Passband control of lightly damped systems with mode separation

Timothy N. Chang, Nirwan Ansari

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


This paper deals with the regulation and stabilization of lightly damped systems under plant uncertainty. A controller consisting of a neural-network-based mode separator together with a modular passband tuning regulator is proposed. The mode separator generates the in-phase components of the plant utilized by the passband tuning regulator to maintain closed-loop stability and asymptotic regulation. This combined controller is robust and requires minimal plant information to operate. A synthesis procedure is outlined in this paper to summarize the design steps in a systematic manner. Finally, the application of the passband controller to the stabilization of a magnetic leadscrew is considered. Resonance is shown to be completely eliminated. The stabilization time of the transient response is also significantly reduced, confirming the feasibility of the controller.

Original languageEnglish (US)
Pages (from-to)2169-2176
Number of pages8
JournalIEEE Transactions on Industrial Electronics
Issue number5
StatePublished - May 2008

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


  • Lightly damped systems
  • Mode separation
  • Neural network
  • Passband control
  • Regulation
  • Stabilization
  • Tuning regulator
  • Vibration control


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