| KPLOT - A Computer Program for Contour Plotting High Frequency Static Pressure Experimental Data |
JUN 90 |
25 pages |
| Authors:
Steven L. Puterbaugh; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
 | This report describes a FORTRAN computer program developed to create a contour plot of experimentally determined static pressure distributions existing over the blade tips of a transonic compressor rotor. The input data used by the program was the digitized, ensemble averaged output of casing mounted high frequency response pressure transducers. The resulting plots give the compressor designer important information regarding shock position and strength and wave pattern. |
|
| An Aggregator Preprocessor for NAVMOD |
JUN 90 |
|
| Authors:
Eleanor L. Schwartz; INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA
|
 | This paper documents an aggregator preprocessor computer program that has been developed to facilitate certain aspects of data generation for the NAVMOD naval model. NAVMOD simulates only a limited number of types of different naval resources; input data for NAVMOD combat must be expressed in terms of these types. The aggregator preprocessor reads data for actual types of naval weapons or other resources. Using a weighted averaging technique, the computer ... |
|
| Sounder Update and Field Strength Software Modifications for Special Operations Radio Frequency Management System (SORFMS). Volume 1. Program Descriptions and Testing |
JUN 90 |
112 pages |
| Authors:
SYSTEMS EXPLORATION INC SAN DIEGO CA
|
| The purpose of this document is to provide information about the Special Operations Radio Frequency Management System (SORFMS) model enhancements produced by Systems Exploration, Inc. The enhancements include the incorporation of a Sounder Update (SU) model and an improved version of the Field Strength (FS) model. The SU model is an adaptation and translation to FORTRAN of the Army PROPHET Evaluation System (APES) BASIC model. The FS enhancements involve modification ... |
|
| Fortran Programs for Weapon Systems Analysis |
JUN 90 |
98 pages |
| Authors:
Fred L. Bunn; Joseph M. Olah; Michele Ritondo; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This report documents small Fortran 77 routines which are useful to those interested in ballistics and related work. The programs include skeletal combat models, a set of discrete-event timing routines, mathematical and statistical routines, hit probability routines, acquisition routines, ballistic routines, and others. All of the program, subroutines, and functions are in the public domain and may be copied freely. Government agencies and contractors may request copies from the Ballistic ... |
|
| Specification for a Standard Electromagnetic Propagation Model |
JUN 90 |
64 pages |
| Authors:
C. P. Hattan; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
|
| A standard electromagnetic (EM) propagation model has been developed at the Naval Ocean Systems Center. It provides the user with a method of assessing EM propagation from 100 MHz to 20 GHz in the marine environment for a variety of atmospheric conditions. The software implementation of the model returns the pattern propagation factor in describes when a user supplies the model with the proper environment and EM system inputs. The ... |
|
| Error Control Coding for Multi-Frequency Modulation |
JUN 90 |
81 pages |
| Authors:
Robert W. Ives; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Multi-frequency modulation (MFM) has been developed at NPS using both quadrature-phase-shift-keyed (QPSK) and quadrature-amplitude-modulated (QAM) signals with good bit error performance at reasonable signal-to-noise ratios. Improved performance can be achieved by the introduction of error control coding. This report documents a Fortran simulation of the implementation of error control coding into an MFM communication link with additive white Gaussian noise. Four Reed-Solomon codes were incorporated, two for 16-QAM and two ... |
|
| DECOMP: An Implementation of Dantzig-Wolfe Decomposition for Linear Programming |
31 MAY 90 |
4 pages |
| Authors:
TENNESSEE UNIV KNOXVILLE
|
| Partial contents: DECOMP: an Implementation of Dantzig-Wolfe Decomposition for Linear Programming; Implementation of DECUBE, a linear programming decomposition code in Fortran on an Intel iPSC/2 Hypercube computer with 64 processors; The multistage, multiproduct material requirements planning problem with capacity constraints; The dynamic traffic assignment problem. |
|
| ESR Spectral Simulations of 4,4-Dimethyl-3-Oxazolydinyloxy Substituted Stearic Acid Spin Labels in Dry and Aqueous Dimyristoyl and Diphytanoyl Phosphatidylcholine |
08 MAY 90 |
15 pages |
