Thesis advisors, Matthew Dennis Kelleher and K. T. Yang

Topics: COMPUTERIZED SIMULATION, MATHEMATICAL MODELS, SHIP FIRES, THESES

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Oct 7, 2015
10/15

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Houck, Richard Reid.

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Thesis advisors, Matthew Dennis Kelleher and K. T. Yang

Topic: COMPUTERIZED SIMULATION,MATHEMATICAL MODELS,SHIP FIRES,THESES

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May 31, 2011
05/11

by
Jedrich, Nick; Zimbelman, Darrell; Turczyn, Mark; Sills, Joel; Voorhees, Carl; Clapp, Bria

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This paper presents an overview of the Hubble Space Telescope (HST) Near Infrared Camera and Multi-Object Spectrometer (NICMOS) Cryo Cooler (MCC) system, a description of the micro-vibration characterization testing performed, and a discussion of the simulated performance. The NCC is a reverse Brayton cycle system that employs micro turbo-machinery to provide cooling to the NICMOS instrument. Extensive testing was conducted to quantify the expected on-orbit disturbances caused by the micro...

Topics: ALGORITHMS, QUEUEING THEORY, MATHEMATICAL MODELS, SCHEDULING, COMPUTERIZED SIMULATION

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288

Sep 20, 2010
09/10

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Woodward, Robert H.; Barnes, Robert A.; Mcclain, Charles R.; Esaias, Wayne E.; Barnes, William L.; Mecherikunnel, Ann T

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Post-launch stability monitoring of the Sea-viewing Wide Field-of-view Sensor (SeaWifs) will include periodic sweeps of both an onboard solar diffuser plate and the moon. The diffuser views will provide short-term checks and the lunar views will monitor long-term trends in the instrument's radiometric stability. Models of the expected sensor response to these observations were created on the SeaWiFS computer at the National Aeronautics and Space Administration's (NASA) Goddard Space Flight...

Topics: COMPUTERIZED SIMULATION, FLIGHT SIMULATION, HELICOPTERS, MATHEMATICAL MODELS, PARAMETER...

The DOD is becoming critically dependent on combat models (including simulations and war games)-even more dependent than in the past. There is considerable activity to improve model interoperability and capabilities for distributed war gaming. In contrast to this interest in model-related technology, there has been far too little interest in the substance of the models and the validity of the lessons learned from using them. In our view, the DOD does not appreciate that in many cases the models...

Topics: DTIC Archive, Davis, Paul K, DEFENSE ADVANCED RESEARCH PROJECTS AGENCY ARLINGTON VA, *COMPUTERIZED...

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2.7K

May 28, 2011
05/11

by
NON

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The First Biennial Space Biomedical Investigators' Workshop, held January 11-13, 1999, was unique in that it assembled, for the first time, a broad cross section of NASA-funded biomedical researchers to present the current status of their projects and their plans for future investigations. All principal investigators with active, or recently-completed ground-based projects in NASA's Biomedical Research and Countermeasures Program that were funded through NASA's Office of Life and Microgravity...

Topics: CONFERENCES, COMPUTERIZED SIMULATION, ROUTES, AIR TRANSPORTATION, POLICIES, AGREEMENTS,...

One of the primary results of this study is that wave group statistics observed in the ocean at depths greater than 10 m for a large range of wave conditions are consistent with linear theory. Wave group prediction models that do not include the effect of correlations between waves separated by several intervening waves underpredict the number of sequential large waves. On the other hand, a model that includes correlations of waves separated by as many as six intervening waves predicts...

Topics: DTIC Archive, Elgar, Steve, WASHINGTON STATE UNIV PULLMAN, *OCEAN SURFACE, MATHEMATICAL MODELS,...

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,...

The goal of this project is to enhance the flexibility and computational efficiency of the ESME Workbench and to work with NUWC-Newport to merge the NEMO and ESME approaches into the One Navy Model. The One Navy Model is intended to serve as the standard simulation system for use in predicting impacts of anthropogenic sound sources on marine life for environmental compliance purposes. Two versions of the One Navy Model will be created. The first version will designed for use by the US Navy and...

Topics: DTIC Archive, BOSTON UNIV BIOMEDICAL ENGINEERING, *OCEAN MODELS, ALGORITHMS, MARINE BIOLOGY,...

