SEMIANNUAL STATUS REPORT NO. 1 <TO THE< NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, MAR. 1 - SEPT. 1, 1962 <AN ADAPTIVE MODEL FOR NONLINEAR PROCESS IDENTIFICATION<
Adaptive model for nonlinear process identification
NONLINEARITY↗
SEARCH · Engineering Papers
Results for “Nonlinear processes”
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Nonlinear process identification using statistical pattern matrices
Nonlinear process identification using statistical pattern matrices
NONLINEAR SYSTEM↗
Effects of focusing on third-order nonlinear processes in isotropic media
Third-order nonlinear processes in isotropic media have been successfully used for tripling the efficiency of high-power laser radiation for the production of tunable and fixed-frequency coherent vacuum UV radiation and for up-conversion of IR radiation. The effects of focusing on two processes of this type are studied theoretically and experimentally.
Bjorklund, G. C.↗
Nonlinear processes in a uniform and one-component plasma
Nonlinear processes in uniform and one component plasma
NONLINEARITY↗
A hybrid computer for adaptive nonlinear process identification.
Synchronous sequence hybrid computer model for continuous adaptive nonlinear processes
ADAPTIVE CONTROL SYSTEM↗
An algorithm for nonlinear process stabilization and control
Automatic stabilization and control of computerized nonlinear processes, proposing algorithm for stability criteria
Tabak, D.↗
Estimation of the state of a nonlinear process in the presence of nongaussian noise and disturbances.
Optimum estimate of nonlinear process in presence of non-Gaussian noise and disturbances, deriving algorithm for correcting approximation
OPTIMIZATION↗
Nonlinear process identification using decision theory.
Learning technique incorporating feature selection and decision theory for finite memory nonlinear process identification
SYSTEMS ANALYSIS↗
Synthesis of a time optimal control for a second order nonlinear process
Time optimal control for nonlinear second order system containing positive parameter and measurable control function
Boettiger, A.↗
Vertical transport of minor constituents in the lower thermosphere by nonlinear processes of gravity waves
Lower thermosphere minor gaseous constituents vertical transport by nonlinear gravity wave process, showing density scale height decrease from diffusive equilibrium
Hodges, R. R., Jr.↗
A DIGITAL ORTHOGONAL MODEL FOR NONLINEAR PROCESSES WITH TWOLEVEL INPUTS
Identification & model construction of nonlinear systems with two-level inputs & finite settling times
ADAPTIVE CONTROL↗
Synthesis of time-optimal control of a second- order nonlinear process.
Time optimal control of soft spring showing switching locus changes
Boettiger, A.↗
Intensity correlations in optical nonlinear processes by photon counting techniques
Intensity correlations in optical parametric noise and second harmonic generation measured by two photon delayed coincidence counting
Davidson, F.↗
Experimental characterization of nonlinear processes of whistler branch waves
Explore the source record for details and available documents.
E. M. Tejero↗
Particle-in-cell Simulations of Decaying Plasma Turbulence: Linear Instabilities versus Nonlinear Processes in 3D and 2.5D Approximations
Explore the source record for details and available documents.
S. Peter Gary↗
Nonlinear optical processing with Fabry-Perot interferometers containing phase recording media
New techniques in nonlinear optical processing are explored, based on the operation of intensity level selection as performed by a Fabry-Perot interferometer containing a phase object. The image being processed is recorded on a medium between the mirrors as a spatially varying phase shift less than pi. The interferometer only transmits light through those portions of the object that corresponds to a single value of the phase and hence to a single intensity level in the input. More complicated operations such as thresholding and analog-to-digital conversion are performed by modulating the light source as the different levels are selected. Photoresist and lithium niobate have been used as phase objects, and experimental data for both are presented. Three kinds of Fabry-Perot interferometers have been used to demonstrate nonlinear processing using coherent and incoherent light. Color images have been produced with black and white inputs and white light illumination.
Bartholomew, B. J.↗
A nonlinear filtering process diagnostic system for the Space Station
A nonlinear filtering process diagnostic system, terrestrial simulation and real time implementation studies is presented. Possible applications to Space Station subsystem elements are discussed. A process diagnostic system using model based nonlinear filtering for systems with random structure was shown to provide improvements in stability, robustness, and overall performance in comparison to linear filter based systems. A suboptimal version of the nonlinear filter (zero order approximation filter, or ZOA filter) was used in simulation studies, initially, with a pressurized water reactor model and then with water/steam heat exchanger models. Finally, a real time implementation for leak detection in a water/steam heat exchanger was conducted using the ZOA filter and heat exchanger models.
Yoel, Raymond R.↗
Concurrent processing in nonlinear structural stability
A concurrent processing algorithm is developed for materially nonlinear stability analysis of imperfect columns with biaxial partial rotational end restraints. The algorithm for solving the governing nonlinear ordinary differential equations is implemented on a multiprocessor computer called the 'Finite Element Machine', developed at the NASA Langley Research Center. Numerical results are obtained on up to nine concurrent processors. A substantial computational gain is achieved in using the parallel processing approach.
Darbhamulla, S. P.↗