Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (05): 167-175.doi: 10.13475/j.fzxb.20181104809

• Machinery & Accessories • Previous Articles     Next Articles

Knitting machine information modeling under OPC unified architecture framework

WANG Songsong1,2(), PENG Laihu2, HU Xudong2   

  1. 1. School of International Education, 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
  • Received:2018-11-19 Revised:2020-02-24 Online:2020-05-15 Published:2020-06-02

Abstract:

In order to overcome problems in low semantic integrity of data caused by fragmentation and semi-structured and heterogeneous information in knitting machine information interaction, a method for constructing knitting machine information model under OPC unified architecture (UA) framework was proposed. In this research, three-dimensional structured semantic information of knitting machine was established, and a formal information modeling process was design. The knitting machine information model was created for an overall model of digital knitting workshop and knitting machine structure, including attribute set, component set, configuration information and other structures, and the information from the data change frequency, data priority, correlation and other aspects of knitting machine were analyzed and optimized. By establishing OPC UA modeling technology implementation process and identifying knitting machine characteristics, the research studied the implementation mode of OPC UA service system for knitting machine, and an independent server of knitting OPC UA information model was developed by using UaExpert SDK. The interconnection of knitting machine information model was tested. The results indicate that the method for constructing knitting machine information model based on OPC UA framework is feasible. The method used for this research improves model architecture, semantic structure and technology implementation, and demonstrates characteristics of high semantic completeness.

Key words: knitting machine, information model, OPC unified architecture, attribute set

CLC Number: 

  • TH186

Fig.1

Equipment information model infrastructure"

Fig.2

Knitting workshop information model structure"

Fig.3

Mapping of knitting machine and OPC UA information model elements"

Fig.4

Evolution of knitting machine semantic information model construction"

Fig.5

Knitting machine information model"

Fig.6

Knitting machine attribute element structure"

Tab.1

Typical properties of knitting machine"

属性 隶属属性集 属性ID 属性名称 访问权限 属性值类 低限值 高限值
设备编号 基础静态属性集 0x10010006 machine_ID 字符串型
状态 生产过程属性集 0x20010002 machine_state 整型 0 10
当前速度 生产过程属性集 0x20020004 cur_speed 整型 0 100
设定速度 生产过程属性集 0x20020005 set_speed 读/写 整型 0 100
产量 生产过程属性集 0x20030003 product_quantity 实型 0
打卡时间 生产过程属性集 0x20070012 card_time 读/写 时间戳型

Fig.7

Improved knitting machine attribute element structure"

Fig.8

Server structure of knitting machine information model"

Fig.9

OPC UA independent system"

Fig.10

Knitting machine information model OPC UA"

Tab.2

Characteristics comparison of knitting machine information model"

序号 模型评价因子 碎片化信息点 单纯OPC UA模型 本论文中改进的信息模型
1 建模方法 形式化建模
2 模型结构 网状结构 树状结构、网状结构(属性元素实现)
3 信息节点关系度 定性关系 定量关系
4 模型变化灵活度 人工再开发 自动演进
5 可实施的语义维度 1维(仅数值数据) 3维 3维
6 信息节点语义属性元素规模 8项 11项
7 语义字典 有,固定模式 有,语义非常丰富
8 模型语义完备度 碎片化,不完备 固定模型 覆盖针织装备所有语义服务
9 建模效率 人工,低 自动化,高
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