importance of active transducer selection -for broadband disturbance accommodation is emphasized. An algorithm for systematically selecting actuators with high influence on the regulated variables is described, together with its theoretical foundation. The algori thm is demonstrated on the ACOSS Model No. 2 structure, obtaining minima1s e1ections with substantially fewer actuators than controlled modes. Disturbance-rejection contro1 designs based on these se1ections exhibit stabi1ity in the presence of residual modes over a frequency range well beyond that of the design model. Sampled-data control for flexible structures is examined using second- order difference equations. A sufficient condition for geometric stability with velocity output feedback requiring non-colocation of actuators and sensors is obtained. Non-colocation reduces to colocation as the sampling period converges to zero. Optimal large-angle? slew for linear tracking and terminal convergence is considered. Explicit solutions as a function of matrices satisfying linear algebraic equations are obtained. Demonstrations on a rotating rigid hub with four flexible appendages exhibit the computational efficiency of the solution techniques. (Author (G R A) ) Source of Abstract (Subfile): DTIC Descriptors: *ACTIVE CONTROL; *SPACE PLATFORMS; ♦SPACECRAFT STABILITY; *SPACECRAFT STRUCTURES; *SURVEILLANCE; ALGORITHMS; ELECTRO-OPTICS; FLEXIBLE BODIES; INFRARED DETECTORS; MIRRORS; OPTICAL EQUIPMENT; POWER SPECTRA; TRACKING (POSITION); VIBRATION; WAVE FRONT DEFORMATION Subject Classification: 7518 Spacecraft Design, Testing ?? P e r f o r m a n c e (1975-) COSATI Code: 17E Infrared & Ultraviolet Detection
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