| Analysis and Testing of a Tapered End Connection for Laser Welded Steel Sandwich Panels |
15-Aug-2009 |
181 pages |
| Authors:
Vincent Caccese; Serdar Yourimaz; Lawrence Thompson; Senthil S Vei; MAINE UNIV ORONO OFFICE OF RESEARCH AND SPONSORED PROGRAMS
|
 | 14. ABSTRACT This report summarize the analysis and cyclic testing of a laser welded steel sandwich panel end connection. Also included are monotonic tests of stake welded lap shear coupons with welds oriented both longitudinally and transverse. Steel sandwich panels offer substantial resistance to static and dynamic loads due to their high stiffness and substantial energy absorbing capacity. Panels of this kind are interest of potential use in ships and ... |
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| Recommendations on Composite Socket Fabrication Based Upon Experimental Results |
20-Jun-2009 |
93 pages |
| Authors:
Christpher W Norfolk; Jon Osborn; SOUTH CAROLINA RESEARCH AUTHORITY (SCRA) ANDERSON SC
|
| The objective was to gather quantitative data on the materials commonly used to manufacture definitive composite sockets. The purpose was to make informed recommendations to guide socket fabrication. Materials were fabricated into both flat panels and sockets. Flat panels were tested according to ASTM test protocols. Sockets were tested according to the static testing described by the ISO standard for lower limb prostheses. |
|
| Methodology for Dynamic Characterization of Fragmenting Warheads |
May-2009 |
20 pages |
| Authors:
Jason Angel; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Fragmentation is characterized by a static arena test. In this test, fragmentation data are assembled in a Z-data file, which serves as input to lethality models and includes the velocity and angle of inclination of the warhead to estimate the lethal area of fragmentation. In this report, a new method to confirm the Z-data file and the lethality methodology is proposed. As a test case, the 105-mm high-explosive plastic round ... |
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| Evaluation of Blast Resistant Rigid Walled Expeditionary Structures (PREPRINT) |
31-Mar-2009 |
|
| Authors:
Christopher L Genelin; Robert J Dinan; John M Hoeman; Hani A Salim; AIR FORCE RESEARCH LAB TYNDALL AIR FORCE BASE FL AIRBASE TECHNOLOGIES DIV
|
 | Blast and fragmentation resistance of expeditionary shelters has become of great interest given the current threat environment. One such structure now being considered for deployment utilizes an ISO container sized steel frame with infill panels. The panels consist of a lightweight extruded polystyrene core sandwiched between two galvanized, light-gauge steel sheets. An investigation was conducted into the blast and fragmentation resistance of this new type of shelter and a direct ... |
|
| Checking Framework Interactions with Relationships |
Dec-2008 |
111 pages |
| Authors:
Jonathan Aldrich; Ciera Jaspan; CARNEGIE-MELLON UNIV PITTSBURGH PA INST OF SOFTWARE RESEARCH INTERNAT
|
| Software frameworks impose constraints on how plugins may interact with them. Many of hese constraints involve multiple objects, are temporal, and depend on runtime values. Additionally, they are difficult to specify because they are non-local and may break behavioral subtyping. This work presents relationships as a means for specifying framework constraints, and it presents a formal description and implementation of a static analysis to find constraint violations in plugin code. ... |
|
| Performance of the Tin-Free Antifouling Coating International Ecoloflex in DSTO/RAN Trials |
Oct-2008 |
33 pages |
| Authors:
John A Lewis; DEFENSE SCIENCE AND TECHNOLOGY ORGANIZATION VICTORIA (AUSTRALIA) MARITIME PLATFORMS DIV
|
| A national and global ban on the application of antifouling paints containing tributyltin (TBT) is being introduced because of the detrimental effects of TBT on non-target marine species. DSTO, supported by the Royal Australian Navy (RAN), undertook a comprehensive program in an attempt to find alternative products that would match or approach the antifouling performance and effective life of TBT-based systems. The evaluation program included static immersion trials, dynamic flow ... |
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| A Static Aeroelastic Analysis of a Flexible Wing Mini Unmanned Aerial Vehicle |
27 MAR 2008 |
111 pages |
| Authors:
Nathan A. Pitcher; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
|
| The static aeroelastic behavior of the Nighthawk mini unmanned aerial vehicle is examined using a combined experimental and computational approach. Three wings are examined. In order of increasing stiffness they are: a flexible wing, a stiff wing, and a fictitious rigid wing with zero deflection. Photogrammetry is used during wind tunnel testing to measure the average deflected shape of the flexible and stiff wings during flight. The independent variables during ... |
