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The feasibility is evaluated of an evolutionary development for use of a single-axis gimbal star tracker from prior two-axis gimbal star tracker based system applications. Detailed evaluation of the star tracker gimbal encoder is considered. A brief system description is given including the aspects of tracker evolution and encoder evaluation. System analysis includes evaluation of star availability and mounting constraints for the geosynchronous orbit application, and a covariance simulation...
Topics: NASA Technical Reports Server (NTRS), ATTITUDE INDICATORS, GIMBALS, STAR TRACKERS, COMPUTER...
NASA engineers use simulation software to detect and prevent interference between different radio frequency (RF) systems on a rocket and satellite before launch. To speed up the process, Kennedy Space Center awarded SBIR funding to Champaign, Illinois-based Delcross Technologies LLC, which added a drag-and-drop feature to its commercial simulation software, resulting in less time spent preparing for the analysis.
Topics: NASA Technical Reports Server (NTRS), ARTIFICIAL SATELLITES, LAUNCHING, RADIO FREQUENCIES,...
A catalog is presented of subsystem and environment math models used or planned for space shuttle simulations. The purpose is to facilitate sharing of similar math models between shuttle simulations. It provides information on mach model requirements, formulations, schedules, and contact persons for further information.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, MATHEMATICAL MODELS, SPACE SHUTTLES,...
A self-consistent computer code for particle simulations which could treat both Landau and cyclotron interactions is discussed.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, ELECTRIC FIELDS, PARTICLE...
This slide presentation reviews the internship assignment of the author and his work on the GFSSP among other assignments.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, FLUID FLOW, COMPUTER PROGRAMS,...
During the investigation we have finalized the event studies that are necessary for the development of the magnetopause model and for the calibration of our simulation code.
Topics: NASA Technical Reports Server (NTRS), MAGNETOPAUSE, COMPUTERIZED SIMULATION, MODELS, CALIBRATING,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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An aerodynamic bicycle wheel developed by two DuPont engineers and a California company incorporates research into NASA airfoils. Computer modeling was accomplished with MSC/NASTRAN. Each of the three spokes in the wheel is, in effect, an airfoil, maximizing aerodynamic efficiency for racing.
Topics: NASA Technical Reports Server (NTRS), WHEELS, AERODYNAMIC CHARACTERISTICS, RECREATION, COMPUTER...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Topics on the slide include:quality, test coverage, functional criticality, exposure, criticality, and risk index.
Topics: NASA Technical Reports Server (NTRS), MODELS, RISK, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION,...
The NNEP is a computer program that is currently being used to simulate the thermodynamic cycle performance of almost all types of turbine engines by many government, industry, and university personnel. The NNEP uses arrays of input data to set up the engine simulation and component matching method as well as to describe the characteristics of the components. A preprocessing program (KONFIG) is described in which the user at a terminal on a time shared computer can interactively prepare the...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, FORTRAN,...
NASA Network Resource and Training Site
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Computer programs for the design of analog and digital flight control systems are documented. The program DIGADAPT uses linear-quadratic-gaussian synthesis algorithms in the design of command response controllers and state estimators, and it applies covariance propagation analysis to the selection of sampling intervals for digital systems. Program SCHED executes correlation and regression analyses for the development of gain and trim schedules to be used in open-loop explicit-adaptive control...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, FLIGHT CONTROL, USER MANUALS (COMPUTER...
The use of the coupled cavity traveling wave tube for space communications has led to an increased interest in improving the efficiency of the basic interaction process in these devices through velocity resynchronization and other methods. To analyze these methods, a flexible, large signal computer program for use on the IBM 360/67 time-sharing system has been developed. The present report is a users' manual for this program.
Topics: NASA Technical Reports Server (NTRS), SUBROUTINES, TRAVELING WAVE TUBES, USER MANUALS (COMPUTER...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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NASCAP simulates the charging process for a complex object in either tenuous plasma (geosynchronous orbit) or ground test (electron gun source) environment. Program control words, the structure of user input files, and various user options available are described in this computer programmer's user manual.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, SPACECRAFT CHARGING, USER MANUALS...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Tensor model order reduction, recursive tensor model identification, input design for tensor model identification, software development for nonlinear feedback control laws based upon tensors, and development of the CATNAP software package for tensor modeling, identification and simulation were studied. The last of these are discussed.
Topics: NASA Technical Reports Server (NTRS), FEEDBACK CONTROL, JET ENGINES, TENSORS, COMPUTER PROGRAMS,...
The digital IPS with wire cable and flex pivot nonlinearity is simulated on the digital computer to determine the effects of varying the sampling period T on the system stability, and to determine a range of optimal values of the parameters of the digital controller. The listing of the computer program is shown as well as the Dahl model for the flex pivot nonlinearity. For the wire cable nonlinearity, two ranges of values were used and the nominal values of the digital controller parameters are...
Topics: NASA Technical Reports Server (NTRS), CONTROLLERS, DIGITAL COMPUTERS, DIGITAL DATA, FUNCTIONAL...
Simulations were made at three month intervals to investigate the EOS mission performance over the four seasons of the year. The basic objectives of the study were: (1) to evaluate the ability of an EOS type system to meet a representative set of specific collection requirements, and (2) to understand the capabilities and limitations of the EOS that influence the system's ability to satisfy certain collection objectives. Although the results were obtained from a consideration of a two sensor...
