scholarly journals Construction of 3D Wireframe Model in Problem of Converting Paper Drawing and Design Documentation into an Electronic Model of an Object

2020 ◽  
pp. 67-82
Author(s):  
Sergey Romensky ◽  
Sergey Rotkov
Keyword(s):  
Three Dimensional ◽  
Skeleton Model ◽  
Temporal Characteristics ◽  
Application Program ◽  
Electronic Model ◽  
Design Documentation ◽  
Graphic Information ◽  
Wireframe Model

This work is devoted to various stages of the formation of a three-dimensional wireframe model when solving the problem of converting paper drawings into drawing-design documentation. The stages of obtaining geometric-graphic information by an application program and forming a three-dimensional skeleton model are considered in detail. The study of the temporal characteristics of the developed algorithm is also given.

Design of Hydraulic Transmission Bicycle Based on Top-Down Method

2012 ◽  
Vol 468-471 ◽  
pp. 867-870 ◽  
Author(s):  
Yan Hong Yang ◽  
Xiang Qiang Zhong
Keyword(s):  
Rapid Development ◽  
Three Dimensional ◽  
New Product ◽  
Feature Modeling ◽  
Assembly Model ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Top Down ◽  
Skeleton Model ◽  
New Type

Hydraulic transmission bicycle is a new type of vehicle. It is crucial for founding an effective method of rapid development for new product. The concept drafting of hydraulic transmission bicycle was drawn, the multiple layer assembly model was built based on parametric feature modeling technique, the skeleton model and total design of hydraulic transmission bicycle was accomplished by top-down method and drawings of relevant parts based on three-dimensional model were created. The result shows that top-down method provides a new idea to improve the rapid design of product’s updates.

scholarly journals INTRODUCTION OF 3D MODELING IN THE EDUCATIONAL PROCESS DIFFERENT VIEWS ON THE DEFINITION AND EXPLANATION OF THE CONCEPTS OF MODEL AND MODELING

2021 ◽  
Vol 7 (7(61)) ◽  
pp. 8-15
Author(s):  
Гюнель Сиявуш кызы Новрузова
Keyword(s):  
Computer Graphics ◽  
3D Modeling ◽  
Information Technologies ◽  
Visual Learning ◽  
Three Dimensional ◽  
Educational Process ◽  
Graphic Information ◽  
Relationship Of ◽  
The Relationship

В данной статье анализируются процессы адекватного решения вопросов об организованном и неорганизованном обучении и так называемом наглядном обучении, а также о воспитательном пространстве и о соотношении воспитания и визуализации в образовании, а точнее о процессе представления графической информации визуально и кинестетическим способом с помощью инновационно-информационных технологий. Проведенный нами анализ показал, что умение моделировать в среде трехмерной компьютерной графики позволяет ученику рассмотреть все фигуры при обучении пространственным фигурам в школе. This article analyzes the processes of adequate solution of questions about organized and unorganized learning and the so-called visual learning, as well as about the educational space and the relationship of education and visualization in education, or rather about the process of presenting graphic information visually and kinesthetically using innovative information technologies. Our analysis showed that the ability to model in the environment of three-dimensional computer graphics allows the student to consider all the figures when teaching spatial figures at school.

scholarly journals Geometric modeling and development of custom libraries in the design of engineering facilities

2020 ◽  
pp. 1-7
Author(s):  
Elena Sergeevna Reshetnikova ◽  
Irina Aleksandrovna Savelyeva ◽  
Ekaterina Anatolyevna Svistunova
Keyword(s):  
Design Process ◽  
Computer Aided Design ◽  
Geometric Modeling ◽  
Three Dimensional ◽  
3D Models ◽  
Conveyor Belt ◽  
General Idea ◽  
Design Stage ◽  
Preliminary Design ◽  
Design Documentation

The subject of research is the process of designing a conveyor belt. The authors consider parameterization in geometric modeling of parts and components of equipment and the creation of custom libraries in Compass 3D as a means of reducing the complexity and improving the quality of the design process. The preliminary design is the design stage of the development of design documentation and aims to determine the fundamental design solutions for a general idea of the device, operating principles and dimensions of the product. It is advisable to develop a preliminary design before the stage of developing a technical project and creating design documentation. Today, at all stages of work on the project, modern computer-aided design (CAD) systems are used, which not only accelerate the design process, but also make it possible to demonstrate to the customer the finished project at the stage of making technical decisions. This allows making timely changes in accordance with the requirements of the customer and to carry out high-quality preparation of the project for its implementation. The volume and time for further stages of work depend on the timing of the presentation of the preliminary design, therefore, the use of three-dimensional modeling parametrization in CAD is an effective way for designing engineering objects. Parameterization when working with 3D models allows you to get a set of typical product designs based on a once-created model by changing the set values of the variables, which significantly reduces the time spent on the project.

