Automatic Identification of Features from CAD Models Based on STL Files

2012 ◽  
Vol 220-223 ◽  
pp. 2524-2527
Author(s):  
Li Li Huang ◽  
Xiang Wei Zhang
Keyword(s):  
Data File ◽  
Automatic Identification ◽  
Stl File ◽  
Solid Models ◽  
The Face ◽  
Cad Models ◽  
Geometrical Data ◽  
Technical Issues ◽  
Moving Simulation ◽  
Edge Based

Accessing CAD geometry for mesh generation is one of the major technical issues related to moving simulation forward. This paper studies the automatic identification of features from CAD models based on STL files. The STL file generated with the well-known CAD software UG is used to transfer the surface geometrical data information. A new STL data file with topological connection is constructed for the calculation in the next. The geometric characters of the solid models are correctly identified by combining the edge-based method and the face-based method. It provides a foundation for precise matching of the element meshes to the boundaries of the solid model and improving the mesh quality.

Manufacturing of Cardiac Models Through Rapid Prototyping Technology for Surgery Planning

2006 ◽  
Vol 505-507 ◽  
pp. 1063-1068 ◽  
Author(s):  
Yih Lin Cheng ◽  
Shyh Jye Chen
Keyword(s):  
Cardiac Surgery ◽  
Rapid Prototyping ◽  
Image Data ◽  
Surgery Planning ◽  
Design Concepts ◽  
Stl File ◽  
Medical Software ◽  
Solid Models ◽  
Cad Models ◽  
Cardiac Models

Rapid Prototyping (RP) Technology is capable of fabricating 3D freeform solid models from CAD models and has been widely used in communicating design concepts. Due to its distinctive characteristics, RP is very suitable in aiding surgery planning. Typical medical software used to display cardiac images can delineate both inner and outer structure but its images are virtual. Therefore, solid cardiac models made by RP technology provide a touchable reality to compensate for this deficiency. In this research, RP technology is utilized to assist cardiac surgery planning. CT-scanned image data were first processed to obtain RP-acceptable STL file format, and then solid cardiac models were constructed by Objet QuadraTempo, a commercial RP system made in Israel. These models proved extremely helpful in cardiac surgery planning. In addition, several commercial RP systems are compared by their process capabilities for cardiac surgery planning application.

Integrating Design Process Knowledge With CAD Models

2001 ◽  
Author(s):  
Erik E. Hayes ◽  
William C. Regli
Keyword(s):  
Design Process ◽  
Computer Aided Design ◽  
Search Space ◽  
Temporal Changes ◽  
Boundary Representation ◽  
Process Knowledge ◽  
Solid Models ◽  
Design And Manufacturing ◽  
Cad Models ◽  
Manufacturing Problems

Abstract Solid models are static entities, often defined by boundary representation models as sets of enclosing surfaces. Constructive Solid Geometry and feature-based computer-aided design environments create procedural descriptions of 3D objects in forms of history or CSG trees. These representations are temporally fixed, i.e., they describe the state of an object at a point in time. This paper describes a method to represent and capture temporal evolution of solid models — what we call model process history. We define process history to be all states of a model — the search space of design process. This paper presents a representational formalism we call model process graphs (MPGs). We use MPGs to integrate a model’s description with a model of temporal changes that occur during the design process. We believe that MPG representations can have valuable application for many design and manufacturing problems. The paper describes our preliminary results to use MPGs to (1) create a record of design process; (2) store process-based design rationale; (3) represent in-process shapes for machined artifacts. We anticipate that similar structures will find application in other design and manufacturing problems where important process knowledge is embodied by temporal changes occurring in model evolution.

Automatic Generation of Product Family Member CAD Models Supported by a Platform Using a Template Approach

2002 ◽  
Author(s):  
Zahed Siddique ◽  
Yanjiang Zhou
Keyword(s):  
Family Member ◽  
Parametric Design ◽  
Product Family ◽  
Automatic Generation ◽  
Entire Family ◽  
Analysis And Evaluation ◽  
Evaluation Of Performance ◽  
Solid Models ◽  
Cad Models

Current global markets are volatile, where companies are striving to deliver greater quality, more customization, faster response, more innovative designs and lower prices. New models need to be introduced in the market more frequently, which has given momentum for designing family of products. Development of family of Products using a platform approach requires making decisions regarding platform selection and trade-off studies, which require analysis and evaluation of performance for the entire family instead of an individual products. One of the first steps in performing these activities require development of solid models for the entire family quickly and automatically as platform and family member configurations and size are changed. This paper presents an approach to automatically generate CAD models for a family of products. In the approach, a product family template that integrates configuration and parametric design information is presented. The template is implemented in the developed Product Family CAD (PF-CAD) module for Pro/E. A coffeemaker product family is used as a case study to automatically generate solid models of product family members from customer input.

