Zero-G Devices and Weightlessness Simulators (1961) / Chapter Skim
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WEIGHTLESSNESS SIMULATORS
WEIGHTLESSNESS SIMULATORS
Pages 108-125
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From page 108... ...
6. The modest experimental setup, using hastily assembled equipment, was not sufficient to provide accurate quantitative results.
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From page 109... ...
Although the subject could get to the surface immediately after loosening the safety belt, the three main participants developed bilateral, acute, otitis externa, thus terminating prematurely the experiment.
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From page 110... ...
Experiments on the Effect of Simulated Weightlessness Through Water Immersion apparatus which was carried by an experimenter to prevent any possible pull of the subject's body, while an assistant was in charge of placing the subject in different positions and of recording the data (see Figure 67)
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From page 111... ...
NASA Weightlessness Simulator 1. Work with the NASA weightlessness simulator was conducted at NASA-Langley Research Center, Hampton, Virginia.
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From page 112... ...
In some of the tests, the subject will be required to perform simple tasks. Electrocardiographs and skin resistance are among the measurements to be made in some of the first experiments with a human subject, as well as the breathing rate and depth.
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From page 113... ...
Arrangements for use should be made through NASA headquarters. The prospective subject should have some previous training in underwater diving with selfcontained breathing equipment.
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From page 114... ...
In an attempt to obtain complete freedom in the horizontal plane, another device was developed in which compressed air is delivered through a center hole from the top of a circular plate rather than through the surface under the plate. This allows the circular plate to float freely over the surface, thus giving it three degrees of freedom -- two for translation in the horizontal plane, and one for rotation about a vertical axis.
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From page 115... ...
4. As mentioned earlier a direct consequence of the zero-G condition is loss of the friction normally occurring as a result of 115
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From page 116... ...
Figure 72 shows the rotary frictional platform with a subject about to exert a torque on the overhead handle. The experiment at the left was set up to time a single revolution, and thus determine the rotation rate caused by the reaction to the torque.
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From page 117... ...
Request for the use of frictional device by other agencies should be directed to: Commander, Aerospace Medicine Laboratory, Wright Air Development Center, Wright-Patterson Air Force Base, Dayton, Ohio.
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From page 118... ...
Each of the cages is gimbal-mounted to permit rotation through 360° at rates up to 360°/sec. The entire system is mounted in a yoke, 21 feet in diameter, in the Lewis Research Center's Altitude Wind Tunnel.
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From page 119... ...
This also includes the reactions and control capabilities of a human subject in a state of frictionless motion depending primarily on the inertia of the moving mass.
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From page 120... ...
The Multi-Axis Test Facility installed in the altitude wind tunnel. A pilot is shown in the support couch.
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From page 121... ...
The pilot's control system consists of a manually operated on-off type controller that actuates five pairs of nitrogen jet nozzles located on the innermost (roll) cage.
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From page 122... ...
The construction of a Reaction Control Simulator has been proposed by the Space Medicine Section of the Martin Company, Denver, Colorado. A similar device, based on the principle of frictionlessness by means of air bearings, is now under construction at the Ames Research Center, NASA, Moffett Field, California.
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From page 123... ...
The 84 inch diameter base is supposed to have a spherical seat to support the simulator when it is not supported by the air stream. The seat of the base will match the radius of the sphere with the exception of a small area around the air nozzle.
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From page 124... ...
The reaction jets impart movement to the sphere in any of the three principle axes. The control stick is springrestrained to hold it in a central position when no finger pressure is applied.
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From page 125... ...
The Martin Reaction Control Simulator has been described in the company report as of November 1958. It is assumed by the author that the air bearing reaction control device constructed at Ames is based on the same main principles.
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