An Application of "High Authority/Low Authority Control" & "Positivity"
Abstract
Control Dynamics Company (CDy), in conjunction with NASA Marshall Space Flight Center (MSFC), has supported the U.S. Air Force Wright Aeronautical Laboratory (AFWAL) in conducting an investigation of the implementation of several Department of Defense controls techniques. These techniques are to provide vibration suppression and precise attitude control for flexible space structures. AFWAL issued a contract to Control Dynamics to perform this effort under the Active Control Technique Evaluation for Spacecraft (ACES) Program. Dr. Henry B. Waites (MSFC) was the Principal Investigator Dr. George B. Doane III (CDy) was the Program Manager, and Dr. R. Dennis Irwin (formerly CDy, presently Ohio University) was the Project Leader. The "High Authority Control/Low Authority Control" (HAC/LAC) and "Positivity" controls techniques, which were cultivated under the DARPA Active Control of Space Structures (ACOSS) Program, were applied to a structural model of the NASA/MSFC Ground Test Facility ACES configuration. Mr. Danny K. Tollison performed the HAC/LAC evaluation, and Mr. Jeffrey Lucas performed the Positivity evaluation. The control system designs were accomplished and linear post-analyses of the closed-loop systems are provided. The control system designs take into account effects of sampling and delay in the control computer. Nonlinear simulation runs were used to verify the control system designs and implementations in the facility control computers. Finally, test results are given to verify operations of the control systems in the test facility.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1988
- Accession Number
- ADA351556
Entities
People
- D. Irwin
- D. Tollision
- H. B. Waites
- S. M. Seltzer
Organizations
- National Aeronautics and Space Administration