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Self-Organizing Spacecraft Attitude Control.

AD475167

Publication Date	1965
Personal Author	Barron, R. L.; Schalkowsky, S.; Davies, J. M.; Snyder, R. F.
Page Count	130
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)
Keywords	Attitude control systems Spacecraft Adaptive systems Stabilization Adaptive control systems Satellite attitude Bionics Analog computers Performance(Engineering) Tests Design Computer logic Model tests
Source Agency	Non Paid Delimited ADS
NTIS Subject Category	84A - Astronautics
Corporate Authors	Adaptronics Inc Alexandria VA
Document Type	Technical Report
Title Note	Final rept. 15 Jun 64-30 Jun 65.
NTIS Issue Number	197715
Contract Number	AF33(615)-1864

Self-Organizing Spacecraft Attitude Control.

Self-Organizing Spacecraft Attitude Control.
AD475167

Publication Date	1965
Personal Author	Barron, R. L.; Schalkowsky, S.; Davies, J. M.; Snyder, R. F.
Page Count	130
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)
Keywords	Attitude control systems Spacecraft Adaptive systems Stabilization Adaptive control systems Satellite attitude Bionics Analog computers Performance(Engineering) Tests Design Computer logic Model tests
Source Agency	Non Paid Delimited ADS
NTIS Subject Category	84A - Astronautics
Corporate Authors	Adaptronics Inc Alexandria VA
Document Type	Technical Report
Title Note	Final rept. 15 Jun 64-30 Jun 65.
NTIS Issue Number	197715
Contract Number	AF33(615)-1864