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An Analysis of the Inertial Properties and Performance of the Astronaut Maneuvering System

Report Number: AMRL TR 65-216
Author(s): Julies A. Tieber; Robert W. Lindemuth
Corporate Author: United States Air Force Institute of Technology
Laboratory: Aerospace Medical Research Laboratories
Date of Publication: 1965-12
Pages: 234
Contract: Laboratory Research - No Contract
Project: 7184
Task: 718405
AD Number: AD0622443

The inertial properties and performance parameters of an Astronaut Maneuvering System are determined by mathematical modeling. The inertial properties of an astronaut in a space suit are determined by modification of an existing mathematical model of the human body to include a mathematical model of a space suit. The space suit model is based on measurements of suited subjects and suit weight regression equations. The inertial properties determined are: (1) location of the system center of mass, (2) moments and products of inertia about the axes through the center of mass, (3) the principal moments of inertia, and (4) the orientation of the principal axes. These properties are used in a computer program developed to analyze the performance of the AMS by simulating the operation of the MMU in the system. Performance parameters determined are: linear and angular acceleration, velocity, and displacement, and fuels consumption. Maneuver and propulsion efficiency factors are defined and calculated. The efficiency factors indicate loss of system effieciency due to inertial cross-coupling, misalignment of center of mass and thrust line, and intermittent thruster operation. The efficiency factors are used to compare system performance during various maneuvers.

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