RBF—ARX模型在液位系统建模中的应用  

Modeling of nonlinear liquid-level system using RBF-ARX model

作　　者：任林[1] 彭辉[1] 

机构地区：[1]中南大学 信息科学与工程学院,湖南长沙410083

出　　处：《计算机测量与控制》2007年第8期1023-1026,共4页Computer Measurement &Control

基　　金：国家自然科学基金(60443008)。

摘　　要：针对单容液位系统紊流时的非线性特征,采用RBF—ARX模型对单容液位系统进行离线动态特性建模的研究;分别在液位高中低三个工作点建立了其局部线性ARX模型,它们的单位阶跃响应存在巨大差异,证实了整个系统具有较强的非线性;讨论了RBF—ARX模型结构的选取,模型参数辨识,RBF参数优化等问题;模型的预测输出和仿真结果,证实了RBF—ARX模型在非线性系统建模和辨识中的有效性。This paper focuses on the modeling of liquid-level system involving turbulent flow in a single water tank device by using RBF-ARX model. The dynamic global RBF-ARX and local linear ARX models at high, middle and low level working point are built respectively. The system nonlinearity is shown by the differences of the unit responses to the three local ARX models. Emphasis is also put on the design of the structure of RBF-ARX model, identification, parameter optimization and so on. The results of simulation studies finally show the effectiveness of RBF-ARX model for the modeling and identification of nonlinear systems.

关 键 词：液位系统 水箱 非线性系统 建模 RBF-ARX模型 

分 类 号：TP271.62[自动化与计算机技术—检测技术与自动化装置]