Optimum 3D Rapping of CAD Models Using Single NURBS

2014 ◽  
Author(s):  
Mohamed A. El-Komy ◽  
Sayed M. Metwalli
Keyword(s):  
Corner Point ◽  
Basis Functions ◽  
Control Points ◽  
Nurbs Curve ◽  
B Splines ◽  
Full Control ◽  
Solid Models ◽  
Cad Models ◽  
3D Solid ◽  
Number Of Segments

Non-Uniform Rational B-Splines (NURBS) can represent curves and surfaces of any degree. Usually in the same curve, however, the degree is unique. The goal of this work is to identify single and exact corner point of lines represented by cubic or other NURBS. The combination of arcs and lines can then be represented by one NURBS with error not to exceed (10−12). The developed procedure can represent any NURBS curve and surface of any degree with full control on all parameters, control points, weights, knot vectors, and number of segments representing the curve or surface, in addition to, the basis functions examination. The optimization identifies the parameters and geometry to insure any required level of accuracy to represent singular corner solid models to allow a single cubic or other NURBS representing the whole solid. It is concluded that the singular corner point can be identified with cubic NURBS. Applications to several 3D solid CAD models are used to verify such a technique.

Study on Designing and Dressing of Worm for Grinding Process of Face Gear

2011 ◽  
Vol 86 ◽  
pp. 475-478
Author(s):  
Xiao Zhen Li ◽  
Ru Peng Zhu ◽  
Zheng Min Qing Li ◽  
Fa Jia Li
Keyword(s):  
Gear Tooth ◽  
Tooth Surface ◽  
Grinding Process ◽  
Coordinate Systems ◽  
Face Gear ◽  
Dressing Method ◽  
Solid Models ◽  
The Face ◽  
Relationship Of ◽  
Envelope Theory

In order to process the hardened face-gear, the worm for face-gear is studied. The research includes designing and dressing method of worm. According to the meshing relationship of face-gear, worm and shaper, coordinate systems of face-gear, worm and shaper are established. By envelope theory, the face-gear tooth surface are obtained, worm tooth surface and shaper tooth surface. The solid models of face-gear, worm and shaper were built, and the approach of dressing was simulated for hardened face-gear processed.

scholarly journals Visualising plural mappings of science for Sustainable Development Goals (SDGs)

2021 ◽  
Author(s):  
Ismael Rafols ◽  
Ed Noyons ◽  
Hugo Confraria ◽  
Tommaso Ciarli
Keyword(s):  
Sustainable Development ◽  
Sustainable Development Goals ◽  
The Face ◽  
Technical Issues ◽  
Development Goals ◽  
High Degree ◽  
The Relationship ◽  
Map Of Science ◽  
Beta Version

Analysts are rapidly developing methods to map publications to SDGs in the face of policy demands. However, as reported by Armitage et al. (2020), a high degree of inconsistency is found when comparing the bibliometric corpora obtained with different approaches. These inconsistencies are not due to minor technical issues, but instead they represent different interpretations of SDGs. Given the variety of understandings regarding the relationship between research and SDGs, we propose that bibliometrics analysts should not assume that there is one single, preferred or consensus way of mapping SDGs to publications. We propose instead that, since different stakeholders have contrasting views about the relationships between science and SDGs, the contribution of bibliometrics should be to provide a plural landscape for stakeholders to explore their own views. We describe here the beta-version of an interactive platform that allows stakeholders to scrutinise in a global map of science the clusters potentially related to SDGs.

