基于ITAE的铝合金MIG焊熔宽控制仿真  

Simulation of aluminum alloy MIG welding pool width control based on ITAE criterion

作　　者：樊丁[1] 张刚[2] 黄健康[1] 石玗[2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验,甘肃兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验,甘肃兰州730050

出　　处：《电焊机》2012年第10期1-4,共4页Electric Welding Machine

基　　金：国家自然科学基金资助项目(50805073);国家自然基金资助项目(51165023)

摘　　要：针对铝合金MIG焊过程的复杂多变性,在已建立的脉冲电流占空比与焊接正面熔宽之间的动态阶跃响应辨识数学模型基础上,设计基于ITAE准则的自整定优化PID控制器,对铝合金MIG焊占空比对熔池正面宽度动态响应控制效果进行了仿真研究,并研究控制系统在随机干扰信号作用下单位阶跃响应的鲁棒性,与增量式PID控制器和鲁棒极点配置控制器的控制效果进行了对比分析。结果表明,基于ITAE准则的自整定优化PID控制器在能够满足控制精度要求的同时,也具有较快的响应速度,较好的稳定性和鲁棒性,为更好地实现铝合金MIG焊熔宽实时控制提供了理论基础。Aimed at the complication and variation of aluminum alloy MIG wehting process, the dynamic order step response mathematical model of identified by pulse-electric duty ratio and positive width data had been set up.The most optimism PID controller which was based on ITAE criterion was designed for controlling aluminum MIG welding pool width.Then the PID controller, pole-placement controller and this controller were respectively used to simulate the aluminum alloy MIG welding pool width control system, compared and analyzed the results of simulation using these controllers. Besides the robustness of control system was analyzed when the system was disturbed by random signals.It was shown by the simulation that a faster reflect speed, stead-state performance and better robust process could be obtained for the MIG welding of aluminum alloy with the most optimism PID controller based on ITAE criterion.

关 键 词：铝合金MIG焊 ITAE准则 熔宽控制 仿真 

分 类 号：TG434.5[金属学及工艺—焊接]