纺织学报 ›› 2020, Vol. 41 ›› Issue (11): 150-155.doi: 10.13475/j.fzxb.20200301506

• 机械与器材 • 上一篇    下一篇

纬编针织机织针自由状态下固有频率测试方法

戴宁, 彭来湖(), 胡旭东, 崔英, 钟垚森, 王越峰   

  1. 浙江理工大学 浙江省现代纺织装备技术重点实验室, 浙江 杭州 310018
  • 收稿日期:2020-03-06 修回日期:2020-07-29 出版日期:2020-11-15 发布日期:2020-11-26
  • 通讯作者: 彭来湖
  • 作者简介:戴宁(1991—),男,博士生。主要研究方向为针织装备控制技术。
  • 基金资助:
    国家重点研发计划资助项目(2017YFB1304000)

Method for testing natural frequency of weft knitting needles in free state

DAI Ning, PENG Laihu(), HU Xudong, CUI Ying, ZHONG Yaosen, WANG Yuefeng   

  1. Key Laboratory of Modern Textile Machinery & Technology of Zhejiang Province, Zhejiang Sci-Tech University,Hangzhou, Zhejiang 310018, China
  • Received:2020-03-06 Revised:2020-07-29 Online:2020-11-15 Published:2020-11-26
  • Contact: PENG Laihu

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摘要：

针对现有纬编针织机织针由于其结构尺寸微小、细长、横截面直径不定等特性带来的在其自由状态下织针的各阶模态特性难以测试的问题,提出采用小面积、低质量的锆钛酸铅压电陶瓷(PZT)贴于织针表面,形成PZT、织针黏合体结构。采用高性能阻抗分析仪对黏合体进行扫频测试,根据不同频率下复阻抗以及相位角曲线,得出PZT自由状态下的各阶模态。采用ANSYS有限元仿真软件对织针以及黏合体的各阶模态进行对比认证,并采用悬臂梁曲率、挠度理论以及织针振动理论进行分析。理论推算以及仿真测试结果表明,该实验测试方法能有效测试纬编针织机织针自由状态下的固有频率。

关键词: 纬编针织机, 织针, 复阻抗曲线, 相位角曲线, ANSYS有限元仿真, 振动特性

Abstract:

The natural frequency characteristics of knitting needles on weft knitting machines are closely related to the property of weft knitting machines. The existing weft knitting machine knitting needles are small, slender, and have variable cross-sectional diameter in their free state, and the characteristics of the knitting needles at various stages are difficult to test. This research made use of a small and low-quality piezoelectric zirconate titanate ceramics (PZT) attached to the surface of the knitting needle to form an adhesive body structure. A high-performance impedance analyzer was used to perform a frequency sweep test on the bonded body. According to the complex impedance and phase angle curves at different frequencies, the modes of each order in the PZT free state were obtained. ANSYS finite element simulation software was used to compare and verify each mode of knitting needles and bonded bodies, and analysis was performed based on the cantilever curvature, deflection theory, and knitting needle vibration theory. The results of theoretical calculation and simulation test show that this experimental test method is able to measure effectively the natural frequency of the needles in the free state.

Key words: weft knitting machine, knitting needle, complex impedance curve, phase angle curve, ANSYS finite element simulation, vibration characteristic

中图分类号: 

  • TS103.7

图1

纬编针织机成圈过程织针运动简图"

图2

织针固有频率总体设计方案简图"

图3

黏合体剖面结构图"

图4

实验连接图"

图5

阻抗分析仪测量黏合体固有频率原理"

图6

复阻抗-频率与角度-频率曲线图"

图7

弯曲时织针表面曲率示意图"

表1

试样1,2前3阶频率统计表"

试样编号 一阶频率 二阶频率 三阶频率
1 342.4 734.0 957.8
2 361.1 790.0 976.5

图8

织针前3阶模态分析结果图"

表2

织针仿真与测试结果误差结果汇总"

模态 仿真
频率/
Hz		 实验1 实验2
测试
频率/Hz		 测试
误差/%		 测试
频率/Hz		 测试
误差/%
1 383.1 342.4 10.6 361.1 5.7
2 896.7 734.0 18.1 790.0 11.9
3 1 019.0 957.8 6.0 976.5 4.2

图9

黏合体前3阶模态分析结果图"

表3

黏合体仿真与测试结果误差结果汇总"

模态 仿真
频率/
Hz		 实验1 实验2
测试
频率/Hz		 测试
误差/%		 测试
频率/Hz		 测试
误差/%
1 382.0 342.4 10.4 361.1 5.5
2 885.5 734.0 17.1 790.0 10.8
3 986.4 957.8 2.9 976.5 1.0
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