Geometrical Modelling of Jacquard Quilted Structures Weft Knitted Fabrics

2016 ◽  
Vol 11 (1) ◽  
pp. 155892501601100
Author(s):  
Lanming Jin ◽  
Gaoming Jiang ◽  
Honglian Cong ◽  
Chenguang Hou
Keyword(s):  
3D Model ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Knitted Fabric ◽  
Loop Model ◽  
Visual Effects ◽  
Knitted Fabrics ◽  
Simulation Process ◽  
Geometrical Modelling ◽  
Simulation Results

Jacquard quilted structure weft-knitted fabrics have many advantages, such as strong stereoscopic patterns, soft handling, adjustable apparel thickness, and use as home textiles. However, the final visual effects of such fabrics are difficult to predict prior to processing because of the rough surface caused by the connecting yarn and the inlay yarn of the fabric. This research applied a three-dimensional (3D) model instead of the original single-loop model to simulate knitted fabric. The 3D model is more suitable for a multilayer fabric because the simulation is quick, real, and convenient. The article includes experiments on structural parameters concerning regular dents of different samples, analysis of parameter data about the surface, and the simulation process with the objective of understanding the computer simulation of fabric. Results show good correlation between the simulation results and the actual fabric. Importantly, we can clearly see the expected effects in the fabrics without going through production and processing. This research will be useful for establishing a quick computer-generated simulation system for multilayer fabrics.

Research on the surface of multilayer weft knitted fabrics using computer simulation

2015 ◽  
Vol 27 (4) ◽  
pp. 561-572 ◽  
Author(s):  
Lanming Jin ◽  
Gaoming Jiang
Keyword(s):  
Computer Simulation ◽  
Large Scale ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Surface Model ◽  
Knitted Fabric ◽  
Loop Model ◽  
Knitted Fabrics ◽  
Content Type ◽  
3D Effect

Purpose – Multilayer weft knitted fabrics possess many advantages, such as strongly stereoscopic patterns, soft handling and adjustable thickness of apparel and home textiles use. However, it is difficult to predict the final visual effects before the productive process because of the three-dimensional (3D) effect caused by the connecting yarn of the fabric. The purpose of this paper is to realize a realistic simulation of the fabric. Design/methodology/approach – The authors applied to the curve and surface model to simulate the knitted fabric, instead of previous single loop model by NURBS. Macro simulation is more suitable for the fabric with the 3D effect because of the quick, real and convenient simulation. This research includes experiments on the structural parameters concerning the regular sag of multilayer weft knitted fabrics, and analysis of parameter data and the simulation process with the aim of realizing a computer simulation of the fabric, especially with a sense of reality. The Digital Elevation Model was also applied to build a simulated 3D model. Findings – To obtain the values for the change rules, different samples were used and the outputs of the model were found to be close to the experimental results. The thickest and thinnest lengths and the changing curves between them were established. Patterned simple multilayer weft knitted fabric could be simulated through the results of the research. It is possible to simulate different real fabrics using their materials and expected effects. The authors are going to improve the model to simulate the complicate large-scale jacquard fabrics in further research. Practical implications – The results will be useful for establishing a computer surface simulation system for stereo perception of fabrics. Originality/value – The authors put forward the concept of surface warpage degree (R). It is an important factor affecting the fabric stereo feeling. The larger the value of R, the stronger the stereo sense of the fabric. It could be applied to most 3D fabric. A thickness difference testing method was proposed to characterize the stereo perception of fabrics. It is possible to simulate different real fabrics quickly without the model of the woven loop.

scholarly journals Simulations of Heat Transport Phenomena in a Three-Dimensional Model of Knitted Fabric

2016 ◽  
Vol 16 (3) ◽  
pp. 128-137 ◽  
Author(s):  
A.K. Puszkarz ◽  
R. Korycki ◽  
I. Krucinska
Keyword(s):  
Structural Parameters ◽  
Three Dimensional ◽  
Morphological Properties ◽  
Knitted Fabric ◽  
Dimensional Approach ◽  
Three Dimensional Model ◽  
Knitted Fabrics ◽  
Current Form ◽  
Thermal Phenomena ◽  
Fabric Structures

