Interoperability, Shape Representation, and Geometric Processing for Network-Enabled Virtual Prototyping

2000 ◽  
Author(s):  
Jae Yeol Lee ◽  
Joo-Haeng Lee ◽  
Hyun Kim ◽  
Sung-Bae Han
Keyword(s):  
Shape Representation ◽  
Virtual Prototyping ◽  
3D Models ◽  
Internet Technology ◽  
Global Network ◽  
Design Environment ◽  
Modeling And Analysis ◽  
Assembly Modeling ◽  
Cad Models ◽  
Geometric Processing

Abstract Internet technology opens up another domain for building future CAD/CAM environment. The environment will be global, network-centric, and spatially distributed. In this paper, we present a new approach to network-centric virtual prototyping (NetVP) in a distributed design environment. The presented approach combines the current virtual assembly modeling and analysis technique with distributed computing and communication technology for supporting virtual prototyping activities over the network. This paper focuses on interoperability, shape representation, and geometric processing for distributed virtual prototyping. STEP standard and CORBA-based interfaces allow the bi-directional communication between the CAD model and virtual prototyping model, which makes it possible to solve the problems of interoperability, heterogeneity of platforms, and data sharing. STEP AP203 is utilized as a means of transferring and sharing product models. In addition, Attributed Abstracted B-rep (AAB) is introduced as 3D shape abstraction for transparent and efficient transmission of 3D models and for the maintenance of naming consistency between CAD models and virtual prototyping models over the network. Further, this paper discusses geometric processings needed for distributed virtual prototyping activities such as collision detection and interactive assembly modeling.

Web-Enabled Feature-Based Modeling in a Distributed Design Environment

1999 ◽  
Author(s):  
Jae Yeol Lee ◽  
Hyun Kim ◽  
Sung-Bae Han
Keyword(s):  
Collaborative Design ◽  
Feature Modeling ◽  
Feature Model ◽  
Internet Technology ◽  
Global Network ◽  
Dynamic Feature ◽  
Distributed Design ◽  
Product Modeling ◽  
Design Environment ◽  
Feature Based

Abstract Network and Internet technology open up another domain for building future CAD/CAM environments. The environment will be global, network-centric, and spatially distributed. In this paper, we present Web-enabled feature-based modeling in a distributed design environment. The presented approach combines the current feature-based modeling technique with distributed computing and communication technology for supporting product modeling and collaborative design activities over the network. The approach is implemented in a client/server architecture, in which Web-enabled feature modeling clients, neutral feature model server, and other applications communicate with one another via a standard communication protocol. The paper discusses how the neutral feature model supports multiple views and maintains naming consistency between geometric entities of the server and clients as the user edits the part in a client. Moreover, it explains how to minimize the network delay between the server and client according to dynamic feature modeling operations.

Integration and evaluation of haptic feedbacks: from CAD models to virtual prototyping

2010 ◽  
Vol 4 (2) ◽  
pp. 87-94 ◽  
Author(s):  
Damien Chamaret ◽  
Sehat Ullah ◽  
Paul Richard ◽  
Mickael Naud
Keyword(s):  
Virtual Prototyping ◽  
Cad Models

Web-Based Cad Tools for a Networked Manufacturing Service

1998 ◽  
Author(s):  
Fu-Chung F. Wang ◽  
Paul K. Wright
Keyword(s):  
New Product Development ◽  
Design Tool ◽  
Internet Technology ◽  
Machining Process ◽  
Global Network ◽  
The Internet ◽  
Distributed Design ◽  
Cad Tools ◽  
Web Based ◽  
Design And Manufacturing

Abstract New techniques in Information Technology are now changing not only our daily life, but also the professional practice of product design and manufacturing for new product development. Internet technology in particular opens up another domain for building future CAD/CAM environments. This environment will be a global, network-centric environment with various members providing different software tools, manufacturing facilities, and analysis services for distributed design and fabrication. In this paper, we first briefly describe a vision and current development in a distributed design and manufacturing environment. The paper then emphasizes how current CAD tools will evolve to facilitate the distributed design and fabrication process. In particular, the development of a set of Web-based design tools for fabricating parts using a machining process via the Internet is presented. Experiments on machining 2-1/2 D and freeform parts through this Java-based design tool have shown the feasibility for a networked machining service via the Internet.