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234

May 31, 2011
05/11

by
Wennersten, Miriam Dvorak; Banes, Anthony Vince; Boegner, Gregory J.; Dougherty, Lamar; Edwards, Bernard L.; Roman, Josep

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NASA Goddard Space Flight Center has built an open architecture, 24 channel space flight GPS receiver. The CompactPCI PiVoT GPS receiver card is based on the Mitel/GEC Plessey Builder-2 board. PiVoT uses two Plessey 2021 correlators to allow tracking of up to 24 separate GPS SV's on unique channels. Its four front ends can support four independent antennas, making it a useful card for hosting GPS attitude determination algorithms. It has been built using space quality, radiation tolerant parts....

Topics: COMPUTER PROGRAMS, STATISTICAL ANALYSIS, SYMBOLIC PROGRAMMING, COMPUTERIZED SIMULATION, C...

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156

Jul 11, 2010
07/10

by
Shatalov, A. Y.; Kravchenko, T. A.; Aleksandrova, E. F.; Krivneva, G. G

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An analysis is made of the thermodynamic principles of the quinone and quinone-hydroquinone and metallic redoxites; a relationship is established between the equilibrium potentials and the degree of oxidative-reduction conversions. The hypothesis of the absence of an effect of the potential of a quinone-hydroquinone polymer on the equilibrium state is experimentally established. The potential of the metallic redoxite is measured.

Topics: COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, SPACECRAFT DOCKING, ACTUATORS, INPUT/OUTPUT ROUTINES,...

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May 31, 2011
05/11

by
Borowski, Stanley K.; Dudzinski, Leonard A

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The prospects for ''24 hour'' commuter flights to the Moon. similar to that portrayed in 2001: A Space Odyssey but on a more Spartan scale. are examined using two near term. ''high leverage'' technologies-liquid oxygen (LOX)-augmented nuclear thermal rocket (NTR) propulsion and ''lunar-derived'' oxygen (LUNOX) production. Iron-rich volcanic glass. or ''orange soil,'' discovered during the Apollo 17 mission to Taurus-Littrow. has produced a 4 oxygen yield in recent NASA experiments using...

Topics: ELECTROMAGNETIC RADIATION, REMOTE SENSING, STOCHASTIC PROCESSES, MATHEMATICAL MODELS, SPECTRAL...

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Jul 23, 2010
07/10

by
Badavi, Forooz F.; Norbury, John W.; Wilson, John W.; Townsend, Lawrence W

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Linear and harmonic potential models are used in the nonrelativistic Schroedinger equation to obtain article mass spectra for mesons as bound states of quarks. The main emphasis is on the linear potential where exact solutions of the S-state eigenvalues and eigenfunctions and the asymptotic solution for the higher order partial wave are obtained. A study of the accuracy of two analytical energy level formulas as applied to heavy mesons is also included. Cornwall's formula is found to be...

Topics: CATIONS, COMPUTERIZED SIMULATION, ION EXCHANGING, IONIC DIFFUSION, MATHEMATICAL MODELS, GLASS, ION...

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203

Jul 12, 2010
07/10

by
Jacobson, G. N.; Spinak, A

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The top down implementation plan used for the development of system performance test software during the Mark IV-A era is described. The plan is based upon the identification of the hierarchical relationship of the individual elements of the software design, the development of a sequence of functionally oriented demonstrable steps, the allocation of subroutines to the specific step where they are first required, and objective status reporting. The results are: determination of milestones,...

Topics: AIR TRAFFIC CONTROL, AIRCRAFT NOISE, AIRPORTS, NOISE POLLUTION, COMPUTERIZED SIMULATION,...

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112

Jul 26, 2010
07/10

by
Gregg, W. W.; Ardanuy, P. E.; Braun, W. C.; Vallette, B. J.; Bhartia, P. K.; Ray, S. N

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Computer simulations of orbital scenarios were performed to examine the effects of orbital altitude, equator crossing time, attitude uncertainty, and orbital eccentricity on ozone observations by future satellites. These effects were assessed by determining changes in solar and viewing geometry and earth daytime coverage loss. The importance of these changes on ozone retrieval was determined by simulating uncertainties in the TOMS ozone retrieval algorithm. The major findings are as follows:...

Topics: FLOW DISTRIBUTION, JET PROPULSION, MATHEMATICAL MODELS, TURBOMACHINERY, COMPUTATIONAL FLUID...

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279

Jun 21, 2010
06/10

by
NON

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Describing operations in radio astronomy, signal to noise ratio prediction, and tropospheric scattering refraction models for DSIF

Topics: DEEP SPACE NETWORK, MATHEMATICAL MODELS, SYSTEMS ENGINEERING, COMPUTERIZED SIMULATION, MONTE CARLO...

