scholarly journals RATIONAL CHOICE OF MACHINING TOOLS USING PREDICTION PROCEDURES

2018 ◽  
Vol 4 ◽  
pp. 14-20 ◽  
Author(s):  
Oleg Krol ◽  
Volodymyr Sokolov
Keyword(s):  
Computer Aided Design ◽  
Metal Cutting ◽  
Selection Process ◽  
Information Source ◽  
Prediction Method ◽  
3D Models ◽  
General Definition ◽  
Static Data ◽  
Graph Tree ◽  
Aided Design

Introducing the methods and procedures for predictive analysis into the design process contours of a variety of machining tools (MT) of metal cutting machines is the main aim of this article. A sequence of realization of prediction object (PO) choice as an initial stage of search of perspective designs is offered. Effective in this regard is the "Tree of objectives" apparatus, on the basis of which many ways of improving MT are formed, selecting progressive (reducing the dimension of the problem) at each level of the hierarchy of the constructed graph-tree. The procedure for selecting the prediction method (PM) as a means of generating the forecast data is developed. The task of choosing a method is structured in detail and uses "Information supply"as the main criterion. To this end, assessment scales of choice criteria have been formed, on the basis of which it is possible to evaluate their effectiveness for the PM selection process. The rules forPOcoding are introduced by a three-element information code, including information source classes – static data, expert estimates and patent data. The process of forecasting the MT components by the method of engineering forecasting on the basis of a representative patent fund is realized. The General Definition Table has been built (GDT "Machining tools") and estimates of the prospects of design solutions have been obtained. A fragment of the database of 3D models of promising MT designs in the integrated computer-aided design KOMPAS-3D is proposed.

scholarly journals 3D Compression: from A to Zip a first complete example

2008 ◽  
Vol 15 (1) ◽  
pp. 9-38
Author(s):  
Thomas Lewiner
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
3D Models ◽  
Data Representation ◽  
Specific Class ◽  
Physical Simulations ◽  
Image Creation ◽  
Multidimensional Objects ◽  
Aided Design ◽  
Fast Access

Images invaded most of contemporary publications and communications. This expansion has accelerated with the development of efficient schemes dedicated to image compression. Nowadays, the image creation process relies on multidimensional objects generated from computer aided design, physical simulations, data representation or optimisation problem solutions. This variety of sources motivates the design of compression schemes adapted to specific class of models. The recent launch of Google Sketch’up and its 3D models warehouse has accelerated the shift from two-dimensional images to three-dimensional ones. However, these kind of systems require fast access to eventually huge models, which is possible only through the use of efficient compression schemes. This work is part of a tutorial given at the XXth Brazilian Symposium on Computer Graphics and Image Processing (Sibgrapi 2007).

scholarly journals FROM OSS CAD TO BIM FOR CULTURAL HERITAGE DIGITAL REPRESENTATION

2017 ◽  
Vol XLII-2/W3 ◽  
pp. 439-445 ◽  
Author(s):  
S. Logothetis ◽  
E. Karachaliou ◽  
E. Stylianidis
Keyword(s):  
Cultural Heritage ◽  
Open Source ◽  
Open Source Software ◽  
Computer Aided Design ◽  
3D Models ◽  
Building Information Modelling ◽  
Information Modelling ◽  
Digital Representations ◽  
Building Information ◽  
Aided Design

The paper illustrates the use of open source Computer-aided design (CAD) environments in order to develop Building Information Modelling (BIM) tools able to manage 3D models in the field of cultural heritage. Nowadays, the development of Free and Open Source Software (FOSS) has been rapidly growing and their use tends to be consolidated. Although BIM technology is widely known and used, there is a lack of integrated open source platforms able to support all stages of Historic Building Information Modelling (HBIM) processes. The present research aims to use a FOSS CAD environment in order to develop BIM plug-ins which will be able to import and edit digital representations of cultural heritage models derived by photogrammetric methods.

scholarly journals The krushchkevka and the dom kultura: urban lifestyles in a rural setting

2019 ◽  
Vol 63 ◽  
pp. 08001 ◽  
Author(s):  
Oksana Zhukova ◽  
Simon Bell
Keyword(s):  
Soviet Union ◽  
Computer Aided Design ◽  
First Generation ◽  
3D Models ◽  
Rural Setting ◽  
Soviet Regime ◽  
Urban Forms ◽  
The Soviet Union ◽  
The Baltic ◽  
Aided Design

