Determining the natural frequencies of cylindrical non uniform tissues such as the tracheobronchial branched network is a task of multiple difficulties. Two classical experimental procedures, based on mechanical and acoustical excitations, are adopted to determine these frequencies and the results are compared with some numerical values. Although in-vitro test samples of pigs’ tissues are used for the measurements, the results are well indicative of some of the in-vivo dynamic behavior of the respiratory system, which could be correlated to diagnosis and control of lung disorders.

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