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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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Experimental study on local heat transfer during turbulent flow of piped carbonic acid and water in supercritical region with state variables
Necessary and sufficient conditions for decoupling time-invariant linear multivariable system by state variable feedback, discussing transfer matrix consequences
Optimum sensitivities of control function with respect to vehicle parameter changes and state variables without using finite differences
Algorithm for optimal singular control based on bounded state variables
The problem of a maneuverable spacecraft, with limited thrust capability, moving between two coplanar circular earth orbits is considered. Thrusting is performed in the plane defined by the circles, so that the nonlinear dynamics and subsequent optimization problem are simplified. The approach used in this paper differs from the approaches of Edelbaum and Goetz in that the equations of motion are not linearized before formulating the optimization problem. An averaging approximation is used to determine the structure of the significant co-state variables.
Time optimal control for nonlinear systems, expressing optimal control law as function of state variables
Time invariant linear control system decoupling using state variable feedback, determining synthesis procedure to obtain desired closed loop configurations
Continuous time nonlinear dynamical system states variables estimated suboptimally from discrete noisy measurements with second order nonlinear filter, deriving dynamical equations
Optimal control problems with discontinuities, noting jump discontinuities in state variable derivative arising in bang-bang control problems
Continuous time nonlinear dynamical system states variables estimated suboptimally from discrete noisy measurements with second order nonlinear filter, deriving dynamical equations
Linear state variable feedback to obtain asymptotic stabilization of linear dynamic systems
Stationary controller design for linear time varying control systems with state variables not always accessible for feedback
Initial conditions estimation problem for nonlinear system asymptotic stability and satisfaction of output constraints on state variables
Trajectory differential equations in state- variable form, presenting compatible difference equation adjoint scheme for trajectory integration
VTOL aircraft stability augmentation system design based on control theory state variable methods, using minimum power levels
Upper bound determination for errors due to signal quantization in multirate digital control system through state variable or z transform formulations
Active RC bandpass filter for space fluxgate magnetometer, using state variable synthesis
Discrete time finite dimensional autonomous linear systems, investigating controllability and pole assignment to closed loop transfer matrix by choice of state variable feedback gain