激光焊接过程的非线性辨识和自适应控制  

Nonlinear Identification and Adaptive Control of Laser Welding Process

作　　者：温慧婷[1] 刘玉生[1] 刘美峰[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065

出　　处：《计算机仿真》2010年第11期295-298,共4页Computer Simulation

基　　金：国家自然科学基金国际合作项目(60540420641)

摘　　要：针对提高焊接质量控制问题,采用激光技术。激光焊接过程的数学模型具有较强的非线性,一般的线性辨识方法无法得到它的精确模型。对激光焊接过程非线性系统难于建模和难于控制的问题,首先提出了基于夏氏法的非线性辨识方法,辨识出了具有典型非线性的焊接过程模型。为保证识别精度,提出了自适应滑动平均控制器的设计方法。经过仿真实验,结果表明了辨识方法和控制方法的有效性,通过自适应控制方法可以保证激光焊接过程跟踪指定的期望值,并具有控制算法简单,控制精度高和抗干扰能力强等优点。Mathematical model of laser welding process is a stronger nonlinear mathematical model and the usual identification methods for linear system cannot get accurate model.In order to solve the difficulties of modeling and controlling of nonlinear system in the laser welding process,firstly,the T.C.Hsia method based on nonlinear identification is presented in this paper and the welding model of representative nonlinear characteristics is obtained.On the basis of this model,the Adaptive Moving Average Control is introduced.The simulation results show that the identification method and the control method are effective,and the output of process can track the desired signal in using this Adaptive Control method.The control method is simple,precise and robust to disturbances.

关 键 词：非线性系统 辨识 自适应滑动平均法 激光焊接过程 

分 类 号：TH128[机械工程—机械设计及理论]