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Obstruction Identification in a Compliant Tube with Application to Airway Passages

Diagnostics and Control Research Centre, Auckland University of Technology, Auckland, New Zealand

Y. Du

Diagnostics and Control Research Centre, Auckland University of Technology, Auckland, New Zealand

Using the acoustic input impedance, an appropriate theoretical technique for identifying constrictions in a tube with wall inertance and elastance being considered is developed. Although the technique could work for various types of tubes, it is applied to identifying occlusion in an upper airway passage. The frequency spectrum of the input impedance is examined for three types of constrictions, namely localized, uniform and gradual models. The result demonstrates that the input impedance resonant frequencies can map the location, severity and degree of the constriction.

Key Words: Constriction • occlusion • asthma • tube • impedance

Journal of Vibration and Control, Vol. 8, No. 5, 643-657 (2002)
DOI: 10.1177/1077546029292


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