The Principle and Process of Digital Fabrication of Biomedical Objects

2018 ◽  
pp. 505-520
Author(s):  
S. H. Choi ◽  
H. H. Cheung ◽  
W. K. Zhu
Keyword(s):  
Virtual Reality ◽  
Biomedical Engineering ◽  
Virtual Prototyping ◽  
Digital Fabrication ◽  
Manufacturing Processes ◽  
Body Parts ◽  
Human Organs ◽  
Cad Models ◽  
Traditional Manufacturing ◽  
Bone Structures

Biomedical objects are used as prostheses to repair damaged bone structures and missing body parts, as well as to study complex human organs and plan surgical procedures. They are, however, not economical to make by traditional manufacturing processes. Researchers have therefore explored the multi-material layered manufacturing (MMLM) technology to fabricate biomedical objects from CAD models. Yet, current MMLM systems remain experimental with limited practicality; they are slow, expensive, and can only handle small, simple objects. To address these limitations, this chapter presents the multi-material virtual prototyping (MMVP) technology for digital fabrication of complex biomedical objects cost-effectively. MMVP integrates MMLM with virtual reality to fabricate biomedical objects for stereoscopic visualisation and analyses to serve biomedical engineering purposes. This chapter describes the principle of MMVP and the processes of digital fabrication of biomedical objects. Case studies are presented to demonstrate these processes and their applications in biomedical engineering.

Performance of 3D computers and 3D printed models as a fundamental means for spatial engineering information visualization

2014 ◽  
Vol 41 (10) ◽  
pp. 869-877 ◽  
Author(s):  
Gabriel B. Dadi ◽  
Timothy R.B. Taylor ◽  
Paul M. Goodrum ◽  
William F. Maloney
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
3D Models ◽  
The Body ◽  
Information Modeling ◽  
Simple Task ◽  
Great Opportunity ◽  
Cad Models ◽  
Engineering Information ◽  
3D Printed

Engineering information delivery can be a source of inefficient communication of design, leading to construction rework and lower worker morale. Due to errors, omissions, and misinterpretations, there remains a great opportunity to improve the traditional documentation of engineering information that craft professionals use to complete their work. Historically, physical three dimensional (3D) models built by hand provided 3D physical representations of the project to assist in sequencing, visualization, and planning of critical construction activities. This practice has greatly diminished since the adoption of 3D computer-aided design (CAD) and building information modeling technologies. Recently, additive manufacturing (a.k.a. 3D printing) technologies have allowed for three dimensional printing of 3D CAD models. A cognitive experiment was established to measure the effectiveness of 2D drawings, a 3D computer model, and a 3D printed model in delivering engineering information to an end-user are scientifically measured. The 3D printed model outperformed the 2D drawings and 3D computer interface in productivity measures. This paper’s primary contribution to the body of knowledge is identification of how different mediums of engineering information influence the performance of a simple task execution.

“Thin” vs. “Fat” Client of Web-Based CAD Tools

2000 ◽  
Author(s):  
Charlie C. L. Wang ◽  
Matthew M. F. Yuen ◽  
Yu Wang
Keyword(s):  
Low Cost ◽  
Software Tools ◽  
Internet Technology ◽  
Global Network ◽  
Distributed Design ◽  
Cad Tools ◽  
Web Based ◽  
Thin Client ◽  
Cad Cam ◽  
Cad Tool

Abstract Internet technology in particular opens up another domain for building future CAD/CAM environment. This environment will be a global, network-centric environment with various members providing different software tools, manufacturing facilities, and analysis services for distributed design and fabrication. Web-based CAD tools play a prominent role in the environment. Two kinds of clients can be used to develop a web-based CAD tool now, one is “thin” client, and another is “fat” client. This paper compares the advantage of “thin” and “fat” client, and explains the advantage of using low-cost, configurable, CAD components.

