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CO2焊不同过渡形态下电流信号的近似熵分析
引用本文:吕小青,林建平,曹彪,曾敏,黄石生. CO2焊不同过渡形态下电流信号的近似熵分析[J]. 焊接学报, 2008, 29(7): 17-21
作者姓名:吕小青  林建平  曹彪  曾敏  黄石生
作者单位:1. 同济大学机械工程学院,上海,200092
2. 华南理工大学机械工程学院,广州,510640
基金项目:国家自然科学基金资助项目
摘    要:介绍了非线性参量近似熵的理论及算法,提出由近似熵的角度分析CO2焊不同过渡形态下稳定性的思想.在合适的参数匹配条件下,逐渐增大送丝速度,使过渡过程依次出现稳定的短路过渡、瞬时短路过渡以及潜弧过渡时,通过计算其电流信号的近似熵大小及方差来研究CO2焊过程稳定性的特征.结果表明,在不同的过渡形态下,近似熵可作为焊接过程稳定性的评判标准,即近似熵越大、方差越小,焊接过程就越稳定.完善了近似熵作为稳定性评判标准的理论,促进该理论进一步的应用.

关 键 词:近似熵  稳定性  过渡形态
收稿时间:2008-01-12

Approximate entropy analysis of current signal in different transfer modes of CO2 arc welding
L,#; Xiaoqing,LIN Jianping,CAO Biao,ZENG Min and HUANG Shisheng. Approximate entropy analysis of current signal in different transfer modes of CO2 arc welding[J]. Transactions of The China Welding Institution, 2008, 29(7): 17-21
Authors:L&#   Xiaoqing,LIN Jianping,CAO Biao,ZENG Min  HUANG Shisheng
Affiliation:College of Mechanical Engineering, Tongji University, Shanghai 200092, China,College of Mechanical Engineering, Tongji University, Shanghai 200092, China,College of Mechaical Engineering, South China University of Technology, Guangzhou 510640, China,College of Mechaical Engineering, South China University of Technology, Guangzhou 510640, China and College of Mechaical Engineering, South China University of Technology, Guangzhou 510640, China
Abstract:The theory and related algorithm of the nonlinear parameter approximate entropy are introduced.An idea for analysing the arc stability in different transfer modes of CO2 welding based on approximate entropy is put forward.With matching appropriate parameters and increasing wire feed speed, the transfer modes are found as follow :short circuit transfer, instantaneous short circuit transfer and buried arc transfer.Through calculating the value and standard deviation of approximate entropy of current in different transfer modes, the characters between approximate entropy and arc stability in CO2 welding are studied.Approximate entropy of current signal can be taken as a criterion of arc stability in different transfer modes.The greater approximate entropy and less fluctuation indicate a more stable welding process.The approximate entropy theory as a criterion of arc stability is further perfected.
Keywords:approximate entropy  stability  transfer modes
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