摘要
研制了一种以 80C196KC数字单片机为核心器件 ,通过软件方式实现CO2 短路过渡焊电压与电流自动形成最优匹配的智能控制系统 .系统通过PID(P为比例 ,I为微分 ,D为积分 )参数自适应模糊控制器 ,可维持所选定电流不变 .同时 ,系统采用优选法 ( 0 .618法 )和变步长法相结合的分段寻优控制器 ,实现以最高短路过渡频率为目标的电弧电压自寻优 .实验证明 :当焊接电流在 110～ 2 2 0A范围内时 ,经智能系统控制后的CO2 焊短路过渡频率较控制前要高 ;寻优后的电弧电压与稳定后的电流形成最优匹配 ,达到了稳定熔滴过渡过程、减少飞溅、改善成形的目的 .
An intelligent control system with single chip 80C196KC is developed. The system is used for the optimized matching of welding arc voltage and current for the carbon dioxide short-circuit metal transfer welding. The control software is programmed and used for the system. With the PID self- adjusting fuzzy unit, the system can keep the current constant, which is set initially by the welding operator. The system employs the combined 0.618 optimizing method with one-dimensional searching method to search the optimum arc voltage and to achieve the target of highest transition frequency with changeable steps. The experiment has proved that carbon dioxide short-circuit metal transfer frequency is higher than that without intelligent control in the range of 110～220 A welding current. The optimized arc voltage matches well with the stablized welding current such that the droplet transition process is stabilized, the spatter is reduced and the weld formation is improved.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2001年第1期75-78,101,共5页
Journal of Xi'an Jiaotong University
关键词
PID参数自适应
模糊控制
自寻优
最优匹配
智能控制
PID self-adjusting control
fuzzy control
automatic search
optimal matching
intelligent control
