Structural deformation behavior of Jacquardtronic lace based on the mass-spring model

2016 ◽  
Vol 87 (10) ◽  
pp. 1242-1250 ◽  
Author(s):  
Xinxin Li ◽  
Aijun Zhang ◽  
Pibo Ma ◽  
Honglian Cong ◽  
Gaoming Jiang
Keyword(s):  
Deformation Behavior ◽  
Euler Method ◽  
Structural Deformation ◽  
Spring Model ◽  
Yarn Tension ◽  
Detection Model ◽  
Motion State ◽  
Mass Spring Model ◽  
Simulator Program ◽  
Mass Spring

To simulate the structural deformation behavior of Jacquardtronic lace, which is formed on a multibar Jacquard Raschel machine and is widely used in female fashion, the key influencing factors on structural deformation were introduced and a tailored mass-spring model was built in which the lace was considered to be numbers of evenly distributed particles connected by elastane springs. These springs covered structural springs, restriction springs and spiral springs, respectively, created for ground pillars, Jacquard inlays, pattern lapping and elastane yarns. The elastane force on particles was analyzed to study motion state and deformation behavior with the explicit Euler method. The deformation simulated models were implemented by a simulator program via Visual C++ and were tested with a lace sample. Particular attention was paid to analyzing the effect of Jacquard structures and yarn tension on deformation and the detection model was introduced to avoid improper deformation caused by excessive yarn tension. The simulation results showed practicability and efficiency when compared with the real sample.

scholarly journals A Calculation Method for the Deformation Behavior of Warp-Knitted Fabric

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Haisang Liu ◽  
Gaoming Jiang ◽  
Zhijia Dong ◽  
Shuai Jin
Keyword(s):  
Deformation Behavior ◽  
Structural Characteristics ◽  
Loop Model ◽  
Control Points ◽  
Spring Model ◽  
Mass Spring Model ◽  
Fabric Deformation ◽  
Warp Knitted Fabric ◽  
Simulator Program ◽  
Mass Spring

Abstract In this paper, a new method to simulate the structure and loop deformation behavior of double-bar reflex-lapping warp-knitted fabrics based on the structural characteristics is proposed. A simplified mass-spring model was built in which loops knitted by filaments were considered as particles with the uniform mass distribution connected by structure springs for overlaps and shear springs for underlaps. Deformation forces and direction on particles were analyzed to describe the displacement and deformation behavior of particles. A loop model with eight control points was established, and the relationship between control points and particles was studied combining the quadratic Bezier curves. The deformation simulation was implemented by a simulator program with C# and JavaScript via web technology on Visual Studio 2015. The stereoscopic sense of filaments was realized by changing the direction and intensity of the light. The results show that the fabric deformation and the loop shape can be accurately achieve using the simplified mass-spring model compared with the real sample.

scholarly journals Real-Time Cloth Simulation for Hula Costume CAD Development

2021 ◽  
Vol 10 (3) ◽  
pp. 85-89
Author(s):  
Taketo Kamasaka ◽  
◽  
Kodai Miyamoto ◽  
Makoto Sakamoto ◽  
◽  
...  
Keyword(s):  
High Performance ◽  
Euler Method ◽  
The Body ◽  
Spring Model ◽  
Kutta Method ◽  
Runge Kutta Method ◽  
Mass Spring Model ◽  
Simulation Results ◽  
Mass Spring ◽  
Very High

In recent years, 3D computer graphics (3DCG) technology has been applied in various fields such as AR technology, VR technology, movies, games, and virtual fitting of clothes. Among them, there is the problem of contact between clothing and other objects (such as the body). In this paper, we focus on that problem. Since this research is part of the development of CAD for the design of hula costumes, and since we assume that the users of the CAD will have PCs with not very high performance, we took an approach that does not require a large amount of computation. As a representation of the cloth, we used a mass-spring model in which springs and mass points are connected in a grid. We also compared how the three methods of calculating position and velocity, Euler method, FB Euler method, and Runge-Kutta method, affect the simulation results.

Modeling of double-layer jacquard fabrics for pattern simulation

2018 ◽  
Vol 30 (5) ◽  
pp. 698-709 ◽  
Author(s):  
Honglian Cong ◽  
Xinxin Li ◽  
Aijun Zhang ◽  
Yanting Zhang ◽  
Jun Zhong
Keyword(s):  
Double Layer ◽  
Computer Aided Design ◽  
Mathematic Model ◽  
Advanced Technology ◽  
Structural Deformation ◽  
Spring Model ◽  
Time Saving ◽  
Content Type ◽  
Mass Spring Model ◽  
Mass Spring

