Microgravity Vibration Isolation Subsystem (MVIS) - 08.20.14
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Microgravity Vibration Isolation Subsystem (MVIS) was designed to allow experiments to be conducted in low gravity without interference from vibrations produced by the International Space Station (ISS). Through collaboration with the European Space Agency in their Fluid Science Laboratory (FSL), MVIS will aim to improve the opportunities for the exploitation of microgravity vibration isolation technology.
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Bristol Aerospace Limited, Winnipeg, Manitoba, Canada
MacDonald Detweiller and Associates, Rockville, MD, United States
Sponsoring Space Agency
Canadian Space Agency (CSA)
ISS Expedition Duration
March 2009 - September 2012
Previous ISS Missions
The MVIS system is the next generation of vibration isolation systems produced by the CSA to the Microgravity Isolation System (MIM) -2 that flew on STS-85.
- Microgravity Vibration Isolation Subsystem (MVIS) will monitor the position of the core element of the Fluid Science Laboratory (FSL) and is armed with an extremely sensitive accelerometer that can chart movement or vibration aboard the station.
The MVIS consists of a distributed set of large actuators, with permanent magnets mounted on the Facility Core Element (FCE) and voice coils attached to the International Standard Payload Rack (ISPR). Three accelerometer assemblies are also mounted on the FCE, housing three accelerometers each. This allows determination of both the linear accelerations and the rotational acceleration of the FCE, and allows for up to three levels of redundancy. There are four Light Emitting Diodes (LEDs) mounted on the FCE with collimated (light beams with parallel rays) beams directed at four two dimensional Position Sensing Devices (PSDs) mounted on the ISPR. This allows for tracking the position and orientation of the FCE with respect to the ISPR.
The Electronics Unit (EU) that controls the MVIS is mounted separately in the ISPR. The EU box is located in the top right section of the FSL. The signals from the accelerometers are digitized within their respective housings and sent to the EU in digital form to minimize susceptibility to electromagnetic noise. The MVIS has been incorporated integrally within the FSL and is designed to isolate the FCE from the vibrations of the ISS and from disturbances generated within the FSL ISPR itself. The MVIS consists of a distributed set of large gap Lorentz force actuators, with permanent magnets mounted on the FCE and voice coils attached to the ISPR. Three accelerometer assemblies are also mounted on the FCE, each housing three accelerometers. This allows determination of both the linear and rotational accelerations of the FCE. There are four light emitting diodes (LED) mounted on the FCE with collimated beams directed at four two-dimensional position sensing devices (PSD) mounted on the ISPR. This allows for tracking the position and orientation of the FCE with respect to the ISPR. An electronic unit that controls the MVIS is mounted separately within the ISPR. The signals from the accelerometers and PSD are sent to the electronic unit and used by the algorithms that control the FCE. An active control is used to approximately 50Hz, after which the control is passive.
- MVIS is a six degree of freedom magnetic levitation system that has been designed to isolate the European Space Agency's FSL facility core element experiments from vibratory accelerations on the ISS.
Ground Based Results Publications
Trinchero G, Cardano M, Pensavalle E, Bassano E, Dell'Aversana P, Lappa M, Tacconi M. The Fluid Science Laboratory on the ISS Columbus module performances and operations. International Journal of Microgravity Science and Application. 2008; 25(3): 303-308.
Casgrain C, Dejmek M, Ruel S, Ruel S, Vachon E. The Canadian Space Agency microgravity science program overview. 42nd Aerospace Sciences Meeting and Exhibit, Reno, NV; 2004 January 5-8 10 pp.
Tryggvason BV, Redden RF, Herring RA, Duval W, Smith RW, Rezkallah KS, Varma S. The vibration environment of the International Space Station: Its significance to fluid-based experiments. Acta Astronautica. 2001 January; 48(2-3): 59-70. DOI: 10.1016/S0094-5765(00)00140-5.
Labib M, Piontek D, Valsecchi N, Griffith B, Dejmek M, Jean I, Mailloux M, Palardy R, Michels J, Michalyna C, de Carufel J. The fluid science laboratory's microgravity vibration isolation subsystem overview and commissioning update. SpaceOps 2010, Huntsville, Alabama; 2010 April 25-30 10 pp.
The Microgravity Vibration Isolation Subsystem (MVIS). Image courtesy of CSA.
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Image of the MVIS Electronic Unit (EU). Image courtesy of CSA.
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Canadian Space Agency Astronaut Bob Thirsk commissions MVIS in the Fluid Science Laboratory, located in the Columbus Laboratory of the International Space Station .
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