Rapid identification of linear and nonlinear systems.
Rapid parameter identification system for linear time-invariant plant with only input and output measurable
TRANSFER FUNCTION↗
SEARCH · Engineering Papers
Results for “invariance”
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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An experimental determination of differential equations to describe simple nonlinear systems.
Ordinary differential equations experimentally determined for describing performance of existing lumped-parameter time-invariant nonlinear physical systems
NONLINEAR SYSTEM↗
N-representability problem for fermion density matrices. II - the first-order density matrix with N even.
First-order density matrix corresponding to nondegenerate eigenstate be N-representable for time-reversal invariant Hamiltonian and quantum- mechanical system of N identical fermions
HAMILTONIAN↗
Source of outer zone protons.
Acceleration processes of outer zone protons investigated, using Kellogg hypothesis of radiation belt formation through magnetic disturbances where third adiabatic invariant is violated
OUTER RADIATION BELT↗
Diffusion of protons in the outer radiation belt.
Diffusion of protons in outer radiation belt due to violation of third adiabatic invariant for trapped particles
PROTON ENERGY↗
Compound diode-transistor structure for temperature compensation.
Compound diode-transistor structure with current gain invariant with temperature
DIODE↗
Liapunov's second method
Stability theorem based on Liapunov function, and using invariance property of limit sets of solutions to differential equations
THEOREM PROVING↗
Four-fermion interaction Lagrangians
Pauli exclusion principle and Fierz rearrangement theorem shown to limit arbitrariness of Lorentz invariant interaction Lagrangian for self-coupled Dirac field
LAGRANGE EQUATION↗
On a problem of Letov in optimal control
Fixed-time regulator problem with time invariant feedback control and unspecified-time regulator problem with bounded control
FEEDBACK CONTROL SYSTEM↗
Computation of approximate fuel-optimal control
Iterative digital computer determination of optimal fuel control in linear time-invariant plant
ITERATIVE SOLUTION↗
An electrohydrodynamically induced spatially period cellular Stokes-flow
Spatially periodic, time invariant electric field used to create spatially periodic cellular flow by action of electric shear stress in region of fluid-fluid interface
LIQUID FLOW↗
On the input-output stability of time-varying nonlinear feedback systems. II - Conditions involving circles in the frequency plane and sector nonlinearities.
Stability theory based on functional methods, examining feedback system with linear time invariant and nonlinear elements
NONLINEAR FEEDBACK↗
Another note on the transformation to canonical /phase-variable/ form.
Nonsingular linear transformation of time- invariant linear dynamic system into canonical /phase-variable/ form
MATRIX ALGEBRA↗
Behavior of triangular shell element stiffness matrices associated with polyhedral deflection distributions.
Invariants of triangular shell element stiffness matrices associated with polyhedral deflection distribution, discussing effect of geometry
STIFF STRUCTURE↗
On the uniqueness of the extremal controls for a class of minimum fuel problems.
Uniqueness of extremal controls for minimum fuel problems pertaining to single input linear time- invariant systems
LINEAR SYSTEM↗
On the adiabatic motion of energetic particles in a model magnetosphere.
Adiabatic invariant analysis of charged particle motion in model magnetosphere
ADIABATIC EQUATION↗
On the factorization of secular equations by group theory.
Explicit invariant forms of factor equations for factorization of secular equations by group theory
QUANTUM MECHANICS↗
Adiabatic motions of charged particles in a dipole model of the magnetosphere.
First and second adiabatic invariants of charged particle motion in calculating trajectory in combined electric-magnetic field
MAGNETOSPHERE↗