During the final year of this investigation we have finished several event studies that we considered necessary for the development of a tail magnetopause model and for the calibration of our simulation code. We have not reached the ultimate goal of the project, i.e., the development of an analytical tail magnetopause model. In the course of the investigation we have learned that such a model would be much more complex than we had anticipated. However, the investigations that we conducted...

Topics: NASA Technical Reports Server (NTRS), MAGNETOPAUSE, COMPUTERIZED SIMULATION, MODELS, MATHEMATICAL...

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241

May 21, 2011
05/11

by
NON

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A pulse phase locked loop system according to the present invention is described. A frequency generator such as a voltage controlled oscillator (VCO) generates an output signal and a reference signal having a frequency equal to that of the output signal. A transmitting gate gates the output frequency signal and this gated signal drives a transmitting transducer which transmits an acoustic wave through a material. A sample/hold samples a signal indicative of the transmitted wave which is...

Topics: FAULT TOLERANCE, MATHEMATICAL MODELS, MULTIPROCESSING (COMPUTERS), PERFORMANCE PREDICTION,...

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May 23, 2011
05/11

by
Carter, Arlen F.; Mayor, Shane D.; Ponsardin, Patrick; Hueser, Alene W., et al; Allen, Robert J.; Mayo, M. Neale; Butler, Carolyn F.; Grossman, Benoist E.; Ismail, Syed; Grant, William B.; Browell, Edward V.; Higdon, Noah S.

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An airborne differential absorption lidar (DIAL) system has been developed at the NASA Langley Research Center for remote measurements of atmospheric water vapor (H2O) and aerosols. A solid-state alexandrite laser with a 1-pm linewidth and greater than 99.85% spectral purity was used as the on-line transmitter. Solid-state avalanche photodiode detector technology has replaced photomultiplier tubes in the receiver system, providing an average increase by a factor of 1.5-2.5 in the...

Topics: EXTRAVEHICULAR MOBILITY UNITS, HUMAN FACTORS ENGINEERING, MOBILITY, STRENGTH, GARMENTS, SPACE...

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288

Jul 12, 2010
07/10

by
Kannel, J. W.; Tevaarwerk, J. L

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The state of stress beneath traction drive type of contacts were analyzed. Computing stresses and stress reversals on various planes for points beneath the surface were examined. The effect of tangential and axial friction under gross slip conditions is evaluated with the models. Evaluations were performed on an RC (rolling contact) tester configuration and it is indicated that the classical fatigue stresses are not altered by friction forces typical of lubricated contact. Higher values of...

Topics: LUMINOSITY, PERTURBATION, SOLAR PHYSICS, MATHEMATICAL MODELS, SOLAR CONSTANT, SOLAR DIAMETER,...

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240

May 29, 2011
05/11

by
Corcoran, M. F.; Ishibashi, K.; Swank, J. H.; Petre, R

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We solve the RXTE X-ray lightcurve of the extremely luminous and massive star eta Carinae with a colliding wind emission model to refine the ground-based orbital elements. The sharp decline to X-ray minimum at the end of 1997 fixes the date of the last periastron passage at 1997.95 /- 0.05, not 1998.13 as derived from ground-based radial velocities. This helps resolve a discrepancy between the ground-based radial velocities and spatially-resolved velocity measures obtained by STIS. The X-ray...

Topics: LANDING GEAR, FINITE ELEMENT METHOD, CRASH LANDING, LANDING SIMULATION, COMPUTERIZED SIMULATION,...

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,...

Our research effort has produced nine publications in peer-reviewed journals listed at the end of this report. The work reported here are in the following areas: (1) genetic network modeling; (2) autocatalytic model of pre-biotic evolution; (3) theoretical and computational studies of strongly correlated electron systems; (4) reducing thermal oscillations in atomic force microscope; (5) transcription termination mechanism in prokaryotic cells; and (6) the low glutamine usage in thennophiles...

Topics: NASA Technical Reports Server (NTRS), COMPLEX SYSTEMS, COMPUTERIZED SIMULATION, GENETICS,...

This slide presentation reviews the importance of Orbital debris engineering models. They are mathematical tools to assess orbital debris flux. It briefly reviews the history of the orbital debris engineering models, and reviews the new features in the current model (i.e., ORDEM2010).

