scholarly journals КАРКАСНА МОДЕЛЬ ОДНООСНОГО РОЗТЯГУВАННЯ КУЛІРНОГО ТРИКОТАЖУ ВЗДОВЖ ПЕТЕЛЬНИХ СТОВПЧИКІВ

2021 ◽  
Vol 154 (1) ◽  
pp. 43-53
Author(s):  
Т. В. Єліна ◽  
Л. Є. Галавська ◽  
В. Ю. Щербань ◽  
О. З. Колиско ◽  
С. Ю. Боброва
Keyword(s):  
Geometric Modeling ◽  
Three Dimensional ◽  
Research Process ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Frame Model ◽  
Three Dimensional Modeling ◽  
Characteristic Points ◽  
Computer Environment ◽  
Knitted Structure

The purpose of this study is to develop a frame model for stretching the weft-knits in the wale direction, suitable for further integration into the algorithm for building a three-dimensional knitwear model in a stretched state and modeling of interactive deformation dynamics. Methodology.  Methods  of  theoretical  analysis,  basics  of  knitting  theory,  topological  model  of knitwear, methods of geometric modeling and parameterization were used in the research process. Findings. Modeling the physical and mechanical behavior of knitwear in a computer environment is one of the promising ways to increase the level of conformity of knitted products with the requirements of comfort and functionality. However, the complexity of the internal structure, the anisotropy of properties and the instability of the parameters of the loop structure determine the need to find non-trivial ways to solve the problem of mathematical description of the three-dimensional model of the thread, knitted in the knitwear, considering the stretching deformations. During  the  study,  a  frame  model  of  a  uniaxial  stretching  of  knitwear  in  the  wale  direction  was developed. The basis of the frame model is the idea of a knitted structure, represented as a logically organized set of elements, each of which is interlaces with other elements in accordance with the topology of knit. The frame of the jersey fragment is described as a set of bars and hinges. The hinges are located at the interlacing points of the loop heads and loop feet, and each rod in the model is an imaginary element representing a complex of force factors that prevent the change of distance between the hinges connected to the given rod. In the process of stretching, the geometrical characteristics of the elements change, while the logical connections remain unchanged. The wireframe model allows to define coordinates of interlacement points in the coordinate system of the sample, relative position of coordinate systems of each elementary fragment, which correspond to  given  loops,  coordinates  of  characteristic  points  of  a loop  for  transition  to  a three-dimensional model of a knitted structure. Scientific novelty. For the first time, a frame model of deformation of the knit, suitable for three-dimensional modeling of its structure, considering deformation of the thrust, was developed. Practical value. The developed model can be used as mathematical support of systems of automated designing of knits.

scholarly journals КАРКАСНА МОДЕЛЬ РОЗТЯГУВАННЯ КУЛІРНОГО ТРИКОТАЖУ ВЗДОВЖ ПЕТЕЛЬНИХ РЯДІВ

2022 ◽  
pp. 60-69
Author(s):  
SVITLANA BOBROVA ◽  
TETIANA YELINA ◽  
LIUDMYLA HALAVSKA ◽  
VOLODYMYR SHCHERBAN ◽  
OKSANA KOLISKO
Keyword(s):  
Geometric Modeling ◽  
Relative Elongation ◽  
Three Dimensional ◽  
Complex Model ◽  
Knitted Fabric ◽  
Three Dimensional Model ◽  
Knitted Fabrics ◽  
Frame Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling

Purpose. The purpose of this study is to develop a mathematical description of the transformation of the frame model of weft-knits under the action of tensile forces in the courswise direction for further three-dimensional modeling of the knited structure.Methodology. Methods of theoretical analysis and synthesis, basics of knitting theory, methods of geometric modeling and parameterization were used in the research process.Findings. Considering the knitwear stretching during the use of the clothing is one of the determining factors of the quality of design decisions. When stretching the weft-knitted fabrics in the coursewise direction, the configuration of its individual stitches’ changes, as well as the thread’s cross-section due to the force interaction between the adjacent structure elements. To simulate the physical and mechanical behavior of knitwear under the stretching, it is suggested using a complex model of knitwear deformation, that includes the suggested frame model of uniaxial coursewise stretching of knitted fabrics. An algorithm for constructing a frame model of stretching a sample of knitted fabric in the coursewise direction is described in the paper. The algorithm is based on the structure parameters, including the wale spacing and course spacing in a dry relaxed state, the relative elongation of the sample at the time of modeling, number of wales and courses in the sample, the coefficient of courses narrowing. Scientific novelty. The paper investigates the features of the transformation of the knitting structure during stretching in the coursewise direction and offers algorithmic and mathematical support for the automated generation of the mesh frame in the context of three-dimensional modeling, which provides for the possibility of considering the dynamics of deformation of knitted fabric undergoing tensile deformations.Practical value. Frame model of the weft-knits deformation and algorithm of mesh-frame construction suggested in the paper, form the basis for determination of coordinates of characteristic points of the structural elements of the knit in a state of uniaxial tension for construction of a three-dimensional model of thread a deformed knitted fabric.