Collectivisation in the Soviet Union, including the Baltic States, involved many aspects related to living conditions and architecture. One of the dominant images of village centres in Estonia and Latvia is that of the standardised urban forms of blocks of flats and other buildings such as schools and administrative buildings. On collectivisation, new village centres arose, promising “Urban lifestyles in a rural setting”. There are very few designs for blocks of flats – standardisation came in with Krushchev and the first generation of flats built of white brick became known as Krushchevki. Alongside these were buildings to serve as places where the new Soviet cultural activities could take place – the Dom Kultura which, in contrast to the standard flats, was often of a special one-off design. These can often be found to be abandoned and derelict nowadays, since they have no function and represented the Soviet regime. The objective of this study was to examine the plans and initial proposals for several kolkhoz centres and, using computer aided-design, to recreate 3D models of the building ensemble as it was originally planned, to compare this to what was actually built and to what remains now and the extent to which they are still used. We found that while the standard flats were built according to plan, external landscape features were often omitted. The unique designs of the culture houses often contained many interesting Modernist or even post-modernist features but changed during construction and were often built of poor materials and finishes. They were vandalised, robbed of materials and are now abandoned in many cases. Their architects often went on to make a post-Soviet career and there is considerable interest in their designs. They represent a lost legacy of the period.

scholarly journals Modelling Antiquity. Surveying the Private Areas of the Episcopal Palace, Side. Turkey

2019 ◽  
Vol 5 (1) ◽  
pp. 396-415
Author(s):  
Moisés Hernández Cordero ◽  
Andreas Pülz
Keyword(s):  
Computer Aided Design ◽  
Maximum Level ◽  
3D Models ◽  
Digital Elevation ◽  
Ancient City ◽  
Global Positioning ◽  
Gis Environment ◽  
Aided Design ◽  
New Hypothesis ◽  
Data Acquisition Process

AbstractThe use of digital techniques is often applied today by archaeologists in the field to get quick and reliable 3D surveys for their research. 3D models and reconstructions are the focus for the use of these techniques. The aim of this paper is to present the methodology employed during the 2018 season, and its combination with that from 2016 on the private areas of the bishop’s residence of the Episcopal Palace in the ancient city of Side, Turkey. This paper will focus on the data acquisition process, accuracy of the survey, errors and solutions as well as the workflow-process of the data. The aim is to present a useful workflow to combine surveys at a maximum level of accuracy with already completed surveys. A Total Station (TS) survey, Global Positioning System (GPS) Real Time Kinetics (RTK) survey and Structure from Motion (SfM) are among the techniques used to compile the information later exported into a Computer Aided Design (CAD) and Geographic Information System (GIS) environment. Eventually, viable applications of the data created with such methods that help to formulate a new hypothesis for the ritual and non-ritual areas will be shown: plans, 3D models, digital elevation models (DEM) and orthophotos.

scholarly journals Problems of Creation and Usage of 3D Model of Structures and Theirs Possible Solution

Symmetry ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 181 ◽  
Author(s):  
Dalibor Bartonek ◽  
Michal Buday
Keyword(s):  
Computer Aided Design ◽  
3D Model ◽  
Three Dimensional ◽  
3D Models ◽  
Cad System ◽  
Building Models ◽  
Special Cad ◽  
Aided Design ◽  
The Church

This article describes problems that occur when creating three-dimensional (3D) building models. The first problem is geometric accuracy; the next is the quality of visualization of the resulting model. The main cause of this situation is that current Computer-Aided Design (CAD) software does not have sufficient means to precision mapping the measured data of a given object in field. Therefore the process of 3D model creation is mainly a relatively high proportion of manual work when connecting individual points, approximating curves and surfaces, or laying textures on surfaces. In some cases, it is necessary to generalize the model in the CAD system, which degrades the accuracy and quality of field data. The article analyzes these problems and then recommends several variants for their solution. There are described two basic methods: using topological codes in the list of coordinates points and creating new special CAD features while using Python scripts. These problems are demonstrated on examples of 3D models in practice. These are mainly historical buildings in different locations and different designs (brick or wooden structures). These are four sacral buildings in the Czech Republic (CR): the church of saints Johns of Brno-Bystrc, the Church of St. Paraskiva in Blansko, further the Strejc’s Church in Židlochovice, and Church of St. Peter in Alcantara in Karviná city. All of the buildings were geodetically surveyed by terrestrial method while using total station. The 3D model was created in both cases in the program AUTOCAD v. 18 and MicroStation.