Topics: NASA Technical Reports Server (NTRS), EARTH RESOURCES, LANDSAT SATELLITES, PROGRAMS, REMOTE...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Livingstone PathFinder (LPF) is a simulation-based computer program for verifying autonomous diagnostic software. LPF is designed especially to be applied to NASA s Livingstone computer program, which implements a qualitative-model-based algorithm that diagnoses faults in a complex automated system (e.g., an exploratory robot, spacecraft, or aircraft). LPF forms a software test bed containing a Livingstone diagnosis engine, embedded in a simulated operating environment consisting of a simulator...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, AUTONOMY, ALGORITHMS, ROBOTICS,...
The NASCAP computer code was used to compute the charging and discharging characteristics of a typical communications satellite in geosynchronous orbit. For the case of a severe substorm satellite surface differential charging in sunlight was found to be substantially less than that required to produce discharges in ground simulation studies. A discharge process was postulated involving discharges triggered at edges (or imperfection) followed by discharges to space. The characteristics of such...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, SPACECRAFT CHARGING, SYNCHRONOUS...
A computer model has been developed which evaluates the performance of a heat exchanger. This model is general enough to be used to evaluate many heat exchanger geometries and a number of different operating conditions. The film approach is used to describe condensation in the presence of noncondensables. The model is also easily expanded to include other effects like fog formation or suction.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, CONDENSING, HEAT EXCHANGERS,...
A brief introduction to the SIMLOG/TESTGN system of programs is given. Detailed instructions on how to use the system are also included. SIMLOG is a logic simulation program. TESTGN is a test pattern generation program.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, LOGIC CIRCUITS, MICROCOMPUTERS,...
The research supported under this award focuses on heterogeneous distributed computing for high-performance applications, with particular emphasis on computational aerosciences. The overall goal of this project was to and investigate issues in, and develop solutions to, efficient execution of computational aeroscience codes in heterogeneous concurrent computing environments. In particular, we worked in the context of the PVM[1] system and, subsequent to detailed conversion efforts and...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE SCIENCES, COMPUTER PROGRAMS, HETEROGENEITY,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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The next generation of rocket engine turbopumps is being developed by industry through Government-directed contracts. These turbopumps will use fluid film bearings because they eliminate the life and shaft-speed limitations of rolling-element bearings, increase turbopump design flexibility, and reduce the need for turbopump overhauls and maintenance. The design of the fluid film bearings for these turbopumps, however, requires sophisticated analysis tools to model the complex physical behavior...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, FLUID FILMS,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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As a Jet Propulsion Laboratory astronomer, John D. Callahan developed a computer program called Multimission Interactive Planner (MIP) to help astronomers analyze scientific and optical data collected on the Voyager's Grand Tour. The commercial version of the program called XonVu is published by XonTech, Inc. Callahan has since developed two more advanced programs based on MIP technology, Grand Tour and Jovian Traveler, which simulate Voyager and Giotto missions. The software allows astronomers...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, ASTRONOMY, EDUCATION, NASA SPACE PROGRAMS,...
The Simulation Computer System (SCS) is the computer hardware, software, and workstations that will support the Payload Training Complex (PTC) at the Marshall Space Flight Center (MSFC). The PTC will train the space station payload scientists, station scientists, and ground controllers to operate the wide variety of experiments that will be on-board the Freedom Space Station. The further analysis performed on the SCS study as part of task 2-Perform Studies and Parametric Analysis-of the SCS...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, PAYLOAD STATIONS, PAYLOADS, SPACE...
A new approach for determination of machine-tool settings for spiral bevel gears is proposed. The proposed settings provide a predesigned parabolic function of transmission errors and the desired location and orientation of the bearing contact. The predesigned parabolic function of transmission errors is able to absorb piece-wise linear functions of transmission errors that are caused by the gear misalignment and reduce gear noise. The gears are face-milled by head cutters with conical surfaces...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, GEAR TEETH,...
The user's manual for the LOGSIM Program is presented. All program options are explained and a detailed definition of the format of each input card is given. LOGSIM Program operations, and the preparation of LOGSIM input data are discused along with data card formats, postprocessor data cards, and output interpretation.
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, COMPUTER PROGRAMS, USER MANUALS...
Specifications of computer programs and simulation tests are described. Samples of input forms are shown, and flow charts are also included.
Topics: NASA Technical Reports Server (NTRS), CHECKOUT, COMPUTER PROGRAMS, SPACE SHUTTLES, USER MANUALS...
Information is provided necessary to use the LOVES Computer Program in its existing state, or to modify the program to include studies not properly handled by the basic model. The Users Guide defines the basic elements assembled together to form the model for servicing satellites in orbit. As the program is a simulation, the method of attack is to disassemble the problem into a sequence of events, each occurring instantaneously and each creating one or more other events in the future. The main...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, USER MANUALS (COMPUTER PROGRAMS),...
A user's guide is presented for the ACCESS-2 computer program. ACCESS-2 is a research oriented program which implements a collection of approximation concepts to achieve excellent efficiency in structural synthesis. The finite element method is used for structural analysis and general mathematical programming algorithms are applied in the design optimization procedure.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DYNAMIC STRUCTURAL ANALYSIS, FINITE...
