NDLI: Frequency-weighting filter selection, for H/sub 2/ control of microgravity isolation systems: a consideration of the "implicit frequency weighting" problem

Content Provider	IEEE Xplore Digital Library
Author	Hampton, R.D. Whorton, M.S.
Copyright Year	1999
Description	Author affiliation: Alabama Univ., Huntsville, AL, USA (Hampton, R.D.)
Abstract	Many 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-weighting design filters can be applied to these state-space models, in order to develop optimal H/sub 2/ or mixed-norm controllers with desired stability and performance characteristics. In practice, however, since there is a kinematic relationship among the various states, any frequency weighting applied to one state will implicitly weight other states. These implicit frequency-weighting effects must be considered for intelligent frequency-weighting filter assignment. The following paper suggests a rational approach to the assignment of frequency-weighting design filters in the presence of kinematic coupling among states, and applies the results to a microgravity vibration isolation problem.
Starting Page	268
Ending Page	273
File Size	490282
Page Count	6
File Format	PDF
ISBN	0780352769
ISSN	10915281
DOI	10.1109/IMTC.1999.776759
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-05-24
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Filters Control systems Space technology Hydrogen Acceleration Isolators Payloads Mathematical model NASA
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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