| Authors:
Stephanie Masumura; M. D. Pace; NAVAL RESEARCH LAB WASHINGTON DC
|
| By using a FORTRAN program written for the Compaq 286 personal computer, ESR (electron spin resonance) spectra were simulated for the compounds dimyristoyl phosphatidylcholine (DMPC) and diphytanoyl phosphatidylcholine (DPhPC) containing 4,4-dimethyl-3-oxazolidinyloxy substituted stearic acid spin labels in both the dry phase and aqueous phase to determine the correlation times of these labels. The anisotropic motion of these labels indicates the order and fluidity of the DPhPC and DMPC bilayers. Keywords: ... |
|
| ROBFIT: A Code for the Analysis of Histogram Spectra with Nonlinear Regression and Robust Estimation |
04 MAY 90 |
297 pages |
| Authors:
R. L. Coldwell; G. J. Bamford; FLORIDA UNIV ALACHUA INST FOR ASTROPHYSICS AND PLANETARY EXPLORATION
|
| This book contains the information needed to use the spectral fitting code ROBFIT. It explains the physical and mathematical foundations of the algorithms used in the code and describes to apply the code to real spectra. ROBFIT is a computer automated spectrum analysis package which tries to extract the maximum information from a histogram of intensity versus channel number. A non-linear minimization routine which uses a generalization of the Newton- ... |
|
| Status of the Naval Ocean Systems Center's Long Wave Propagation Capability |
03 MAY 1990 |
11 pages |
| Authors:
Jerry A. Ferguson; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
|
|
| Computer-Aided Structural Engineering (CASE) Project: Investigation and Design of U-Frame Structures Using Program CUFRBC. Volume A. Program Criteria and Documentation |
MAY 90 |
139 pages |
| Authors:
Clifford O. Hays Jr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS INFORMATION TECHNOLOG Y LAB
|
| The interactive computer program CUFRBC can be used to investigate or design basins or channels for a variety of load conditions based on a two- dimensional frame analysis of a 1-ft slice of the U-frame. The soil loading on the walls may be obtained by empirical coefficients, active or passive wedge analyses with corrections for at-rest conditions, or inputing force-deformation curves for the walls. Hydraulic loads are automatically computed from ... |
|
| Optimization of a Power Transient Stability Program on a Vector Supercomputer, Theory and Applications |
18 APR 90 |
133 pages |
| Authors:
Gregg F. Degen; ARMY MILITARY PERSONNEL CENTER ALEXANDRIA VA
|
| Detailed simulations of large interconnected power distribution systems currently cannot be performed. Vector supercomputers have the capability to solve the great number of differential and non-linear simultaneous equations associated with the models, but programs have not been developed for them. This thesis investigates the optimization of a current power stability program installed on a Cray Y-MP vector supercomputer. Theory and models for power system stability are reviewed and an outline ... |
|
| Signal-Processing Techniques for Simulated Wideband Monopulse Radar Data |
APR 90 |
43 pages |
| Authors:
Ronald J. Wellman; Jerry L. Silvious; HARRY DIAMOND LABS ADELPHI MD
|
| A computer simulation is presented of the signals received by a coherent, frequency-agile, two coordinated monopulse radar from an array of point reflectors. A Fortran program for analyzing these simulated signals is used to obtain down-range and cross-range locations of the reflectors. Inverse Synthetic Aperture Radar (ISAR) techniques also are used to obtain a radar- cross-section-density image of a two-dimensional array to reflectors. The effects of system phase and amplitude ... |
|
| Computer Program for Mode Search in Partially-Filled Waveguide |
12 MAR 90 |
33 pages |
| Authors:
T. E. Van Deventer; P. B. Katehi; MICHIGAN UNIV ANN ARBOR RADIATION LAB
|
| The FORTRAN program PFW.FTN (Partially-Filled Waveguide) was written to compute the complex propagation constant of the hybrid modes propagating in an inhomogeneously-filled waveguide with any number of lossy substrates and non- perfectly conducting walls. Keywords: User friendly menu. (KR) |
|
| Crew Chief CAD System Interface Guide (Version 2 - SI) |
MAR 90 |
190 pages |
| Authors:
P. J. Krauskopf; J. W. Quinn; M. W. Jones; W. J. Stump; DAYTON UNIV OH RESEARCH INST
|
| This report describes the procedures to interface the CREW CHIEF programs with a user's computer aided design system through the Common Users Interface (CUI). The CUI was developed as the vehicle to pass information between the CREW CHIEF core programs and data bases and the user's CAD system. A set of interface subroutines pass input, output, and diagnostic parameters, in that order. Each passed variable is named according to FORTRAN ... |
