Journal of Applied Mathematics

  • J. Appl. Math.
  • Volume 2013, Special Issue (2013), Article ID 268684, 16 pages.

Improving the Asymptotic Properties of Discrete System Zeros in Fractional-Order Hold Case

Cheng Zeng, Shan Liang, and Yingying Su

Full-text: Open access

Abstract

Remarkable improvements in the asymptotic properties of discrete system zeros may be achieved by properly adjusted fractional-order hold (FROH) circuit. This paper analyzes asymptotic properties of the limiting zeros, as the sampling period T tends to zero, of the sampled-data models on the basis of the normal form representation of the continuous-time systems with FROH. Moreover, when the relative degree of the continuous-time system is equal to one or two, an approximate expression of the limiting zeros for the sampled-data system with FROH is also given as power series with respect to a sampling period up to the third-order term. And, further, the corresponding stability conditions of the sampling zeros are discussed for fast sampling rates. The ideas of the paper here provide a more accurate approximation for asymptotic zeros, and certain known achievements on asymptotic behavior of limiting zeros are shown to be particular cases of the results presented.

Article information

Source
J. Appl. Math., Volume 2013, Special Issue (2013), Article ID 268684, 16 pages.

Dates
First available in Project Euclid: 14 March 2014

Permanent link to this document
https://projecteuclid.org/euclid.jam/1394806098

Digital Object Identifier
doi:10.1155/2013/268684

Zentralblatt MATH identifier
06950591

Citation

Zeng, Cheng; Liang, Shan; Su, Yingying. Improving the Asymptotic Properties of Discrete System Zeros in Fractional-Order Hold Case. J. Appl. Math. 2013, Special Issue (2013), Article ID 268684, 16 pages. doi:10.1155/2013/268684. https://projecteuclid.org/euclid.jam/1394806098


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