中国物理B ›› 2017, Vol. 26 ›› Issue (5): 50201-050201.doi: 10.1088/1674-1056/26/5/050201

• GENERAL •    下一篇

Using wavelet multi-resolution nature to accelerate the identification of fractional order system

Yuan-Lu Li(李远禄), Xiao Meng(孟霄), Ya-Qing Ding(丁亚庆)   

  1. 1 B-DAT, School of Information and Control, Nanjing University of Information Science & Technology, Nanjing 210044, China;
    2 Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 收稿日期:2016-09-21 修回日期:2017-02-07 出版日期:2017-05-05 发布日期:2017-05-05
  • 通讯作者: Yuan-Lu Li E-mail:lyl_nuist@nuist.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61271395) and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20161513).

Using wavelet multi-resolution nature to accelerate the identification of fractional order system

Yuan-Lu Li(李远禄)1,2, Xiao Meng(孟霄)2, Ya-Qing Ding(丁亚庆)2   

  1. 1 B-DAT, School of Information and Control, Nanjing University of Information Science & Technology, Nanjing 210044, China;
    2 Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • Received:2016-09-21 Revised:2017-02-07 Online:2017-05-05 Published:2017-05-05
  • Contact: Yuan-Lu Li E-mail:lyl_nuist@nuist.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61271395) and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20161513).

摘要: Because of the fractional order derivatives, the identification of the fractional order system (FOS) is more complex than that of an integral order system (IOS). In order to avoid high time consumption in the system identification, the least-squares method is used to find other parameters by fixing the fractional derivative order. Hereafter, the optimal parameters of a system will be found by varying the derivative order in an interval. In addition, the operational matrix of the fractional order integration combined with the multi-resolution nature of a wavelet is used to accelerate the FOS identification, which is achieved by discarding wavelet coefficients of high-frequency components of input and output signals. In the end, the identifications of some known fractional order systems and an elastic torsion system are used to verify the proposed method.

关键词: fractional order system, system identification, operational matrix, wavelet multi-resolution analysis

Abstract: Because of the fractional order derivatives, the identification of the fractional order system (FOS) is more complex than that of an integral order system (IOS). In order to avoid high time consumption in the system identification, the least-squares method is used to find other parameters by fixing the fractional derivative order. Hereafter, the optimal parameters of a system will be found by varying the derivative order in an interval. In addition, the operational matrix of the fractional order integration combined with the multi-resolution nature of a wavelet is used to accelerate the FOS identification, which is achieved by discarding wavelet coefficients of high-frequency components of input and output signals. In the end, the identifications of some known fractional order systems and an elastic torsion system are used to verify the proposed method.

Key words: fractional order system, system identification, operational matrix, wavelet multi-resolution analysis

中图分类号:  (Partial differential equations)

  • 02.30.Jr
02.60.Cb (Numerical simulation; solution of equations) 05.40.Ca (Noise) 05.45.-a (Nonlinear dynamics and chaos)