Benign positional nystagmus: A study of its three-dimensional spatio-temporal characteristics

Neurology ◽  
2005 ◽  
Vol 64 (11) ◽  
pp. 1897-1905 ◽  
Author(s):  
S. T. Aw ◽  
M. J. Todd ◽  
G. E. Aw ◽  
L. A. McGarvie ◽  
G. M. Halmagyi
Keyword(s):  
Three Dimensional ◽  
Positional Nystagmus ◽  
Temporal Characteristics ◽  
Spatio Temporal

scholarly journals The problem of ambiguity in the task of synthesizing a wireframe model objects according to a technical drawing

2019 ◽  
Author(s):  
Валерия Тюрина ◽  
Valeriya Tyurina ◽  
Сергей Ротков ◽  
Sergey Rotkov ◽  
Татьяна Мошкова ◽  
...  
Keyword(s):  
3D Model ◽  
Complete Information ◽  
3D Models ◽  
Standard Procedures ◽  
Technical Drawing ◽  
Graphic Information ◽  
Automatic Reading ◽  
Geometric Elements ◽  
Wireframe Model

The level of quality of the wireframe model obtained in the first stage of solving the problem of restoring the image of a non-planar object depends on the completeness of using the classes of graphic information used to synthesize a 3D model according to the technical drawing. In cases where the drawing is quite simple and allows you to read complete information about the object by existing procedures of automatic "reading the drawing", it is possible to restore the frame models that are fully consistent with the synthesized object. They can be used immediately for further transformations to other types of 3D models. Such frame models are characterized by the fact that all the vertices and edges included in their structure belong to the surface of the desired object. But in most practical cases, when the simulated objects correspond to real products and their technical drawing is full of difficult to formalize information, in the structure of frame models built according to standard procedures, due to a number of objective reasons, there are false geometric elements, i.e. those that are not on the surface of the desired 3D object. This leads to the ambiguity of the restoration of a unique wireframe model corresponding to the object specified in the technical drawing, and requires the development of procedures to avoid the multiplicity of solutions.

scholarly journals DIGITAL ANALYSIS WITH 3D SCANNING AND THREE-DIMENSIONAL MODELLING OF THE MAIN CHURCH OF ST. MARY – THE OLD CATHEDRAL, CARTAGENA (REGION OF MURCIA, SPAIN)

2020 ◽  
Vol XLIV-M-1-2020 ◽  
pp. 327-334
Author(s):  
P. E. Collado-Espejo ◽  
J. García-León ◽  
F. J. Jiménez-González ◽  
C. M. Sánchez-Yepes
Keyword(s):  
Spanish Civil War ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Master Plan ◽  
Digital Analysis ◽  
Dimensional Model ◽  
13Th Century ◽  
Three Dimensional Model ◽  
Graphic Analysis ◽  
Graphic Information

Abstract. The former Church of St. Mary, known as the Old Cathedral, in Cartagena (Region of Murcia, Spain), is a construction from the beginning of the 13th century, but it was transformed in the 16th century and rebuilt at the beginning of the 20th century. The bombings occurring during the Spanish Civil War caused the partial collapse of the building and the state of ruin that it currently presents. It is protected as a PCI with the category of monument. A Master Plan is currently being developed that should lead to the recovery of the building. The "Thermal Analysis and Geomatics (TAG)" Research Group of the Polytechnic University of Cartagena has collaborated in the drafting of the Master Plan with a planimetric survey and graphic analysis of the entire building. For this purpose, digital terrestrial photogrammetry techniques and a 3D laser scanner compatible with classical topography have been used, in order to obtain an accurate three-dimensional model. All this graphic information has been contrasted with the historical, typological, material and constructive information currently available about the building, which has facilitated the making of an exhaustive three-dimensional analysis that permits us to know this ancient Cathedral in depth. This paper will describe the work methodology followed, the technical means used and the results achieved, which have been incorporated into the Master Plan that is being prepared. Undoubtedly, the digital analysis has helped to obtain a better general understanding of the building and to be able to propose a correct formal, structural and material recomposition.

scholarly journals Stochastic parametric skeletal dosimetry model for humans: General approach and application to active marrow exposure from bone-seeking beta-particle emitters

PLoS ONE ◽  
2021 ◽  
Vol 16 (10) ◽  
pp. e0257605
Author(s):  
Marina O. Degteva ◽  
Evgenia I. Tolstykh ◽  
Elena A. Shishkina ◽  
Pavel A. Sharagin ◽  
Vladimir I. Zalyapin ◽  
...  
Keyword(s):  
Bone Tissue ◽  
Heterogeneous Media ◽  
Bone Structure ◽  
Radiation Transport ◽  
Liquid Radioactive Waste ◽  
Three Dimensional ◽  
Individual Variability ◽  
Beta Particle ◽  
Skeleton Model ◽  
Biokinetic Model