Abstract The main goal of the current work is to analyse the three-dimensional approach for modelling knitted fabric structures for future analysis of physical properties and thermal phenomena. The introduced model assumes some simplification of morphology. First, fibres in knitted fabrics are described as monofilaments characterized by isotropic thermal properties. The current form of the considered knitted fabric is determined by morphological properties of the used monofilament and simplification of the stitch shape. This simplification was based on a particular technology for the knitting process that introduces both geometric parameters and physical material properties. Detailed descriptions of heat transfer phenomena can also be considered. A sensitivity analysis of the temperature field with respect to selected structural parameters was also performed.

scholarly journals Influence of Electric Field Coupling Model on the Simulated Performances of a GaN Based Planar Nanodevice

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
K. Y. Xu ◽  
Z. N. Wang ◽  
Y. N. Wang ◽  
J. W. Xiong ◽  
G. Wang
Keyword(s):  
Electric Field ◽  
3D Model ◽  
Second Harmonic ◽  
Strong Electric Field ◽  
Three Dimensional ◽  
Harmonic Oscillation ◽  
Two Dimensional ◽  
Dc Bias ◽  
Simulation Results ◽  
2D Model

The performances of a two-dimensional electron gas (2DEG) based planar nanodevice are studied by a two-dimensional-three-dimensional (2D-3D) combined model and an entirely 2D model. In both models, 2DEGs are depicted by 2D ensemble Monte Carlo (EMC) method. However electric field distributions in the devices are obtained by self-consistently solving 2D and 3D Poisson equations for the 2D model and the 2D-3D model, respectively. Simulation results obtained by both models are almost the same at low bias while showing distinguished differences at high bias. The 2D model predicts larger output current and slightly higher threshold voltage of Gunn oscillations. Although the fundamental frequencies of current oscillations obtained by both models are similar, the deviation of wave shape from sinusoidal waveform obtained by the 2D model is more serious than that obtained by 2D-3D model. Moreover, results obtained by the 2D model are more sensitive both to the bias conditions and to the change of device parameters. Interestingly, a look-like second harmonic oscillation has been observed at DC bias. We contribute the origin of divergences in simulation results to the different coupling path of electric field in the two models. And the second-harmonic oscillations at DC bias should be the result of the appearance of concomitant oscillations beside the channel excited by strong electric-field effects.

Structural Optimization of Three Translational Parallel Sorting Robot

2014 ◽  
Vol 552 ◽  
pp. 179-182
Author(s):  
Jun Xie ◽  
Hui Deng ◽  
Qi Zhi Yang ◽  
Yue Liu
Keyword(s):  
Coordinate Transformation ◽  
Structural Parameters ◽  
Minimum Weight ◽  
Three Dimensional ◽  
Search Method ◽  
Minimum Mass ◽  
Parallel Sorting ◽  
Matlab Program ◽  
Simulation Results ◽  
Moving Parts

The kinematics model of the robot was established, and its structural parameters were studied. Based on coordinate transformation, the inverse solution of the robot was obtained. Its workspace was solved by MATLAB program. Three-dimensional diagram and projection drawing on XY plane of workspace were obtained. In addition, the sorting range various with the different value of Z was studied and obtained. Finally, on the premise of meeting working range of the robot, using the minimum mass of the moving parts as optimization objective, the structural parameters of the sorting robot were optimized using the search method. Simulation results show that the optimized robot can achieve the minimum weight of moving parts and meet the preset sorting range. It is also ensured the sorting flexibility.

scholarly journals Design and electromagnetic analysis of switched reluctance linear generator in electric vehicle