Shape Comparison of 3D Models Based on Features and Parameters

2008 ◽  
Author(s):  
Karthik Viswanathan ◽  
Sagar Chowdhury ◽  
Zahed Siddique
Keyword(s):  
Computer Aided Design ◽  
Product Family ◽  
3D Models ◽  
3D Cad ◽  
Solid Models ◽  
Cad Models ◽  
3D Solid ◽  
Aided Design ◽  
Distinct Features ◽  
Common Platform

Computer-Aided Design (CAD) is used extensively during mechanical product design, which involves creating 3D models of components and then assembling them into modules and systems. Methods and tools to compare components and identify a common platform using these 3D CAD models of components would facilitate faster specification of product family architecture. Hence, there is a need to develop means for comparing component geometry, in order to identify the common and distinct features, determine component commonality, and identify a common platform for the set of components. This paper presents an approach to determine geometric commonality between components from their 3D solid models. The approach consists of performing a pair-wise comparison between components. To measure commonality for a pair of components, first all feature-pair’s dimensions and positions are measured, which then combined to give the overall component-pair commonality.

AIS The Cornerstone of National Security?

2003 ◽  
Vol 56 (1) ◽  
pp. 31-44 ◽  
Author(s):  
Jay A. Creech ◽  
Joseph F. Ryan
Keyword(s):  
National Security ◽  
Coast Guard ◽  
International Maritime Organization ◽  
Automatic Identification ◽  
Identification System ◽  
Automatic Identification System ◽  
The Us ◽  
Pros And Cons ◽  
Technical Issues ◽  
Maritime Domain Awareness

The International Maritime Organization has mandated carriage requirements for VHF Automatic Identification System (AIS) on vessels over 300 tons by 2007 (IMO SOLAS: 1974 and IMO Resolution MSC.99(73)). The AIS will transmit a vessel's position and voyage data to other AIS-equipped vessels and shore-based authorities. It was envisioned that AIS data could enhance the safety of navigation by allowing vessels to quickly identify each other and use Digital Select Calling (DSC) to arrange maneuvers. We will discuss the history and the development of AIS, the technical issues surrounding its use by the mariner as a navigation tool and the pros and cons of the proposal by the US Coast Guard (USCG) to use AIS as a means of surveillance for Maritime Domain Awareness.

The Application of Biometric Identification Technology in ATM System

2013 ◽  
Vol 347-350 ◽  
pp. 3419-3421
Author(s):  
Ming Hui Zhang ◽  
Yao Yu Zhang
Keyword(s):  
Face Recognition ◽  
Second Generation ◽  
Fingerprint Recognition ◽  
Biometric Identification ◽  
Automatic Identification ◽  
Behavioral Characteristics ◽  
Automatic Teller Machine ◽  
Biological Recognition ◽  
The Face ◽  
Bank System

Biometric identification technology deals with the identification of individuals based on their biological or human behavioral characteristics. Biometric identification method is reliable, anti-counterfeit, convenient and safe. At present there are some insecurity factors in the ATM (automatic teller machine) in bank system. Methods such as combining biological recognition with the ATM machine, adding the face recognition technology, fingerprint recognition, second generation ID card recognition, enhancing automatic identification are developed to improve the security of ATM.

Inverting line drawings of faces 1This manuscript was started in Stirling when the first author was staying there with a research Grant from the Swiss National Fond. We want to thank Alexia Knüsel and Anne Zbinden for their help in data collection and Adrian von Mühlenen who allowed to publish his face to illustrate the stimulus material. Moreover, we thank two anonymous reviewers for their comments.

2000 ◽  
Vol 59 (3) ◽  
pp. 159-169 ◽  
Author(s):  
Helmut Leder ◽  
Vicki Bruce
Keyword(s):  
Face Processing ◽  
General Pattern ◽  
Line Drawing ◽  
Short Term ◽  
Line Drawings ◽  
Configural Information ◽  
The Face ◽  
Edge Based ◽  
Sequential Matching ◽  
Research Grant

Two conditions which both disrupt faces processing, inversion and the transformation of the face into an edge-based line drawing, have each been explained at least partially in terms of a disruption of configural information. Five experiments are reported in which the combined effects of the two manipulations were investigated, to find out how the combination of both affects face processing. Moreover, two different tasks were used: sequential matching of person identity and free identification. The general pattern of result revealed that in both tasks effects of both manipulations are rather additive and thus it is concluded that both manipulations are disruptive through different sorts of information processing. It is discussed how at least two different kinds of configural information are involved in face processing. The comparison of the two tasks, identification and sequential matching, indicates that identification is the more critical condition as it cannot be based on inferences that are probably due to short-term representations of critical features - although both tasks reveal similar results.

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