Time Delay Estimation and Adaptive Control of Networked Control Systems
-
摘要: 提出了基于最小二乘支持向量机(LS-SVM)的网络时延预估网络控制系统(NCS)的自适应预测控制方法.先将网络时延转化为非线性时间序列,再用径向基函数(RBF)作为LS-SVM的核函数,建立NCS的时延预测模型.用通过该模型预测的时延设计自适应控预测制器,补偿和控制NCS的时延.仿真结果表明,该时延预测方法对NCS的随机时变时延有较高的预测精度,根据预测的时延设计的控制器能使系统的输出很好地跟踪期望的输出.Abstract: A novel approach for predictive control of an NCS (networked control system) was proposed.To derive the model for prediction of time delays in an NCS, the time delays were transformed into a nonlinear time series, and a RBF (radial basis function) was taken as the kernel function of LS-SVM (least square support vector machine).An adaptive predictive control algorithm was designed according to the delays predicted with the model to compensate the time delays.Simulation results show that the proposed method has good performances in time delay prediction of the NCS, and the output of the controller designed based on the predicted time delay can trace the desired output precisely.
-
Key words:
- NCS /
- least square /
- SVM /
- time delay estimation /
- adaptive control
-
RICHARD Z.Special issue on industrial communication systems[J].Proceedings of the IEEE,2005,93 (6):1 067-1 072.[2] GOODWIN G C,HAIMOVICH H,QUEVEDO D E,et al.A moving horizon approach to networked control system design[J].IEEE Transactions on Automatic Control,2004,49(9):1 427-1 445.[3] BUSHNELL L G.Network and control[J].IEEE Control System Magazine,2001,21(1):22-23.[4] 索格罗,阳宪惠.控制系统中的网络传输延迟预估控制[J].清华大学学报(自然科学版),2005,45(4):536-539.SOGLO A B,YANG Xianhui.Estimate control with network-induced delay in control systems[J].Journal of Tsinghua University (Science and Technology),2005,45 (4):536-539.[5] HALEVI Y,RAY A.Performance analysis of integrated communication and control systen networks[J].Journal of Dynamic Systems,Measurement,and Control,1990,112(3):365-371.[6] VAPNIK V.Statistical Learning Theory[M].New York:John Wiley,1998.[7] SUKENS J A K,VANDEWALLE J.Least squares support vector machines classifiers[J].Neural Processing Letters,1999,9(3):293-300.[8] IETF RFC 2544.RFC2544-benchmarking methodology for network interconnect devices[S].2006.[9] TAKENS F.Determing strange attractors in turbulence[C]// Dynamical Systems and Turbulence,Lecture Notes in Mathematics.Berlin:Springer-Verlag,1981:366-381.[10] ASTROM K J,WITTENMARK B.Adaptive Control[M].Second Edition.Beijing:Science Press,2003:53-54.[11] ANDERSSON M,HENRIKSSON D,CERVIN A.TureTime 1.3-reference manual[R].Sweden:Department of Automatic Control,Lund Institute of Technology,2005. -
点击查看大图
计量
- 文章访问数: 1554
- HTML全文浏览量: 73
- PDF下载量: 447
- 被引次数: 0
下载: