A Universal Feature Definition Frame for 3-D CAD Model Conversion

2013 ◽  
Vol 690-693 ◽  
pp. 2781-2786
Author(s):  
Chang Le Sun ◽  
Da Yong Ning ◽  
Wei Xiong ◽  
Hai Tao Wang
Keyword(s):  
Data Exchange ◽  
Target System ◽  
Cad Model ◽  
Important Research ◽  
General Outline ◽  
Cad Systems ◽  
Target Model ◽  
Universal Feature ◽  
Cad Models ◽  
Model Conversion

Data exchange between 3-D CAD systems has a very important research value both in theory and in application. This paper presents a general outline of a Universal Feature Definition (UFD) frame, which provides universal support for todays 3-D CAD systems. Through the medium of UFD feature, this frame can realize the conversion of 3-D CAD models from source system to target system according to API mapping. This CAD model conversion method may overcome the disadvantage of traditional geometric method that the target model is not editable. This frame also provides the conversion interface of user defined features, which is convenient for the user to customize the desired conversion process. The frame has been implemented between Catia and UG with successful results.

scholarly journals A multi-user selective undo/redo approach for collaborative CAD systems

2014 ◽  
Vol 1 (2) ◽  
pp. 103-115 ◽  
Author(s):  
Yuan Cheng ◽  
Fazhi He ◽  
Bin Xu ◽  
Soonhung Han ◽  
Xiantao Cai ◽  
...  
Keyword(s):  
Cad Model ◽  
Feature Combination ◽  
Collaborative Systems ◽  
Cad Systems ◽  
Cad System ◽  
Design Error ◽  
Engineering Design Process ◽  
Dependency Relationship ◽  
Cad Models ◽  
Remote Sites

Abstract The engineering design process is a creative process, and the designers must repeatedly apply Undo/Redo operations to modify CAD models to explore new solutions. Undo/Redo has become one of most important functions in interactive graphics and CAD systems. Undo/Redo in a collaborative CAD system is also very helpful for collaborative awareness among a group of cooperative designers to eliminate misunderstanding and to recover from design error. However, Undo/Redo in a collaborative CAD system is much more complicated. This is because a single erroneous operation is propagated to other remote sites, and operations are interleaved at different sites. This paper presents a multi-user selective Undo/Redo approach in full distributed collaborative CAD systems. We use site ID and State Vectors to locate the Undo/Redo target at each site. By analyzing the composition of the complex CAD model, a tree-like structure called Feature Combination Hierarchy is presented to describe the decomposition of a CAD model. Based on this structure, the dependency relationship among features is clarified. B-Rep re-evaluation is simplified with the assistance of the Feature Combination Hierarchy. It can be proven that the proposed Undo/Redo approach satisfies the intention preservation and consistency maintenance correctness criteria for collaborative systems.

Status, Comparison, and Issues of Computer-Aided Design Model Data Exchange Methods Based on Standardized Neutral Files and Web Ontology Language File

2016 ◽  
Vol 17 (1) ◽  
Author(s):  
Yuchu Qin ◽  
Wenlong Lu ◽  
Qunfen Qi ◽  
Xiaojun Liu ◽  
Yanru Zhong ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Data Exchange ◽  
Cad Model ◽  
Web Ontology Language ◽  
Model Data ◽  
Cad Systems ◽  
Ontology Language ◽  
Depth Analysis ◽  
Computer Aided ◽  
Aided Design

Exchanging computer-aided design (CAD) model data among heterogeneous CAD systems is indispensable for collaborative product development. Currently, the industry mainly uses the standardized neutral files-based methods to implement such exchange. While at the same time, the application of web ontology language (OWL) file and underlying semantic web technologies in CAD model data exchange is gaining importance and popularity within the academia. The coexistence of different types of methods has generated a series of controversies and questions within the industry and the academia. Yet, can the neutral files-based exchange methods completely implement model data exchange among heterogeneous CAD systems? What challenges have been addressed to date by the developed CAD model data exchange standards? Why OWL has been introduced to CAD model data exchange? Does CAD model data exchange really need OWL? Are there any issues in existing neutral files-based exchange methods and OWL file-based exchange methods need to be addressed in future studies? This paper proposes to conduct a study of the standardized neutral files-based exchange methods and OWL file-based exchange methods. An in-depth analysis of the widely used standard for the exchange of product model data (STEP) method and the newly emerging OWL methods is first provided. Then, the paper makes a detailed comparison between these two types of methods based on this analysis. Finally, some issues in the two types of methods that need to be addressed in the future are discussed.