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| Static Extraction of Object-Oriented Runtime Architectures |
Mar-2008 |
55 pages |
| Authors:
Jonathan Aldrich; Marwan Abi-Antoun; CARNEGIE-MELLON UNIV PITTSBURGH PA SCHOOL OF COMPUTER SCIENCE
|
| For many object-oriented systems, it is useful to have a runtime architecture, that shows networks of objects. But it is hard to statically extract runtime object graphs that provide architectural abstraction from an arbitrary program written in a general purpose language that follows common design idioms. Previous approaches extract low-level non-hierarchical object graphs that do not provide architectural abstraction, change the language too radically for many existing implementations, or use ... |
|
| PC104 Control Environment Development and Use for Testing the Dynamic Accuracy of the MicroStrain 3DM-GX1 Sensor |
JUN 2007 |
133 pages |
| Authors:
Jonathan Shaver; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| There is a need for a standard, accurate test bench for inertia-based orientation sensors. Static accuracy testing of these sensors is straightforward but dynamic accuracy testing is more difficult. A test bench system is developed with encoders and a PC104 computer under the QNX Neutrino real-time operating system. A MicroStrain 3DMGX1 inertial sensor was used as the sensor to be tested. The dynamic error of this sensor was accurately recorded ... |
|
| F-16B Pacer Aircraft Trailing Cone Length Extension Tube Investigative Study (HAVE CLETIS) |
JUN 2007 |
91 pages |
| Authors:
Michael E. Welser; Darin L. Hoenle; Swami B. Iyer; Yeu-Fong Chua; Carrie A. Reinhardt; Andrew J. Jutte; AIR FORCE TEST PILOT SCHOOL EDWARDS AFB CA
|
| This USAF Test Pilot School Test Management Project report presents the results of an investigation of trailing cone flying qualities and calibration of an F-16B pacer aircraft equipped with fixed-length trailing cone systems of different lengths. |
|
| Final Programmatic Environmental Impact Statement for Defense Threat Reduction Agency (DTRA) Activities on White Sands Missile Range, New Mexico. Volume 1 |
MAR 2007 |
785 pages |
| Authors:
DEFENSE THREAT REDUCTION AGENCY FORT BELVOIR VA
|
| This Final Programmatic Environmental Impact Statement (PEIS) comprehensively addresses proposed Defense Threat Reduction Agency (DTRA) activities at White Sands Missile Range (WSMR), New Mexico. It addresses future DTRA testing activities and expands on the current testing parameters addressed in existing National Environmental Policy Act (NEPA) documents. It includes a review of current operations and would serve as an environmental reference for future planning and development of various programs. The proposed ... |
|
| Next Generation Systems Languages |
01 DEC 2006 |
14 pages |
| Authors:
Greg Morrisett; HARVARD UNIV CAMBRIDGE MA
|
| The goal of this work is to explore techniques for making today's software, which is largely written in type-unsafe, low-level languages such as C, as reliable and trustworthy as code written in type-safe, high-level languages such as Java or ML. Type-safe languages automatically block or prevent common vulnerabilities such as buffer overruns, format string attacks, and overflow attacks which are all too common in today's critical software infrastructure. To this ... |
|
| Validating Network Security Policies via Static Analysis of Router ACL Configuration |
DEC 2006 |
169 pages |
| Authors:
Eric G. W. Wong; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The security of a network depends on how its design fulfils the organization's security policy. One aspect of security is reachability: whether two hosts can communicate. Network designers and operators face a very difficult problem in verifying the reachability of a network, because of the lack of automated tools, and calculations by hand are impractical because of the often sheer size of networks. The reachability of a network is influenced ... |
|
| Mitigation of Critical Single Point Failure (SPF) Material - Laminac 4116 Binder Replacement Program for Parachute and Cluster Stars Illuminant Compositions for Hand Held Signals |
01 NOV 2006 |
8 pages |
| Authors:
G. R. Lakshminarayanan; Gary Chen; Richard Ames; Wai T. Lee; James L. Wejsa; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ
|
| Laminac 4116 binder has been identified as a single point failure (SPF) material since it is being produced by only one company and there is a possibility that the company may discontinue production due to low product demand. In addition, other issues involved with the use of Laminac include limited shelf life, environmental and health hazardous concerns. An investigation was conducted to develop alternate and environmentally compatible binder materials to ... |