The latest TEMPUS installation occurred in March, 1985. Another update is slated for early June, 1985. An updated User's Manual is in preparation and will be delivered approximately mid-June, 1985. NASA JSC has full source code listings and internal documentation for installed software. NASA JSC staff has received instruction in the use of TEMPUS. Telephone consultations have augmented on-site instruction.
Topics: NASA Technical Reports Server (NTRS), COMPUTER GRAPHICS, COMPUTER PROGRAMS, COMPUTERIZED...
A design program for an integrated Stirling cycle cryocooler was written on an IBM-PC computer. The program is easy to use and shows the trends and itemizes the losses. The calculated results were compared with some measured performance values. The program predicts somewhat optimistic performance and needs to be calibrated more with experimental measurements. Adding a multiplier to the friction factor can bring the calculated rsults in line with the limited test results so far available. The...
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, COMPUTER PROGRAMS, COOLERS, CRYOGENIC...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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The coding of high-performance fluids simulations requires significant knowledge of both numerical and computational details. The magnitude and complexity of low-level details is often enough to discourage many users of turbulence data wishing to study more important, higher-level fluid dynamical questions. These same complexities are often a practical barrier to simulation experts who develop, verify and maintain the codes which generate this data. Future fluids codes, with high resolution and...
Topics: NASA Technical Reports Server (NTRS), CODING, COMPUTER PROGRAMMING, COMPUTER PROGRAMS, PROGRAMMING...
NASA Network Resource and Training Site
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When Scientific-Atlanta had to design a new Cassegrain antenna, they found that the COSMIC program, "Machine Design of Cassegrain Feed System" allowed for computer simulation of the antenna's performance enabling pre-construction changes to be made. Significant cost savings were effected by the program.
Topics: NASA Technical Reports Server (NTRS), FEED SYSTEMS, CASSEGRAIN ANTENNAS, SOFTWARE ENGINEERING,...
NASA Network Resource and Training Site
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A computer simulation was developed to assess passenger survival during the post-crash evacuation of a transport category aircraft when fire is a major threat. The computer code, FIREVAC, computes individual passenger exit paths and times to exit, taking into account delays and congestion caused by the interaction among the passengers and changing cabin conditions. Simple models for the physiological effects of the toxic cabin atmosphere are included with provision for including more...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ACCIDENTS, PASSENGERS, SURVIVAL, COMPUTER PROGRAMS,...
The final report of NASA funded activities at Iowa State University (ISU) for the period between 1/96 and 1/99 includes two main areas of activity. The first is the development and delivery of an x-ray simulation package suitable for evaluating the impact of parameters affects the inspectability of an assembly of parts. The second area was the development of images processing tools to remove reconstruction artifacts in x-ray laminagraphy images. The x-ray simulation portion of this work was...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, X RAYS, COMPUTER PROGRAMS, IMAGE...
The derivation of simulated Jimsphere wind profiles from low-frequency rawinsonde data and a generated set of white noise data are presented. A computer program is developed to model high-resolution wind profiles based on the statistical properties of data from the Kennedy Space Center, Florida. Comparison of the measured Jimsphere data, rawinsonde data, and the simulated profiles shows excellent agreement.
Topics: NASA Technical Reports Server (NTRS), HIGH RESOLUTION, MODELS, RAWINSONDES, WIND PROFILES, COMPUTER...
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A flexible efficient computer code is being developed to simulate electrophoretic separation phenomena, in either a cylindrical or a rectangular geometry. The code will computer the evolution in time of the concentrations of an arbitrary number of chemical species, and of the temperature, pH distribution, conductivity, electric field, and fluid motion. Use of nonuniform meshes and fast accurate implicit time-stepping will yield accurate answers at economical cost.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, ELECTROKINETICS,...
The status of the Solar Heating and Cooling Project is reported. Modifications to the HISPER program are outlined, and recommendations concerning the validation study of HISPER are included.
Topics: NASA Technical Reports Server (NTRS), AIR CONDITIONING, COMPUTER PROGRAMS, SOLAR HEATING,...
The HYBRID2 program which computes the fuel and energy consumption of a hybrid vehicle with a bi-modal control strategy over specified component driving cycles is described. Fuel and energy consumption are computed separately for the two modes of operation. The program also computes yearly average fuel and energy consumption using a composite driving cycle which varies as a function of daily travel. The modelling techniques are described, and subroutines and their functions are given. The...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, ELECTRIC HYBRID VEHICLES, FUEL...
To investigate lubrication effects on bearing thermal performance, an investigation was performed to determine the feasibility of using the SKF program SHABERTH for simulating the performance of cryogenically lubricated ball bearings. As a part of this study, the particular application chosen for SHABERTH was to simulate the performance of the Space Shuttle main engine turbo-pump and pre-burner bearing system.
Topics: NASA Technical Reports Server (NTRS), BALL BEARINGS, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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A modified version of the Aerospace Vehicle Synthesis Program (VSP) to simulate a space shuttle on the computer is presented. The effects of various changes such as payload weight, and orbital velocity can be determined along with minimum costs in vehicle design. The program logic, and weight estimating equations are discussed, and an example case of a solid propellant boosted, drop tank orbiter is included to indicate the type of results produced by the VSP.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, SPACE SHUTTLES,...
