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An Indirect Mixed-Sensitivity Approach to Microgravity Vibration Isolation: The Exploitation of Kinematic Coupling In Frequency-Weighting Design-Filter SelectionsMany space science experiments need an active isolation system to provide them with the requisite microgravity environment. The isolation systems planned for use with the International Space Station have been appropriately modeled using relative position, relative velocity, and acceleration states. In theory, frequency design filters can be applied to these state-space models, in order to develop optimal H, or mixed-norm controllers with desired stability- and performance characteristics. In practice. however, the kinematic coupling among the various states can lead, through the associated frequency-weighting-filters, to conflicting demands on the Riccati design "machinery." The results can be numerically ill-conditioned regulator and estimator Riccati equations and/or reduced intuition in the design process. In addition, kinematic coupling can result in a redundancy in the demands imposed by the frequency weights. Failure properly to account for this type of coupling can lead to an unnecessary increase in controller dimensionality and, in turn, controller complexity. This paper suggests a rational approach to the assignment of frequency weighting design filters, in the presence of the kinematic coupling among states that exists in the microgravity vibration isolation problem.
Document ID
20010081823
Acquisition Source
Marshall Space Flight Center
Document Type
Other
Authors
Hampton, R. David (Alabama Univ. Huntsville, AL United States)
Whorton, Mark S. (NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
September 7, 2013
Publication Date
January 19, 2000
Subject Category
Space Processing
Report/Patent Number
ACC00-AIAA0036
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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