Stability of linear time-invariant discrete systems
Stability of linear time invariant discrete systems including multiple poles
Desoer, C. A.↗
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Results for “discretization”
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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Discrete spectra and damped waves in quasilinear theory
Quasi-linear equations consequences in discrete spectra and damped electron plasma waves, discussing conservation laws relation to resonance approximation
Montgomery, D.↗
Ogo 5 observations of upstream waves in the interplanetary medium - Discrete wave packets
Upstream discrete wave packets propagation interplanetary medium from Ogo 5 observation
Childers, D. D.↗
Controllability and pole assignment for discrete time linear systems defined over arbitrary fields
Discrete time finite dimensional autonomous linear systems, investigating controllability and pole assignment to closed loop transfer matrix by choice of state variable feedback gain
Foulkes, R.↗
An atomically discrete model for interstitial solid solutions with f.c.c. metals - Thermodynamic properties
Thermodynamic properties of interstitial solid solutions with fcc metals from atomically discrete model by computer simulation
Mclellan, R. B.↗
Discrete sources and the statistics of cosmic- ray propagation
Cosmic ray diffusion from discrete sources in random galactic location, studying chemical constituents anisotropy and age with scattering model
Ramaty, R.↗
Structure and stability of discrete-time optimal systems
Discrete-time optimal linear systems structure and stability, assuming quadratic costs and perfect observability
Rappaport, D.↗
Discrete radiation from rotating periodic sources
Discrete frequency sound radiation from rotating periodic sources covering rotor blade noise in near field and from disk loading asymmetries
Wright, S. E.↗
Exponential absolute stability of discrete systems
Exponential absolute stability of nonlinear discrete systems of Lure type, deriving modified frequency condition
Siljak, D. D.↗
Stability conditions derived from spectral theory - Discrete systems with periodic feedback
Stability conditions of linear discrete system with periodic feedback from spectrum location of bounded linear operator acting in Banach space
Davis, J. H.↗
Estimation of the mean of a discrete parameter, covariance stationary, stochastic process in rotation sampling
Discrete parameter covariance stationary stochastic process in rotation sampling, deriving minimum variance unbiased linear population mean estimator by constrained optimization procedure
Nishikawa, K.↗
Theoretical study of corrugated plates: Shear stiffness of a trapezoidally corrugated plate with discrete attachments to a rigid flange at the ends of the corrugations
Analysis and numerical results are presented for the elastic shear stiffness of a corrugated shear web with a certain type of discrete attachments at the ends of the trough lines of the corrugations, namely point attachments to a rigid flange which interferes with the deformations of the end cross sections by preventing downward movement but permitting upward (lifting off) movement. The analysis is based on certain assumed modes of deformation of the cross sections in conjunction with the method of minimum total potential energy and the calculus of variations in order to obtain equations for the manner in which the assumed modes of deformation vary along the length of the corrugation. The numerical results are restricted to the case of equal-width crests and troughs but otherwise apply to a wide variety of geometries. They are in the form of graphs which give the overall shear stiffness as a fraction of the overall shear stiffness that could be obtained by having continuous attachment at the ends of the corrugations.
Hsiao, C.↗
Low-energy electron transport with the method of discrete ordinates
The one-dimensional discrete ordinates code ANISN was adapted to transport low energy (a few MeV) electrons. Calculated results obtained with ANISN were compared with experimental data for transmitted electron energy and angular distribution data for electrons normally incident on aluminum slabs of various thicknesses. The calculated and experimental results are in good agreement for a thin slab (0.2 of the electron range), but not for the thicker slabs (0.6 of the electron range). Calculated results obtained with ANISN were also compared with results obtained using Monte Carlo methods.
Bartine, D. E.↗
Discrete ordinate theory of radiative transfer. 2: Scattering from maritime haze
Discrete ordinate theory was used to calculate the reflected and transmitted radiance of photons which have interacted with plane parallel maritime haze layers. The results are presented for three solar zenith angles, three values of the surface albedo, and a range of optical thicknesses from very thin to very thick. The diffuse flux at the lower boundary and the cloud albedo were tabulated. The forward peak and other features in the single scattered phase function caused the radiance in many cases to be very different from that for Rayleigh scattering. The variation of the radiance with both the zenith or nadir angle and the azimuthal angle is more marked, and the relative limb darkening under very thick layers is greater, for haze than for Rayleigh scattering. The downward diffuse flux at the lower boundary for A = O is always greater and the cloud albedo is always less for haze than for Rayleigh layers.
Kattawar, G. W.↗
Discrete input equipment design study
The study to improve the reliability of the LUT system by discrete input equipment (DIE) is reported. Subjects discussed include: specifications, packaging, aircraft integrated systems, and word formats DIE. It is recommended that maximal use of advanced technology be made, particularly the "know how' developed on the Saturn project.
Source record↗
Effects of roughness on heating and boundary-layer transition. Part 2: effects of discrete roughness on heating
A preliminary investigation on the effects of roughness on heating in delta wing orbiters was conducted on the windward surface of the vehicle. The purpose of the experiment was to determine the feasibility of using parametric relationships obtained from discrete roughness effects on heating in flat plates and cones, to complex shuttle configurations. An attempt was also made to characterize what parameters were needed to influence roughness. Experimental results show that effective roughness Reynolds numbers are less than or equal to those of flat plates at the same edge Mach number, but, the roughness correlations for plates and cones cannot be applied to the shuttle configuration.
Mateer, G. G.↗
Discrete component S-band power amplifier
A spacecraft S-band power amplifier for Nimbus satellite is reported that achieves stability by use of moderate Q input and output circuits. The discrete component amplifier uses distributed inductance and small piston capacitors for resonance and impedance matching of the transistor to 50 ohm input and output.
Block, A. F.↗
Computational requirements for a discrete Kalman filter.
Computational requirements - i.e., computing time per cycle (iteration) and required storage - which determine minimum sampling rates and computer memory size, were obtained as functions of the dimensions of the important system matrices for a discrete Kalman filter. Two types of measurement processing are discussed: simultaneous and sequential. It is shown that it is often better to process statistically independent measurements in more than one batch and then use sequential processing than to process them together via simultaneous processing.
Mendel, J. M.↗