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Astronaut Arm Motion Simulation During Extra Vehicular Activity (EVA)

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Document pages: 10 pages

Abstract: Extravehicular Activity (EVA) is one of the critical and essential aspects of manned space missions. Many important tasks in space need to be implemented by astronauts outside the space vehicles. However, EVA is a difficult and expensive task which should be executed in constraints of time, work space and energy by astronauts wearing space suits. Therefore, astronauts need to be trained before implementation of EVA task. All of the preparations need to be carried out based on studies of astronaut motions. Until now, development and training activities associated with the planned EVAs in Russian and U.S. space programs have relied almost exclusively on physical simulators. These experimental tests are expensive and time consuming. Simulation models are nowadays an easier and more economical way to check the implementation process in the earlier stages. Based on this idea, an effort to develop a computational simulation system to model human dynamic motion for EVA is initiated. The objective of the study demonstrates the significant values of simulation of the astronauts EVA tasks using the multibody dynamic analysis. This study focuses on the simulation of an astronaut moving the orbital replaceable units into the worksites or removing them from the worksites. The upper arm model is modeled and simulated virtually using ADAMS LifeMOD® software. Kinematic mechanism during the astronaut’s task can be studied from joint angles and torques. Simulation results obtained are validated with numerical simulation. This research has a great value for on-ground training and planning of astronaut tasks in orbit.

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