A Grid-Based Secure Product Data Exchange for Cloud-Based Collaborative Design

2020 ◽  
Vol 29 (01n02) ◽  
pp. 2040006
Author(s):  
Yiqi Wu ◽  
Fazhi He ◽  
Yueting Yang
Keyword(s):  
Collaborative Design ◽  
Computer Aided Design ◽  
Data Exchange ◽  
Target System ◽  
Sensitive Information ◽  
Cad Model ◽  
Security Mechanism ◽  
Deformation Method ◽  
Product Data ◽  
Grid Based

As a new design and manufacture paradigm, Cloud-Based Collaborative Design (CBCD) has motivated designers to outsource their product data and design computation onto the cloud service. Despite non-negligible benefits of CBCD, there are potential security threats for the outsourced product data, such as intellectual property, design intentions and private identity, which has become an interest point. This paper presents a novel secure product data exchange (PDE) in the processes of CBCD. Different from general cloud security mechanism, our method is content-based. We first show an outline of the collaborative scenario to describe the architecture of the proposed secure CBCD, in which a security mechanism is combined with the data exchange service to achieve secure PDE. Second, we present a novel grid-based geometric deformation method for the security mechanism with three processes: the original shapes of a source Computer Aided Design (CAD) model can be hidden by deforming the control grid; then the deformed grid can be exchanged to target system where a deformed target CAD model can be reconstructed; at last, the deformed target CAD model can be recovered to the original shape after recovering the deformed grid. Finally, typical CAD model tests demonstrate that our method can keep the sensitive information of source model and also maintain the same level of data exchange error.

Ontology-Based Representation and Verification to Enable Feature Interoperability Between CAD Systems

2011 ◽  
Author(s):  
Sean Tessier ◽  
Yan Wang
Keyword(s):  
Information Integration ◽  
Computer Aided Design ◽  
Data Exchange ◽  
Exchange Process ◽  
Input Parameter ◽  
Heterogeneous Data ◽  
Boundary Representation ◽  
Target System ◽  
Data Interoperability ◽  
Cad Systems

Data interoperability between computer-aided design (CAD) systems remains a major obstacle in the information integration and exchange in a collaborative engineering environment. The standards for CAD data exchange have remained largely restricted to geometric representations, causing the design intent portrayed through construction history, features, parameters, and constraints to be discarded in the exchange process. In this research paper, an ontology-based framework is proposed to allow for the full exchange of semantic feature data. The Ontology Web Language (OWL) is used to represent feature types as well as the concepts and properties that define features, which allows the use of existing ontology reasoning tools to infer new relationships and information between heterogeneous data. Boundary representation (B-Rep) data corresponding to the output of the feature operation is also stored for purposes of feature identification and translation verification. The base ontology and a small feature library are built in OWL, and a combination of OWL and SWRL (Semantic Web Rule Language) rules are developed to allow a feature from an arbitrary source system to be automatically classified and translated into the target system through the use of a reasoner. These rules relate input parameter and reference types to expected B-Rep objects, allowing classification even when feature definitions vary or when little is known about the source system. In cases when the source system is well known, this approach also permits direct translation rules to be implemented. With such a flexible framework, a neutral feature exchange format could be developed.

A New ISO 10303 (STEP) Resource for Modeling Parameterization and Constraints

2004 ◽  
Vol 4 (4) ◽  
pp. 339-351 ◽  
Author(s):  
Michael J. Pratt
Keyword(s):  
Life Cycle ◽  
Product Life Cycle ◽  
3D Models ◽  
Cad Model ◽  
Product Life ◽  
Cad Systems ◽  
International Standard ◽  
Cad Models ◽  
Constraint Information ◽  
Iso 10303

ISO 10303 (STEP) is a standard for the electronic exchange of product life-cycle data. It has been continually expanded by the addition of new capabilities since its first release by ISO in 1994. Until now, the standard has not been capable of exchanging models with parameterization and constraints such as those commonly generated by modern CAD systems. This makes it difficult to modify a model for any purpose following an exchange. However, new STEP resources have been developed to rectify this situation, and the paper reports on the the first of them to reach International Standard status. It provides the capability to associate explicitly represented parameterization and constraint information with CAD models. The primary application areas are in the 2D profiles or sketches that are inherent in many CAD model constructional procedures, in the positioning and orientation of features in 3D models and in the positioning and orientation of assembly components. Other complementary new STEP resources are briefly discussed at the end of the paper.

scholarly journals Automatized Evaluation of Students’ CAD Models

2021 ◽  
Vol 11 (4) ◽  
pp. 145
Author(s):  
Nenad Bojcetic ◽  
Filip Valjak ◽  
Dragan Zezelj ◽  
Tomislav Martinec
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Computer Application ◽  
Test Cases ◽  
Cad Model ◽  
Computer Solution ◽  
3D Cad ◽  
Computer Aided ◽  
Cad Models ◽  
Aided Design

The article describes an attempt to address the automatized evaluation of student three-dimensional (3D) computer-aided design (CAD) models. The driving idea was conceptualized under the restraints of the COVID pandemic, driven by the problem of evaluating a large number of student 3D CAD models. The described computer solution can be implemented using any CAD computer application that supports customization. Test cases showed that the proposed solution was valid and could be used to evaluate many students’ 3D CAD models. The computer solution can also be used to help students to better understand how to create a 3D CAD model, thereby complying with the requirements of particular teachers.

