The stabilization of a nonlinear system using a linear system estimator
Nonlinear systems stabilization with linear system estimator output state to provide feedback for asymptotic stability of overall system
Strane, R. E.↗
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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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Development of an algorithm for the nonlinear stability analysis of the orbiting astronomical observatory control system
Stability analysis algorithm for estimating equilibrium state of OAO control system
Cohen, V.↗
Apollo experience report: Guidance and control systems. Lunar module stabilization and control system
A brief functional description of the Apollo lunar module stabilization and control subsystem is presented. Subsystem requirements definition, design, development, test results, and flight experiences are discussed. Detailed discussions are presented of problems encountered and the resulting corrective actions taken during the course of assembly-level testing, integrated vehicle checkout and test, and mission operations. Although the main experiences described are problem oriented, the subsystem has performed satisfactorily in flight.
Shelton, D. H.↗
Control dynamics analysis of the Centaur stage propellant utilization control system
Stability properties of Centaur propellant utilization control system
SYSTEM STABILITY↗
A piloted simulation study of the effects of controller force gradient in VTOL hovering flight
A study of the effect of control force gradient on the VTOL visual hovering task was conducted on the NASA-Ames Research Center Six-Degree-of-Freedom Motion Simulator. Lateral control force-gradient characteristics were evaluated in combination with three different types of stabilization systems: An unstabilized (acceleration) system, a rate-stabilized system, and two attitude-stabilized systems. The effects of gust disturbances were included in the control force evaluation for the attitude systems. A force gradient of 1.0 lb/in was within the optimum range for all control systems and conditions evaluated in this study.
Fry, E. B.↗
Analysis and testing of stability augmentation systems
Testing and evaluation of stability augmentation systems for aircraft flight control were conducted. The flutter suppression system analysis of a scale supersonic transport wing model is described. Mechanization of the flutter suppression system is reported. The ride control synthesis for the B-52 aeroelastic model is discussed. Model analyses were conducted using equations of motion generated from generalized mass and stiffness data.
Sevart, F. D.↗
Stability and transient motion of a vertical three-lobe bearing system
Stability characteristics and general transient motion of vertical finite width three lobe journal bearing, assuming incompressible fluid with cavitation
Falkenhagen, G. L.↗
THE STABILIZATION OF AN ARTIFICIAL SATELLITE AT THE INFERIOR CONJUNCTION POINT OF THE EARTH-MOON SYSTEM
Stabilization of a satellite at the inferior conjunction point of the earth-moon system
SATELLITE↗
Extended dynamical systems and stability theory
Extended dynamical system to describe operators in study of stability
OPERATOR↗
An energy method for stability analysis of nonlinear, nonconservative systems.
Nonlinear nonconservative systems stability analysis by approximate method based on principle of energy conservation
ENERGY STORAGE↗
Extended dynamical systems and stability theory.
Extended dynamical systems in Banach space and use of invariance principle for stability theory of partial differential equations
PARTIAL DIFFERENTIAL EQUATION↗
The stability of distributed parameter systems.
Distributed parameter systems stability as internal and input-output property, describing Liapunov functionals construction
Willems, J. C.↗
On the stability of randomly sampled systems
Randomly sampled linear systems stability with linear or nonlinear feedback loops, using stochastic Liapunov function method
Kushner, H. J.↗
On the stability of some continuous systems subjected to random excitation
Continuous structural systems stability under random load excitation from linear partial differential equations of motion
Infante, E. F.↗
Absolute capacitance microcreep and dimensional stability measuring system
Absolute capacitance microcreep and dimensional stability measuring system
Lyons, J. W., Jr.↗
Analysis and testing of aeroelastic model stability augmentation systems
Testing and evaluation of a stability augmentation system for aircraft flight control were performed. The flutter suppression system and synthesis conducted on a scale model of a supersonic wing for a transport aircraft are discussed. Mechanization and testing of the leading and trailing edge surface actuation systems are described. The ride control system analyses for a 375,000 pound gross weight B-52E aircraft are presented. Analyses of the B-52E aircraft maneuver load control system are included.
Sevart, F. D.↗
B-52 stability augmentation system reliability
The B-52 SAS (Stability Augmentation System) was developed and retrofitted to nearly 300 aircraft. It actively controls B-52 structural bending, provides improved yaw and pitch damping through sensors and electronic control channels, and puts complete reliance on hydraulic control power for rudder and elevators. The system has experienced over 300,000 flight hours and has exhibited service reliability comparable to the results of the reliability test program. Development experience points out numerous lessons with potential application in the mechanization and development of advanced technology control systems of high reliability.
Bowling, T. C.↗