|
| Experimental Investigation of the Aerodynamic Ground Effect of a Tailless Lambda-Shaped UCAV with Wing Flaps |
JUN 2006 |
209 pages |
| Authors:
Jason T. Mostaccio; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This experimental study adequately identified the ground effect region of a lambda-shaped unmanned combat air vehicle (UCAV). The lambda planform used in this study was originally tested in a previous experiment to determine the stability and control characteristics generated out-of-ground-effect. The following study extends the existing database by analyzing the inherent aerodynamic behavior that is produced by employing trailing edge flap deflections while flying in-ground-effect (IGE). To accomplish this objective, ... |
|
| Determining In-Flight Tracker Accuracy |
MAR 2006 |
8 pages |
| Authors:
Corbin G. Koepke; Vincent Parisi; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| Evaluating a system in flight poses challenges that are not found in a laboratory environment. This paper discusses some of the issues involved in conducting an in-flight test to evaluate tracker accuracy, such as head movement, synchronization of time, changing coordinate systems, and interpolating data. The paper describes six types of accuracy: laboratory static, laboratory dynamic, installed static, installed dynamic, operational static, and operational dynamic. In general, as the realism ... |
|
| Reactive Processing and Co-Extrusion of Ultra-High Temperature Ceramics and Composites |
28 FEB 2006 |
34 pages |
| Authors:
William G. Fahrenholtz; Gregory E. Himas; Adam L. Chamberlain; James W. Zimmerman; MISSOURI UNIV-ROLLA DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The processing, properties, and performance of zirconium diboride-ceramics were studied. The initial phase of the work focused on improving the properties of zirconium diboride silicon carbide ceramics prepared from commercial powders by minimizing the-impurity content and controlling the grain size of ceramics prepared by conventional hot pressing. Strengths of more than 1000 MPa (1 GPa) were measured for zirconium diboride containing 20 or-30 volume percent silicon carbide, much higher than ... |
|
| Performance of Polymer-Encased Concrete Walls Subjected to Blast Loads |
25 JAN 2006 |
12 pages |
| Authors:
James S. Davidson; Jeff W. Fisher; Robert J. Dinan; ALABAMA UNIV IN BIRMINGHAM
|
| This paper discusses recent testing and finite element simulation of stay-in-place polymer concrete forms. Static tests provided a definition of resistance mechanisms. Dynamic tests demonstrated improved blast resistance effectiveness over other standard concrete wall forms. The finite element simulations provide a high level of understanding of resistance mechanisms, fracture propagation, influence of support conditions, etc., over the duration of the flexural response. The knowledge gained from the testing and simulation ... |
|
| Passive Ranging Using Atmospheric Oxygen Absorption Spectra |
JAN 2006 |
135 pages |
| Authors:
Michael R. Hawks; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The depth of absorption bands in observed spectra of distant, bright sources can be used to estimate range to the source. A novel approach is presented and demonstrated using observations of the oxygen absorption band near 762 nm. Range is estimated by comparing observed values of band-average absorption against curves derived from either historical data or model predictions. Curves are based on fitting a random band model to the data, ... |
|
| Formalizing Sensitivity in Static Analysis for Intrusion Detection |
2006 |
16 pages |
| Authors:
Henry H. Feng; Jonathon T. Giffin; Yong Huang; Somesh Jha; Wenke Lee; Barton P. Miller; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A key function of a host-based intrusion detection system is to monitor program execution. Models constructed using static analysis have the highly desirable feature that they do not produce false alarms; however, they may still miss attacks. Prior work has shown a trade-off between efficiency and precision. In particular, the more accurate models based upon pushdown automata (PDA) are very inefficient to operate due to non-determinism in stack activity. In ... |
|
| Experimental Investigation of a Lift Augmented Ground Effect Platform |
SEP 2005 |
108 pages |
| Authors:
Roberto T. Igue; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This experimental study investigated the feasibility of applying the concept of a skirtless hovercraft into the production of an operational vehicle. A 0.255 m diameter prototype was designed, built and tested. An air bearing table was used as a testing platform, virtually eliminating the influence of friction and providing one degree of freedom for the experiments. Static tests were performed at various heights and craft configurations, providing a wide range ... |
|
| Analysis of Aerosol Aging in the Rotating Drum Chamber |
AUG 2005 |
76 pages |
| Authors:
Janon F. Embury; Tiffany A. Sutton; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
| Two of the most recent theories describing aero-sol mechanics in the rotating drum chamber were compared with experimental measurements. Both theories predicted nearly the same results but did not match out measurements. Possible causes for the discrepancies were investigated, and it was found that convective diffusion accounts for the difference with the stirred settling model predicting measurements reasonably in the limit where rotation rate becomes zero. Once rotation begins, transport ... |
|
| Evaluating Static Analysis Tools for Detecting Buffer Overflows in C Code |
May-2005 |
|
| Authors:
Kendra J Kratkiewicz; HARVARD UNIV CAMBRIDGE MA
|
| This project evaluated five static analysis tools using a diagnostic test suite to determine their strengths and weaknesses in detecting a variety of buffer overflow flaws in C code. Detection, false alarm, and confusion rates were measured, along with execution time. PolySpace demonstrated a superior detection rate on the basic test suite, missing only one out of a possible 291 detections. It may benefit from improving its treatment of signal ... |
|
| On Static Reachability Analysis of IP Networks |
01-Mar-2005 |
15 pages |
| Authors:
Jennifer Rexford; Hui Zhang; Geoffrey G Xie; Jibin Zahn; David A Maltz; Albert Greenberg; Gisli Hjalmtysson; CARNEGIE-MELLON UNIV PITTSBURGH PA
|
| The primary purpose of a network is to provide reachability between applications running on end hosts. In this paper, we describe how to compute the reachability a network provides from a snapshot of the configuration state from each of the routers. Our primary contribution is the precise definition of the potential reachability of a network and a substantial simplification of the problem through a unified modeling of packet filters and ... |
|
| EELV Secondary Payload Adapter (ESPA) Static Qualification Tests |
AUG 2004 |
26 pages |
| Authors:
Gregory E. Sanford; Jeffry S. Welsh; CSA ENGINEERING INC ALBUQUERQUE NM
|
| The United States Air Force Research Lab is currently examining options to launch small satellites ( |
|
| Simulation of Ductile Failure in Metals Under Dynamic Loading Conditions Using Advanced Material Damage Modeling |
JUL 2004 |
218 pages |
| Authors:
Nicola Bonora; Pietro P. Milella; CASSINO UNIV (ITALY) DIPARTIMENTO DI MECCANICA STRUTTURE AMBIENTE E TERRITORIO
|
| This report results from a contract tasking University of Cassino as follows: The contractor shall investigate the issue of advanced failure prediction and design by means of innovative material failure modeling and computational techniques. The specific tasks include: - the use and implementation of advanced material modeling incorporating damage. strain rate and temperature effects. in an extensive number of numerical simulations; - verification of the model effective predictive capabilities in ... |
|
| Programmable Interfaces for Advanced Static Analysis |
10 JUN 2004 |
7 pages |
| Authors:
Tim Teitelbaum; GRAMMATECH INC ITHACA NY
|
| Tools that analyze software are exorbitant to develop, yet different analysis applications have quite similar infrastructure requirements. An effective cost-reduction approach is to amortize the development costs of a common infrastructure across multiple subject programming languages, computer platforms, and analysis applications. This is the final report of a one-year project aimed at creating such a common program-analysis infrastructure. |
|
| Static Security Analysis for Open Source Software |
APR 2004 |
15 pages |
| Authors:
John Viega; SECURE SOFTWARE SOLUTIONS FAIRFAX VA
|
| The goal of the project, Static Security Analysis for Open Source Software", was to explore technologies to improve the security of software by helping to automate security analysis. The project successfully improved upon the best published analysis techniques and made several releases publicly available as open source software. The analysis techniques developed under this effort reduce both false positives and false negatives compared to previous techniques. Additionally, the tools developed ... |
|
| Flow-Structural Interaction in Solid Rocket Motors |
JAN 2004 |
|
| Authors:
John W. Murdock; William A. Johnston; AEROSPACE CORP LOS ANGELES CA