|
| Fortran Program for Sound Scattering by Layered Isotropic Cylinder |
MAR 90 |
17 pages |
| Authors:
J. H. James; ADMIRALTY RESEARCH ESTABLISHMENT GOSPORT (UNITED KINGDOM)
|
| Skelton's original Fortran program for predicting time-harmonic sound radiation from an infinite cylinder comprising elastic, viscous and acoustic layers has point forces and monopoles as excitations. It has been extended to cover the case of excitation by a plane wave at arbitrary incidence, and the output may be used for transient radiation/scattering studies. Numerical examples are given, but a computer listing is not included. Keywords: Sound radiation, Sound scattering, Computer ... |
|
| Frequency Assignments for HFDF Receivers in a Search and Rescue Network |
MAR 90 |
|
| Authors:
Krista E. Johnson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This thesis applies a multiobjective linear programming approach to the problem of assigning frequencies to HFDF receivers in a search-and-rescue network in order to maximize the expected number of geolocations of vessels in distress. The problem is formulated as a multiobjective integer linear programming problem. The integrality of the solutions is guaranteed by the totally unimodularity of the A-matrix. Two approaches are taken to solve the multiobjective linear programming problem. ... |
|
| Comparison of Selection Procedures and Validation of Criterion Used in Selection of Significant Control Variates of a Simulation Model |
MAR 90 |
165 pages |
| Authors:
James A. Gigliotti; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The purpose of this thesis was three-fold. The first purpose was to revise and extend the capabilities of existing software for selecting the significant control variables of a simulation model, based on a newly developed selection criterion. The second purpose was to compare the results obtained using the revised software employing two different selection procedures. And the third purpose was then to validate the effectiveness of the new selection criterion ... |
|
| An Analysis of Four Error Detection and Correction Schemes for the Proposed Federal Standard 1024 (Land Mobile Radio) |
MAR 90 |
141 pages |
| Authors:
Carol A. Lohrmann; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Interoperability of commercial Land Mobile Radios (LMR) and the military's tactical LMR is highly desirable if the U.S. government is to respond effectively in a national emergency or in a joint military operation. This ability to talk securely and immediately across agency and military service boundaries is often overlooked. One way to ensure interoperability is to develop and promote federal communication standards (FS). This thesis surveys one ares of the ... |
|
| Optimization of a Compton Scatterer for Hard X-Ray Weapons Effects Simulation in an ICF Facility |
MAR 90 |
65 pages |
| Authors:
Russell L. Tinsley; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This thesis examined the optimization of a Compton scatterer for use in simulating hard X-ray effects in the proposed Laboratory Microfusion Facility (LMF). The LMF will produce inertial confinement fusion of deuterium-tritium pellets. The Compton scatterer is designed to reflect the X rays produced from the fusion toward a target. The scatterer should produce the maximum X-ray dose at the target while minimizing the neutron dose and gamma production. The ... |
|
| Rule Based Sinusoidal Encoding of Speech |
MAR 90 |
112 pages |
| Authors:
Luis M. Alenquer; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| A system was developed to investigate the data rate necessary to transmit speech using a rule based sinusoidal model. The system consists of a speech analyzer and a synthesizer. The analyzer outputs discrete frequencies and quantized amplitudes and phases of selected speech spectral components. The synthesizer reconstructs speech from these components based on a sinusoidal model. The selection of spectral components for voiced speech regions is based on the detection ... |
|
| Signal Processing Algorithms - Georgia Tech Benchmark |
27 FEB 1990 |
30 pages |
| Authors:
Andrew M. Henshaw; Steven R. Gieseking; Roy W. Melton; GEORGIA INST OF TECH ATLANTA
|
| This document describes a set of signal-processing algorithms, as implemented by the Computer Engineering Research Laboratory at Georgia Tech. The routines are presented as a representative collection of operations for processing Infrared Focal-Plane Array signals. For the purposes of testing and dissemination, each algorithm is presented as a stand-alone FORTRAN program. These programs are based upon a core harness routine which supports the input/output of a common data format (Georgia ... |