Topics: NASA Technical Reports Server (NTRS), SPACE DEBRIS, DYNAMIC MODELS, MATHEMATICAL MODELS,...

This thesis uses renewal theory to investigate the Lanchester-type combat attrition process. The attrition process is analysed in detail and modelled as a so-called renewal process in which times between casualties are considered to be independently and identically distributed random variables. Other random variables that can be considered in the renewal process are examined, and the distributions of these random variables are determined in order to study the behavior of attrition process....

Topics: DTIC Archive, Cho,J K, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *LAND WARFARE, *ATTRITION,...

Turbulent flows subjected to various kinds of unsteady disturbances were simulated using a large-eddy-simulation computer code for flow in a channel. The disturbances were: a normal velocity expressed as a traveling wave on one wall of the channel; staggered blowing and suction distributions on the opposite walls of the channel; and oscillations of the mean flow through the channel. The wall boundary conditions were designed to simulate the effects of wakes of a stator stage passing through a...

Topics: NASA Technical Reports Server (NTRS), FREQUENCIES, REYNOLDS NUMBER, TURBOMACHINERY, TURBULENCE...

We will describe the PC based computer program CAGEN in its current state of development. It models the performance of many varieties of Magneto-Cumulative- Generators (MCG) which are energized with High Explosive (HE). CAGEN models helical or coaxial types (in the same generator, if desired) which have HE on the interior. Any materials and any HE types may be used. The cylindrical radius of the windings (or outer conductor) and the radius of the armature may vary with axial position. Variable...

Topics: DTIC Archive, CARE'N LLC TRACY CA, *PULSE GENERATORS, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION,...

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515

May 29, 2011
05/11

by
Markley, F. Landi

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This document is presentation in viewgraph form, which outlines the methods of determining spacecraft attitude. The presentation reviews several parameterizations relating to spacecraft attitude, such as Euler's Theorem, Rodriques parameters, and Euler-Rodriques parameters or Quaternion. Onboard attitude determination is the norm, using either single frame or filtering methods. The presentation reviews several mathematical representations of attitude. The mechanisms for determining attitude on...

Topics: MATHEMATICAL MODELS, FLEXIBILITY, PASSENGERS, COMPUTERIZED SIMULATION, GUSTS, AIRCRAFT SAFETY,...

Several results of the computer simulation of the behavior of the inner magnetosphere during the substorm-type event of 19 September 1976 are discussed. The model predicts a modest ring-current injection, in to about L=6, with total strength that is approximately equal to the strength estimated from the observed decrease in Dst. For the geosynchronous-orbit region on the dusk side, the model predicts a characteristic energy dispersion often observed by McIlwain and collaborators. The computed...

Topics: DTIC Archive, Harel,M, RICE UNIV HOUSTON TX, *ELECTRIC CURRENT, *MAGNETOSPHERE, MATHEMATICAL...

This research addresses mathematical and computational issues of particle methods for the three-dimensional simulation of flows at the nanoscale. The research addresses also the multi-scale physical phenomena in nanoscale flows that can be found in micro/nano fluidic devices and processes. The developments of an unstructured 3D Direct Simulation Monte Carlo (U3DSMC) method are presented, including a methodology for subsonic boundary conditions as well as the analysis of statistical fluctuations...

Topics: DTIC Archive, WORCESTER POLYTECHNIC INST MA, *FLUIDICS, *NANOTECHNOLOGY, MICROSTRUCTURE, MONTE...

The goal of this task is to discover a method to measure student learning and to determine if students are gaining proficiency in this pre-algebra activity. This method will augment our student assessment and challenge adaptation techniques by providing a better estimate of student ability and Zone of Proximal Development (ZPD). Earlier exploration of the MoneyBee Dataset indicated that the students score better as they attempt more problems, but because of student selection of problems, it was...

Topics: DTIC Archive, CHARLES RIVER ANALYTICS INC CAMBRIDGE MA, *EDUCATION, COMPUTERIZED SIMULATION,...

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248

May 31, 2011
05/11

by
Piatak, David J.; Cleckner, Craig S

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A new forced oscillation system has been installed and tested at NASA Langley Research Center's Transonic Dynamics Tunnel (TDT). The system is known as the Oscillating Turntable (OTT) and has been designed for the purpose of oscillating, large semispan models in pitch at frequencies up to 40 Hz to acquire high-quality unsteady pressure and loads data. Precisely controlled motions of a wind-tunnel model on the OTT can yield unsteady aerodynamic phenomena associated with flutter, limit cycle...

