Dispersion based reduced-order model identification and boundary impedance control in a weakly coupled impedance tube

Yoav Vered, Ran Gabai, Izhak Bucher

Research output: Contribution to journalConference articlepeer-review

Abstract

Impedance tubes are commonly employed for non-destructive measurement methods of the acoustic properties of materials. Most physical models neglect the elastic nature of the tube resulting in a single mode propagation up to the cut-off frequency and are thus unable to accurately predict the propagati patterns in the case of liquidfilled tubes. An understanding of the dispersion pattern in the latter case is crucial for the success of the acoustic properties estimation procedure. Furthermore, a model-based control can be implemented on the basis of the dispersion relation which is able to enhance the existing methods. This work presents a case study of an air-filled impedance tube. A novel, two-actuators phase-perturbations technique was developed to identify the tube dispersion curves and to compare to analytical models. The accurate identification of dispersion curves was utilized in a successful effort to formulate a reduced-order model used to control a single mode traveling wave's ratio by employing a feedforward control algorithm. The success of the case study in the case of a weak acoustic coupling mechanism such as the air-filled impedance tube emphasizes the capabilities when considering a stronger acoustic coupling such as in the liquid-filled impedance tube.

Original languageEnglish
Article number045005
JournalProceedings of Meetings on Acoustics
Volume39
Issue number1
DOIs
StatePublished - 2019
Event178th Meeting of the Acoustical Society of America, ASA 2019 - San Diego, United States
Duration: 2 Dec 20196 Dec 2019

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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