|
| Integrated Electromagnetic System Simulator (IESS) Post Run Analysis with DECALC/DECGRAPH and a Truth Data Formatting Program Written in Fortran |
08 FEB 90 |
|
| Authors:
Dana L. Howell; WRIGHT RESEARCH AND DEVELOPMENT CENTER WRIGHT-PATTERSON AFB OH
|
| The Analysis and Evaluation Group (WRDC/AAAI-4) has been tasked with integrating the Integrated Communication, Navigation, Identification Avionics (ICNIA) system into the Integrated Electromagnetic System Simulator (IESS) facility and performing Test and Evaluation (T&E) on the ICNIA system. This responsibility has led to the need to examine IESS post run analysis techniques to determine areas that may need enhancement. DECALC and DECGRAPH are Digital Equipment Corporation (DEC) software products that produce ... |
|
| FASTER: The Fault Tolerant Architecture Simulation Tool for Evaluating Reliability, Introduction and Applications |
FEB 90 |
123 pages |
| Authors:
P. Zemany; D. Goller; SANDERS ASSOCIATES INC NASHUA NH SOFTWARE SYSTEMS ENGINEERING
|
| FASTER (Fault Tolerant Architecture Simulation Tool for Evaluating Reliability) is a Monte Carlo Simulator which is used to evaluate reliability figures of merit for complex reconfigurable fault tolerant systems. The process used to specify a complex system is simplified with the use of constraint directed editors. The editors ease the interaction process which guides the user through system configuration and mission scenario input. Complete and well defined system specifications are ... |
|
| Development of a Postprocessing and 3D Graphical Imaging Facility |
31 JAN 90 |
6 pages |
| Authors:
James G. Brasseur; PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL ENGINEERING
|
| This grant supported the acquisition of equipment towards the development of what has been termed a Postprocessing and 3D Graphical Imaging Facility. The primary function of the facility is in the analysis of numerical and experimental data, perhaps created in other laboratories, through the combination of quantitative and graphical tools. Specifically, the motivation is the analysis of Full Numerical Simulations of turbulent flows to study time- dependent three-dimensional structural characteristics ... |
|
| Interactive Grid Generation on Small Computers |
31 JAN 90 |
48 pages |
| Authors:
Peter R. Eiseman; PROGRAM DEVELOPMENT CORP WHITE PLAINS NY
|
| At the start of Phase I, there were several 2D single block codes and a basic mathematical structure for such codes. During the Phase I research, the feasibility for general 2D multiblock code was firmly established. The mathematical structure of the control point form of algebraic grid generation (CCPF) was found to provide the essential theoretical framework for the codes and accordingly the necessary extensions of the CPF were of ... |
|
| Ada/Ed Compiler, Version 1.10 (UNIX) |
26 JAN 90 |
|
| Authors:
Steven P. Wilson; AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OH
|
| The NYU Ada/Ed Compiler is actually an Ada interpreter, written in the SETL programming language, that has been validated under the Ada Compiler Validation Capability (ACVC), Version, 1.10. It is useful for educational as opposed to commercial applications. The validation certificate for the compiler expires 1 December 1990..Software Description: The software is written in the SETL programming language for implementation on a DEC VAX(8650) computer using the VAX/VMS Version 5.2 ... |
|
| Microcomputer Missile Performance Software System: ASSIGNMENT Computer Software Component, ALM Maintenance Manual (MM-04) |
16 JAN 90 |
337 pages |
| Authors:
KAMAN SCIENCES CORP COLORADO SPRINGS CO
|
| The Microcomputer Missile Performance Software System (MPS) consists of ten integrated Computer Software Components (CSCs) that are used to assess ballistic missile performance, and to plan, generate, and evaluate timed laydowns of ballistic missile forces on target sets, subject to operational and nuclear vulnerability constraints. Within the MPS, ALM is the CSC responsible for assigning RVs to DGZs and for scheduling missile launches so as to minimize the span of ... |
|
| MERC2PLOT3D User's Manual |
JAN 90 |
7 pages |
| Authors:
W. Z. Strang; WRIGHT RESEARCH AND DEVELOPMENT CENTER WRIGHT-PATTERSON AFB OH
|
| The Euler and Navier-Stokes flow solvers of computational fluid dynamics generate so much output data that one needs interactive computer graphics to fully and quickly digest the results. Multi-block solutions can be even more difficult to interpret due to the patching required at the block abutments. Fortunately, NASA Ames developed an excellent graphics post-processor of CFD solutions, PLOT3D, meeting the requirements of multi-block solutions. Thus, all that is required to ... |