NASA Network Resource and Training Site
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A software simulator was developed to help in the design of the LMSS. The simulator is used to study the characteristics and implementation requirements of the LMSS' configuration.
Topics: NASA Technical Reports Server (NTRS), PORTABLE EQUIPMENT, TELEPHONES, COMPUTER PROGRAMS,...
The radiation models were compared on the basis of the approaches used for the transport calculations and absorption coefficients and of results obtained for the radiation flux profiles and spectral distributions. The calculated results were for shock layer conditions representative of manned earth reentry from an interplanetary mission. The three models are RATRAP, RADICAL, and MDAC. The results show that significant differences exist in the radiation flux computed by the three models. The...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC HEATING, COMPUTERIZED SIMULATION, HYPERSONIC...
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To help reduce the time needed to analyze data from missions like those studying the Sun, Goddard Space Flight Center awarded SBIR funding to Tech-X Corporation of Boulder, Colorado. That work led to commercial technologies that help scientists accelerate their data analysis tasks. Thanks to its NASA work, the company doubled its number of headquarters employees to 70 and generated about $190,000 in revenue from its NASA-derived products.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTER GRAPHICS, DATA PROCESSING,...
NASA Network Resource and Training Site
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The goal of this project is to develop a magneto-hydrodynamic (MHD) computer code for simulation of the VASIMR engine. This code is designed be easy to modify and use. We achieve this using the Cactus framework, a system originally developed for research in numerical relativity. Since its release, Cactus has become an extremely powerful and flexible open source framework. The development of the code will be done in stages, starting with a basic fluid dynamic simulation and working towards a...
Topics: NASA Technical Reports Server (NTRS), MAGNETOHYDRODYNAMICS, COMPUTER PROGRAMS, COMPUTERIZED...
An algorithm for computationally lightweight simulation of automated air traffic control (ATC) at a busy airport has been derived. The algorithm is expected to serve as the basis for development of software that would be incorporated into flight-simulator software, the ATC component of which is not yet capable of handling realistic airport loads. Software based on this algorithm could also be incorporated into other computer programs that simulate a variety of scenarios for purposes of training...
Topics: NASA Technical Reports Server (NTRS), AIR TRAFFIC CONTROL, COMPUTER PROGRAMS, FLIGHT PLANS,...
A finite-difference computer program (COSIM) has been written which models the one-dimensional, diffusional transport associated with high-temperature oxidation and interdiffusion of overlay-coated substrates. The program predicts concentration profiles for up to three elements in the coating and substrate after various oxidation exposures. Surface recession due to solute loss is also predicted. Ternary cross terms and concentration-dependent diffusion coefficients are taken into account. The...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, OXIDATION, COMPUTERIZED SIMULATION,...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE ENGINEERING, CONTROL, MULTIPROCESSING (COMPUTERS),...
The longitudinal dynamics of a medium range twin-jet or tri-jet transport aircraft are simulated. For the climbing trajectory, the thrust is constrained to maximum value, and for descent, the thrust is set at idle. For cruise, the aircraft is held in the trim condition. For climb or descent, the aircraft is steered to follow either (a) a fixed profile which is input to the program or (b) a profile computed at the beginning of that segment of the run. For climb, the aircraft is steered to...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT CONTROL, LONGITUDINAL CONTROL, TRANSPORT AIRCRAFT,...
In this paper, we analyze the performance of Transmission Control Protocol (TCP) in a network that consists of both satellite and terrestrial components. One method, proposed by outside research, to improve the performance of data transfers over satellites is to use a performance enhancing proxy often dubbed 'spoofing.' Spoofing involves the transparent splitting of a TCP connection between the source and destination by some entity within the network path. In order to analyze the impact of...
Topics: NASA Technical Reports Server (NTRS), PROTOCOL (COMPUTERS), COMPUTERIZED SIMULATION, COMPUTER...
The Transient Cryogen Transfer Computer Program (TCTP) developed and verified for LOX systems by analyses of Skylab S-1B stage loading data from John F. Kennedy Space Center launches was extended to include hydrogen as the working fluid. The feasibility of incorporating TCTP into the space shuttle main engine dynamic model was studied. The program applications are documented.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, LIQUID HYDROGEN, SPACE SHUTTLES,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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NASA's Jet Propulsion Laboratory has developed a computer model for planning future health care needs in the Los Angeles area. The model integrates demographic health and other data to provide rational projections of hospital bed and physician specialty requirements.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, HEALTH, HOSPITALS, PHYSICIANS
A heating fixture for simulating the heating and environment encountered by the Centaur standard shroud (CSS) during its ascent through the earth's atmosphere is discussed. A computer program was developed to provide a means of determining the overall temperature profile of a free-skin model of the CSS during the heating portion of the heated jettison tests. The program treats the energy contribution of each lamp on the heater to various points on the CSS surface. The analytic model was...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, HIGH TEMPERATURE TESTS, JETTISON...
A computer program manages large, hierarchical sets of input and output (I/O) parameters (typically, sequences of alphanumeric data) involved in computational simulations in a variety of technological disciplines. This program represents sets of parameters as structures coded in object-oriented but otherwise standard American National Standards Institute C language. Each structure contains a group of I/O parameters that make sense as a unit in the simulation program with which this program is...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DATA STRUCTURES, DATA MANAGEMENT,...