Topics: SCHEDULING, COMPUTERIZED SIMULATION, MATHEMATICAL MODELS, LOAD DISTRIBUTION (FORCES),...

This Technical Note provides requirements and guidance for the installation of the baselined microwave landing system (MLS) mathematical model. This model originated at the Massachusetts Institute of Technology, Lincoln Laboratory, during the late 1970's, and has been revised and baselined to facilitate future software support and improvements. Keywords Include: Microwave Landing System, MLS, Mathematical Model, and Installation Manual/MLS Mathematical Model.

Topics: DTIC Archive, Jones, Jesse D, MSI SERVICES INC WASHINGTON DC, *MICROWAVE LANDING SYSTEMS, COMPUTER...

The Attrition Rate Model is a model of how and at what rate individuals leave fallout shelters. This document is a description of the model and the methodology used to develop it. In addition, this document serves as a user's guide to the application of the model. Two complete examples are presented--a pencil-and-paper study of fallout casualties in a representative Soviet city, and an application to a red-on-blue SIDAC scenario. The complete programs necessary to run the SIDAC post-processor...

Topics: DTIC Archive, Kinrich,J H, BDM CORP MCLEAN VA, *MATHEMATICAL MODELS, *CASUALTIES, *FALLOUT...

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Jun 9, 2011
06/11

by
Wrbanek, John D.; Fralick, Gustave C.; Farmer, Serene C.; Sayir, Ali; Blaha, Charles A.; Gonzalez, Jose M

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The maximum use temperature of noble metal thin film thermocouples of 1100 C (2000 F) may not be adequate for use on components in the increasingly harsh conditions of advanced aircraft and next generation launch technology. Ceramic-based thermocouples are known for their high stability and robustness at temperatures exceeding 1500 C, but are typically found in the form of rods or probes. NASA Glenn Research Center is investigating the feasibility of ceramics as thin film thermocouples for...

Topics: COMPUTERIZED SIMULATION, REUSABLE LAUNCH VEHICLES, OPTIMIZATION, MATHEMATICAL MODELS, GENETIC...

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194

Jun 2, 2011
06/11

by
Dragovan, Mark, et al

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The DART is a system of two cylindrical-parabolic reflectors. One reflector will produce a line focus; two reflectors properly oriented will produce a point focus. For far-infrared/submillimeter missions, the DART presents a compelling new telescope architecture that is scalable to alrge apertures, and with it's large membrane area is well suited to passive cooling.

Topics: HYDRODYNAMICS, SPALLATION, ALUMINUM, IMPACT VELOCITY, COMPUTERIZED SIMULATION, MATHEMATICAL MODELS,...

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May 30, 2010
05/10

by
Stark, L.; Young, L. R

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Biocontrol systems - mathematical models for human manual control system through computer simulation and servoanalysis

Topics: BIOCONTROL SYSTEMS, COMPUTERIZED SIMULATION, MANUAL CONTROL, MATHEMATICAL MODELS, SERVOMECHANISMS,...

With the interest in jet propulsion at the end of World War II, aerodynamicists were challenged to develop mathematical models which could be used to design turbomachinery components for jets. NASA Lewis engineers and scientists played a major role in meeting this challenge. Some of their accomplishments are highlighted as well as those of others. Several problems are addressed which must be solved if jet propulsion technology is to advance.

Topics: NASA Technical Reports Server (NTRS), FLOW DISTRIBUTION, JET PROPULSION, MATHEMATICAL MODELS,...

The long-term goal of this project is to design and evaluate the components that will comprise a next generation mesoscale atmospheric model within the Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS(tm)1). It is anticipated that to meet future Navy requirements, next generation approaches to numerical techniques and physical parameterizations will be needed.

Topics: DTIC Archive, NAVAL RESEARCH LAB MONTEREY CA, *CLOUDS, COMPUTERIZED SIMULATION, NUMERICAL METHODS...

A NASA-developed meter and computer model offers the first verifiable way of measuring ride quality. It transforms individual noise and vibration elements into subjective units, then translates the units into a discomfort index. The meter was designed by Wyle Laboratories under NASA contract. It performs well and has been sold to major manufacturers.

Topics: NASA Technical Reports Server (NTRS), MATHEMATICAL MODELS, TECHNOLOGY UTILIZATION, MEASURING...