|
| Parallel Computer Graphics Algorithms for the Connection Machine |
JAN 90 |
26 pages |
| Authors:
John F. Richardson; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
|
| Many of the classes of computer graphics algorithms and polygon storage schemes can be adapted for parallel execution on various parallel architectures. The connection machine is one such architecture that should be thought of as a multiprocessor grid that can be reconfigured into standard 2- dimensional mesh and n-dimensional hypercube architectures. The classes of algorithms considered in this paper are SPLINES; POLYGON STORAGE; TRIANGULARIZATION; and SYMBOLIC INPUT. The target Connection ... |
|
| PRPSIM - A FORTRAN Code to Calculate Properties of Radio Wave Propagation in a Structured Ionized Medium. Volume 2. Theory and Models |
01 DEC 89 |
124 pages |
| Authors:
R. E. Dodson; D. J. Krueger; F. W. Guigliano; MISSION RESEARCH CORP SANTA BARBARA CA
|
| This report describes the PRPSIM (Properties of Radio Wave Propagation in a Structured Ionized Medium) code; a FORTRAN computer program for use in evaluating electromagnetic propagation effects resulting from detonation of nuclear weapons on satellite communications and radar systems. The code uses nuclear environment data files created by the SCENARIO high altitude, multiburst nuclear phenomenology code. PRPSIM calculates propagation effects due to enhanced mean ionization levels (e.g. absorption, noise, refraction, ... |
|
| An Evaluation of the Proposed MSRT Replenishment Model for Wholesale Consumable Items |
DEC 89 |
70 pages |
| Authors:
Richard E. Boike; Timothy H. Stringer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis compares the current wholesale level consumable replenishment inventory model, now in use at Navy Inventory Control Points (ICPs), with a proposed Mean Supply Response Time (MSRT) Model. The purpose of the MSRT model is to introduce a readiness measure into wholesale inventory management. The objective of the MSRT model is to determine inventory depths which minimize the mean supply response time subject to not exceeding the inventory dollar ... |
|
| An Iterative Solution to Aeroelastic Effects in Potential Flow |
DEC 89 |
101 pages |
| Authors:
Raymond C. Maple; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The purpose of the study was to develop a method of incorporating static aeroelastic effects into a vortex paneling aerodynamic solution. The study had two basic objectives: (1) Devise a solution technique; (2) Implement the technique and analyze several test cases. An iterative solution is developed which uses MSC/NASTRAN to perform structural analysis, and a three-dimensional vortex paneling method to perform aerodynamic analysis. The theory behind the method and details ... |
|
| Series Reversion/Inversion of Lambert's Time Function |
DEC 89 |
50 pages |
| Authors:
James D. Thorne; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The time of flight of a two-body orbit may be determined by integrating the radial velocity equation for a conic section. The resulting expression is sometimes called Lambert's Time Function, which depends on the gravitational constant, two position vectors, and the semi-major axis of the conic flight path. For mission planning purposes, it is often desirable to know the semi-major axis as a function of time, rather than the reverse. ... |
|
| Green's Functions for a Theoretical Model of an Aperture Fed Stacked- Patch Microstrip Antenna |
DEC 89 |
157 pages |
| Authors:
James B. Nazar; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| In this thesis a theoretical model for the analysis of an aperture fed stacked-patch microstrip antenna is presented. The mixed potential integral equation approach (MPIE) is used. The aperture is closed by using opposing magnetic currents on each side of the ground plane. The necessary Green's functions associated with the vector and scalar potentials are evaluated in the spatial domain using stratified media theory. The Green's functions are expressed as ... |
|
| Computer Graphics Adaptation of Several Aerodynamic Prediction Programs |
DEC 89 |
265 pages |
| Authors:
Craig M. MacAllister; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis describes the adaptation of six computer programs on the Micro VAX/2000/CAD/CAE workstation. Three of the programs, NEW DOUBLE, NEW PANEL, and NEW VOR, were originally transferred to the Aeronautical Engineering VAX System Server by LCDR John Campbell. Two of the programs (SUB and SUPER), both vortex lattice methods programs, were placed in the VAX system. The sixth program, a viscous interaction program was transferred/adapted to the VAX system ... |
