基于弧压反馈的叶片微束等离子焊接修复弧长跟踪控制  

Arc Length Tracking Control for Blade MPAW Repair Based on Arc Pressure Feedback

作　　者：母嘉恒 戴士杰[1,2] 李世博 肖洋[1,2] MU Jiaheng;DAI Shijie;LI Shibo;XIAO Yang(State Key Laboratory of Reliability and Intelligen ce of Electrical Equipment,Hebei University of Technology,Tianjin 300130,China;School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学省部共建电工装备可靠性与智能化国家重点实验室,天津300130 [2]河北工业大学机械工程学院,天津300130

出　　处：《热加工工艺》2024年第1期68-74,共7页Hot Working Technology

基　　金：国家重点研发计划项目(2019YFB1311104);河北省研究生创新资助项目(CXZZSS2021029)。

摘　　要：在损伤航空发动机涡轮叶片微束等离子增材修复过程中,多层堆焊后熔覆层面不平整导致凸起形貌产生,使得待修复表面与熔覆层上表面一致性差。提出一种基于弧压反馈的弧长跟踪控制方法,提高弧长稳定性,以解决上述问题。利用电弧电压信号间接表征电弧弧长,并提出变分模态分解与中位值平均滤波融合算法以去除噪声信号。在此基础上,设计一种变论域模糊PID与PID并联的控制器,调节焊枪的高度以实现弧压稳定,并进行仿真优化。最后搭建弧压采集与弧长控制平台,进行弧压信号去噪实验和表面凸起试片焊接实验。结果表明,此方法能显著提高弧长稳定性,且凸起表面与熔覆层上表面一致性好。In the process of micro-plasma additive repair of damaged aero-engine turbine blades,uneven surface of the cladding layer after multi-layer surfacing leads to formation of bulge morphology,which makes the surface to be repaired and the upper surface of the cladding layer have poor consistency.An arc length tracking control method based on arc pressure feedback was proposed to improve the arc length stability and solve the above problem.The arc voltage signal was used to indirectly characterize the arc length,and the algorithm which combines the variational mode decomposition and median average filtering was proposed to remove the noise signal.On this basis,a controller composed of variable universe fuzzy PID and PID was designed to adjust the height of the welding torch to achieve arc pressure stability,and the simulation optimization was carried out.Finally,a platform for arc voltage acquisition and arc length control was built to conduct the experiments of arc voltage signal denoising and welding for specimen with bulge.The results show that this method can significantly improve the stability of arc length,and the convex surface is consistent with surface the upper surface of cladding layer.

关 键 词：涡轮叶片 微束等离子焊接 变分模态分解 变论域模糊PID 

分 类 号：TG409[金属学及工艺—焊接]