COMPUTER CONTROL OF AN ELECTRO-MECHANICAL REGULATOR FOR PROVIDING POSITIVE PRESSURE BREATHING AND AN ELECTRONIC G-VALVE FOR HUMAN +Gz RESEARCH

Authors
  1. Pecaric, M.
  2. Buick, F.
  3. Maloan, J.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Electronic G-valves and breathing regulators are being incorporated into some life-support systems designed for aircrew protection. The utility of these electronic systems, however, has not reached its full potential in the research environment. An electronically controlled G-valve and electro-mechanical breathing regulator were obtained. A prototype, conputer-controlled life-support system interface was developed in the laboratory and evaluated in the centrifuge. The interface was used to provide different schedules for G-suit inflation and positive pressure breathing during +Gz (PBG). Output pressures from both a G-valve and breathing regulator were driven by a voltage proportional to the centrifuge +Gz level (from a computer running instrument-controller software) supplied to the system's electronic control unit. The required voltages were calculated from the pressure schedule defined from the following parameters: (i) cut-in +Gz level; (ii) delta in pressure /delta+Gz; and (iii) peak pressure of the schedule. Any G-suit pressure or PBG pressure schedule could be produced. The schedules and the performance of the G-valve and breathing regulator were also evaluated at different +Gz onset rates (0.1 and 3.0 +Gz/sec). G-suit pressure and PBG level accurately tracked the +Gz level. The pressure began, increased, and attained the peak level required in both gradual and rapid +Gz onset conditions. TRUNCATED
Report Number
DCIEM-93-05 — Research Report
Date of publication
01 Jan 1993
Number of Pages
48
DSTKIM No
93-02692
CANDIS No
129007
Format(s):
Hardcopy;Originator's fiche received by DSIS

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