|
| This paper reviews and summarizes recent work on flow-structural interaction in solid rocket motors. This interaction between bore flow and propellant grain is important because it can lead to rocket motor failure. In the first part of the paper, an idealized model of the failure mechanism is developed to illustrate in simple terms how such an event can occur. In the second part of the paper, recently published numerical modeling ... |
|
| Analytical Support in Aircraft Certification |
27 AUG 2003 |
10 pages |
| Authors:
Jakub Kaczkowski; Wojciech Potkanski; INSTITUTE OF AVIATION WARSAW (POLAND)
|
| The high cost of designing a new airplane enforced engineers to look for new cheaper methods. One method for the cost reduction is wide use of computer simulations in designing and certification process. From many different methods of analysis, FEM appears to be the best, but in spite of all improvements, present level of fidelity is still too low to completely eliminate experiments in the designing process. This explains why ... |
|
| Comparison of X-31 Flight and Ground-Based Yawing Moment Asymmetries at High Angles of Attack |
MAR 2003 |
15 pages |
| Authors:
Brent R. Cobleigh; Mark A. Croom; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION EDWARDS AFB CA DRYDEN FLIGHT RESEARCH CENTER
|
| Significant yawing moment asymmetries were encountered during the high angle-of-attack envelope expansion of two X-31 aircraft. These asymmetries caused position saturations of the thrust-vectoring vanes and trailing-edge flaps during some stability-axis rolling maneuvers at high angles of attack. The two test aircraft had different asymmetry characteristics, and ship 2 has asymmetries that vary as a function of Reynolds number. Several aerodynamic modifications have been made to the X-31 forebody with ... |
|
| A Quasi-Steady Evaluation of Submarine Rising Stability: The Stability Limit |
MAR 2003 |
|
| Authors:
George D. Watt; Jan Hooft; DEFENCE RESEARCH ESTABLISHMENT ATLANTICDARTMOUTH (NOVA SCOTIA)
|
| When submarines blow ballast to the surface from deep depths in an emergency, they can experience roll instability if they ascend with a large flow incidence angle. It is shown that an instability is caused by the destabilizing hydrodynamic rolling moment on the sail (which points upwards into the onset crossflow) overcoming the static righting moment (the center of gravity is below the center of buoyancy) as the boat is ... |
|
| Advanced Iso-Grid Fairing Qualification Test for Minotaur Launch Vehicle |
2003 |
11 pages |
| Authors:
Greg Sanford; John E. Higgins; Jeffry Welsh; AIR FORCE RESEARCH LAB KIRTLAND AFB NM
|
| The development of the grid-stiffened fairing to be flown on the Minotaur launch vehicle has made significant progress over the past five years. This qualification structure was subjected to static qualification testing. The 6 m (20 ft) tall fairing was constrticted of a carbon fiber composite grid structure that was over-wrapped to create a laminated skin. Upon completion of curing and machining, the fairing was cut in half to create ... |
|
| Reactive Flow Control System Using Intelligent Control Modules for Virtual Aerodynamic Shaping |
DEC 2002 |
|
| Authors:
Mehul P. Patel; Troy S. Prince; Richard M. Kolacinski; T. T. Ng; Alan B. Cain; ORBITAL RESEARCH INC CLEVELAND OH
|
| A proof-of-concept closed-loop reactive flow control methodology using discrete intelligent control modules for virtual aerodynamic shaping of air vehicles is developed. Discrete suction control technique integrated with dynamic pressure sensors and a closed- loop controller forms the basis of the intelligent control modules, which are then coordinated by a higher-level controller to enable a desired flow effect on the surface of the air vehicle. Static and dynamic wind tunnel tests ... |
|
| Nonlinear Aeroelasticity for Hypersonic Flight Vehicles |
26 NOV 2002 |
45 pages |
| Authors:
Scott Zillmer; Daniel Ortega; Raul Mendoza; Geojoe Kuruvila; BOEING CO HUNTINGTON BEACH CA
|
| Built a multidisciplinary system for nonlinear, trimmed, static aeroelastic analysis of air vehicles. Integrated all modules - CFL3D Performs aero (Euler/Navier-Stokes) analysis - COMETRAN Maps aero forces to structural nodes - PATRAN Maps temperatures to structural nodes - NASTRAN Performs structural analysis - Spline3D Maps structural deformation to aero grid - CSCMDO or Perturbs aero volume grid RexMesh - TRIM Finds control surface deflections to zero-out pitching moment - DEFLECT ... |
|
| Testing Conducted on Wall-Hanging Troop Seats |
12 SEP 2002 |
57 pages |
| Authors:
Rachael Testerman; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| This report presents the data collected during testing conducted at NAWCAD Patuxent River, Maryland. The tests conducted were static load tests and were conducted on wall-hanging troop seats. Four seats were tested, all of them being of the three-man configuration. Tests were conducted for the Defense Logistics Agency and the Air Force. All photographs and data collected from the testing are contained herein. |
|
| Hardware Verification Integrating Deductive With Algorithmic Technologies |
14 APR 2002 |
12 pages |
| Authors:
Zohar Manna; STANFORD UNIV CA DEPT OF COMPUTER SCIENCE
|
| The work supported under this grant can be divided into four closely related areas: (1) Verification of real-time and hybrid systems; (2) Static analysis; (3) Automata-based deductive verification of real-time systems; and (4) Abstraction and modularity in deductive verification. The results obtained in these areas have been reported in conference and journal papers referenced in the report. Most of the methods developed have been implemented and evaluated for their utility ... |
|
| Post-Buckling Test Response and Analysis of Fiber Composite Grid-Stiffened Structures |
01-Apr-2002 |
12 pages |
| Authors:
Adrian Viisoreanu; John E Higgins; Peter M Wegner; Barry VanWest; AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
|
| A composite grid-stiffened cylindrically curved panel was fabricated and tested in static compression. Joint tension test coupons were fabricated from an unused portion of the panel construction and tested to failure in direct tension (rib/skin pull-off). Pre- and posttest analyses were performed to assess initial and overall buckling response. Comparisons to test data were made to assess: 1) the influence of skin pocket buckling on overall structure response, 2) the ... |
|
| Determination of Temperature/Moisture Sensitive Composite Properties |
SEP 2001 |
73 pages |
| Authors:
John S. Tomblin; Lamia Salah; Yeow C. Ng; NATIONAL INST FOR AVIATION RESEARCH WICHITA KS
|
| An investigation of the temperature and moisture sensitive composite properties was conducted. Results provide an evaluation of the degree of conservatism of the 50 deg F margin from glass transition values commonly used to determine a material system's operational limit (MOL). A series of dynamic mechanical analysis (DMA) and static mechanical tests were performed using specimens conditioned at three relative humidity levels and tested at six different temperatures for two ... |
|
| Light Armor |
JUN 2001 |
35 pages |
| Authors:
BULGARIAN ACADEMY OF SCIENCES SOFIA INST OF METAL SCIENCE AND TECHNOLOGY OF METALS
|
| Using former laboratory experience on examination the properties of silicate-polymer composite of low density and high protective ability against shaped charges armor specimens are designed and tested in range conditions within a wide scope of characterizing parameters. The results obtained are processed and analyzed. Conclusions and suggestions about the future work are made. |
|
| Composite Structures, Volume 50, No. 4, December 2000. Special Issue: Experimental Validation of Theoretical Predictions for Composite Structures. Composite Structures Workshop Held in Monash University, Melbourne, Australia on 18-19 Nov 1999 |
08 JAN 2001 |
126 pages |
| Authors:
MONASH UNIV CLAYTON (AUSTRALIA) DEPT OF MECHANICAL ENGINEERING
|
| Conference Proceedings to Include the Following: "Experience With the Finite Element Modelling of a Full-Scale Test of a Composite Aircraft Control Surface" "Material Characterization of Laminated Composite Plates Via Static Testing" "Evaluating the Soundness of Bonding Using Shearography" "Combined Numerical-Experimental Model for the Identification of Mechanical Properties of Laminated Structures" "Control of Beam Vibrations by Means of Piezoelectric Devices: Theory and Experiments" "Impact Energy Absorption Characteristics of Composite Structures" "Experimental ... |
|
| Destructive Expendables |
JAN 2001 |
6 pages |
| Authors:
Duane A. Warner; Mike Pershing; Stavros Androulakakis; Gordon Schmidt; William Lappert; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| Phase II of the Laser Beamrider Countermeasures program is complete. Phase II consisted of static tests where antiaircraft missiles were exposed to detonating 4Omm and 7Omm warheads. All of the tested missiles received significant damage. Also some dynamic tests occurred where the effects of these detonating warheads on the flights of missiles were observed. For those tests where the detonations were properly timed the missiles failed to reach the target. ... |
|
| Exact Analysis of the Cache Behavior of Nested Loops |
2001 |
13 pages |
| Authors:
Siddhartha Chatterjee; Erin Parker; Philip J. Hanlon; Alvin R. Lebeck; NORTH CAROLINA UNIV AT CHAPEL HILL DEPT OF COMPUTER SCIENCE
