Initial Centrifuge Tests of a Subject Controllable Anti-G Valve.
Abstract
A subject controllable anti-G valve (SCV) has been built and tested during an initial series of centrifuge runs. Outlet pressure from the SCV over the range of 0-12 psi WITH A MAXIMUM FLOW RATE OFR 13 SCFM. During three gradual onset rate (0.1,0.2,0.4 (3/sec)ramps to S OZ) that were within the allowable limits defined by the standard military specification 9MIL-SPEC). For 30 sec duration plateaus the mean U-suit pressures preferred by the subjects were 0.8 psi at 3 Gz, 2.8 psi at 4 Gz and 5.3 psi at 5 GZ. These values are significantly lower than the mid-range value of the MIL-SPEC at 3 and 4 Gz and slightly higher than the mid-range value at 5 Gz. The MIL-SPEC requires 2.0, 3.5, and 5.0+1- 0.6 psi at 3, 4, and 5 Gz respectively. They decreased their G-suit pressure during the 30 sec plateau at 3 Gz but at 5 Gz selected a slight increase in pressure during the latter part of the plateau. The results are preliminary and additional testing at higher Gz levels and onset rates is recommended.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1987
- Accession Number
- ADA372540
Entities
People
- Douglas S. Brungart
- Nathaniel I. Durlach
- William M. Rabinowitz
Organizations
- Armstrong Laboratory