Correction to: Feature shape complexity: a new criterion for the simplification of feature-based 3D CAD models

This paper introduces a concept to integrate measurements data into feature-based 3D CAD models. The concept focuses on its application in the measurement of bifurcated sheet metal profiles. For that, an interface to read and import this data into the CAD system is developed. Since the measurement data is stored as a point cloud, further data processing (reverse engineering) is necessary to recreate the work piece shape in the CAD system. If the measured work piece model and the CAD model of the design piece are available, an automated comparison of the defined dimension takes place. The result is a notification in the CAD model indicating which dimension deviates from the target values. Use-cases are elaborated for integrating the concept in the product development process. To implement this concept, an experimental setup is built up consisting of a measurement system and 3D CAD system. The COPRA ProfileScan Desktop is used to measure the profile. Siemens NX 11 is the chosen CAD system. Based on this setup, the concept is validated on a manufactured profile.

Download Full-text

Graph-Based Simplification of Feature-Based Three-Dimensional Computer-Aided Design Models for Preserving Connectivity

Journal of Computing and Information Science in Engineering ◽

10.1115/1.4030748 ◽

2015 ◽

Vol 15 (3) ◽

Cited By ~ 12

Author(s):

Soonjo Kwon ◽

Byung Chul Kim ◽

Duhwan Mun ◽

Soonhung Han

Keyword(s):

Computer Aided Design ◽

Three Dimensional ◽

Evaluation Metrics ◽

Prototype System ◽

Cad Model ◽

3D Cad ◽

Computer Aided ◽

Cad Models ◽

Feature Based ◽

Aided Design

The required level of detail (LOD) of a three-dimensional computer-aided design (3D CAD) model differs according to its purpose. It is therefore important that users are able to simplify a highly complex 3D CAD model and create a low-complexity one. The simplification of a 3D CAD model requires the application of a simplification operation and evaluation metrics for the geometric elements of the 3D CAD model. The evaluation metrics are used to select those elements that should be removed. The simplification operation removes selected elements in order to simplify the 3D CAD model. In this paper, we propose the graph-based simplification of feature-based 3D CAD models using a method that preserves connectivity. First, new evaluation metrics that consider the discrimination priority among several simplification criteria are proposed. Second, a graph-based refined simplification operation that prevents the separation of a feature-based 3D CAD model into multiple volumes is proposed. Finally, we verify the proposed method by implementing a prototype system and performing simplification experiments using feature-based 3D CAD models.

Download Full-text

Reconstructing Polyhedral CAD Models by Recognizing Extrusion Features From Single-View Drawings

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

10.1115/detc2007-35186 ◽

2007 ◽

Author(s):

Yong S. Suh

Keyword(s):

Design Stage ◽

Detailed Design ◽

Single View ◽

3D Cad ◽

Design Changes ◽

Cad Models ◽

Feature Based ◽

Manufacturing Applications ◽

2D Drawing ◽

Design Analyses

At the conceptual product design stage, designers prefer sketching initial design ideas on paper before using more sophisticated 3D CAD systems for their creativity and flexible design changes. At the later detailed design stages, however, precise 3D CAD modeling is a better choice for design analyses and downstream manufacturing applications. For an integrated digital product development, the 2D drawings need to be converted to 3D CAD models manually through some laborious and time-consuming processes. For decades, many researchers have contributed to the studies on reconstructing 3D geometric models from 2D sketches, but few describe constructing parametric feature-based CAD models that are currently widely used in the detailed design stages. In this paper, a procedure for constructing a feature-based 3D CAD model directly from a single-view 2D drawing is presented. The input sketch is assumed to be an exact orthogonal projection of a 3D model viewed at a general orientation. The model geometry is limited such that it can be constructed by a Boolean combination of extrusions of polygonal profiles.

Download Full-text

Automatized Evaluation of Students’ CAD Models

Education Sciences ◽

10.3390/educsci11040145 ◽

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.

Download Full-text

Name matching method using topology merging and splitting history for exchange of feature-based CAD models

Journal of Mechanical Science and Technology ◽

10.1007/s12206-012-0827-3 ◽

2012 ◽

Vol 26 (10) ◽

pp. 3201-3212 ◽

Cited By ~ 9

Author(s):

Sang-Uk Cheon ◽

Duhwan Mun ◽

Soonhung Han ◽

Byung Chul Kim

Keyword(s):

Matching Method ◽

Cad Models ◽

Name Matching ◽

Feature Based

Download Full-text

Contour-based algorithms for generating 3D CAD models from medical images

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-003-1767-y ◽

2003 ◽

Vol -1 (1) ◽

pp. 1-1 ◽

Cited By ~ 2

Author(s):

J. H. Ryu ◽

H. S. Kim ◽

K. H. Lee

Keyword(s):

Medical Images ◽

3D Cad ◽

Cad Models

Download Full-text

Integrating Freeform and Feature-Based Fitting Methods

Volume 1: 30th Design Automation Conference ◽

10.1115/detc2004-57298 ◽

2004 ◽

Author(s):

H. James de St. Germain ◽

David E. Johnson ◽

Elaine Cohen

Keyword(s):

Reverse Engineering ◽

Surface Fitting ◽

General Purpose ◽

Freeform Surface ◽

Domain Expert ◽

Coordinate Measurement ◽

Reverse Engineer ◽

Model Based ◽

Cad Models ◽

Feature Based

Reverse engineering (RE) is the process of defining and instantiating a model based on the measurements taken from an exemplar object. Traditional RE is costly, requiring extensive time from a domain expert using calipers and/or coordinate measurement machines to create new design drawings/CAD models. Increasingly RE is becoming more automated via the use of mechanized sensing devices and general purpose surface fitting software. This work demonstrates the ability to reverse-engineer parts by combining feature-based techniques with freeform surface fitting to produce more accurate and appropriate CAD models than previously possible.

Download Full-text

Automatic Parametric Modeling From Non-Feature Based Designs for Additive Manufacturing

10.1115/detc2021-71900 ◽

2021 ◽

Author(s):

Xinyi Xiao ◽

Byeong-Min Roh

Keyword(s):

Additive Manufacturing ◽

3D Models ◽

Parametric Modeling ◽

Parametric Models ◽

Performance Simulation ◽

Cad Modeling ◽

3D Cad ◽

Feature Based ◽

And Performance ◽

The Given

Abstract The integration of Topology optimization (TO) and Generative Design (GD) with additive manufacturing (AM) is becoming advent methods to lightweight parts while maintaining performance under the same loading conditions. However, these models from TO or GD are not in a form that they can be easily edited in a 3D CAD modeling system. These geometries are generally in a form with no surface/plane information, thus having non-editable features. Direct fabricate these non-feature-based designs and their inherent characteristics would lead to non-desired part qualities in terms of shape, GD&T, and mechanical properties. Current commercial software always requires a significant amount of manual work by experienced CAD users to generate a feature-based CAD model from non-feature-based designs for AM and performance simulation. This paper presents fully automated shaping algorithms for building parametric feature-based 3D models from non-feature-based designs for AM. Starting from automatically decomposing the given geometry into “formable” volumes, which is defined as a sweeping feature in the CAD modeling system, each decomposed volume will be described with 2D profiles and sweeping directions for modeling. The Boolean of modeled components will be the final parametric shape. The volumetric difference between the final parametric form and the original geometry is also provided to prove the effectiveness and efficiency of this automatic shaping methodology. Besides, the performance of the parametric models is being simulated to testify the functionality.

Download Full-text