scholarly journals DESIGNING A THREE-DIMENSIONAL MODEL OF THE CLASS SAFETY FOR THE RAILWAYS IN THE PROGRAM ASCON KOMPAS

2019 ◽  
Vol 7 ◽  
pp. 62-66
Author(s):  
Alexandra Zhuravleva
Keyword(s):  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Training Class ◽  
A Company ◽  
Safety Rules

This article demonstrates the possibility of a graphical program Kompas ASCON in the sphere of three-dimensional modeling of engineering and building objects. The created three-dimensional model of the training class for employees of JSC "Russian Railways" to study safety rules can have a real embodiment – all components are built according to catalogs and statements. In the course of work on this project various tools of the program are mastered: models of the room of a class of furniture are created. The basic operations of three-dimensional modeling and methods of creating assembly units are studied. All components of the class are paired. The resulting project has a high visibility and can be used as a presentation as a company that performs class projects, and the customer.

A Study of Three Dimensional Modeling Technology on Food Twin-Screw Extruder

2011 ◽  
Vol 55-57 ◽  
pp. 550-554
Author(s):  
Chun Fang Zhao ◽  
Jiang Jiao Lin ◽  
Li Xue Zhu
Keyword(s):  
Product Design ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Screw Extruder ◽  
Modeling Technology ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Twin Screw ◽  
Specific Modeling

Three-dimensional model of the parts of the extrusion extruder for leisure food is created as an illustrator, which could be adopted up to form an assemble facility to the whole set of the machine conveniently by a software of SolidWorks in the paper.Some key specific modeling procedures are proved to show the advantages of Solidworks overweigh AutoCAD in three-dimensional modeling technology. The method put an adaptable way to short the whole lifetime of industrial product design.

scholarly journals Challenges and approaches in three-dimensional modeling the engineering geological conditions of Hanoi area

2020 ◽  
Vol 61 (2) ◽  
pp. 1-9
Author(s):  
Ha Viet Nhu ◽  
Keyword(s):  
High Resolution ◽  
Statistical Evaluation ◽  
Three Dimensional ◽  
Geological Structure ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Geological Engineering ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Geological Conditions

In this study, the approaches and research methods have been proposed based on the analysis of challenges in modeling, establishing a three-dimensional model of geological engineering conditions of the Hanoi area. The three-dimensional model of the Hanoi area was composed of 21 geological engineering units as a stacked structure, with accuracy and reliability were verified by statistical evaluation. Based on the integration of engineering geological attributes, the model has contributed for reconstruction of the geospatial engineering geological structure of the study area as comprehensive, continuously, and high resolution.

Three-Dimensional Modeling and Finite Element Analysis of the Hydraulic Support

2013 ◽  
Vol 712-715 ◽  
pp. 1002-1005
Author(s):  
Ling Hui Li ◽  
Xiao Wen Zheng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Hydraulic Support ◽  
Element Analysis ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Partial Load

A three-dimensional model of two columns covering hydraulic support was created by Pro/E software. The model was imported into ABAQUS software for finite element analysis. The stresss distribution of the hydraulic support in the conditions of the top beam partial load and the base reversed was got. The result was a reference in the design and structural optimization of the hydraulic support.

scholarly journals BUILDING A THREE-DIMENSIONAL MODEL OF AXIAL JET IN SOLIDWORKS

2019 ◽  
Vol 7 ◽  
pp. 76-79
Author(s):  
Vladimir Papulov
Keyword(s):  
Computer Simulation ◽  
Three Dimensional ◽  
Machine Building ◽  
Water Jet ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Building Orientation

The article provides a brief description of the construction of the main parts of the three-dimensional model of the axial water jet, followed by their Assembly into the finished product. The role of computer simulation in the design of complex types of propellers, which include water jet, is shown. The possibility of solving problems of hydrodynamics with the help of "SolidWorks"is demonstrated. The design of the water jet pipe, taking into account the absence of cavitation. The urgency of application of three-dimensional modeling in the field of shipbuilding, using CAD-programs of machine-building orientation is shown.

Three-Dimensional Modeling Efficiently Based on the 3DMAX and OPENGL

2012 ◽  
Vol 546-547 ◽  
pp. 680-685
Author(s):  
Jie Fang ◽  
Xiao Feng Wang
Keyword(s):  
Three Dimensional ◽  
Complex Model ◽  
Good Effect ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Window Frame ◽  
Three Dimensional Modeling ◽  
Window System ◽  
Dimensional Modeling

OpenGL is independent of the window system, and did not provide the function to draw complex three-dimensional model, so it is difficult to properly control OpenGL and create complex model .This paper will achieve to build complex three-dimensional model efficiently and take good effect in practice with combining OpenGL and 3Dmax or with the help of functions of VC++ to develop based on applying window frame of Windows powerfully.

