Adaptive-passive noise control with self-tuning Helmholtz resonators

J. M. De Bedout, M. A. Franchek, R. J. Bernhard, L. Mongeau

Research output: Contribution to journalArticlepeer-review

159 Scopus citations


A tunable Helmholtz resonator and a novel feedback based control law that achieves optimal resonator tuning for time varying tonal noise control applications are presented in this paper. The proposed tuning strategy combines an open loop tuning algorithm based on a simple lumped parameter model of the resonator with a gradient descent approach based on a feedback control structure that ensures robust performance. Optimal tuning of the resonator is achieved despite system uncertainties such as variations in the excitation frequency and environmental changes. An experimental verification of the proposed control law is included. Sound pressure level reductions of up to 30 dB were achieved in an experimental duct system using a tunable Helmholtz resonator.

Original languageEnglish (US)
Pages (from-to)109-123
Number of pages15
JournalJournal of Sound and Vibration
Issue number1
StatePublished - Apr 24 1997

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering


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