The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON SYSTEMS
Transactions ID Number: 27-601
Full Name: Unai Ugalde
Position: Ph.D. Candidate
Age: ON
Sex: Male
Address: La Casilla, 3. 48012 Bilbao
Country: SPAIN
Tel: 946014473
Tel prefix: +34
Fax: 946014305
E-mail address: unai.ugalde@ehu.es
Other E-mails: uugalde@euskalnet.net
Title of the Paper: Ripple-free Control Response by Using a Fractional Order Hold Device
Authors as they appear in the Paper: Unai Ugalde, Rafael Bárcena, Koldo Basterretxea
Email addresses of all the authors: unai.ugalde@ehu.es, rafa.barcena@ehu.es, koldo.basterretxea@ehu.es
Number of paper pages: 10
Abstract: In digital control, discrete-time signal reconstruction is usualy carried out by the zero-order hold (ZOH), although other options exist which exhibit interesting properties. A remarkable alternative is the fractional-order hold (FROH), which provokes no intersample ripple under steady state and, if properly tuned, can often place the discretized plant model z-domain zeros in more convenient locations than the ZOH. This zero placing technique, in turn, gives rise to closed-loop performance improvements for many cases. However, since it is formulated in the z-domain, it cannot anticipate continuous-time closed-loop behaviour. Besides, going through zero placement is burdensome, especially for high-order models. This work presents a new and simpler method which directly links the tuning of the FROH with some desired closed-loop features, bypassing zero placement. It is based on the frequency domain, which makes it possible to capture the continuous-time behaviour. Th!
e simulations performed have shown clear improvements over zero placement, in terms of time-domain performance figures, intersample behaviour, and the energy consumed in step responses.
Keywords: Frequency domain analysis, Sampled data systems, Digital control
EXTENSION of the file: .pdf
Special (Invited) Session: A new Frequency-Domain Tuning Method to Improve Continuous-time Closed-loop Response
Organizer of the Session: 591-647
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