The Atomic Force Microscope as a Nanoscale Stereo Lithography Machine

2007 ◽  
Author(s):  
Matthew S. Johannes ◽  
Daniel G. Cole ◽  
Robert L. Clark
Keyword(s):  
Atomic Force Microscope ◽  
Silicon Substrate ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Atomic Force ◽  
Patterning Technique ◽  
Nanoscale Fabrication

Atomic force microscope (AFM) based anodization nanolithography on semiconducting layers is a useful tool for nanoscale fabrication. A custom AFM patterning technique has been created that couples CAD with the lithographic capabilities of the AFM. Designed nanostructures to be deposited on a silicon substrate are rendered as a three-dimensional model using CAD. AFM based anodization nanolithography is then used to replicate the features at the nanoscale using automated voltage bias and humidity modulation as prescribed by the model and dictated by the system. The work presented outlines the advantages and limitations when three-dimensional modeling is combined with nanoscale lithography using an AFM.

scholarly journals APPLICATION OF THREE-DIMENSIONAL MODELING TO OPTIMIZE THE DIMENTIONS OF THE SPEED CONTROL DEVICE WITH ROTARY STOPPER IN THE FORM OF A CLOSED-LOOP HYDRAULIC SYSTEM

2021 ◽  
pp. 91-96
Author(s):  
Oleh Strilets ◽  
Oleh Malashchenko ◽  
Anton Stepaniuk
Keyword(s):  
Hydraulic System ◽  
Closed Loop ◽  
Three Dimensional ◽  
Control Device ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Speed Change ◽  
Gear Differential

The aim of this work is to create a three-dimensional model of a new speed change control device using an engineering CAD system Solidworks. In particular, the article describes the methods of computer construction of a three-dimensional model of a rotary stopper in the form of a closed-loop hydraulic system of the device for smooth control of speed changes through a gear differential. The control link can be either a ring gear, or a carrier, or a sun gear. Ways of creating new parts of the device, use of elements from standard libraries and coordination of their dimensions in assembly have been considered. The ability to parameterize the dimensions allows you to automate the creation of both a single part and the whole device of a particular design, based on the specified source data. The application of special meshes for modeling movable and fixed joints allows you to correctly place the parts, control the correctness of their assembly, and then conduct kinematic and power studies of the device, animate its elements in motion. It has been concluded that the use of computer three-dimensional modeling in the design of such stoppers allows: at the initial stage of design to get a visual idea of the stopper of rotational motion; use a computer to view the created model from any point; easy to edit three-dimensional models, i.e. make the necessary changes; achieve great savings in time and design costs; get a large number of possible design solutions that need to be analyzed in detail and in depth to choose the rational, i.e. the best fit. The created model of the stopper of rotational movement allows to choose the optimal place of its installation in a gear differential of the device of speed change from the point of view of use of the minimum sizes and volume. Based on this, computer simulation must precede design. Keywords: three-dimensional modeling; rotary stopper; closed-loop hydraulic system; gear differential

scholarly journals Potential impact of iodinated replacement compounds CF<sub>3</sub>I and CH<sub>3</sub>I on atmospheric ozone: a three-dimensional modeling study

2010 ◽  
Vol 10 (7) ◽  
pp. 16659-16690
Author(s):  
◽  
K. O. Patten ◽  
D. J. Wuebbles ◽  
◽  
Keyword(s):  
Transport Model ◽  
Stratospheric Ozone ◽  
Three Dimensional ◽  
Atmospheric Ozone ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Model Calculations ◽  
Three Dimensional Modeling ◽  
Land Surfaces ◽  
The Tropics

Abstract. The concept of Ozone Depletion Potentials (ODPs) is extensively used in policy considerations related to concerns about the effects of various halocarbons and other gases on stratospheric ozone. Many of the recent candidate replacement compounds have atmospheric lifetimes shorter than one year in order to limit their environmental effects, especially on stratospheric ozone. Using a three-dimensional global chemistry-transport model (CTM) of the troposphere and the stratosphere, the purpose of this study is to evaluate the potential effects of several very short-lived iodinated substances, namely iodotrifluoromethane (CF3I) and methyl iodide (CH3I), on atmospheric ozone. Like other chemicals with extremely short lifetimes, the stratospheric halogen loading and resulting ozone effects from these compounds are strongly dependent on the location of emissions. For CF3I, a possible replacement candidate for bromotrifluoromethane (CF3Br), ODPs derived by the three-dimensional model are 0.008 with chemical lifetime of 5.03 days and 0.016 with a lifetime of 1.13 days for emissions assumed to be evenly distributed over land surfaces at mid-latitudes and the tropics, respectively. While this is the first time the ODPs have been evaluated with a three-dimensional model, these values are in good agreement with those derived previously. The model calculations suggest that tropical convection could deliver a larger portion of the gas and their breakdown products to the upper troposphere and lower stratosphere if emission source is located in the tropics. The resulting ODP for CH3I, emitted from mid-latitudes, is 0.017 with lifetime of 13.59 days. The validity of our model iodine chemistry to evaluate ODPs of the iodine species is guaranteed with good qualitative agreement between the model derived distribution of background CH3I, based on global source emission fluxes from previous studies, and available observations especially in vertical profiles.

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