The synthesis of optimal controls for linear problems with retarded controls
Synthesis of optimal controls for linear systems with retarded controls
Banks, H. T.↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Optimal stationary control of linear systems with control-dependent noise
Optimal stochastic control investigated for linear systems with driving noise intensity proportional to control input
Kleinman, D. L.↗
Application of modern optimal control theory to environmental control of confined spaces and life support systems
Environmental control of confined spaces and life support systems by Pontryagin maximum principle of optimal control theory, discussing cabins, heat exchanger, etc
Fan, L. T.↗
Sub-optimal control of discrete systems with bounded state and control variables
Suboptimal control of discrete input system with bounded state and control variables, developing algorithm for on-line computation
Boland, J. S., III↗
An approximate minimal time closed-loop controller for processes with bounded control amplitudes and rates
Minimal time closed loop controller design for linear systems with bounded control amplitudes and rates using approximate functional expression
Luh, J. Y. S.↗
The application of specific optimal control to the design of desensitized model following control systems
Desensitized linear servo model following feedback control systems design using specific optimal control concepts
Roy, R. J.↗
Applications of modern optimal control theory to environmental control of confined spaces and life support systems. I
Optimal temperature control for confined spaces and life support systems, using mathematical models of environmental control systems
Fan, L. T.↗
Final flight control software package for digital flight control and landing system
Flight control software package for digital flight control and landing system of CH-46C helicopter
Source record↗
Study of control moment gyroscope applications to space base - Wobble damping and attitude control systems
Control moment gyroscopes for space base wobble damping and attitude control systems
Source record↗
The use of automatic control theory and a pilot math model in helicopter manual control system synthesis
Using automatic control theory with simple pilot model for synthesizing helicopter landing approach flight director control laws
Collins, D.↗
Coupled supersonic inlet-engine control using overboard bypass doors and engine speed to control normal shock position
Coupled supersonic inlet-engine control using overboard bypass doors and engine speed to control normal shock position
Cole, G. L.↗
A control moment gyro fine attitude control system Final technical report
Control moment gyro fine attitude control system for spacecraft
Van Riper, R.↗
A supersonic inlet-engine control using engine speed as a primary variable for controlling normal shock position
Supersonic inlet engine control using engine speed as primary variable for controlling normal shock position
Hagedorn, R. E.↗
A computer-controlled ground command and data acquisition software system for the Orbiting Astronomical Observatory Remote Control Stations
Computer controlled ground based command and data acquisition software system for OAO-A2 spacecraft remote control stations, discussing interface with monitor and interrupt capabilities
Damon, E. P.↗
Application of modern optimal control theory to environmental control of confined spaces and life support systems. II - Basic computational algorithm of Pontryagin's maximum principle and its applications
Optimal control theory application to environmental control of confined spaces and life support systems, considering algorithm of Pontryagin principle
Fan, L. T.↗
Optimal feedback control for nonlinear control moment gyro systems
A study was made, leading to development and analysis of a technique allowing the control moment gyro (CMG) momentum vectors to avoid adverse orientations and thus to provide optimal control for the Apollo Telescope Mount. The technique was formulated in terms of a feedback scheme using a check factor, K, formed as the product of the dot products of the three CMG momentum unit vectors. The parameter K approaches unity for all adverse orientations and was used to initiate a single correction maneuver to rotate the CMG momenta away from a pending adverse orientation and to reduce K to an acceptable value. A digital computer program for ATM simulations was modified to incorporate this correction maneuver and performance was evaluated in simulated cases. Antiparallelism was used as the primary example for the evaluation of the feedback optimization technique.
Kyle, R. G.↗
Regenerable thermal control and carbon dioxide control techniques for use in advanced extravehicular protective systems
The most promising closed CO2 control concept identified by this study is the solid pellet, Mg(OH2)2 system. Two promising approaches to closed thermal control were identified. The AHS system uses modular fusible heat sinks, with a contingency evaporative mode, to allow maximum EVA mobility. The AHS/refrigerator top-off subsystem requires an umbilical to minimize expendables, but less EVA time is used to operate the system, since there is no requirement to change modules. Both of these subsystems are thought to be practical solutions to the problem of providing closed heat rejection for an EVA system.
Williams, J. L.↗
Transient analysis of energy Transfer Control (ECT) and compressor bleed concepts of remote lift fan control
The transient performance of two concepts for control of vertical takeoff aircraft remote lift fans is analyzed and discussed. Both concepts employ flow transfer between pairs of lift fans located in separate parts of the aircraft in order to obtain attitude control moments for hover and low-speed flight. The results presented are from a digital computer, dynamic analysis of the YJ97/LF460 remote drive turbofan. The transient responses of the two systems are presented for step demands in lift and moment.
Sellers, J. F.↗