loop provides real-time verification of mechanical integrity constraints, allowing quick editing while preventing violations of design intent, thus maintaining reliability without sacrificing productivity
4Ease of operation
If direct modeling is used for free editing, then ease of operation improves, but design intent preservation deteriorates
Solution Approach 1:
The patent enables the modeling system to self-validate geometric faces and features against design intent rules automatically during editing operations. This self-service validation mechanism provides editing freedom like direct modeling while automatically maintaining design intent preservation, thus improving ease of operation without sacrificing reliability
Data Source
AI summary
A CAD system enables a designer to freely modify a model of a design without regenerating a history of the model, as in traditional parametric feature based modeling. The CAD system automatically determines whether the modifications to the model invalidate current features associated with the model and whether the modifications create new features that should be added to the model. Such a CAD system enables a designer to quickly edit designs and simultaneously preserve design intent without requiring the significant computational resources of historical based approaches that regenerate a geometry upon every edit made by a designer.