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UBC Theses and Dissertations
Vibration isolation active control techniques and testing in a micro-gravity environment Boulet, Jason
Abstract
Since orbitting space stations do not provide a perfect micro-gravity environment, vibration isolation techniques must be employed for sensitive experiments, such as crystal growing. A non-contact approach using magnetic levitation for active vibration isolation has been developed previously that can be used in all micro-gravity situations. Using advanced controller techniques, it should be possible to lower the stiffness of the magnetic coupling below levels achievable by PID control. This thesis examines controlling magnetic levitation (MAGLEV) for improved vibration isolation on Earth and in a micro-gravity environment. Lorentz forces are used to levitate a large platform holding the application in an experimental system using this MAGLEV technology. This technology is described and two designs of it's application are presented. Vibration control techniques are investigated, with and Q-parameterization algorithms explained and employed in active control in a normal gravity environment. A smaller magnetically levitated wrist device is then described and employed in a coarse-fine approach to isolating acceleration disturbances in the microgravity environment provided by NASA's DC-9 performing parabolic flights. Results of the testing done on the flight is given and analyzed.
Item Metadata
Title |
Vibration isolation active control techniques and testing in a micro-gravity environment
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1997
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Description |
Since orbitting space stations do not provide a perfect micro-gravity environment, vibration
isolation techniques must be employed for sensitive experiments, such as crystal
growing. A non-contact approach using magnetic levitation for active vibration isolation
has been developed previously that can be used in all micro-gravity situations. Using
advanced controller techniques, it should be possible to lower the stiffness of the magnetic
coupling below levels achievable by PID control.
This thesis examines controlling magnetic levitation (MAGLEV) for improved vibration
isolation on Earth and in a micro-gravity environment. Lorentz forces are used
to levitate a large platform holding the application in an experimental system using
this MAGLEV technology. This technology is described and two designs of it's application
are presented. Vibration control techniques are investigated, with and
Q-parameterization algorithms explained and employed in active control in a normal
gravity environment. A smaller magnetically levitated wrist device is then described and
employed in a coarse-fine approach to isolating acceleration disturbances in the microgravity
environment provided by NASA's DC-9 performing parabolic flights. Results of
the testing done on the flight is given and analyzed.
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Extent |
4686330 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-12
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0065114
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1997-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.