+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Fang, Xiaowen  Author > Nguyen, Charles C.  NASA Center > NASA (non Center Specific)  Publication Year > 1981-1990 > 1987  Subject > A-C > Cybernetics  Availability Options > Online > PDF  Item/Media Type > NASA Report > Contractor Report (CR)  Item/Media Type > Technical Report  Note: Start a new navigation search by selecting a link above     Previous Record | Next Record + Back to Results   + Printer Friendly Title: Optimal control of large space structures via generalized inverse matrix Author(s): Nguyen, Charles C.; Fang, Xiaowen Abstract: Independent Modal Space Control (IMSC) is a control scheme that decouples the space structure into n independent second-order subsystems according to n controlled modes and controls each mode independently. It is well-known that the IMSC eliminates control and observation spillover caused when the conventional coupled modal control scheme is employed. The independent control of each mode requires that the number of actuators be equal to the number of modelled modes, which is very high for a faithful modeling of large space structures. A control scheme is proposed that allows one to use a reduced number of actuators to control all modeled modes suboptimally. In particular, the method of generalized inverse matrices is employed to implement the actuators such that the eigenvalues of the closed-loop system are as closed as possible to those specified by the optimal IMSC. Computer simulation of the proposed control scheme on a simply supported beam is given. NASA Center: NASA (non Center Specific) Publication Date: JAN 1, 1987 Document Source: CASI Online Source: View PDF File Document ID: 19880004525 Accession ID: 88N13907 Publication Information: Number of Pages = 5 Report Number: NAS 1.26:182336; NASA-CR-182336 Contract-Grant-Task Number: NAG5-949 Price Code: A01 Keywords: BEAMS (SUPPORTS); COMPUTERIZED SIMULATION; LARGE SPACE STRUCTURES; MATHEMATICAL MODELS; MATRICES (MATHEMATICS); SPACECRAFT CONTROL; FEEDBACK CONTROL; OPTIMAL CONTROL; STATE ESTIMATION; STATE VECTORS; Accessibility: Unclassified; No Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2005-08-25 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007