The objective of this study is to develop a skeleton model for assessing active marrow dose from bone-seeking beta-emitting radionuclides. This article explains the modeling methodology which accounts for individual variability of the macro- and microstructure of bone tissue. Bone sites with active hematopoiesis are assessed by dividing them into small segments described by simple geometric shapes. Spongiosa, which fills the segments, is modeled as an isotropic three-dimensional grid (framework) of rod-like trabeculae that “run through” the bone marrow. Randomized multiple framework deformations are simulated by changing the positions of the grid nodes and the thickness of the rods. Model grid parameters are selected in accordance with the parameters of spongiosa microstructures taken from the published papers. Stochastic modeling of radiation transport in heterogeneous media simulating the distribution of bone tissue and marrow in each of the segments is performed by Monte Carlo methods. Model output for the human femur at different ages is provided as an example. The uncertainty of dosimetric characteristics associated with individual variability of bone structure was evaluated. An advantage of this methodology for the calculation of doses absorbed in the marrow from bone-seeking radionuclides is that it does not require additional studies of autopsy material. The biokinetic model results will be used in the future to calculate individual doses to members of a cohort exposed to 89,90Sr from liquid radioactive waste discharged to the Techa River by the Mayak Production Association in 1949–1956. Further study of these unique cohorts provides an opportunity to gain more in-depth knowledge about the effects of chronic radiation on the hematopoietic system. In addition, the proposed model can be used to assess the doses to active marrow under any other scenarios of 90Sr and 89Sr intake to humans.

scholarly journals Features of the space-time characteristics of the gait of children and adolescents involved in sports

2018 ◽  
pp. 12-16
Author(s):  
L. A. Udochkina ◽  
O. I. Vorontsova ◽  
L. A. Goncharova ◽  
I. G. Mazin
Keyword(s):  
Children And Adolescents ◽  
Walking Speed ◽  
Female Athletes ◽  
Three Dimensional ◽  
Control Group ◽  
State University ◽  
Temporal Characteristics ◽  
Double Support ◽  
Spatio Temporal ◽  
Spatial And Temporal Characteristics

The study of the spatial and temporal characteristics of the gait of children and adolescents is an important task. The purpose of this study was to determine the spatial and temporal characteristics of the gait of children and adolescents of different age categories who systematically engage in sports.Methods. On motion capture complex Vicon in the Center for Collective Use "Three-dimensional study of the biomechanics of motion" of the Astrakhan State University, 43 children were examined: 22 children in the control group and 21 children in the study group.Results. Quantitative indicators of the spatial and temporal characteristics of the gait of children engaged in sports dancing were obtained and a comparative analysis of this data with the control group was carried out. An increase of walking speed and cadence, a decrease in the time of single and double support in male athletes in the 7-12 year old group was revealed; increased of walking speed and cadence, a marked decrease in the time of single support, a decrease in the limp index in female athletes in the 7-12 year old group; an increase the cadence in female athletes in the group of 12-15 years.Conclusions. Doing sport every day helps with the spatio-temporal changes of the walk among children and teenagers. The imbalance of the motor function is examined among girls, that doing sports between the age of 7-12, so that’s why it needs a special attention from doctors, traumatologist and orthopedists.

The Development and Validation of a Finite Element Human Thorax Model for Automotive Impact Injury Studies

2001 ◽  
Author(s):  
Fred Chang
Keyword(s):  
Finite Element ◽  
Strain Rate ◽  
Material Properties ◽  
Three Dimensional ◽  
Rib Fractures ◽  
Automotive Safety ◽  
Skeleton Model ◽  
Rib Cage ◽  
Rate Dependent ◽  
Human Thorax

Abstract Computational simulations are becoming more important in automotive safety engineering. To simulate the occupants during the crash environment, dummies are currently used to represent the occupants. However, current dummies and dummy models lack the detailed information to predict the occupant injuries during a crash. And for the human thorax models, simplified geometry and non strain-rate material properties were used for the rib cage with no ability to simulate the rib fractures often seen in an automotive crash. Therefore, a detailed finite element human thorax model with proper material properties and the capability to simulate the rib fractures is needed to better understand the thoracic injuries under frontal and side impacts. The current thorax model, based on a previous skeleton model with heart and lung by Deng et al. [1]. used digital surface images to construct the three-dimensional finite element representation of the spine, rib cage, arms, surface muscles, heart, lungs, and major blood vessels. Strain-rate-dependent properties were utilized for the rib cage. With the rib fracture prediction, the model showed good correlation with the test results.

Sign in / Sign up

Export Citation Format

Share Document