| 摘要: |
| 焊接电流和电弧长度是熔化极气体保护焊(GMAW)焊接过程的主要状态变量,决定了熔滴的过渡过程、热量输入和焊缝成形.文中在分析GAMW焊接工艺过程的基础上,建立了焊接电流和电弧长度的数学模型,采用基于二次型性能指标的直接自适应控制算法,通过调节焊接电源输出电压和送丝速度的大小,使焊接电流和电弧长度能跟踪参考模型的输出.同时,针对实际应用中难以检测的电弧长度,建立了电弧长度估计模型,实现了对电弧长度的软测量.结果表明,该算法可以实现弧长和电流的精确控制. |
| 关键词: 熔化极气体保护焊 直接自适应控制 弧长估计 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Direct model reference adaptive control of gas metal arc welding process |
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ZHANG Tao, GUI Weihua, WANG Suiping
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Information Science and Engineering Institute, Central South of University, Changsha 410083, China
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| Abstract: |
| Welding current and arc length will determine the metal transfer,heat input and weld appearance for gas metal arc welding (GMAW).The mathematical model of welding current and arc length is present through the analysis of GMAW welding process,a direct model reference adaptive control based on the quadratic performance index for the GMAW process is designed,and welding current and arc length are controlled by adjusting of welding power source voltage and wire feed speed to trace the output of the reference model.At the same time,an estimation model is given for indirect measurement of the arc length,which is difficult to detect in the application.The results of simulation show the validity of the control method. |
| Key words: gas metal arc welding direct model reference adaptive control arc length estimation |