Purpose Double-jacquard technique is referred as the most advanced technology for forming patterns on both layers of a 3D fabric knitted on a double-needle bar warp-knitting machine. In order to realize the computer-aided design and simulation of jacquard patterns, the purpose of this paper is to propose a mathematic model for representation of jacquard structures and an improved mass-spring model to improve the simulation of structural deformation behavior. Design/methodology/approach Primarily, it analyzes the jacquard patterning method and displacing principle to design jacquard structures on each layer and linking structures of two layers. Based on that, a loop geometry defined by six key points and segmental lines is built to transfer the jacquard bitmap and lapping movements into a fabric of loops and therefore realizing patterns visualization. Afterwards, an improved mass-spring model is built to simulate structural deformation, in which the fabric is simplified as a mesh of uniformly distributed mass particles. Each loop is treated as a massless particle while underlaps are referred as structural springs connecting loops particles. Elastic forces of these springs on each loop particle is calculated according to the Hook’s law and Newton’s second law, and then based on the explicit Euler’s equations, motion state of each particle is solved including the velocity and the shift. Findings Based on the above method, a simulator for double-layer jacquard fabrics is developed via Visual C++ language to visualize the patterned fabrics with pitting effects. With a jacquard shoe fabric as an example, this simulation model is proved to be practical and efficient by comparing the simulation result and real fabric. Research limitations/implications Because of limited researches, 3D simulation modeling of this double-layer jacquard fabric will be studied in the further research. Practical implications The implement of this simulation method will offer the industries a time-saving and cost-saving approach for new fabrics development. Originality/value This approach can be used as a reference for simulating other knitted fabrics with jacquard patterns, such as jacquard garment fabrics and home textile fabrics.

A Simple Dynamic Model for Beams Subjected to Blast Loads

2012 ◽  
Vol 479-481 ◽  
pp. 1763-1767
Author(s):  
Z.N. Yin
Keyword(s):  
Dynamic Response ◽  
Deformation Behavior ◽  
Spring Model ◽  
Blast Loads ◽  
Lumped Mass ◽  
Proposed Model ◽  
Mass Spring Model ◽  
Three Degree Of Freedom ◽  
Mass Spring ◽  
The Relationship

A three Degree-of-Freedom (DoF) mass-spring model is proposed to predict the dynamic response of clamped supported beams subjected to blast loads at the mid-span of the beam. The stiffness of inelastic spring is defined from the relationship between force and mid-span displacement of beams subjected to blast loads. The lumped mass is calculated from the equivalency between the model and beam based on the fundamental frequency. Clamped supported solid beams and T-beams are taken as typical examples to verify the proposed model. And the influence of geometric parameters on deformation behavior is discussed in details.

scholarly journals Review on the 3-D simulation for weft knitted fabric

2021 ◽  
Vol 16 ◽  
pp. 155892502110125
Author(s):  
Sha Sha ◽  
Anqi Geng ◽  
Yuqin Gao ◽  
Bin Li ◽  
Xuewei Jiang ◽  
...  
Keyword(s):  
Physical Models ◽  
Spring Model ◽  
Finite Element Analyses ◽  
Knitted Fabrics ◽  
Piecewise Function ◽  
Fabric Structure ◽  
Weft Knitted Fabric ◽  
Mass Spring Model ◽  
Virtual Display ◽  
Mass Spring

There are different kinds of geometrical models and physical models used to simulate weft knitted fabrics nowadays, such as loop models based on Pierce, piecewise function, spline curve, mass-spring model, and finite element analyses (FEA). Weft knitting simulation technology, including modeling and yarn reality, has been widely adopted in fabric structure designing for the manufacturer. The technology has great potentials in both industries and dynamic virtual display. The present article is aimed to review the current development of 3-D simulation technique for weft knitted fabrics.

scholarly journals Effect of time complexities and variation of mass spring model parameters on surgical simulation

2014 ◽  
Vol 9 (4) ◽  
Author(s):  
Salina Sulaiman ◽  
Tan Sing Yee ◽  
Abdullah Bade
Keyword(s):  
Soft Tissue ◽  
Human Liver ◽  
Soft Tissues ◽  
Surgical Simulation ◽  
Model Parameters ◽  
Spring Model ◽  
Surgical Simulator ◽  
Tissue Model ◽  
Mass Spring Model ◽  
Mass Spring

Physically based models assimilate organ-specific material properties, thus they are suitable in developing a surgical simulation. This study uses mass spring model (MSM) to represent the human liver because MSM is a discrete model that is potentially more realistic than the finite element model (FEM). For a high-end computer aided medical technology such as the surgical simulator, the most important issues are to fulfil the basic requirement of a surgical simulator. Novice and experienced surgeons use surgical simulator for surgery training and planning. Therefore, surgical simulation must provide a realistic and fast responding virtual environment. This study focuses on fulfilling the time complexity and realistic of the surgical simulator. In order to have a fast responding simulation, the choice of numerical integration method is crucial. This study shows that MATLAB ode45 is the fastest method compared to 2nd ordered Euler, MATLAB ode113, MATLAB ode23s and MATLAB ode23t. However, the major issue is human liver consists of soft tissues. In modelling a soft tissue model, we need to understand the mechanical response of soft tissues to surgical manipulation. Any interaction between haptic device and the liver model may causes large deformation and topology change in the soft tissue model. Thus, this study investigates and presents the effect of varying mass, damping, stiffness coefficient on the nonlinear liver mass spring model. MATLAB performs and shows simulation results for each of the experiment. Additionally, the observed optimal dataset of liver behaviour is applied in SOFA (Simulation Open Framework Architecture) to visualize the major effect.

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