Simulating respiratory loads and tuning of closed-circuit underwater breathing apparatus

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Simulating respiratory loads and tuning of closed-circuit underwater breathing apparatus

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Title: Simulating respiratory loads and tuning of closed-circuit underwater breathing apparatus
Author: Joye, DD; Wechgelaer, P
Abstract: An experimental apparatus for simulating respiratory loads in closed-circuit underwater breathing systems comprises a partly submerged vertical tube having a dual path exit on the submerged end of the tube. One path is controlled by a valve that alters the inertance of the system, changes the natural frequency, and provides the tuning. The vertical tube provides elastic loading to simulate a counterlung or breathing bag in an underwater breathing apparatus (UBA). The experimental apparatus was connected to a breathing machine controlled by a signal generator to simulate a diver's breathing. The benefits of reactance tuning of this apparatus are demonstrated. A mathematical model describes both the simulator and UBA. The simulator can be used with human subjects to study respiratory response to changes in impedance.
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: PMID: 9171467
http://archive.rubicon-foundation.org/2265
Date: 1997

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