| Methods for Creating Realistic Disk Images for Forensics Tool Testing and Education |
17-Mar-2009 |
35 pages |
| Authors:
Simson L Garfinkel; Loren E Peitso; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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 | Both testing of computer storage forensics tools, and education in conducting computer forensics require reference drive images with known characteristics. Without a known ground-truth it is not possible to fully verify the ability of a tool or a student's analytical technique on whether they capture the important data residing on the drive. Due to privacy concerns existing corpa of drive images from real users cannot be used, so we must ... |
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| Sensorless Electric Drive for Integral Horsepower Permanent Magnet Synchronous Motor 2001 |
OCT 2001 |
67 pages |
| Authors:
Todd D. Batzel; PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
|
| The permanent magnet synchronous motor (PMSM) is increasingly playing an important role in electric propulsion systems due to its many advantages over competing technologies. For successful implementation of the PMSM rotor position and speed information are required. A resolver or encoder attached to the shaft of the machine usually provides this information Many applications, however, cannot tolerate the use of the position sensor due to space and weight limitations, reliability ... |
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| Ionization and Pulse Lethargy Effects in Inverse Cherenkov Accelerators |
28 FEB 97 |
45 pages |
| Authors:
P. Sprangle; R. F. Hubbard; B. Hafizi; NAVAL RESEARCH LAB WASHINGTON DC BEAM PHYSICS BRANCH
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| Ionization processes limit the accelerating gradient and place an upper limit on the pulse duration of the electromagnetic driver in the Inverse Cherenkov Accelerator (ICA). Group velocity slippage, i.e., pulse lethargy, on the other hand, imposes a lower limit on the pulse duration. These limits are obtained for two ICA configurations in which the electromagnetic driver (e.g., laser or millimeter wave source) is propagated in a waveguide that is, (i) ... |
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| Advanced Submarine Technology - Project M Control Theory Report. Phase 1 |
SEP 93 |
65 pages |
| Authors:
M. A. Swinbanks; S. Daley; GEC-MARCONI RESEARCH CENTRE CHELMSFORD (UNITED KINGDOM)
|
| This interim report presents the broad band control theory aspects of a programme whose objective is to control the dynamics of a large, lightweight marine machinery raft supported on an array of electromagnetic actuators. The report shows how it is possible to achieve, simultaneously, the normally conflicting requirements of accurate alignment of the raft under sea-way or manoeuvring motions, of the elimination of mount resonances, of stiffening long wavelength bending ... |
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| Plasma Analysis of a Small-Bore, Arc-Armature Railgun |
NOV 90 |
37 pages |
| Authors:
Alexander E. Zielinski; John D. Powell; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Diagnostic measurements of plasma-armature properties have been made on a 9.3-mm square-bore, arc-driven railgun. The measurements include the total current carried by the arc, the voltages across the breech and muzzle ends of the gun tube, light output from the arc seen at points along the gun tube, and finally the time rate of change of the induction field associated with the armature current. From these data it is possible ... |
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| A Technical Assessment of Electromagnetic Propulsion for Small Caliber Weapons Applications |
NOV 90 |
88 pages |
| Authors:
Keith A. Jamison; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| An assessment of the future potential of electromagnetic propulsion for small caliber weapons has been performed to consider possible benefits, systems configurations, research and development needs, and mission requirements. The assessment consists of a panel evaluation of an existing electromagnetic launcher EML program and comparisons of envisioned point designs for small caliber weapons systems. The general conclusions are that the present research effort is well-founded and that EM propulsion has ... |
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| Plasma Properties of a Large-Bore, Arc-Armature Railgun |
JUL 89 |
66 pages |
| Authors:
Keith A. Jamison; Henry S. Burden; John D. Powell; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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| Diagnostic measurements on the plasma armature of the large-bore railgun, CHECMATE, have been made for four separate firings. These measurements include time-dependent values of the current, light output, and breech and muzzle voltages. In addition, signals obtained from B-dot data are used to infer the armature induction field, current-density profile, and arc length. The measured results are then employed in conjunction with a one-dimensional, steady-state model to calculate properties of ... |
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| Analysis of an Inverse Railgun with a Railgun Load |
JUL 88 |
45 pages |
| Authors:
John D. Powell; Keith A. Jamison; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A model is presented to analyze theoretically an inverse railgun used as a power supply for a railgun. The governing equations are developed and it is shown that they possess an exact analytic solution in the limit that resistive effects can be neglected. These limiting-case solutions are used to study qualitatively the behavior of the inverse railgun in this configuration. More general numerical solutions, which account approximately for resistive effects, ... |
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| Contractors Meeting on Combustion Rocket Propulsion Diagnostics of Reacting Flow Held in Monrovia, California on 13-17 June 1988 |
13 JUN 88 |
349 pages |
| Authors:
J. M. Tishkoff; M. A. Birkan; G. S. Roy; S. G. Lekoudis; CALIFORNIA INST OF TECH PASADENA DIV OF ENGINEERING AND APPLIED SCIENCE
|
| Abstracts are given for research efforts on airbreathing combustion, rocket propulsion, and diagnostics of reacting flows. Keywords: Shear layers, Turbulence, Instability, Electromagnetic propulsion, Plasma propulsion, Erosion, Magnetoplasmadynamic thrusters, Fluid dynamics, Arcjet thrust chambers, Electrothermal propulsion, Laser thermal propulsion, Electric discharges, Chemical kinetics, Nitramines, Nitroform compounds, Solid propellants, Acoustic flow fields, Solid rocket combustion chambers, Acoustic waves. (aw) |
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| Proceedings of the U.S. Army Symposium on Gun Dynamics (5th) Held in Rensselaerville, New York on 23-25 September 1987 |
SEP 87 |
381 pages |
| Authors:
Thomas E. Simkins; Clarke G. Homan; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY CLOS E COMBAT ARMAMENTS CENTER
|
| This represents a compilation of technical papers concerning analyses, design, measurement, and automation of gun dynamics. The authors represent a cross- section of the scientific and technical community, including universities, industrial, and Government research laboratories. The Symposium was divided into five sessions: (I) Analytical dynamics, (II) Data Analysis - Correlation, (III) Computer Codes and Models, (IV) Experiments and Metrology, and (V) Electromagnetic propulsion/Stochastic Modeling. The Proceedings follow the same format. ... |
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| Analytical Solution of the Equations for a Coaxial Plasma Gun Operating in the Snowplow Mode. 1. Weak Coupling Limit |
JUN 87 |
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| Authors:
David Dietz; AIR FORCE WEAPONS LAB KIRTLAND AFB NM
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 | The analysis solution of the system of coupled ordinary differential equations which describes the time evolution of an ideal coaxial plasma gun operating in the snowplow mode is obtained in the weak coupling limit, i.e., when the gun is fully influenced by the driving (RLC) circuit but the circuit is negligibly influenced by the gun. Criteria are derived for the validity of this limit and numerical examples are presented. ... |
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| Initial Acceleration for Electromagnetic Launchers: A Feasibility Study on Chemical Propellants |
NOV 1983 |
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| Authors:
M. J. Chung; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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| Stored electromagnetic energy has been used at MRL and elsewhere to accelerate projectiles to ultra-high velocities. This novel method of accelerate suffers from the disadvantage that large currents could damage the conducting rails or the projectile particularly when the latter is at rest or moving slowly. This report discusses the feasibility of using conventional gun propellants to accelerate projectiles to velocities of about 1000 m/s before the pulse of electromagnetic ... |
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| 'All-Electric' Accessory Drive Systems: Implications on Engine Design and Performance, |
SEP 1983 |
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| Authors:
G. B. Toyne; G. S. Hodges; ROLLS-ROYCE LTD BRISTOL (ENGLAND)