This viewgraph presentation gives an overview on recent improvements in the Finite Difference Navier Stokes (FDNS) computational fluid dynamics (CFD) code and its associated process. The development of a utility, PreViewer, has essentially eliminated the creeping of simple human error into the FDNS Solution process. Extension of PreViewer to encapsulate the Domain Decompression process has made practical the routine use of parallel processing. The combination of CVS source control and ATS...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, FINITE DIFFERENCE THEORY,...
A new approach is proposed for the local synthesis of spiral bevel gears. The approach provides contact at the mean contact point with the desired deviation of the transmission error function by a predesigned parabolic function. The orientation of the contact path on the gear tooth surface and the length of the major axis of the instantaneous contact ellipse are also included in the analysis. A tooth contact analysis (TCA) computer program was developed to simulate meshing and contact of the...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, ERROR FUNCTIONS, GEAR TEETH, GEARS,...
Te RESFAC2 version of the Thermal Response Factor Program (RESFAC) is the result of numerous modifications and additions to the original RESFAC. These modifications and additions have significantly reduced the program's computational time requirement. As a result of this work, the program is more efficient and its code is both readable and understandable. This report describes what a thermal response factor is; analyzes the original matrix algebra calculations and root finding techniques;...
Topics: NASA Technical Reports Server (NTRS), ALGEBRA, COMPUTATION, COMPUTER PROGRAMS, CONDUCTIVE HEAT...
NASA Network Resource and Training Site
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A continuous flexible body nonlinear dynamics computer program is used for simulating the spinning mode performance of a spacecraft under applied control torques. The program takes into account the continuous flexible nature of the antennas by representing deflections in terms of shape functions and integrated the spatial dependence in the formulation of the equations of motion. Comparison of RAE flight data on roll, pitch, and yaw with predictions of the computer program in the gravity...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, RADIO ASTRONOMY EXPLORER SATELLITE,...
A set of software programs which simulates a (255,223) Reed-Solomon encoder/decoder pair is described. The transform decoder algorithm uses a modified Euclid algorithm, and closely follows the pipeline architecture proposed for the hardware decoder. Uncorrectable error patterns are detected by a simple test, and the inverse transform is computed by a finite field FFT. Numerical examples of the decoder operation are given for some test codewords, with and without errors. The use of the software...
Topics: NASA Technical Reports Server (NTRS), CODERS, COMPUTERIZED SIMULATION, DECODERS, INFORMATION...
NASA Network Resource and Training Site
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A computerized anatomical man (CAM) model, representing the most detailed and anatomically correct geometrical model of the human body yet prepared, has been developed for use in analyzing radiation dose distribution in man. This model of a 50-percentile standing USAF man comprises some 1100 unique geometric surfaces and some 2450 solid regions. Internal body geometry such as organs, voids, bones, and bone marrow are explicitly modeled. A computer program called CAMERA has also been developed...
Topics: NASA Technical Reports Server (NTRS), ANATOMY, COMPUTERIZED SIMULATION, HUMAN BODY, COMPUTER...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Lunar gravitational properties were analyzed along with the development of flat moon and curved moon computer models. Gravity anomalies and mascons were given particular attention. Geophysical and geological considerations were included, and comparisons were made between the gravitional fields of the Earth, Mars, and the Moon.
Topics: NASA Technical Reports Server (NTRS), GRAVITY ANOMALIES, LUNAR CRUST, LUNAR GRAVITATION, MASCONS,...
A FORTRAN coded computer program and method to predict the reaction control fuel consumption statistics for a three axis stabilized rocket vehicle upper stage is described. A Monte Carlo approach is used which is more efficient by using closed form estimates of impulses. The effects of rocket motor thrust misalignment, static unbalance, aerodynamic disturbances, and deviations in trajectory, mass properties and control system characteristics are included. This routine can be applied to many...
Topics: NASA Technical Reports Server (NTRS), COMBUSTION CONTROL, COMPUTER PROGRAMS, FUEL CONSUMPTION,...
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The objective of the Project Analysis and Integration Area (PA&I) is to support the planning, analysis, integration, and decision making activities of the Flat-plate Solar Array FSA) Project. Accordingly, PA&I supports the Project by developing and documenting Project plans based, in part, on the technical and economic assessments performed by PA&I of the various technical options. Goals for module technical performance and costs, derived from National Photovoltaics Program goals,...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, COST ESTIMATES, DECISION MAKING,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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A programmer's manual is reported for a Logic Simulator (LOGSIM) computer program that is a large capacity event simulator with the capability to accurately simulate the effects of certain unknown states, rise and fall times, and floating nodes in large scale metal oxide semiconductor logic circuits. A detailed description of the software with flow charts is included within the report.
Topics: NASA Technical Reports Server (NTRS), CHECKOUT, COMPUTER PROGRAMS, LOGIC DESIGN, MANUALS,...
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The aerosol generator and the charge flow devices (CFD) chamber which were designed for zero-gravity operation was analyzed. Characteristics of the CFD chamber and aerosol generator which would be useful for cloud physics experimentation in a one-g as well as a zero-g environment are documented. The Collision type of aerosol generator is addressed. Relationships among the various input and output parameters are derived and subsequently used to determine the requirements on the controls of the...
Topics: NASA Technical Reports Server (NTRS), AEROSOLS, CHARGE FLOW DEVICES, CLOUD PHYSICS, WEIGHTLESSNESS,...