The performance of personnel in the augmentation and improvement of the interactive IMSIM information management simulation model is summarized. With this augmented model, NASA now has even greater capabilities for the simulation of computer system configurations, data processing loads imposed on these configurations, and executive software to control system operations. Through these simulations, NASA has an extremely cost effective capability for the design and analysis of computer-based data...

Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, INFORMATION MANAGEMENT, MATHEMATICAL...

The objective of this study was to perform theoretical modeling of mechanical deformation of the Earth's lithosphere making use of analytical solutions as well as numerical computer simulations.

Topics: NASA Technical Reports Server (NTRS), LITHOSPHERE, DEFORMATION, MATHEMATICAL MODELS, COMPUTERIZED...

We developed techniques to predict application execution times for instance-based learning with an average error of 33% of average run time. We developed techniques to predict queue wait times that included a simulation of scheduling algorithms and execution time predictions. We implemented these techniques for the NAS Origin cluster.

Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, QUEUEING THEORY, MATHEMATICAL MODELS, SCHEDULING,...

A study was conducted to determine the effects of degrading a rotating blade element rotor mathematical model suitable for real-time simulation of rotorcraft. Three methods of degradation were studied, reduction of number of blades, reduction of number of blade segments, and increasing the integration interval, which has the corresponding effect of increasing blade azimuthal advance angle. The three degradation methods were studied through static trim comparisons, total rotor force and moment...

Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, MATHEMATICAL MODELS, REAL TIME...

This paper is taken from the Final report of LTSS SAS-017 on Human Behaviour Representation in which A. v. Baeyer and J. Mylle gave this definition of HBR. Human behaviour (B) is a purposive reaction of a human being (P) to an idiosyncratic meaningful situation (S). Formally expressed: B= f(P,S). In words: the observed variability in behaviour is attributable to differences in the person's characteristics, to differences in the situation and/or to the interplay of both. Mathematically spoken:...

Topics: DTIC Archive, Dompke, Uwe, NATO C3 AGENCY THE HAGUE (NETHERLANDS), *HUMANS, *BEHAVIOR, NETHERLANDS,...

A control model describing a network flow hindered by multiple pure time (or transport) delays is formulated. Feedbacks connect each desired output with a single control sector situated at the origin. The dynamic formulation invokes the use of differential difference equations. This causes the characteristic equation of the model to consist of transcendental functions instead of a common algebraic polynomial. A general graphical criterion is developed to evaluate the stability of such a...

Topics: NASA Technical Reports Server (NTRS), FEEDBACK CONTROL, NETWORK ANALYSIS, COMPUTERIZED SIMULATION,...

Over the last 15 years, The Hydrologic Engineering Center (HEC) has been developing, applying, and distributing computer programs dealing with various aspects of hydrologic engineering, including reservoir analysis. The Center has developed several models for the simulation of reservoir operation and has supported the development of a water quality model for reservoirs and rivers. This paper presents review of model development and an overview of the capabilities and types of applications for...

Topics: DTIC Archive, Bonner,Vernon R, HYDROLOGIC ENGINEERING CENTER DAVIS CA, *RESERVOIRS, MATHEMATICAL...

With advances in hardware and software, it has become possible to reconstruct previously uncirculated computer simulation programs for the purpose of examining the advantages and disadvantages inherent in these simulations and which might be expected of computer simulation methodology in general. Advantages which are sometimes claimed for computer simulations include the extent to which the simulation (1) requires unambiguous statement of hypotheses; (2) elaborates the consequences of implicit...

Topics: DTIC Archive, NORTHWESTERN UNIV EVANSTON IL, *COMPUTERIZED SIMULATION, DECISION MAKING, GAME...

An interactive and versatile program was written for a VAX/VMS system to plot and manipulate the results of some simulation programs. It was first developed to display results from SPICE (a circuit simulation program) but has been modified to accept almost any data in ASCII files. An other version of the program was written for the plotting and manipulation of results during the simulations. This document provides a detailed description of the programs and their commands.

Topics: DTIC Archive, Dion, Marc, DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO), *MATHEMATICAL MODELS,...

The mathematical modeling and programming of a complete simulation program for a space station computer-steered high gain antenna are described. The program provides for reading input data cards, numerically integrating up to 50 first order differential equations, and monitoring up to 48 variables on printed output and on plots. The program system consists of a high gain antenna, an antenna gimbal control system, an on board computer, and the environment in which all are to operate.

Topics: NASA Technical Reports Server (NTRS), ANTENNA DESIGN, COMPUTERIZED SIMULATION, MATHEMATICAL MODELS,...