2021 ◽  
Vol 2108 (1) ◽  
pp. 012016
Author(s):  
Jieyu Liu ◽  
Ye Tang ◽  
Wenyu Cheng ◽  
Changpeng Li
Keyword(s):  
Finite Element ◽  
3D Model ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Element Analysis ◽  
Switched Reluctance ◽  
Linear Generator ◽  
Simulation Results

Abstract The structural characteristics and basic design requirements of design of switched reluctance linear generator are introduced. According to the general principles and design experience of electromechanical design, the dimension of design of switched reluctance linear generator is determined, and the two-dimensional and three-dimensional static finite element models of design of switched reluctance linear generator are established in Flux 2D and Flux 3D respectively. By comparing the simulation results of the two-dimensional model and the three-dimensional model, it is found that the difference between the real simulation results of the 2D model and the 3D model is small, and the calculation time cost of the 2D finite element simulation is much lower than that of the 3D model. Therefore, the subsequent work of this paper adopts the 2D finite element model. Finally, the static electromagnetic field and electromagnetic characteristics of the design of switched reluctance linear generator are analyzed by finite element analysis.

Prediction of deformation behavior of single jersey cotton knitted fabrics using finite element method

2014 ◽  
Vol 26 (3) ◽  
pp. 222-234 ◽  
Author(s):  
E. Perumalsamy ◽  
J.C. Sakthivel ◽  
N. Anbumani
Keyword(s):  
Finite Element ◽  
Tensile Test ◽  
Deformation Behavior ◽  
Structural Changes ◽  
Knitted Fabric ◽  
Loop Length ◽  
Loop Model ◽  
Knitted Fabrics ◽  
Content Type ◽  
Single Jersey

Purpose – The purpose of this paper is to elucidate the stress-strain relationships of single-jersey knitted fabrics from uniaxial tensile test followed by deformation behavior using finite element analysis. In order to elaborate the study, high, medium and low tightness knitted fabrics were selected and deformation of fabrics analyzed in course, wales and bias directions (0, 45 and 90 degrees). Design/methodology/approach – This study focussed on uni-axial tensile test of produced test samples using Instron 6021 tester and a development of single-jersey knitted loop model using Auto Desk Inventor software (ADI). The knitted fabric material properties and knitted loop model was imported to ANSYS 12.0 software. Findings – Due to structural changes the tightness and thickness of knitted fabric decreases with increase in loop length The tensile result shows maximum breaking strength at course direction (13.43 kg f/mm2 at 2.7 mm) and maximum extension at wales direction (165.77 kg f/mm2 at 3.3 mm). When the loop length increases, the elongation of fabrics increased and load carrying capacity of fabrics reduced. The Young's modulus, Poisson's ratio and shear modulus of fabrics reduced with increase in loop length. The deformation of fabrics increased with increase in loop length. The increase in loop length gives large amount of structural changes and it is due to slacking or jamming in loops and loosening in dimensions. When comparing the deformation results, the variation within the fabric is higher and structural damage little more when increasing the loop length of the fabric. Originality/value – From ANOVA test, stress and strain distribution was statistically significant among course, wales and bias directions at 95 percent confidence level. The values got from Instron test indicates that testing direction can alter its deformation. In deformation analysis, comparing both experimental and prediction, high amount of structural changes observed in wales direction. The used tetrahedral elements can be used for contact analysis with high accuracy. For non-linear problems, consistent approach was proposed which makes the sense to compare with experimental methods. The proposed model will make possible developments and the preliminary validation tests shows good agreement with experimental data.