The development of commercial finite element software is addressed. This software provides practical tools that are used in an astonishingly wide range of engineering applications that include critical aspects of the safety evaluation of nuclear power plants or of heavily loaded offshore structures in the hostile environments of the North Sea or the Arctic, major design activities associated with the development of airframes for high strength and minimum weight, thermal analysis of electronic...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION,...
The theory and user instructions for an optimization code based on the method of feasible directions are presented. The code was written for wide distribution and ease of attachment to other simulation software. Although the theory of the method of feasible direction was developed in the 1960's, many considerations are involved in its actual implementation as a computer code. Included in the code are a number of features to improve robustness in optimization. The search direction is obtained by...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION,...
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A visually-based deictic primative used as an elementary command set for general purpose navigation was investigated. It was shown that a simple 'follow your eyes' scenario is sufficient for tracking a moving target. Limitations of velocity, acceleration, and modeling of the response of the mechanical systems were enforced. Realistic paths of the robots were produced during the simulation. Scientists could remotely command a planetary rover to go to a particular rock formation that may be...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION,...
An evaluation of the ACTION computer code on an aircraft like structure is presented. This computer program proved adequate in predicting gross response parameters in structures which undergo severe localized cross sectional deformations.
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ACCIDENTS, COMPUTERIZED SIMULATION, CRASHES,...
A computer model was developed which can generate realistic concentration versus time profiles of the chemical species formed during photooxidation of hydrocarbon polymers using as input data a set of elementary reactions with corresponding rate constants and initial conditions. The results of computer simulation have been shown to be consistent with the general experimental observations of the photooxidation of polyethylene exposed to sunlight at ambient temperatures. The useful lifetime (5%...
Topics: NASA Technical Reports Server (NTRS), CHEMICAL REACTIONS, COMPUTER PROGRAMS, COMPUTERIZED...
Virtual reality (VR) is an exciting use of advanced hardware and software technologies to achieve an immersive simulation. Until recently, the majority of virtual environments were merely 'fly-throughs' in which a user could freely explore a 3-dimensional world or a visualized dataset. Now that the underlying technologies are reaching a level of maturity, programmers are seeking ways to increase the complexity and interactivity of immersive simulations. In most cases, interactivity in a virtual...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, HUMAN-COMPUTER INTERFACE, KNOWLEDGE...
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The purpose of QASE RT is to enable system analysts and software engineers to evaluate performance and reliability implications of design alternatives. The program resulted from two Small Business Innovation Research (SBIR) projects. After receiving a description of the system architecture and workload from the user, QASE RT translates the system description into simulation models and executes them. Simulation provides detailed performance evaluation. The results of the evaluations are service...
Topics: NASA Technical Reports Server (NTRS), ARCHITECTURE (COMPUTERS), COMPUTER PROGRAMS, COMPUTERIZED...
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Applying ITS technology to the shuttle diagnostics would not require the rigor of the Petri Net representation, however it is important in providing the animated simulated portion of the interface and the demands placed on the system to support the training aspects to have a homogeneous and consistent underlying knowledge representation. By keeping the diagnostic rule base, the hardware description, the software description, user profiles, desired behavioral knowledge, and the user interface in...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTER SYSTEMS PERFORMANCE, KNOWLEDGE...
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Calculating the line of intersection between two three-dimensional objects and using the information to generate a third object is a key element in a geometry development system. Techniques are presented for the generation of three-dimensional objects, the calculation of a line of intersection between two objects, and the construction of a resultant third object. The objects are closed surfaces consisting of adjacent bicubic parametric patches using Bezier basis functions. The intersection...
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, COMPUTER GRAPHICS, DRAWINGS,...
A finite-difference computer program (COSIM) has been written which models the one-dimensional, diffusional transport associated with high-temperature oxidation and interdiffusion of overlay-coated substrates. The program predicts concentration profiles for up to three elements in the coating and substrate after various oxidation exposures. Surface recession due to solute loss is also predicted. Ternary cross terms and concentration-dependent diffusion coefficients are taken into account. The...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, DIFFUSION...
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The objectives of this work are: (1) to extend the technique of direct numerical simulations to turbulent, chemically reacting flows, (2) to test the validity of the method by comparing computational results with laboratory data, and (3) to use the simulations to gain a better understanding of the effects of turbulence on chemical reactions. The effects of both the large scale structure and the smaller scale turbulence on the overall reaction rates are addressed. The relationship between...
Topics: NASA Technical Reports Server (NTRS), CHEMICAL REACTIONS, COMPUTERIZED SIMULATION, FLOW...
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SPACESIM is a computer program for detailed simulation of operations at a spaceport. SPACESIM is being developed to greatly improve existing spaceports and to aid in designing, building, and operating future spaceports, given that there is a worldwide trend in spaceport operations from very expensive, research- oriented launches to more frequent commercial launches. From an operational perspective, future spaceports are expected to resemble current airports and seaports, for which it is...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, LAUNCHING BASES,...
A computer program for performing frequency analysis of time history data is presented. The program uses circular convolution and the fast Fourier transform to calculate power density spectrum (PDS) of time history data. The program interfaces with the advanced continuous simulation language (ACSL) so that a frequency analysis may be performed on ACSL generated simulation variables. An example of the calculation of the PDS of a Van de Pol oscillator is presented.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, FREQUENCY...
