Space Suit Simulator (S3) for Partial Gravity EVA Experimentation and Training, Phase II

Metadata Updated: February 28, 2019

Pressurized space suits impose high joint torques on the wearer, reducing mobility for upper and lower body motions. Using actual space suits in training or experimentation is problematic due to the expense, bulk, weight, and difficulty in donning/doffing. The goal of this project was to demonstrate a novel method for simulating space suit joint torques, which are non-linear and vary with angular position. We designed a knee joint simulator using McKibben actuators with active control (also known as artificial muscles), which are cylindrical pneumatic actuators constructed of flexible rubber with an inextensible weave that causes the cylinder to contract longitudinally when pressurized. A commercial knee brace was used as an exoskeleton to mount the actuators. One actuator was mounted anterior to the knee to provide resistance to flexion, and a second actuator was mounted posterior to the knee to provide resistance to extension. The active controller read angle input from a potentiometer mounted to the brace and output the appropriate pressures for each actuator to provide the needed torque. The knee joint was installed on MIT's Robotic Space Suit Tester (RSST), a full-sized anthropometric robot equipped with torque and angle sensors on each of the joints. Results from testing indicated that the torque vs. angle relationship achieved using the actively controlled spacesuit joint simulator was qualitatively similar to the non-linear trend observed in prior testing of the EMU on the RSST. We conclude that the use of these actuators potentially results in higher fidelity than passive actuation.

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Public: This dataset is intended for public access and use. License: U.S. Government Work

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Dates

Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_8974
Maintainer
TECHPORT SUPPORT
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 4bac66f4-dafb-4e9c-829b-81533cee0c84
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2013-05-01
Homepage URL https://techport.nasa.gov/view/8974
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2018-07-19
Program Code 026:027
Source Datajson Identifier True
Source Hash 7ae79c8ad215a37b1a5af6cc64cc1bc1fb11e6cc
Source Schema Version 1.1

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