Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (02): 193-20.doi: 10.13475/j.fzxb.20200803708

• Machinery & Accessories • Previous Articles    

Transverse vibration characteristics of knitting needles in seamless underwear machines based on axial movement cantilever beam theory

DAI Ning1,2, PENG Laihu1(), HU Xudong1, ZHONG Yaosen1, QI Dongming2   

  1. 1. Key Laboratory of Modern Textile Machinery & Technology of Zhejiang Province, Zhejiang Sci-Tech University,Hangzhou, Zhejiang 310018, China
    2. College of Textile Science and Engineering(International Institute of Silk),Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2020-08-07 Revised:2020-11-04 Online:2021-02-15 Published:2021-02-23
  • Contact: PENG Laihu E-mail:laihup@zstu.edu.cn

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Abstract:

During the axial movement of the knitting needle in seamless underwear machines, the transverse vibration characteristics of the knitting needle are closely related to the performance of the knitting mechanism. However, there are few studies on the transverse vibration of knitting needles at this stage during the knitting process, hindering the improvement of stability of the seamless underwear machine in terms of vibration. In this paper, the vibration characteristics were theoretically studied with the knitting needle as an equivalence to an axially moving cantilever beam and the finite element calculation was carried out using ANSYS simulation software. The transverse vibration characteristics of the knitting needles were examined using a high-speed camera. The transverse vibration curve and dynamic frequency value calculated theoretically and by simulation demonstrates high level of resemblance with each other for the transverse vibration curve, and the maximum deviation of the dynamic frequency value is below 3.84%, The experimental results prove the existence of transverse vibration during the knitting process, and the frequency value obtained is consistent with the theoretical and simulation results, which implies the correctness of the theoretical and simulation modeling.

Key words: seamless underwear machine, knitting needle, axial movement cantilever beam, transverse vibration, ANSYS simulation software, high-speed camera

CLC Number: 

  • TS103.7

Fig.1

Three-dimensional model of knitting mechanism of seamless underwear machine"

Fig.2

Schematic diagram of cantilever beam model for knitting needle axial movement"

Fig.3

Transverse vibration curve of knitting needle rises along cam"

Fig.4

Transverse vibration curve of knitting needle descends along cam"

Fig.5

ANSYS simulation flowchart"

Fig.6

Diagram of load application characteristics and effect. (a) Speed load application characteristics; (b) Force load application characteristics; (c) Velocity load application effect; (d) Force load application effect"

Fig.7

Transverse vibration simulation curve of knitting needle during ascending along cam"

Fig.8

Transverse vibration simulation curve of knitting needle during descending along cam"

Tab.1

Transverse vibration frequency during ascending of knitting needle"

波峰位置 理论值/Hz 仿真值/Hz 相对偏差/%
1 496 482 2.82
2 481 470 2.29
3 466 456 2.15
4 450 441 2.00
5 434 419 3.46
6 417 401 3.84
7 401 388 3.24
8 384 370 3.65

Tab.2

Transverse vibration frequency during descending of knitting needle"

波峰位置 理论值/Hz 仿真值/Hz 相对偏差/%
1 380 370 2.63
2 388 382 1.55
3 402 390 2.99
4 414 402 2.90
5 425 413 2.82
6 436 424 2.75
7 448 436 2.68
8 458 444 3.06
9 470 456 2.98
10 481 468 2.70
11 492 480 2.44
12 503 490 2.58

Fig.9

Schematic diagram of vibration measurement platform (a)and vibration measurement process (b)"

Fig.10

Time domain (a) and frequency domain(b) characteristics of transverse vibration"

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