Modeling and Transfer of Product Model Digital Data for DDG 51 Class Destroyer Program

1991 ◽  
Vol 7 (04) ◽  
pp. 205-219
Author(s):  
William R. Schmidt ◽  
James R. Vander Schaaf ◽  
Richard V. Shields
Keyword(s):  
Computer Model ◽  
Three Dimensional ◽  
Digital Data ◽  
Modeling Technique ◽  
Product Model ◽  
Cooperative Effort ◽  
Product Models ◽  
Cad Cam ◽  
Ongoing Project ◽  
Weapons Systems

The significant benefits achieved by the Navy from application of a CAD/CAM modeling technique to the Aegis Destroyer Construction Program are described. Building a computer model of the ship—the Arleigh Burke Class (DDG 51)—prior to construction reduces interferences and improves design accuracy and completeness. Major challenges addressed by the paper are the translation to CAD of an existing paper design and the transfer of three-dimensional CAD product models in order to permit construction of the ship at two different yards. This ongoing project represents a major cooperative effort between the Navy, design agencies, weapons systems manufacturers, and two private shipyards.

scholarly journals A STEP to Improved CAD

1998 ◽  
Vol 120 (02) ◽  
pp. 84-85 ◽  
Author(s):  
Henry Baumgartner
Keyword(s):  
Product Information ◽  
Open Systems ◽  
Two Dimensional ◽  
Model Data ◽  
Product Model ◽  
Complete Product ◽  
Product Models ◽  
The World ◽  
Cad Cam ◽  
A Company

This article highlights that by using a standard that enables complete product model data to be transmitted digitally, a company can build open systems to make information available on many platforms throughout its operations. The world of CAD/CAM has viewed the International Graphics Exchange Standard (IGES) as its translation standard for years, using the system to move two-dimensional models from one program to another. While IGES does, in fact, do a good job of transmitting basic geometry, another translator—the Standard for the Exchange of Product Data (STEP) —has been gaining on IGES in popularity. STEP goes considerably further than just transmitting geometry; it provides users with the ability to express and exchange digitally useful product information throughout a product's life cycle, including design, analysis, manufacturing, and support. In short, IGES transmits two-dimensional drawings, while STEP transmits complete product models. The updated schema, consisting of an ASCII file written in EXPRESS, is simply run through a utility that merges the extensions that have been added by Unigraphics with the standard ST-Developer libraries. Updating the translator to incorporate an upgraded version of the libraries is just as easy.

Development of an Initial Graphics Exchange Specification Capability

1987 ◽  
Vol 3 (04) ◽  
pp. 264-273
Author(s):  
D. J. Wooley ◽  
M. L. Manix
Keyword(s):  
Data Exchange ◽  
Digital Data ◽  
Product Model ◽  
Design Data ◽  
Data Format ◽  
Computer Data ◽  
Shipbuilding Industry ◽  
Cad Cam ◽  
Working Groups ◽  
Fleet Operations

Industry has long recognized the importance of computerized data exchange. The concept of a neutral exchange format is the key to an efficient and maintainable data exchange capability due to the number of dissimilar CAD/CAM systems in use today. The capability to exchange computerized design data provides the opportunity to eliminate many redundant activities such as recreating computer data from computer-generated paper drawings. The resulting improved communication of design data between contractors, subcontractors, customers, and operation and maintenance activities can reduce costs and upgrade fleet operations. This paper focuses on the need for and the methods used to develop a, workable computerized data exchange capability. Topics of discussion include the merits of electronic data exchange, the limitations of direct translators, and the benefits of a neutral data format. A project is presented that addresses various aspects of digital data exchange within the shipbuilding industry. Emphasis is placed on two working groups that address the digital exchange of design drawings and product model data using the Initial Graphics Exchange Specification (IGES).

scholarly journals Quantitative Model for the Value of the 3D Product Model Use in Production Processes

2021 ◽  
Vol 4 (4) ◽  
pp. 90
Author(s):  
Carl Kirpes ◽  
Dave Sly ◽  
Guiping Hu
Keyword(s):  
Systems Engineering ◽  
Three Dimensional ◽  
Quantitative Model ◽  
Product Model ◽  
Qualitative And Quantitative ◽  
Production Processes ◽  
Product Models

