Accession Number : AD0475167


Title :   SELF-ORGANIZING SPACECRAFT ATTITUDE CONTROL.


Descriptive Note : Final rept. 15 Jun 64-30 Jun 65,


Corporate Author : ADAPTRONICS INC MCLEAN VA


Personal Author(s) : Barron, Roger L ; Schalkowsky, Samuel ; Davies, John M ; Snyder, Richard F


Report Date : Sep 1965


Pagination or Media Count : 116


Abstract : Results are presented from an investigation of self-organizing attitude control and stabilization for spacecraft. Self-organizing (SOC) control is achieved through high-speed assessments of performance values of successive random experiments with respect to a generalized control criterion, followed by a reward-punishment reinforcement process to obtain on-line synthesis of plant actuation signals. The logic is of the Probability State Variable (PSV) type, i.e., reinforcement signals are used to bias the probabilities associated with the SOC experiments. Convergence of SOC output signals to appropriate, time-varying levels generally occurs within several milliseconds, resulting in rapid, well damped, stable control over a very wide range of controller, plant, and disturbance characteristics (including induced artificial failures). A laboratory experimental self-organizing controller has been fabricated. Evaluations of this SOC have been conducted using single-axis analog computer simulations of a representative orbital vehicle. Compared to a conventional controller for this vehicle, the SOC produced superior transient and comparable steady-state performance. The SOC adapted to a range of plant characteristics over which the conventional controller did not provide uniformly satisfactory performance. (Author)


Descriptors :   *SPACECRAFT , *ATTITUDE CONTROL SYSTEMS , ADAPTIVE SYSTEMS , STABILIZATION , ADAPTIVE CONTROL SYSTEMS , SATELLITE ATTITUDE , BIONICS , ANALOG COMPUTERS , PERFORMANCE(ENGINEERING) , COMPUTER LOGIC , MODEL TESTS


Subject Categories : Astronautics


Distribution Statement : APPROVED FOR PUBLIC RELEASE