Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (06): 63-69.doi: 10.13475/j.fzxb.20210701808

• Textile Engineering • Previous Articles     Next Articles

Deformation prediction and simulation of weft knitted fabrics with non-uniform density distribution

RU Xin1,2, ZHU Wanzhen1,2, SHI Weimin1,2(), PENG Laihu1,2,3   

  1. 1. College of Mechanical and Automatic Control, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Key Laboratory of Modern Textile Machinery & Technology of Zhejiang Province, Zhejiang Sci-Tech University,Hangzhou, Zhejiang 310018, China
    3. Research Institute of Zhejiang Sci-Tech University in Longgang Co., Ltd.,Wenzhou, Zhejiang 325802, China
  • Received:2021-07-06 Revised:2022-03-18 Online:2022-06-15 Published:2022-07-15
  • Contact: SHI Weimin E-mail:swm@zstu.edu.cn

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Abstract:

Aiming at the problem of obvious deformation of the finished fabric formed by the combination of weft knitted fabric stitches of different densities and the difficulty in predicting the finished product effect, a deformation prediction and simulation method of the weft knitted fabrics with non-uniform distribution of density was proposed. Based on the specific distribution of different constituent fabric stitches in the fabric, the method of determining the initial state of the corresponding fabric spring-mass point model was employed, based on which the stress analysis of the mass point and the corresponding mechanical differential equations were established, and the position of the mass point was obtained by solving the mechanical differential equations numerically. The NURBS loop model was established based on the two-dimensional Peirce loop model, and the relationship between the control vertex and the fabric loop distance and height was determined to further establish the mass point-control point correlation equation. The position of the mass point after the force shift was substituted into the mass point-control point correlation equation to realize the deformation simulation of weft knitted fabrics with non-uniform density distribution of curved loop. The fabric simulation map was compared with the practical knitted fabrics, and the results show that the simulation effect is reliable.

Key words: density, weft knitted fabric, deformation prediction, spring-mass model, fabric simulation

CLC Number: 

  • TS186.2

Fig.1

Simulation process of fabric deformation. (a) Fabric density distribution ;(b) Initial state of spring-mass model of fabric; (c) Mesh deformation diagram of fabric; (d) Loop-mesh model ;(e) Deformation simulation of fabric with non-uniform density distribution; (f) Physical picture of a fabric with non-uniform density distribution"

Fig.2

Main research process"

Fig.3

Two-dimensional mesh of fabric. (a) Physical picture of weft plain fabric; (b) Fabric mesh"

Fig.4

Spring-mass model"

Fig.5

Coordinate and dimensional diagram of individual loop"

Fig.6

Spring-mass model of fabric. (a) Fabric mesh; (b) Initial state of spring-mass model of fabric"

Fig.7

Force analysis diagram of mass"

Fig.8

Loop model. (a) Peirce loop model;(b) NURBS loop model"

Fig.9

Diagram of longitudinal cascade relationship of loops"

Fig.10

Loop-mesh model. (a) Ideal style of loop;(b) Deformed loop"

Tab.1

Value of scale factor of control point of loop"

类型 P0 P1 P2 P3 P4 P5 P6 P7 P8 P9
kx,i 0 0.3 0.4 0.1 0.2 0.8 0.9 0.6 0.7 1
ky,i 0 0 0.47 1.53 1.88 1.88 1.53 0.47 0 0

Fig.11

Physical picture of sample. (a) Sample 1; (b) Sample 2"

Tab.2

Fabric specification parameters"

样品编号 纱线原料 总纵行数 总横列数 组织类型 成员组织尺寸 密度
纵行数 横列数 横密/
(纵行·(5 cm)-1)		 纵密/
(横列·(5 cm)-1)
平针组织1 30 10 9 17
1 39.37 tex×7腈纶 30 30 平针组织2 30 10 8 13
平针组织3 30 10 6.5 11
2 39.37 tex×7腈纶 30 30 平针组织2 14 14 8 13
平针组织3 - - 6.5 11

Tab.3

Partial information of fabric simulation on computer"

织物
样式		 织物总
横列数		 织物总
纵行数		 仿真时间
(步长)/s		 仿真迭代
次数		 仿真时
间/min
样品1 60 102 0.12 200 4
样品2

Fig.12

Simulation diagram of sample. (a) Sample 1; (b) Sample 2"

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