DocumentCode :
893789
Title :
Refined design method for sampled-data control systems: the pseudo-continuous-time (PCT) control system design
Author :
Houpis, C.H.
Volume :
132
Issue :
2
fYear :
1985
fDate :
3/1/1985 12:00:00 AM
Firstpage :
69
Lastpage :
74
Abstract :
A refined design method, based upon known principles, is presented for the design of sampled-data SISO control systems. Based upon the Fourier analysis of a sampled signal and the Pad¿¿ approximation, a sampled-data system may be approximated by a pseudo-continuous-time (PCT) control system. This approximation of a sampled-data system permits the use of continuous-time domain methods for designing cascade and/or feedback controllers based upon step-response specifications. When the rules governing the use of the Pad¿¿ approximation and the Tustin transformation are satisfied, the PCT approach is a valuable technique for the design of sampled-data control systems, especially when the sampling time T is much smaller than 1 s. For T < 1 s, the accuracy needed in performing the calculations in the z-domain increases as T decreases. The same degree of accuracy is not required while designing the controller in the s-plane. A design technique based upon the use of the PCT system is presented along with examples. The associated controller implementation problems are discussed.
Keywords :
control system synthesis; sampled data systems; time-domain synthesis; Fourier analysis; Pade approximation; SISO control systems; Tustin transformation; continuous-time domain methods; pseudo-continuous-time control system; sampled-data control systems; step-response;
fLanguage :
English
Journal_Title :
Control Theory and Applications, IEE Proceedings D
Publisher :
iet
ISSN :
0143-7054
Type :
jour
DOI :
10.1049/ip-d.1985.0012
Filename :
4642291
Link To Document :
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