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| Engine studies had been conducted on 'all-electric' accessory power systems in response to questions from aircraft manufacturers, particularly in the civil field. It was felt appropriate to extend the studies to military applications, and to clarify the effects on engine design and performance. In the 'all-electric' proposal, all accessory power requirements are generated and distributed electrically. A major feature is that air bleeds for environmental control systems are replaced by ... |
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| Optical Beam Steering System. |
12 JUN 1979 |
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| Authors:
Kirk E. Davies; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An optical beam steering system is provided by a reflective surface mounted on a baseplate which is electromagnetically driven by applied signals to control its angular disposition to a degree of accuracy within fractions of a microradian. Resilient means such as coil springs are attached in pairs to the baseplate to define two orthogonally related axes of movement intersecting at the geometric center of the baseplate. A pivotal support (preferably ... |
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| A Feasibility Study of an Alternative Power and Control System for a High Precision Gyro. |
DEC 1978 |
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| Authors:
Marc Normand Richard; ARMY MILITARY PERSONNEL CENTER ALEXANDRIA VA
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| A new gyro wheel drive system composed of an induction motor on the same shaft as, and in electrical series with, a permanent magnet motor has been designed, analyzed, implemented, and tested. Its open loop operating characteristics have been determined for both a voltage source and current source power stage. The system is too unreliable in the open loop mode for high precision gyro applications. A closed loop control scheme ... |
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| Hybrid Power Source for Vehicular Propulsion, |
JUN 1978 |
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| Authors:
Edward J. Dowgiallo; ARMY MOBILITY EQUIPMENT RESEARCH AND DEVELOPMENT COMMAND FORT BELVOIR VA
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| Feasibility Study for the Use of an Electromagnetic Rail Gun in the Launching and Sustaining of Reentry Models. |
APR 1976 |
83 pages |
| Authors:
John P. Barber; ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AIR FORCE STATION TENN
|
| The requirements of a realistic reentry test facility for aerothermodynamic tests are reviewed. Basically, this requires the test article to be accelerated to a high velocity and then exposed to the test environment for a sufficient length of time. One method which might be considered to accelerate the test model to the required velocity is an electromagnetic launcher. Equations are developed to describe the performance of several variations of an ... |
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| Advanced Propulsion Concepts - Project Outgrowth. |
JUN 1972 |
271 pages |
| Authors:
Franklin B. Mead Jr; AIR FORCE ROCKET PROPULSION LAB EDWARDS AFB CALIF
|
| A study was conducted by an ad hoc group within the Air Force Rocket Propulsion Laboratory during the calendar year of 1970 in an attempt to predict the major propulsion developments that may occur in the next 30 to 40 years. The report evaluates the future of conventional chemical rocketry based on thermodynamic principles and revolutionary conceptual approaches to system applications. Advanced concepts falling under the general headings of Thermal, ... |
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| Naval Ship Control Systems. |
SEP 1970 |
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| Authors:
Luis Carlos Jaramillo Pena; NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
|
| An analysis of the problem of Naval Ship Automation is made. The purpose is to search the nonclassified existing documents and to present a general view of the state of the art in Naval Ship Systems. This study covers material that is concerned with conventional Naval Surface Ships, such as destroyers and frigates. Fire Control Systems are not considered because such studies already exist at the present time. (Author) |
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| INVESTIGATION OF MINIATURE G-HARDENED ELECTROMECHANICAL CLOCKS - A DIFFERENTIAL-MOTION CLOCK, |
MAY 1969 |
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| Authors:
James Meek; HARRY DIAMOND LABS WASHINGTON D C
