Technical - NASA

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Technical Report

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OBSERVAT\ONS ON

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LUNAR GRAV\TY S\MULAT\ON

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October 30, 1%8

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Prepared for

Manned Spacecraft Center

National

Aeronautics and Space Houston, Texas

AdministrJ.rioo

Contract No. NAS 9-6481

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AIRESEARCH LMosAANngUeleFsA, CCaTlifUornRiaING DIVISION

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Technical Report

OBSERVATIONS ON LUNAR GRAVITY SIMULATION

lS-68-435() October 30, 1%8

Prepared by W. G. Robertson

E. C. Wortz

Approved by

Prepared for Manned Spacecraft Center National Aeronautics and Space Administration

Houston, Texas Contract No. NAS 9-6481

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AIRESEARCH MANUFACTURING DIVISION

Los Angeles, California

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ABSTRACT

'Expe r i ments we re conducted to eva 1uate and compa re the metabo Ii c costs of performing upper- and lower-torso work in a G-2C pressure suit and to evaluate 1/6-g six-degree-of-freedom simulators based on the metabolic costs of the exercise. Tests were performed at 1 g and at 1/6 g using a counterbalance vertical suspension simulator. Metabolic rates and other physiologic costs of self-locomotion were evaluated at 1/6 g using six subjects wearing pressurized Gemini pressure suits. The physiologic costs of upper-torso work were evaluated in both a 1 g and 1/6-g environment.

Results show that metabolic rates measured at 1/6 g are significantly increased with velocity. Energy costs for carrying a 75-lb earth-equivalentweight pack at 1/6 g increased when compared to costs obtained without additional weight; this increase approached significance. When data were normalized for the subject's lunar weight, it appeared that the subject did not perform as efficiently in simulated lunar gravity as in a 1 g environment. No significant differences were observed between metabolic cost of performing at 1 g and at 1/6 g or between different modes of accomplishing the tasks. The energy costs imposed by the use of the Gemini pressure suit obviates comparing differences between decreased gravity simulators.

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AI RESEARCH MANUFACTURING DIVISION

los Angeles, California

68-4390 Page i i

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CONTENTS

Section

INTRODUCTION

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METHODS AND MATERIALS

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Subjects

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Experimental Design

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Appa ratus

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General

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Six-Degree-of-Freedom Counterbalance

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Suspension Simulator

One-G Test Configuration

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Apparatus for Upper-Torso Exercise

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Instrumentation and Control Systems

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TEST PROCEDURES I

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Preparation

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Da ta Co 11 ec t i on

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RESULTS

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Internal Pressure-Suit Conditions

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Walking Experiments

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Upper-Torso Exercises

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DISCUSSION

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CONCLUSIONS

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REFERENCES

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AIRESEARCH MANUFACTURING DIVISION

Los Angeles, California

68-4390 Page iii

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