A flight simulation system with graphics and software on Silicon Graphics computer workstations has been installed in the Flight Vehicle Design Laboratory at Tuskegee University. The system has F-15E flight simulation software from NASA Dryden which uses the graphics of SGI flight simulation demos. On the system, thus installed, a study of pilot induced oscillations is planned for future work. Preliminary research is conducted by obtaining two sets of straight level flights with pilot in the...
Topics: NASA Technical Reports Server (NTRS), PILOT INDUCED OSCILLATION, COMPUTER PROGRAMS, COMPUTERIZED...
The Application Programming Interface (API) for the Crew Exploration Vehicle (CEV) Aerodynamic Database has been developed to provide the developers of software an easily implemented, fully self-contained method of accessing the CEV Aerodynamic Database for use in their analysis and simulation tools. The API is programmed in C and provides a series of functions to interact with the database, such as initialization, selecting various options, and calculating the aerodynamic data. No special...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMICS, COMPUTERIZED SIMULATION, APPLICATION...
Information necessary to use the LOVES computer program in its existing state or to modify the program to include studies not properly handled by the basic model is provided. A users guide, a programmers manual, and several supporting appendices are included.
Topics: NASA Technical Reports Server (NTRS), MANNED SPACECRAFT, SPACE MAINTENANCE, USER MANUALS (COMPUTER...
The Parachute Refurbishment Facility Model was created to reflect the flow of hardware through the facility using anticipated start and delivery times from a project level IV schedule. Distributions for task times were built using historical build data for SFOC work and new data generated for CLV/ARES task times. The model currently processes 633 line items from 14 SFOC builds for flight readiness, 16 SFOC builds returning from flight for defoul, wash, and dry operations, 12 builds for CLV...
Topics: NASA Technical Reports Server (NTRS), PARACHUTES, TEST FACILITIES, MANUFACTURING, COMPUTER...
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Ndarts software provides algorithms for computing quantities associated with the dynamics of articulated, rigid-link, multibody systems. It is designed as a general-purpose dynamics library that can be used for the modeling of robotic platforms, space vehicles, molecular dynamics, and other such applications. The architecture and algorithms in Ndarts are based on the Spatial Operator Algebra (SOA) theory for computational multibody and robot dynamics developed at JPL. It uses minimal, internal...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, COMPUTER PROGRAMS, CONTROL...
The details of the orbiter altitude attainable at the approach and landing tests (ALT) interface determined by the approach and landing shuttle engineering simulation (manned) were documented. The analysis culminated in the verification of the trends observed in a similar analysis performed previously on the space vehicle dynamics simulation (unmanned). Altitude variations attributable to pilot steering variability ranged between 492 ft higher to 383 ft lower. The requirement for this...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, FLIGHT...
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Consider some of the control system design methods for plants with nonlinear dynamics. If the nonlinearity is weak relative to the size of the operating region, then the linear methods apply directly. Fixed-gain design may be feasible even for significant nonlinearities. It may be possible to find a single gain which provides adequate control of the linear models at several perturbation points. If the nonlinearity is restricted to a sector, that fact may be used to obtain a fixed-gain...
Topics: NASA Technical Reports Server (NTRS), AVIONICS, CONTROL THEORY, NONLINEAR SYSTEMS, REGULATORS,...
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The numerical simulation of mesoscale precipitation as well as the development of software and appropriate computer techniques are investigated. The development of a mesoscale model and the means to incorporate meteorological data into the model are examined.
Topics: NASA Technical Reports Server (NTRS), COMPUTER TECHNIQUES, COMPUTERIZED SIMULATION, MATHEMATICAL...
The PAN AIR computer code was investigated as a tool for predicting closely coupled aerodynamic and propulsive flowfields of arbitrary configurations. The NASA/Ames V/STOL fighter model, a configuration of complex geometry, was analyzed with the PAN AIR code. A successful solution for this configuration was obtained when the nozzle exit was treated as an impermeable surface and no wakes were included around the nozzle exit. When separated flow was simulated from the end of the nacelle,...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC CONFIGURATIONS, COMPUTERIZED SIMULATION, FLOW...
This paper describes DIGTEM (digital turbofan engine model), a computer program that simulates two spool, two stream (turbofan) engines. DIGTEM was developed to support the development of a real time multiprocessor based engine simulator being designed at the Lewis Research Center. The turbofan engine model in DIGTEM contains steady state performance maps for all the components and has control volumes where continuity and energy balances are maintained. Rotor dynamics and duct momentum dynamics...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, FORTRAN, MICROPROCESSORS, REAL TIME...
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An example of a minimal complexity simulation helicopter math model is presented. Motivating factors are the computational delays, cost, and inflexibility of the very sophisticated math models now in common use. A helicopter model form is given which addresses each of these factors and provides better engineering understanding of the specific handling qualities features which are apparent to the simulator pilot. The technical approach begins with specification of features which are to be...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, CONTROLLABILITY, FLIGHT SIMULATION,...
The validation of the algorithms for controlling the space-to-ground antenna subsystem for Space Station Alpha is an important step in assuring reliable communications. These algorithms have been developed and tested using a simulation environment based on a computer-aided design tool that can provide a time-based execution framework with variable environmental parameters. Our work this summer has involved the exploration of this environment and the documentation of the procedures used to...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, ANTENNA DESIGN, COMMUNICATION, COMPUTER AIDED...