Enhancing the coupling of a two-coil system using a superscatterer

2016 ◽  
Vol 30 (05) ◽  
pp. 1650015 ◽  
Author(s):  
Chen Yao ◽  
Yingyi Zhang ◽  
Dianguang Ma ◽  
Houjun Tang
Keyword(s):  
Computational Complexity ◽  
Energy Harvesting ◽  
3D Model ◽  
Magnetic Energy ◽  
Three Dimensional ◽  
Transformation Optics ◽  
Two Dimensional ◽  
Axisymmetric Model ◽  
Coil System ◽  
Simulation Results

In an example scenario of magnetic energy harvesting, a spherical superscatterer is introduced to enhance coupling in a two-coil system. Although a three-dimensional (3D) model is preferred to fully model behavior in this example, to reduce computational complexity, an extension of transformation optics (TO) is proposed to reduce a 3D model to a two-dimensional (2D) axisymmetric model. The simulation results show details of a quasi-3D model of the superscatterer coupling enhancement of a two-coil system.

Study on Three-Dimension Computer Simulation of Plain Knitted Fabrics

2011 ◽  
Vol 213 ◽  
pp. 595-599 ◽  
Author(s):  
Ying Lin Li ◽  
Su Ying Chen ◽  
Lian He Yang ◽  
Li Hui Cao
Keyword(s):  
Computer Simulation ◽  
Dimensional Space ◽  
Geometric Model ◽  
Three Dimensional ◽  
Knitted Fabric ◽  
Three Dimension ◽  
Knitted Fabrics ◽  
Plain Knitted Fabric ◽  
Knitted Structure ◽  
Shear Condition

How to achieve a realistic computer simulated effect of plain knitted fabric was explored in this article based on analyzing the geometric model of plain knitted fabric loop. In Visual C++ and OpenGL environment, select the circle as cross-section and use cubic B-Spline curve to simulate the yarn path, then the three-dimensional computer simulation of plain knitted fabric is realized in its general condition and it’s shear condition. The simulation results distinctly show the intermeshed loops and transformation effects of knitted structure in three-dimensional space.

Geometrical and mechanical modelings of dry relaxed slack plain knitted fabrics for the benefit of technical textile applications part II: Mechanical modeling induced by friction

2016 ◽  
Vol 87 (7) ◽  
pp. 853-864 ◽  
Author(s):  
Arif Kurbak
Keyword(s):  
Mechanical Properties ◽  
Elasticity Theory ◽  
Mechanical Model ◽  
Three Dimensional ◽  
Stable State ◽  
Geometrical Model ◽  
Knitted Fabric ◽  
Mechanical Modeling ◽  
Knitted Fabrics ◽  
Plain Knitted Fabric

In this work, based on the geometrical model given in Part I, a mechanical model is created for dry relaxed slack plain knitted technical fabrics including the three-dimensional friction effects. The equilibrium of forces and moments applied on a loop are written by using the elasticity theory of thin rods. Through this model, it is shown that a dry relaxed plain knitted fabric can be in a stable state induced by friction. The application of the model was carried out on E-glass technical fabric, which was also used in Part I as its dimensional properties were obtained through the created geometrical model. In the current part, Part II, the mechanical properties of this fabric are obtained and discussed as an exemplary application.

The Research of Digital Sandbox System

2013 ◽  
Vol 756-759 ◽  
pp. 1798-1802
Author(s):  
Hui Bai Wang ◽  
Jian Feng Hou
Keyword(s):  
Computer Technology ◽  
3D Model ◽  
State Of The Art ◽  
Three Dimensional ◽  
Stereoscopic Display ◽  
Visual Effects ◽  
Multimedia Presentations ◽  
3 Dimensional ◽  
Surface Image ◽  
Advanced Computer

Digital sandbox is mainly the use of advanced computer technology, adding vivid images multimedia presentations and interactive features, such as 3D-3 dimensional animation and 3D model, combined with state-of-the-art optical imaging technology, on the basis of the existing traditional sandbox, to entertain visitors with dynamic visual effects, beautiful and multi-faceted show. The system for digital sandbox, the study of the generation and synthesis of the of holographic imaging surface image, with MAYA combined, quickly generate the image in all directions, and synthesis, resulting in a realistic three-dimensional scene; interactive virtual scene with speakers, through data gloves to control scene, to reach a wonderful stereoscopic display effect.

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