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Direct Output Feedback Control of Large Flexible Spacecraft


Chen, Carl Leei (1982) Direct Output Feedback Control of Large Flexible Spacecraft. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/vx2f-yh14.


This report addresses the problem of active control of large flexible space structures. The current activities and control schemes in this field are briefly reviewed. A direct output feedback control (DOFC) technique is proposed to control the large flexible space structures. Assuming an N-degree-of-freedom system with n collocated sensor and actuator (S/A) pairs, where N is typically much larger than n, the analysis shows that at least the first n lowest critical vibration modes can be controlled with the system remaining stable. A formula for the selection of the feedback control gain matrix is provided. The DOFC approach is also applicable to the systems with certain types of nonlinearities, as well as systems including sensor/actuator dynamics. A simple criterion for selecting the "optimal" location of collocated sensor and actuator pairs is proposed. Numerical examples are given to illustrate the proposed DOFC technique and the "optimal" location criterion.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Applied Mechanics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Mechanics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Caughey, Thomas Kirk
Thesis Committee:
  • Knowles, James K. (chair)
  • Wilts, Charles Harold
  • Wood, David Shotwell
  • Zukoski, Edward E.
Defense Date:23 February 1982
Funding AgencyGrant Number
Hughes Aircraft CompanyUNSPECIFIED
Record Number:CaltechETD:etd-12082005-143337
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4866
Deposited By: Imported from ETD-db
Deposited On:08 Dec 2005
Last Modified:16 Apr 2021 23:28

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