Prior research has shown qualitatively that organizations can increase the value created in their production and assembly processes through the implementation of three-dimensional (3D) product models in those processes. This paper moves beyond qualitative value to develop and calibrate a quantitative model for the value of 3D product model use in production and assembly processes. The principal contributions of this research are development of the quantitative model and determination of the quantitative value of deploying the 3D product model in assembly and production processes; findings developed through interviews with industry experts in industrial and systems engineering to gather the model inputs, calculate the outputs, and then calibrate the model with those industry experts. These results are then compared against the qualitative value categories from prior research to determine the alignment in order and magnitude with the quantitative model results. This paper concludes with a recommendation of where both industry and academia focus future implementation efforts and research based upon the associated results demonstrated in both the qualitative and quantitative model on the value of 3D product model use in assembly and production processes.

scholarly journals DENTAL SCANNERS IN PROSTHODONTICS

2019 ◽  
Vol 31 (4) ◽  
pp. 845-852
Author(s):  
Blagoja Dashtevski ◽  
Aneta Mijoska ◽  
Marjan Petkov ◽  
Vanco Spirov ◽  
Oliver Dimitrovski
Keyword(s):  
Oral Cavity ◽  
Digital Technology ◽  
Three Dimensional ◽  
Spatial Layout ◽  
Dental Restoration ◽  
Digital Data ◽  
Prosthetic Devices ◽  
Scanning Process ◽  
Engineering Sciences ◽  
Cad Cam

As a digital technology enters in every area of everyday life, including the medicine, it begins to increase its influence in dental practice too. The term scanner in dentistry is called a 3-D scanner and refers to an instrument that collects data on the three-dimensional spatial layout and the shape of the tooth and dental structures in the mouth or the model and transforms them into a set of digital data. With the help of the scanner, the anatomic-morphological structures of the oral cavity are recorded or reflected and data are received in digital form.The first stage in the three-part CAD / CAM process of making a prosthetic device-scanning of the anatomic-morphological structures in this process presents the main basis of the future dental restoration. The scanning, as well as the remaining two parts of the CAD / CAM system are taken from the mechanical engineering sciences that incorporate dental doctrines for the production of a prosthetic devices. The dentists who want to use this technology often do not have enough time or sufficient knowledge to understand the current scanning process. The term scanner in dentistry is called a 3-D scanner and refers to an instrument that collects data on the three-dimensional spatial layout and the shape of the tooth and dental structures in the mouth or the model and transforms them into a set of digital data. With the help of the scanner, the anatomic and morphological structures of the oral cavity are recorded or reflected and data are received in digital form. For these reasons, we feel the need to demonstrate the development of the dental scanning process and its methodological procedures to obtain a virtual model. This makes it possible to obtain a complete picture of digital technology and to understand the necessary information about the scanning process that is today in everyday use. The paper presents the basic data that are currently available with the remark that this technology has a rapid development that will contribute to even better results in the manufacture of prosthetic devices.

Selective Laser Melting in Dentistry

2010 ◽  
pp. 111-125 ◽  
Author(s):  
R. Strietzel
Keyword(s):  
Selective Laser Melting ◽  
Three Dimensional ◽  
Digital Data ◽  
Complex Geometries ◽  
Data Sets ◽  
Laser Melting ◽  
Data Set ◽  
First Choice ◽  
Cad Cam ◽  
Frame Work

Although casting is currently the first choice to produce metallic frame work selective laser melting (SLM) has established. Based on a CAD/CAM system the digital data of the frame work are transferred to the production machine. The three dimensional data set of the transferred in to numerous quasi 2-dimensional data. Each of these data sets represents a single slice, which is then produced. Due to the production process complex geometries and outstanding mechanical and chemical properites can be realized. Advantageously is also the large number of simultaneously fabricated parts, which makes this method very economic.

NIDDESC-IGES Developments—Today’s Solution

1994 ◽  
Vol 10 (01) ◽  
pp. 31-38
Author(s):  
Burton Gischner ◽  
Gregory Morea
Keyword(s):  
Department Of Defense ◽  
Data Exchange ◽  
Data Transfer ◽  
Digital Data ◽  
Current Version ◽  
Product Model ◽  
Shipbuilding Industry ◽  
Product Models ◽  
Engineering Drawings ◽  
Application Protocols