A research and development (R&D) project often involves a number of decisions that must be made concerning which subset of systems or tasks are to be undertaken to achieve the goal of the R&D project. To help in this decision making, SIMRAND (SIMulation of Research ANd Development Projects) is a methodology for the selection of the optimal subset of systems or tasks to be undertaken on an R&D project. Using alternative networks, the SIMRAND methodology models the alternative subsets...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMMING, COMPUTER PROGRAMS, DECISION MAKING,...
Lockheed-developed fluid dynamics numerical analysis computer codes were utilized to numerically simulate the development of convective motion in experiment configurations of interest to NASA.
Topics: NASA Technical Reports Server (NTRS), FLUID DYNAMICS, NUMERICAL ANALYSIS, SPACE INDUSTRIALIZATION,...
The research performed this summer focussed on the development of a predictive model for the loading of liquid oxygen (LO2) into the external tank (ET) of the shuttle prior to launch. A predictive model can greatly aid the operational personnel since instrumentation aboard the orbiter and ET is limited due to weight constraints. The model, which focuses primarily on the orbiter section of the system was developed using a block diagram based simulation language known as VisSim. Simulations were...
Topics: NASA Technical Reports Server (NTRS), BLOCK DIAGRAMS, EXTERNAL TANKS, LIQUID OXYGEN, MATHEMATICAL...
A computer program called HOPI was developed to predict reorientation flow dynamics, wherein liquids move from one end of a closed, partially filled, rigid container to the other end under the influence of container acceleration. The program uses the simplified marker and cell numerical technique and, using explicit finite-differencing, solves the Navier-Stokes equations for an incompressible viscous fluid. The effects of turbulence are also simulated in the program. HOPI can consider curved as...
Topics: NASA Technical Reports Server (NTRS), ACCELERATION (PHYSICS), COMPUTER PROGRAMS, FLOW...
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The use of a docking-system computer program in analyzing the dynamic environment produced by two impacting spacecraft and the attitude control systems is discussed. Performance studies were conducted to determine the mechanism load and capture sensitivity to parametric changes in the initial impact conditions. As indicated by the studies, capture latching is most sensitive to vehicle angular-alinement errors and is least sensitive to lateral-miss error. As proved by load-sensitivity studies,...
Topics: NASA Technical Reports Server (NTRS), APOLLO SOYUZ TEST PROJECT, COMPUTERIZED SIMULATION, DYNAMIC...
A new general-purpose optimization program for engineering design is described. ADS (Automated Design Synthesis - Version 1.10) is a FORTRAN program for solution of nonlinear constrained optimization problems. The program is segmented into three levels: strategy, optimizer, and one-dimensional search. At each level, several options are available so that a total of over 100 possible combinations can be created. Examples of available strategies are sequential unconstrained minimization, the...
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, COMPUTER PROGRAMS, LAGRANGE...
An interactive grid generation program, INGRID, is investigated and evaluated. A description of the task and work performed, a description and evaluation of INGRID, and a discussion of the possibilities for bringing INGRID into the NASA and Numerical Aerodynamic Simulator (NAS) computing environments is included. The interactive grid generation program was found to be a viable approach for grid generation and determined that it could be converted to work in the NAS environment but that INGRID...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL GRIDS, COMPUTER PROGRAMS, COMPUTERIZED...
The Navy/NASA Engine Performance (NNEP) is a general purpose computer program currently employed by government, industry and university personnel to simulate the thermodynamic cycles of turbine engines. NNEP is a modular program which has the ability to evaluate the performance of an arbitrary engine configuration defined by the user. In 1979, a program to calculate engine weight (WATE-2) was developed by Boeing's Military Division under NASA contract. This program uses a preliminary design...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, EFFICIENCY,...
Natural convection in a spherical container with cooling at the center was numerically simulated using a numerical fluid dynamics computer program. The numerical analysis was simplified by assuming axisymmetric flow in the spherical container, with the symmetry axis being a sphere diagonal parallel to the gravity vector. This axisymmetric spherical geometry was intended as an idealization of the proposed Lal/Kroes crystal growing experiment to be performed on Spacelab. Results were obtained for...
Topics: NASA Technical Reports Server (NTRS), AXISYMMETRIC FLOW, COMPUTERIZED SIMULATION, CONVECTION,...
A technique for wideswath synthetic aperture radar coverage, was implemented into the OSS (orbital sar simulation) computer programs. The OSS modifications, and the implementation and simulation of the concept are described. The wideswath technique uses formed multiple antenna beams.
Topics: NASA Technical Reports Server (NTRS), ANTENNA RADIATION PATTERNS, SPACECRAFT ORBITS, SYNTHETIC...
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A methodology for automatic mathematical modeling is described. The major objective is to create a very friendly environment for engineers to design, maintain and verify their model and also automatically convert the mathematical model into FORTRAN code for conventional computation. A demonstration program was designed for modeling the Space Shuttle Main Engine simulation mathematical model called Propulsion System Automatic Modeling (PSAM). PSAM provides a very friendly and well organized...
Topics: NASA Technical Reports Server (NTRS), ARTIFICIAL INTELLIGENCE, COMPUTER AIDED DESIGN, COMPUTER...