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| Electromechanical clocks for use in high-spin acceleration environments are explored. Criteria of design to insure instrument survival and functioning in the environment are stated. Problems caused by high acceleration such as increased power consumption, frictional losses, inertial coupling due to spin, unbalanced torque loading, and mechanical stresses and deflections are discussed. The concept of micronization as a solution to many of these problems is advanced. Novel design concepts for clock ... |
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| MICRO-STEP MOTOR. |
MAY 1969 |
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| Authors:
G. C. Joyce; G. C. Wilson; ROYAL RADAR ESTABLISHMENT MALVERN (UNITED KINGDOM)
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| A simple reversible linear motor which steps along a precision track is described. Step size can be varied within the range 0.1 - 5.0 um and final motor position can be adjusted to 0.01 um. More complex versions of the motor and control circuits are also described. The motor uses a piezo-electric tube as the driving element which operates in conjunction with electromagnetic clamps to generate progressive movement. (Author) |
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| TRANSACTIONS OF THE SECOND TECHNICAL WORKSHOP ON DYNAMIC STABILITY TESTING, HELD AT THE ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AIR FORCE STATION, TENNESSEE ON APRIL 20-22, 1965. VOLUME II. |
1965 |
1 pages |
| Authors:
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN
|
| Contents: Facilities, Techniques and Test Results; Dynamic Stability Testing in the 1,000-ft Hypervelocity Range at the Arnold Engineering Development Center; Problems Associated with Obtaining Accurate Dynamic Stability Results from Free-Flight Tests; Free Flight Wing Tunnel Techniques at the Ballistic Research Laboratories; Dynamic stability Testing with Magnetic Balance Systems; Instrumentation and Techniques Used at the Naval Ordnance Laboratory for the Determination of Dynamic Derivatives in the Wind Tunnel; Influence of Boundary ... |
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| TAPE-DRIVE ASSEMBLY FOR MAGNETIC TAPES IN THE M-2 COMPUTER, |
30 OCT 1964 |
|
| Authors:
V. D. KNYAZEV; V. N. Sakharov; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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| The tape-drive assembly is designed for sliding the magnetic tape under read-record heads in accordance with instructions, arriving from control block of memory unit. In the tape-drive assembly there is realized also direct recording of information on tape and reading of information. |
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| The Use of High Rotational Speed Techniques as a Laboratory Method for the Study of Mechanical Properties of Metals at Elevated Temperatures. |
MAY 1962 |
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| Authors:
A. R. Kuhlthau; VIRGINIA UNIV CHARLOTTESVILLE RESEARCH LABS FOR THE ENGINEERING SCIENCES
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| ELECTROMAGNETIC PROJECTOR STUDY |
JUL 1961 |
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| Authors:
J.L. RADNIK; B.F. LATHAN; IIT RESEARCH INST CHICAGO ILL
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| The performance characteristic of the parallelrail, the repulsion coil, and the induction motor electromagnetic projectors were stdied to determine the feasibility of the electromagnetic projector as an aerospace vehicle weapon and a hypervelocity laboratory instrument. The investigation consisted of a survey of previous investigations, a study of the basic elecromechanical relationships, the determination of utimate projector capabilties, and a brief study of supplemental applications. It was concluded that the only ... |
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| A STUDY OF THE DEFLECTION OF THE VERTICAL AT THE U. S. NAVAL ORDNANCE TEST STATION |
02 MAR 1961 |
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| Authors:
William F. McIntosh; SHELDON T. RIO; NAVAL ORDNANCE TEST STATION CHINA LAKE CALIF
|
| The problem of deflection of the vertical is presented and ways it is often solved are summarized. The gravimetric method is outlined and the details of its actual use are listed. The results of the preliminary gravimetric calculations made for 1 Midas location and 8 FLR stations are given. The proposed project to complete the deflection calculations gravimetrically and to determine the deflection at any other station in the Indian ... |
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| SYMPOSIUM ON SUPERCONDUCTIVE TECHNIQUES FOR COMPUTING SYSTEMS, WASHINGTON, D.C., MAY 17, 18, 19, 1960 |
30 SEP 1960 |
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| Authors:
OFFICE OF NAVAL RESEARCH ARLINGTON VA
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Reports by Keyword(s)
ELECTROMAGNETIC DRIVES