|
| A Mesh Generator for Finite Element Structural Analysis in Two Dimensions |
DEC 89 |
41 pages |
| Authors:
Steven M. Buc; SYSTEM PLANNING CORP ARLINGTON VA
|
| Finite element structural analysis is gaining wide acceptance in the field of projectile design. In the past, computer memory and storage requirements have limited the application of finite element analysis to large main frame computers and workstations. Recently, great improvements have been made in the computing power of desk top personal computers. As a result, interest has developed in applying finite element software to the P.C. environment. The mathematics and ... |
|
| Near-Angle Scattering and Binary Optics |
DEC 89 |
126 pages |
| Authors:
Larry V. Chizek; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The research objective was to measure near-angle scattering (i.e., scattering less than one degree from the specular beam) from a binary optic and determine if a scalar scattering theory could adequately predict scattering performance. Near-angle scattering was measured from a binary optic beam splitter. A scalar scattering theory was developed and modeled using fortran on a personal computer; results from the computer simulation are compared to the actual measurements. The ... |
|
| Validation of the Boundary Element Method Applied to Complex Fracture Mechanics Conditions |
DEC 89 |
157 pages |
| Authors:
Ralph E. Urch; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This thesis presents analyses of several fracture mechanics problems via the Boundary Element Method. Specifically, an indirect procedure known as the Displacement Discontinuity Method was used to solve problems involving cracks in isotropic or specially orthotropic materials. Infinite as well as finite regions were considered. A series of configurations were analyzed and compared with either analytic solutions or results from a finite element model. Agreement for the infinite-domain problems was ... |
|
| Aeropredictive Methods for Missile Analysis |
DEC 89 |
85 pages |
| Authors:
Archibald S. Dunn; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Various computational methods and operational computer codes used to predict and evaluate aerodynamic coefficients and flight performance of missile bodies are reviewed. Aerodynamic effects of symmetric and asymmetric flow separation are discussed, as are the differences inherent in estimating the properties of the resulting flowfields. The semi-empirical aeroprediction codes NSWC and MISSILE DATCOM are compared against experimental data for a variety of configuration geometries and flight conditions; the MISSILE DATCOM ... |
|
| ACIRF User's Guide: Theory and Examples |
DEC 89 |
82 pages |
| Authors:
Roger A. Dana; MISSION RESEARCH CORP SANTA BARBARA CA
|
| Design and evaluation of radio frequency systems that must operate through ionospheric disturbances resulting from high altitude nuclear detonations requires an accurate channel model. This model must include the effects of high gain antennas that may be used to receive the signals. Such a model can then be used to construct realizations of the received signal for use in digital simulations of trans-ionospheric links or for use in hardware channel ... |
|
| Vectors and Matrices: Two Turbo Pascal Units for Fast Program Development |
NOV 89 |
38 pages |
| Authors:
Peter N. Roth; DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP STRUCTURES AND PROTECTION DEPT
|
| Vector and matrix methods in general, and the finite element method in particular, are now common engineering tools. Vectors are used to represent coordinates of points in 3-space, forces displacements, velocities, and so forth. Matrices are typically used to represent finite element stiffness or flexibility, damping, mass, coordinate transformation rules, etc. Any modern college mathematics book may be consulted for vector and matrix theory. This report documents a set of ... |
|
| SEADYN90 User's Manual. Revision |
NOV 89 |
190 pages |
| Authors:
R. L. Webster; P. A. Palo; NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
|
| This manual describes the input structure to the latest release of the capable dynamics computer model SEADYN. SEADYN is a general purpose, finite- element FORTRAN code that models the static and dynamic responses of arbitrarily-configured cable structures, including effects due to: environmental loads, surface/bottom (with friction) interaction, variable length lines, moved boundaries, and strumming. Program features include: free-field input format; interfaces for user-specified drag coefficients, current fields, and time- variation ... |
