(1. 蘭州理工大學(xué) 有色金屬合金及加工教育部重點(diǎn)實(shí)驗(yàn)室，蘭州 730050；2. 蘭州理工大學(xué) 甘肅省有色金屬新材料省部共建國(guó)家重點(diǎn)實(shí)驗(yàn)室，蘭州 730050)
摘 要: 利用熔池圖像視覺傳感系統(tǒng)和相應(yīng)的圖像處理算法建立脈沖電流占空比與正面熔寬的階躍響應(yīng)模型，在熔寬變化給定量分別為3、4和5 mm的情況下對(duì)模糊控制器和遺傳算法優(yōu)化的PID控制器的控制效果進(jìn)行仿真。仿真結(jié)果表明：為了使PID控制器取得最佳控制效果在不同誤差條件下需采用不同的參數(shù)，而模糊控制器在結(jié)構(gòu)和參數(shù)不變的情況下對(duì)不同誤差均可得到良好的控制效果。該研究結(jié)果為鋁合金脈沖MIG焊熔寬控制系統(tǒng)的設(shè)計(jì)提供了理論依據(jù)，實(shí)驗(yàn)表明控制系統(tǒng)工作有效。
關(guān)鍵字: 鋁合金；MIG焊；閉環(huán)控制；仿真
（1. Key Laboratory of Non-ferrous Metal Alloys, Ministry of Education,Lanzhou University of Technology, Lanzhou 730050, China;2. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,Lanzhou University of Technology, Lanzhou 730050, China）
Abstract:On the basis of welding pool image vision sensing and processing system, the identification model of welding pool width dynamic response in aluminum alloy pulsed MIG welding process was setup. And then, in the case that welding pool width reference input value was 3, 4 and 5 mm respectively, the genetic arithmetic optimized PID control and the fuzzy control effect were simulated and analyzed. The results of simulation show that good effect can be obtained by using either PID controller or fuzzy controller, but the PID controller must adopt different parameters in different reference input values, while the fuzzy controller only uses the same structure and parameters. A good base for the future work on design of control system for aluminum alloy MIG welding pool width is built. Good result is obtained in welding experiment
Key words: aluminum alloy; MIG welding; closed-loop control; simulation
