Coupled Thermal and Fluid Dynamics Analysis of a Microgravity Vibration Isolation System for an International Space Station Facility

Loss of muscle mass due to reduced mechanical loading is a critical issue for long duration spaceflight on the International Space Station (ISS) [1]. To address this issue, NASA has developed the Advanced Resistive Exercise Device (ARED) that allows astronauts to perform resistance exercise on the ISS. To minimize force transmission to the ISS, the ARED is mounted to a vibration isolation system (VIS). During squat exercise, ARED rotates relative to the ISS, functioning like a nutcracker to compress the astronaut with a load provided by two vacuum cylinders. Though the ARED is an effective exercise countermeasure device, the extent to which squat exercise on the ISS achieves Earth-equivalent muscle moments remains unknown.

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Passive Vibration Isolation and Absorber System for Earth Imaging from the International Space Station (ISS)

Topics in Modal Analysis II, Volume 6 - Conference Proceedings of the Society for Experimental Mechanics Series ◽

10.1007/978-1-4614-2419-2_9 ◽

2012 ◽

pp. 87-94

Author(s):

Jaganathan Ranganathan ◽

Doug Olsen ◽

William Semke

Keyword(s):

International Space Station ◽

Vibration Isolation ◽

Space Station ◽

International Space ◽

Passive Vibration Isolation

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Dynamics Analysis and Vibration Isolation Design of Shared Foundation on Marine Turbo Generator Set

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.572.193 ◽

2013 ◽

Vol 572 ◽

pp. 193-196

Author(s):

Chong Liu ◽

Chang Hua Qiu ◽

Lei Gao

Keyword(s):

High Speed ◽

Vibration Isolation ◽

Stable Operation ◽

Dynamical Response ◽

Dynamics Analysis ◽

Analysis Model ◽

Lumped Mass ◽

Isolation System ◽

Vibration Isolation System ◽

Turbo Generator

Considering the ship's limited space, high speed and miniaturization have been design directions in marine turbo generator set. The shared foundation with steel plate welding is designed to support the marine turbo generator set. Stiffness and dynamic characteristic of the shared foundation will directly affect the stable operation of the turbo generator set. The paper established the dynamics analysis model for the shared frame of marine turbo generator set according to the 'Lumped Mass Method'. Taking account of the frequency-domain analysis operability, the operational modal analysis and dynamical response on foundation were carried out by Virtual Lab. Based on these results; the intensity and location of exciting force were ascertained. And then, we designed the shared foundation vibration isolation system, and analyzed the characteristics of the vibration isolation mounting. The result shows that the vibration isolation system can minimize output force transmissibility and reduce the effect of the marine turbo generator set vibration.

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Evaluation of a Treadmill with Vibration Isolation and Stabilization (TVIS) for Use on the International Space Station

Journal of Applied Biomechanics ◽

10.1123/jab.15.3.292 ◽

1999 ◽

Vol 15 (3) ◽

pp. 292-302 ◽

Cited By ~ 16

Author(s):

Jean L. McCrory ◽

David R. Lemmon ◽

H. Joseph Sommer ◽

Brian Prout ◽

Damon Smith ◽

...

Keyword(s):

International Space Station ◽

Vibration Isolation ◽

Space Station ◽

Lower Extremities ◽

Structural Safety ◽

Microgravity Environment ◽

Zero Gravity ◽

Experimental Conditions ◽

International Space ◽

Angular Displacements

A treadmill with vibration isolation and stabilization designed for the International Space Station (ISS) was evaluated during Shuttle mission STS-81. Three crew members ran and walked on the device, which floats freely in zero gravity. For the majority of the more than 2 hours of locomotion studied, the treadmill showed peak to peak Linear and angular displacements of less than 2.5 cm and 2.5°, respectively. Vibration transmitted to the vehicle was within the microgravity allocation limits that are defined for the ISS. Refinements to the treadmill and harness system are discussed. This approach to treadmill design offers the possibility of generating 1G-like loads on the lower extremities while preserving the microgravity environment of the ISS for structural safety and vibration free experimental conditions.

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