|
| Integration of the Sky Computers VORTEX/AT Array Processor Into the Workstation Communications Simulator |
NOV 89 |
117 pages |
| Authors:
Daniel R. Kupiak; ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
|
| The Workstation Communications simulator (WCS) is a personal computer based hardware/software system for the interactive digital simulation point-to- point digital communications systems. The baseline WCS is hosted on an IBM PC/AT microprocessor and is written entirely in FORTRAN-77. The enhanced WCS employs an additional optional single-board floating point array processor to perform the computationally intensive signal processing calculations. This report describes the initial implementation of the enhanced WCS utilizing a ... |
|
| Ground, Air, and Air Defense Force Concentration Model |
NOV 89 |
36 pages |
| Authors:
Jerome Bracken; ARMY CONCEPTS ANALYSIS AGENCY BETHESDA MD
|
| A model for concentrating initial and subsequent ground and air forces in main-thrust sectors is developed. Timing of subsequent ground force reinforcements is then modeled. Finally, air defenses are included. These factors significantly influence force concentration outcomes. A FORTRAN program and sample results are presented. |
|
| Massively-Parallel Computational Fluid Dynamics |
30 OCT 89 |
5 pages |
| Authors:
D. A. Calahan; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| Algorithm development. Implementation of a 3-D Navier Stokes implicit research code for AFFDL was initiated. This required the parallel solution of block-tridiagonal system and so was more challenging than the above explicit code. This is being continued in a new AFOSR grant. Connection Machine experiments. To keep abreast of SIMD architecture performance, a series of Fortran and C kerrels were studies on the Argonne Laboratory CM-2 during the summer of ... |
|
| Symbol Manipulation and Applied Mathematics |
15 OCT 89 |
11 pages |
| Authors:
Stanly Steinberg; NEW MEXICO UNIV ALBUQUERQUE
|
| An algorithm was developed to symbolically compute the infinitesimal Lie symmetries of a system of partial differential equations. A theory based on simple geometric intuition was developed for using variational problems to generate numerical grids. Symbolic algorithms were developed for transforming the variational problems to FORTRAN subroutines. A theory is being developed for differencing general elliptic problems in general coordinates (needed when general numerical grids are used). Symbolic algorithms are ... |
|
| Sound Effects Generator for Use with the Cockpit Research and Experimentation Work Load Simulator (CREWS) |
OCT 89 |
55 pages |
| Authors:
Michael W. Thompson; HUMAN ENGINEERING LAB ABERDEEN PROVING GROUND MD
|
| This manual describes the sound effects generator (SEG) developed for Digital Equipment Corp. UNIBUS computers. It provides the operational and programming information for using the SEG on DEC VAX UNIBUS computers. The SEG can produce a variety of complex sounds through two independent channels. Each channel is capable of producing noise and three tones with mechanisms provided for mixing the noise and tones, controlling the amplitude of each tone, and ... |
|
| Drydock Analysis System (DAS) User's Guide, Beta Version, Static Analysis of Drydock Structures |
SEP 89 |
37 pages |
| Authors:
Frank R. Johnson; T. E. Gillum; NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
|
| DAS (Drydock Analysis System) is a collection of FORTRAN programs used to statically analyze drydock structures constructed of reinforced concrete. Preprocessor programs allow graphic creation of a geometric model with its boundary and loading conditions. The SAP4 linear finite element analysis program is used to analyze the drydock structure based upon plane strain analysis theory. Postprocessing programs produce displaced shapes and graphic interpretations of stress results. The overall is activated ... |
|
| A PC-Based Imaging System for the Naval Postgraduate School Infrared Search and Target Designation (NPS-IRSTD) System |
SEP 89 |
148 pages |
| Authors:
Raymond C. Engel; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A system to display images from data generated by the Naval Postgraduate School Infrared Search and Target Designation (NPS-IRSTD) system (modified AN/SAR-8 ADM) was developed using an Intel 80386 CPU based desktop computer as the base platform. This computer was enhanced with a Metrabyte PDMA- 16 Input/Output board to facilitate data transfers and a Data Translation DT2861 framegrabber board for image processing. Images are displayed on a 512 by 480 ... |
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