A 3D CAD model input pipeline for REFMUL3 full-wave FDTD 3D simulator

2021 ◽  
Vol 16 (11) ◽  
pp. C11013
Author(s):  
J.M. Santos ◽  
E. Ricardo ◽  
F.J. da Silva ◽  
T. Ribeiro ◽  
S. Heuraux ◽  
...  
Keyword(s):  
Vessel Wall ◽  
Thermal Protection ◽  
Interface Problem ◽  
Cad Model ◽  
Fusion Plasma ◽  
3D Cad ◽  
Full Wave ◽  
Wall Structures ◽  
Design Cycle ◽  
Cad Models

Abstract The use of advanced simulation has become increasingly more important in the planning, design, and assessment phases of future fusion plasma diagnostics, and in the interpretation of experimental data from existing ones. The design cycle of complex reflectometry systems, such as the ones being planned for next generation machines (IDTT and DEMO), relies heavily on the results produced by synthetic diagnostics, used for system performance evaluation and prediction, both crucial in the design process decision making. These synthetic diagnostics need realistic representations of all system components to incorporate the main effects that shape their behavior. Some of the most important elements that are required to be well modelled and integrated in simulations are the wave launcher structures, such as the waveguides, tapers, and antennas, as well as the vessel wall structures and access to the plasma. The latter are of paramount importance and are often neglected in this type of studies. Faithfully modelling them is not an easy task, especially in 3D simulations. The procedure herein proposed consists in using CAD models of a given machine, together with parameterizable models of the launcher, to produce a description suited for Finite Difference Time Domain (FDTD) 3D simulation, combining the capabilities of real-world CAD design with the power of simulation. However, CAD model geometric descriptions are incompatible with the ones used by standard FDTD codes. CAD software usually outputs models in a tessellated mesh while FDTD simulators use Volumetric Pixel (VOXEL) descriptions. To solve this interface problem, we implemented a pipeline to automatically convert complex CAD models of tokamak vessel components and wave launcher structures to the VOXEL input required by REFMUL3, a full wave 3D Maxwell FDTD parallel code. To illustrate the full procedure, a complex reflectometry synthetic diagnostic for IDTT was setup, converted and simulated. This setup includes 3 antennas recessed into the vessel wall, for thermal protection, one for transmission and reception, and two just for reception.

An Automated System for Design for Manufacturability Analysis for Die-Casting

2018 ◽  
Author(s):  
Sunil Kumar ◽  
Jatinder Madan
Keyword(s):  
Die Casting ◽  
Automated System ◽  
Design For Manufacturability ◽  
Design Stage ◽  
Present System ◽  
Cad Model ◽  
Cast Part ◽  
Early Design Stage ◽  
Die Cast ◽  
Cad Models

Design for manufacturing (DFM) is an important concept that helps to incorporate manufacturability considerations at early design stage. Development of automated DFM tools has become important especially when design and manufacturing are being done by different teams often distantly located. An automated system for design for manufacturability analysis for die-cast parts has been presented in this paper. The paper discusses: (i) knowledgebase of DFM guidelines (ii) die casting feature extraction from part CAD model, and (iii) automated system for DFM analysis and model updation of the die-cast part CAD model. The capabilities of the system are demonstrated by applying it on die cast part CAD models. The results have been validated with the industrial experts. The present system works with CAD models having features such as boss, rib, hole and draft, created using feature based modeling.

Linking Expert Group Technology With Parametric Design

1994 ◽  
Author(s):  
Joon Seok Lee ◽  
Kang J. Chang ◽  
Larry Lichten
Keyword(s):  
Expert Systems ◽  
Group Technology ◽  
Parametric Design ◽  
Geometric Features ◽  
Expert Group ◽  
Cad Systems ◽  
Manual Intervention ◽  
Cad Cam ◽  
Cad Models ◽  
Cam Systems

Abstract Expert systems can be integrated with databases and CAD/CAM systems using group technology (GT). By using information in a database, geometric features of parts can be specified by GT codes, and CAD models can be generated automatically using parameterized generic templates. This paper describes a microcomputer-based prototype implementation that merges database, expert, and CAD systems in order to perform GT classification and create CAD models with minimal manual intervention.

An Engineering Product Model Based on STEP Protocols

1994 ◽  
Vol 10 (04) ◽  
pp. 281-296
Author(s):  
James T. Higney ◽  
Joanne J. Ouillette
Keyword(s):  
Information Content ◽  
Computer Aided Design ◽  
Data Exchange ◽  
Digital Data ◽  
Product Model ◽  
Engineering Product ◽  
Significant Step ◽  
Cad Models ◽  
Application Protocols ◽  
Graphic Database

Draft STEP (Standard for the Exchange of Product Model Data) application protocols, developed by the Navy Industry Digital Data Exchange Standards Committee (NIDDESC), have been issued to define the information content of a product model for a ship. The work reported in this paper combines the existing CAD models of the DDG51 Class design with a newly developed non-graphic database so that the overall information content complies with the STEP protocols. This work represents the first-time implementation of the application protocols and is a significant step in the Navy's plan to do the design of variants of the DDG51 Class totally in computer-aided design (CAD). The combined graphic/non-graphic database is referred to as the DDG51 engineering product model. Emphasis has been placed on populating the non-graphic database with the information necessary to perform all required engineering analyses. The basic schema described in this paper may be extended to support other areas of interest, such as logistics support.

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