The Initial Graphics Exchange Specification (IGES) was first developed in 1980. It has evolved with continual improvements to the current Version 5.1 which was published in October 1991 [1]. Although IGES has proved to be a very valuable tool, difficulties have been encountered in using it for sophisticated transfers, such as for product models or complicated drawings. The long range solution to these difficulties is the emergence of the Standard for the Exchange of Product Model Data (STEP). The Navy/Industry Digital Data Exchange Standards Committee (NIDDESC) has been a leading player in the development of this international standard. However, in the interim, NIDDESC is also spearheading the efforts to enhance the use of IGES by developing application protocols. Two of these application protocols, for 3D Piping and Engineering Drawings, are the first ones to be developed by the IGES/ PDES (Product Data Exchange using STEP) Organization (IPO), and will lead the way to more productive data transfer before the development of STEP. They will be referenced by the U.S. Department of Defense (DOD) standard for digital data transfer, MIL-D-28000 [2], and should greatly facilitate the occurrence of effective data transfer in these two disciplines. Furthermore, the use of these IGES application protocols is expected to provide significant guidance in the development of application protocols for the emerging STEP standard. This paper focuses on the development of these two application protocols, the involvement of NIDDESC and the shipbuilding industry (as well as the participation of other industry users and vendors), and the significant benefits to be derived from the adoption of these standards.

NIDDESC: Meeting the Data Exchange Challenge Through a Cooperative Effort

1990 ◽  
Vol 6 (02) ◽  
pp. 125-137
Author(s):  
John Kloetzli ◽  
Dan Billingsley
Keyword(s):  
Computer Aided Design ◽  
Data Exchange ◽  
Distribution Systems ◽  
Data Transfer ◽  
Digital Data ◽  
Cooperative Effort ◽  
Public And Private ◽  
Product Data ◽  
Marine Industry ◽  
Cad Cam

The application of computer-aided design (CAD) and manufacturing (CAM) techniques in the marine industry has increased significantly in recent years. With more individual designers and shipyards using CAD within their organizations, the pressure to transfer CAD data between organizations has also increased. The Navy/Industry Digital Data Exchange Standards Committee (NIDDESC) provides a mechanism for public and private organizations to cooperate in the development of digital data transfer techniques. Organizationally, NIDDESC is a cost-sharing venture between private firms and government organizations. This effort arose from the Naval Sea Systems Command (NAVSEA) in cooperation with the National Shipbuilding Research Program. The members include leading professionals in the marine industry from several major design firms, private shipyards, naval shipyards, and government laboratories. All members are directly involved in CAD/CAM in their organizations and together represent a broad spectrum of experience and perspectives. NIDDESC has many subcommittees devoted to specific areas of digital data transfer. The basic objective is to develop an industry-wide consensus on product data models for ship structure and distribution systems. Efforts include contributions to the Initial Graphics Exchange Standard, the Product Data Exchange Standard, preparation of a Recommended Practices Manual and the analysis of ship production data flows. NIDDESC has made contributions to the development of CALS standards, including MIL-STD-1840, DOD-IGES, SGML, and MIL-D-28000.

scholarly journals Virtual Surgical Planning, Stereolitographic Models and CAD/CAM Titanium Mesh for Three-Dimensional Reconstruction of Fibula Flap with Iliac Crest Graft and Dental Implants

2021 ◽  
Vol 10 (9) ◽  
pp. 1922
Author(s):  
Carlos Navarro Cuéllar ◽  
Manuel Tousidonis Rial ◽  
Raúl Antúnez-Conde ◽  
Santiago Ochandiano Caicoya ◽  
Ignacio Navarro Cuéllar ◽  
...  
Keyword(s):  
Bone Resorption ◽  
Surgical Planning ◽  
Iliac Crest ◽  
Three Dimensional ◽  
Titanium Mesh ◽  
Iliac Crest Graft ◽  
Virtual Surgical Planning ◽  
Fibula Flap ◽  
Dimensional Reconstruction ◽  
Cad Cam

Mandibular reconstruction with fibula flap shows a 3D discrepancy between the fibula and the remnant mandible. Eight patients underwent three-dimensional reconstruction of the fibula flap with iliac crest graft and dental implants through virtual surgical planning (VSP), stereolitographic models (STL) and CAD/CAM titanium mesh. Vertical ridge augmentation and horizontal dimensions of the fibula, peri-implant bone resorption of the iliac crest graft, implant success rate and functional and aesthetic results were evaluated. Vertical reconstruction ranged from 13.4 mm to 10.1 mm, with an average of 12.22 mm. Iliac crest graft and titanium mesh were able to preserve the width of the fibula, which ranged from 8.9 mm to 11.7 mm, with an average of 10.1 mm. A total of 38 implants were placed in the new mandible, with an average of 4.75 ± 0.4 implants per patient and an osseointegration success rate of 94.7%. Two implants were lost during the osseointegration period (5.3%). Bone resorption was measured as peri-implant bone resorption at the mesial and distal level of each implant, with a variation between 0.5 mm and 2.4 mm, and with a mean of 1.43 mm. All patients were rehabilitated with a fixed implant prosthesis with good aesthetic and functional results.

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