scholarly journals Time domain identification of continuous-time systems with time delay using output error method from sampled data

2011 ◽  
Vol 44 (1) ◽  
pp. 9041-9046 ◽  
Author(s):  
A. Baysse ◽  
F.J. Carrillo ◽  
A. Habbadi
Keyword(s):  
Time Delay ◽  
Time Domain ◽  
Continuous Time ◽  
Sampled Data ◽  
Domain Identification ◽  
Output Error ◽  
Continuous Time Systems ◽  
Time Systems ◽  
Error Method

scholarly journals Improvement of the Asymptotic Properties of Zero Dynamics for Sampled-Data Systems in the Case of a Time Delay

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Cheng Zeng ◽  
Shan Liang ◽  
Jiaqi Zhong ◽  
Yingying Su
Keyword(s):  
Time Delay ◽  
Continuous Time ◽  
Order Term ◽  
Power Series Expansion ◽  
Relative Degree ◽  
Zero Dynamics ◽  
Sampled Data ◽  
Major Barrier ◽  
Continuous Time Systems ◽  
Time Systems

It is well known that the existence of unstable zero dynamics is recognized as a major barrier in many control systems, and deeply limits the achievable control performance. When a continuous-time system with relative degree greater than or equal to three is discretized using a zero-order hold (ZOH), at least one of the zero dynamics of the resulting sampled-data model is obviously unstable for sufficiently small sampling periods, irrespective of whether they involve time delay or not. Thus, attention is here focused on continuous-time systems with time delay and relative degree two. This paper analyzes the asymptotic behavior of zero dynamics for the sampled-data models corresponding to the continuous-time systems mentioned above, and further gives an approximate expression of the zero dynamics in the form of a power series expansion up to the third order term of sampling period. Meanwhile, the stability of the zero dynamics is discussed for sufficiently small sampling periods and a new stability condition is also derived. The ideas presented here generalize well-known results from the delay-free control system to time-delay case.

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