Optimization of variable volume exhaust semi-closed underwater breathing apparatus.

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Optimization of variable volume exhaust semi-closed underwater breathing apparatus.

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dc.contributor.author Finlayson, WS
dc.contributor.author Niggernann, BR
dc.contributor.author Nuckols, ML
dc.date.accessioned 2009-02-18T03:18:51Z
dc.date.available 2009-02-18T03:18:51Z
dc.date.issued 2001
dc.identifier.citation Finlayson WS, Niggernann BR, Nuckols ML. Optimization of variable volume exhaust semi-closed underwater breathing apparatus. OCEANS, 2001. MTS/IEEE Conference and Exhibition. 5-8 Nov. 2001 1731 - 1734 vol.3 en
dc.identifier.isbn 0-933957-28-9
dc.identifier.uri http://archive.rubicon-foundation.org/7961
dc.description Copyright © 2001 IEEE. en
dc.description.abstract The performance of variable volume exhaust rebreathers are characterized by an exhaust volume ratio (EVR), the ratio of the small inner bellows volume relative to the main breathing bellows, and supply gas oxygen concentrations (XO2). This paper details the development of the approach used to enhance the performance of these systems. An analytical model has recently been developed for predicting the circuit oxygen levels in variable volume exhaust semi-closed underwater breathing apparatus at various mission depths and diver activity levels. Unmanned testing in June 2000 with a commercially available system showed good agreement with this analytical model over a wide range of diver depths, orientations and activity levels. The analytical model showed that for given operational parameters of maximum and minimum depth there must be an optimum EVR and XO2 which will maximize capability while ensuring allowable maximum and minimum partial pressures of oxygen (PO2) in the breathing circuit. By specifying boundary conditions on the analytical model at maximum and minimum depth for the associated allowable minimum and maximum PO2 an analytical relationship for EVR and XO2 was developed and subsequently validated in unmanned testing at the Experimental Diving Unit in Panama City, Florida. Associated EVR and XO 2 are presented for three missions of possible interest to the Navy; shallow depth &(lt;60 FSW), deep depth &(lt;190 FSW) and a switch over to closed circuit at very shallow depth (20 FSW) en
dc.description.sponsorship US NAVY en
dc.format.extent 410062 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher IEEE en
dc.subject diving en
dc.subject rebreather en
dc.subject underwater breathing apparatus en
dc.subject semi-closed en
dc.subject oxygen en
dc.subject performance(engineering) en
dc.subject exhaust volume ratios en
dc.subject breathing bellows en
dc.subject prediction en
dc.subject optimisation en
dc.subject physiological models en
dc.subject diluent injection system en
dc.subject analytical model en
dc.subject methods en
dc.subject unmanned testing en
dc.title Optimization of variable volume exhaust semi-closed underwater breathing apparatus. en
dc.type Article en

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