Digital redesign of analog Smith predictor for systems with input time delays

Alex C. Dunn, Leang San Shieh, Shu Mei Guo

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


This paper presents a new methodology for digitally redesigning an existing analog Smith predictor control system, such that the cascaded analog controller with input delay can be implemented with a digital controller. A traditional analog Smith predictor system is reformulated into an augmented system, which is then digitally redesigned using the predicted intersampling states. The paper extends the prediction-based digital redesign method from a delay free feedback system to an input time-delay cascaded system. A tuning parameter v is optimally determined online such that in any sampling period, the output response error between the original analogously controlled time-delay system and the digitally controlled sampled-data time-delay system is significantly reduced. The proposed method gives very good performance in dealing with systems with delays in excess of several integer sampling periods and shows good robustness to sampling period selection.

Original languageEnglish
Pages (from-to)33-47
Number of pages15
JournalISA Transactions
Issue number1
Publication statusPublished - 2004 Jan

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Instrumentation
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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