Computer-controlled steering of the Apollo spacecraft.
Apollo spacecraft powered maneuvering controlled by digital computer as central element in guidance, navigation and control system
Battin, R. H.↗
SEARCH · Engineering Papers
Results for “digital computing”
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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Circuitry selectively limits data storage in general purpose computer
Circuitry limits storage in the memory of a stored program general purpose digital computer by permitting storage or writing to certain, specified areas of memory. The limit register used in the computer is easily set under program control, and the memory block size and position is readily changed to suit each specific program.
Slopper, D. K.↗
Human operator characteristics based on an analog computer oriented parameter identification technique.
Parameter identification algorithm identifying linear dynamic systems by digital computer used to identify human operator characteristics in closed loop control situation
Burgett, A. L.↗
A modern hybrid computer interface
Hybrid interface for high speed iterative differential analyzer and PDP-9 digital computer
Wilkins, J. M.↗
Computer simulation of Saturn 5 response to pre-launch wind loads
A digital computer program is described which was developed to estimate Saturn 5 response to prelaunch wind conditions at Cape Kennedy. The program computes displacement and bending moment statistics as a function of parameters defining the atmospheric environment. A sample problem is provided to illustrate utilization of the program.
Coffin, T.↗
Input of information recorded on magnetic tape in the BESM-3M computer
An input unit designed for the BESM-3M general-purpose digital computer is described. The input unit uses a standard MEZ-28A studio tape recorder. An automatic data-input subroutine is presented.
Afraymovich, E. L.↗
On the writing of programming systems for spacecraft computers.
Consideration of the systems designed to generate programs for the increasingly complex digital computers being used on board unmanned deep-space probes. Such programming systems must accommodate the special-purpose features incorporated in the hardware. The use of higher-level language facilities in the programming system can significantly simplify the task. Computers for Mariner and for the Outer Planets Grand Tour are briefly described, as well as their programming systems. Aspects of the higher level languages are considered.
Mathur, F. P.↗
Digital circuits for computer applications: A compilation
The innovations in this updated series of compilations dealing with electronic technology represent a carefully selected collection of digital circuits which have direct application in computer oriented systems. In general, the circuits have been selected as representative items of each section and have been included on their merits of having universal applications in digital computers and digital data processing systems. As such, they should have wide appeal to the professional engineer and scientist who encounter the fundamentals of digital techniques in their daily activities. The circuits are grouped as digital logic circuits, analog to digital converters, and counters and shift registers.
Source record↗
Computer programming for a digital data acquisition system
Computer programming for digital data acquisition system - digital tape format, obtaining data in engineering units, and data analysis
DATA ACQUISITION↗
Program for the analysis of time series
A digital computer program for the Fourier analysis of discrete time data is described. The program was designed to handle multiple channels of digitized data on general purpose computer systems. It is written, primarily, in a version of FORTRAN 2 currently in use on CDC 6000 series computers. Some small portions are written in CDC COMPASS, an assembler level code. However, functional descriptions of these portions are provided so that the program may be adapted for use on any facility possessing a FORTRAN compiler and random-access capability. Properly formatted digital data are windowed and analyzed by means of a fast Fourier transform algorithm to generate the following functions: (1) auto and/or cross power spectra, (2) autocorrelations and/or cross correlations, (3) Fourier coefficients, (4) coherence functions, (5) transfer functions, and (6) histograms.
Brown, T. J.↗
Partial reflection data collection and processing using a small computer
Online data collection of the amplitudes of circularly polarized radio waves, partially reflected from the D region of the earth's ionosphere, has enabled the calculation of an electron-density profile in the height region 60-90 km. A PDP 15/30 digital computer with an analog to digital converter and magnetic tape as an intermediary storage device are used. The computer configuration, the software developed, and the preliminary results are described.
Birley, M. H.↗
A statistical package for computing time and frequency domain analysis
The spectrum analysis (SPA) program is a general purpose digital computer program designed to aid in data analysis. The program does time and frequency domain statistical analyses as well as some preanalysis data preparation. The capabilities of the SPA program include linear trend removal and/or digital filtering of data, plotting and/or listing of both filtered and unfiltered data, time domain statistical characterization of data, and frequency domain statistical characterization of data.
Brownlow, J.↗
Summary of the functions and capabilities of the structural analysis and matrix interpretive system computer program
Functions and capabilities of large capacity structural analysis and matrix interpretive system digital computer program to analyze frame and shell structures
STRUCTURAL DYNAMICS↗
Computer evaluation of topological formulas for network analysis
Single tree-finding program for digital computer evaluation of topological formulas for network analysis
Chan, S. P.↗
A high-speed algorithm for the computer generation of Fourier transforms.
Algorithm for high speed generation of Fourier transformations on digital computer
Andrews, H.↗
Computer program to predict the Newtonian aerodynamics of general bodies approximated by flat plates
Digital computer program for Newtonian aerodynamics of body composed of flat plate segments
Graham, R. E.↗
A topological approach to computer-aided sensitivity analysis
Sensitivities of any arbitrary system are calculated using general purpose digital computer with available software packages for transfer function analysis. Sensitivity shows how element variation within system affects system performance. Signal flow graph illustrates topological system behavior and relationship among parameters in system.
Chan, S. P.↗
DONAR - A computer processing system to extend ultrasonic pulse-echo testing.
A dedicated general purpose digital computer has been built on the principle of a sampled-data system to run an ultrasonic subsystem under programmed control. A most significant application is the ability to extract a signal from an interfering background. As illustrated in the paper, a 1 mm diameter transducer was used to measure the diameter of a 2.5 mm OD plastics tube with 0.4 mm wall thickness. Echoes from all four surfaces were displayed and the measurements indicated an uncertainty of less than 0.1 mm.
Lees, S.↗