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.

scholarly journals Initial Experience Using 3-Dimensional Printed Models for Head and Neck Reconstruction in Haiti

2020 ◽  
pp. 014556132093892
Author(s):  
Swar Vimawala ◽  
Terry Gao ◽  
Jared Goldfarb ◽  
Dominick Gadaleta ◽  
Bon Ku ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
3D Models ◽  
Anatomic Reconstruction ◽  
Head And Neck Reconstruction ◽  
3 Dimensional ◽  
Resource Limited ◽  
Patient Consent ◽  
Computer Aided ◽  
Aided Design ◽  
Complex Surgery

This report describes the first use of a novel workflow for in-house computer-aided design (CAD) for application in a resource-limited surgical outreach setting. Preoperative computed tomography imaging obtained locally in Haiti was used to produce rapid-prototyped 3-dimensional (3D) mandibular models for 2 patients with large ameloblastomas. Models were used for patient consent, surgical education, and surgical planning. Computer-aided design and 3D models have the potential to significantly aid the process of complex surgery in the outreach setting by aiding in surgical consent and education, in addition to expected surgical applications of improved anatomic reconstruction.

Vulnerability prediction method for use in aircraft conceptual design

1999 ◽  
Vol 103 (1024) ◽  
pp. 309-315 ◽  
Author(s):  
S. Al-Ahmed ◽  
J. P. Fielding
Keyword(s):  
Computer Aided Design ◽  
Prediction Method ◽  
Preliminary Design ◽  
Solid Modelling ◽  
Design Synthesis ◽  
Cad System ◽  
Vulnerability Assessments ◽  
Critical Components ◽  
Aided Design ◽  
Aircraft Conceptual Design

Abstract A methodology has been developed to integrate the vulnerability discipline into the conceptual/preliminary design process of combat aircraft. An interactive and programmable solid modelling Computer Aided Design (CAD) system is used to generate a CAD solid model of the aircraft’s critical components. The aircraft’s components’ sizes and shapes are pre-defined by a conceptual/preliminary design synthesis computer model. A systematic Child-Parent assembly process is used to model the aircraft vulnerability, by defining the criticality degree of each component in the aircraft assembly. Solid Modelling CAD techniques have been modified to develop techniques to perform the two main standard vulnerability assessments, namely the shotline and vulnerable area methods.

Cataloging the 3D web: the availability of educational 3D models on the internet

2016 ◽  
Vol 34 (2) ◽  
pp. 239-258 ◽  
Author(s):  
Michael Groenendyk
Keyword(s):  
Computer Aided Design ◽  
3D Model ◽  
3D Models ◽  
3D Modelling ◽  
The Internet ◽  
Content Type ◽  
3D Printers ◽  
3D Printed ◽  
The Subject ◽  
Aided Design

Purpose – The number of 3D models available on the internet to both students and educators is rapidly expanding. Not only are the 3D model collections of popular websites like Thingiverse.com growing, organizations such as the Smithsonian Institution and NASA have also recently begun to build collections of 3D models and make these openly accessible online. Yet, even with increased interest in 3D printing and 3D scanning technologies, little is known about the overall structure of the 3D models available on the internet. The paper aims to discuss this issue. Design/methodology/approach – To initiate this project, a list was built of 33 of the most widely used 3D model websites on the internet. Freely downloadable models, as well as models available for purchase or as 3D printed objects were included in the list. Once the list of 33 websites was created, the data for each individual 3D model in the collections was manually assembled and recorded. The titles of the 3D models, keywords, subject headings, license information, and number of views and downloads were recorded, as this information was available. The data were gathered between January and May 2015, and compiled into a CSV database. To determine how online 3D model content relates to a variety of educational disciplines, relevant subject terms for a variety of educational disciples were extracted from the EBSCO database system. With this list of subject terms in hand, the keywords in the CSV database of model information were searched for each of the subject terms, with an automated process using a Perl script. Findings – There have been many teachers, professors, librarians and students who have purchased 3D printers with little or no 3D modelling skills. Without these skills the owners of these 3D printers are entirely reliant on the content created and freely shared by others to make use of their 3D printers. As the data collected for this research paper shows, the vast majority of open 3D model content available online pertains to the professions already well versed in 3D modelling and Computer Aided Design design, such as engineering and architecture. Originality/value – Despite that fact that librarians, teachers and other educators are increasingly using technologies that rely on open 3D model content as educational tools, no research has yet been done to assess the number of 3D models available online and what educational disciplines this content relates to. This paper attempts to fill this gap, providing an overview of the size of this content, the educational disciplines this content relates to and who has so far been responsible for developing this content. This information will be valuable to librarians and teachers currently working with technology such as 3D printers and virtual reality, as well as those considering investing in this technology.

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