A Dual Environment for 3D Modeling With User-Defined Free Form Features

2007 ◽  
Author(s):  
Thomas R. Langerak ◽  
Joris S. M. Vergeest
Keyword(s):  
Computer Aided Design ◽  
Shape Representation ◽  
Target Surface ◽  
Free Form ◽  
Dynamic Feature ◽  
Cad Models ◽  
Form Features ◽  
Definition Of ◽  
High Level ◽  
Aided Design

Modeling with free form features has become the standard in Computer-Aided Design (CAD). With the increasing complexity of free form CAD models, features offer a high-level approach to modeling shapes. However, in most commercial modeling packages, only a static set of free form features is available. Researchers have tried to solve this problem by coming up with methods for user-driven free form feature definition, but failed to connect their methods to a means to instantiate these user-driven free form features on a target surface. Reversely, researchers have proposed tools for modeling with free form features, but these methods are time-intensive in that they are as of yet unsuitable for pre-defined features. This paper presents a new method for user-driven feature definition, as well as a method to instantiate these user-defined features on a target surface. We propose the concept of a dual environment, in which the definition of a feature is maintained simultaneously with its instance on a target surface, allowing the user to modify the definition of an already instantiated feature. This dual environment enables dynamic feature modeling, in which the user is able to change the definition of instantiated features on-the-fly. Furthermore, the proposed instantiation method is independent from the type of shape representation of the target surface and thereby increases the applicability of the method. The paper includes an extensive application example and discusses the results and shortcomings of the proposed methods.

A Translator for Converting CAD Models to Second Life

2010 ◽  
Author(s):  
Ratnadeep Paul ◽  
Sam Anand
Keyword(s):  
Virtual Worlds ◽  
Second Life ◽  
Product Life Cycle ◽  
Manufacturing Industry ◽  
Product Information ◽  
Life Cycle Management ◽  
3D Models ◽  
Transfer Product ◽  
Cad Models ◽  
Business Entities

Product Life-cycle Management (PLM) has been one of the single most important techniques to have been developed in the manufacturing industry. The increasing capabilities of internet and the ever increasing dependence of business entities on internet have led to the development of metaverses — internet-based 3D virtual worlds — which act as business platforms where companies display and showcase their latest products and services. This is in turn has led to a demand for development of methods for the easy transfer of data from stand alone PLM systems to the internet based virtual worlds. This paper presents the development of a translator which will transfer product data of 3D models created in CAD systems to an internet based virtual world. This translator uses a faceted-surface approach to transfer the product information. In this work CAD models were converted to a CAD-neutral data format, JT file format, and finally recreated in the metaverse Second Life (SL). Examples of models translated from JT to SL have been presented. A technique known as prim optimization, which increases the efficiency of the translation was also incorporated in the algorithm for the translator. Examples of prim optimization have been provided in the paper.

A Design Environment for Performance Modeling and Analysis of Aero Engine Lubrication Systems

2013 ◽  
Author(s):  
Prasath Mahendiran ◽  
Bommaian Balasubramanian ◽  
Muralidhar Manavalan ◽  
Adithya Rao
Keyword(s):  
Performance Modeling ◽  
Failure Modes ◽  
System Modeling ◽  
Simulation Software ◽  
Lubrication System ◽  
Design Environment ◽  
Report Generation ◽  
Modeling And Analysis ◽  
Aero Engine ◽  
Performance Modeling And Analysis

This paper presents the overview and capability of design Environment for performance modeling and analysis of aero engine lubrication systems. The design environment is implemented as an intuitive and easy to use toolbox implemented within the commercial off-the-shelf (COTS) simulation software environment MATLAB/Simulink®. The toolbox consists of a library of predefined reusable/generic lubrication system components like flow resistance elements, pumps and orifice. The component behavior is modeled mathematically using first principles and component characteristics. The developed components have been extensively verified & validated with actual hardware test data covering multiple test points in the flight envelope and also different failure modes of the system. The verification & validation methodology and the results of the component tests, is not the subject of the paper. The aero engine lubrication system is modeled by connecting the components drawn from the library to form a network consisting of nodes and flow paths. The solver implemented computes the unknown pressure and flow values in the lubrication circuit. The design environment has been used to perform steady state performance analysis of aero engine lubrication system. It has additional capability to perform parametric studies, trade studies, design exploration, analyzing simulation results and automated report generation, which will be described in the paper. The flexible software architecture and modular programming techniques has delivered the significant benefit of component models reuse. The generic nature of the toolbox can be exploited to perform system modeling and analysis of any hydraulic system.

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