|
| The authors develop from first principles an exact model of the behavior of loop nests executing in a memory hierarchy by using a nontraditional classification of misses that has the key property of composability. They use Presburger formulas to express various kinds of misses as well as the state of the cache at the end of the loop nest. They use existing tools to simplify these formulas and to count ... |
|
| Design and Development of the Image Scanner for Lineate Imaging Near Ultraviolet Spectrometer (LINUS) |
DEC 2000 |
98 pages |
| Authors:
Richardo C. Kompatzki; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Lineate Imaging Near Ultraviolet Spectrometer (LINUS) is a spectral imager that works in the ultraviolet region of the spectrum, and its purpose is to study atmospheric gas plumes. This thesis project is part of an ongoing effort to field-test the first version of LINUS by mid-2001. It concentrates in the development of the ultra-precise servo system that controls the pointing/scanning system of the instrument. The closed-loop angular-position servo is ... |
|
| Selected Data Set from Static and Rolling Experiments on a 65 Deg. Delta Wing at High Incidence |
01 OCT 2000 |
|
| Authors:
X. Z. Huang; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCHCENTER
|
| This data set is selected from an extensive set of experimental results obtained for configurations with a 650 delta wing under static as well as large-amplitude high-rate rolling or pitching conditions at high incidence. The experiments were performed under a joint research program on "Non-Linear Aerodynamics under Dynamic Maneuvers" by the National Research Council of Canada (NRC (IAR)), the U.S. Air Force (USAF (AFOSR, AFRL)) and the Canadian Dept. for ... |
|
| Development of Shrouded Turbojet to Form a Turboramjet for Future Missile Applications |
JUN 2000 |
101 pages |
| Authors:
Suleiman M. AL-Namani; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Development of shroud to form part of an afterburner for a turbo- ramjet engine which has a possible application for high speed long range missile applications. Research has been conducted on scram-jet engines with little or no emphasis on a turbojet/ramjet combined cycle engines. With the possibility of the turbojet providing the thrust at subsonic conditions and the ramjet providing the thrust at supersonic conditions. A small ... |
|
| F/A-18 Replacement Umbilical Qualification Testing |
24 MAR 2000 |
30 pages |
| Authors:
Susan Jahan; Greg Miller; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| This report discusses the F/A-18 umbilical qualification testing. Topics discussed are the qualification test program, lightning test requirement, lightning zone and test parameters, pass/fair criteria, captive carriage tests, static pull tests, and ejection tests. |
|
| An Empirical Study of Operating Systems Errors |
2000 |
17 pages |
| Authors:
Andy Chou; Junfeng Yang; Benjamin Chelf; Seth Hallem; Dawson Engler; STANFORD UNIV CA COMPUTER SYSTEMS LAB
|
| We present a study of operating system errors found by automatic, static, compiler analysis applied to the Linux and OpenBSD kernels. Our approach differs from previous studies that consider errors found by manual inspection of logs, testing, and surveys because static analysis is applied uniformly to the entire kernel source, though our approach necessarily considers a less comprehensive variety of errors than previous studies. In addition, automation allows us to ... |
|
| Performance of a Ducted Micro-Turbojet Engine |
SEP 1999 |
92 pages |
| Authors:
Garth V. Hobson; Raymond P. Shreeve; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A turbo-ramjet engine configuration has possible applications in missiles or Uninhabited Aerial Vehicle's (UAV's). In order to study possible configurations, a Sophia J450 turbojet engine was used, with varying shroud configurations, to compare static thrust and specific fuel consumption measured in a test rig. A baseline shroud, which covered the engine, was tested with three ducts lengths aft of the J450's exhaust. Bach duct length ... |
|
| Biomechanical Model of the Human Thorax for Impact Analysis |
SEP 1999 |
62 pages |
| Authors:
Timothy A. Hughes; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The Biomechanical response of the human thorax was studied using the finite element method by the classic stiffness method. The main focus was on validation of the model. The model was subjected to static and dynamic forces applied at the sternum. A plate was adhered to the sternum area and the model was subjected to a dynamic load to simulate an impact load similar to a ... |
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STATIC TESTS
