摘要
激光焊接涉及到复杂的物理和化学变化,是一个典型的非线性系统,用机理建模法很难得到系统的数学模型,通常采用基于输入输出数据的系统辨识方法来建模;为了得到未知参数的无偏估计,采用相关最小二乘法进行辨识建立激光焊接系统的双线性模型,并通过比较实际焊接系统的阶跃响应和模型的阶跃响应验证了模型的准确性和有效性;在此基础上,采用反馈线性化方法,对激光焊接系统设计了最小方差自适应控制器;仿真结果表明了该非线性自适应控制方法的有效性。
Laser welding is a typical nonlinear system which involves complex physical and chemical changes. It＇ s difficult to obtain the mathematical model of the system by mechanism. System identification method is usually adopted to get the model by using input--output da- ta. In order to get unbiased estimates for unknown parameters, Correlation--Least Square method is used to establish a bilinear model for the laser welding system. The accuracy and the effectiveness of the model are validated by comparing the step responses of the actual system and the model. Then a Minimum-Variance Adaptive controller is designed for the system based on feedback linearization. The simulation results show the effectiveness of the nonlinear adaptive control scheme.
出处
《计算机测量与控制》
CSCD
北大核心
2010年第5期1042-1045,共4页
Computer Measurement &Control
基金
国家自然科学基金国际合作项目(60540420641)
关键词
激光焊接
相关最小二乘法
非线性辨识
最小方差
自适应控制
laser welding
correlation--least square
nonlinear identification
minimum variance
adaptive control
