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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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Stability and sensitivity requirements considered simultaneously in control system design, minimizing time domain sensitivity index and incorporating transient response characteristics
Stability and sensitivity requirements considered simultaneously in control system design, minimizing time domain sensitivity index and incorporating transient response characteristics
Stability criterion for cross coupled symmetrical two dimensional nonlinear control systems allowing different slopes for Popov lines
Stability theorems established for static and dynamic losses in discrete, linear, elastic systems
Stability margins for hybrid continuous discrete data control systems, developing open loop transfer function
Stability techniques for continuous linear systems
Options for design of aim-stabilizing system analyzed. Report discusses feasibility of digital control system stabilizing aim of 30-in. telescope aboard NASA C141 airplane known as Kuiper Atmospheric Observatory. Proposed digital compensator consists of input analog-to-digital converter, digital controller processor, and output digital-to-analog converter.
Stability of linear nonautonomous systems described by differential equations with time varying coefficients
Stability of linear time varying systems
Mechanical stabilization system for VTOL aircraft
Optimum state variable selection to determine constraints for nonlinear system stability, using Liapunov second method
Stability of linear time-varying systems via examples, comparing various techniques
Stability of linear systems with convolution operator in forward loop and time-varying gain in feedback loop analyzed for frequency- and time- domain conditions
Stability analysis of structural systems subject to nonconservative forces, using finite element method
Stability of linear time invariant systems with single input-output and loop
Stability of single-input single-output single- loop feedback system
Stability behavior of solutions of hamiltonian system
The L-1011 has been flight tested to demonstrate the relaxed static stability concept as a means of obtaining significant drag benefits to achieve a more energy efficient transport. Satisfactory handling qualities were maintained with the design of an active control horizontal tail for stability and control augmentation to allow operation of the L-1011 at centers of gravity close to the neutral point. Prior to flight test, a motion base visual flight simulator program was performed to optimize the augmentation system. The system was successfully demonstrated in a test program totaling forty-eight actual flight hours.