| BANDSLIP Advancements |
Sep-2009 |
18 pages |
| Authors:
Michael Minnicino; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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 | A munition is said to be despun when the munition's angular velocity is significantly less than its band's angular velocity, thus the band slips on the munition and, hence, the name slipband. With the emergence of smart munitions that possess advanced guidance for dynamic targeting capabilities, despun munitions are seen as the best approach for survivability of these fin-stabilized, canard-guided munitions due to the reduced aerodynamic loads on the fins ... |
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| On-The-Move Nutrient Delivery System (NDS): User Acceptability of Rotary Flow Control Version |
Apr-2009 |
28 pages |
| Authors:
Scott J Montain; Susan J McGraw; Matther R Ely; Frederick Dupont; William J Tharion; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
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| Dismounted operations make it difficult for Warriors to drink and eat enough. The Nutrient Delivery System (NDS) is an add-on to collapsible bladder with drink tube personal hydration systems, and is intended to facilitate fluid and on-the-move nutrient intake. Soldier feedback (n=83) was captured regarding acceptability of NDS form and function, and their opinions regarding the merits of the system. Sixty-eight percent of the Soldiers rated the device as moderately ... |
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| Simulations of Simple Nanomachines in Carbon Nanotude Bundles Based on Chirality |
Dec-2008 |
8 pages |
| Authors:
D L Majure; R W Haskins; N J Lee; C R Welch; C F Cornwell; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
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| Single-walled carbon nanotubes (CNTs) have been studied extensively since their discovery and identification by Iijima in 1993. Their impressive mechanical, electrical, and thermal properties have created new fields of study, and the benefits of this research are just beginning to be realized. One potential use of CNTs is as a foundation for nanomachines. Another possible use, one that takes advantage of their mechanical properties, is the synthesis of high-strength, low-weight ... |
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| Fluidic Flexible Matrix Composites for Autonomous Structural Tailoring |
08-Sep-2008 |
20 pages |
| Authors:
K W Wang; Charles E Bakis; Christopher D Rahn; PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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| This project develops Fluidic Flexible Matrix Composites (F2MC) and structures that have controllable and reversible stiffness change. F2MC tubes are fiber wound and filled with fluid. If the fluid flows freely in and out of the tube then the stiffness is relatively low. Blocking the fluid flow by closing a valve results in high stiffness. In this investigation, we develop an accurate analytical model to predict and optimize F2MC tube ... |
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| Transient Thermal Response of a Projectile Misfired in a Mortar Tube |
01-Sep-2008 |
15 pages |
| Authors:
Pasquale Carluuci; Jerry Potucek; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ
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| Valuable insight into the response of various projectile features under misfire conditions can be drawn from an accurate finite element analysis. This is important since it can model the response and performance of safety critical features including vent plugs and propellant cook-off times. This paper describes the approach used to model the transient thermal analysis of a misfired Precision Guided Mortar Munition (PGMM) in a mortar tube. The analysis of ... |
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| Interaction of Shore-Parallel Geotextile Tubes and Beaches Along the Upper Texas Coast |
01-Jan-2008 |
19 pages |
| Authors:
Nicholas C Kraus; Daniel J Heilman; M C Perry; Robert C Thomas; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS INFORMATION TECHNOLOGY LAB
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| This Coastal and Hydraulic Engineering Technical Note (CHETN) summarizes initial lessons learned about ongoing field monitoring of shore-parallel geotextile tubes (GTs) constructed as beach dune cores in Galveston County, TX. Beach profile data and aerial photography collected between 1999 and 2007 are examined to evaluate the interaction of the GTs with beaches and the protection provided to public infrastructure and other landward improvements. Specific goals of the monitoring are to ... |
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| Demonstration of Clean Particle Seeding for Particle Image Velocimetry in a Closed Circuit Supersonic Wind Tunnel |
MAR 2007 |
111 pages |
| Authors:
Charles M. McNiel; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| The purpose of this research was to determine whether solid carbon dioxide (CO2) particles might provide a satisfactory, and cleaner, alternative to traditional seed material for Particle Image Velocimetry (PIV) for use in a closed circuit supersonic wind tunnel. The Air Force Institute of Technology (AFIT) closed circuit pressure-vacuum supersonic wind tunnel was utilized, which achieves a nominal Mach number of Mach 2.9 in a 2.5 inch by 2.5 inch ... |
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| Progressive Failure Analysis of Thin Walled Composite Tubes Under Low Energy Impact |
2007 |
10 pages |
| Authors:
Chian-Fong Yen; Thomas Cassin; Joel Patterson; Matt Triplett; MATERIALS SCIENCES CORP FORT WASHINGTON PA
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| Composite failure criteria have been developed for dynamic analysis of composite structures. The proposed progressive failure criteria have been integrated into an explicit dynamic analysis code for failure prediction of thin composite tubes subjected to drop weight impact tests. The results provide good correlation with experimental data for impact force histories and some critical damage modes. |
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| Vacuum Chamber Construction and Contamination Study of A Micro Pulsed Plasma Thruster |
DEC 2006 |
127 pages |
| Authors:
Jacob H. Debevec; AIR FORCE INST OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| The micro pulsed plasma thruster (micro-PPT) is a simple and versatile electric thruster capable of performing multiple missions, from precise attitude control on standard satellites to primary propulsion for nanosatellites. In order to fill this role as both industry and government move toward utilizing smaller satellites, micro-PPTs first need to be thoroughly tested on the ground. This study examines the deposition profile and rate of particle emission from the thruster ... |
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| Geotextile Tube Structures Guidelines for Contract Specifications |
SEP 2006 |
15 pages |
| Authors:
Doyle L. Jones; Jack E. Davis; William R. Curtis; Cheryl E. Pollock; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| This Coastal and Hydraulics Engineering Technical Note (CHETN) provides an example set of contract specifications for the construction of sediment-filled geotextile tube structures. This technical note represents the state of practice within the U.S. Army Corps of Engineers and is an update of the material published in Wetlands Research Program Technical Note WG-RS- 3.2, January 1999 (Davis and Landin 1999). While the example presented here can be used as a ... |
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| Posttranscriptional Regulation of the Neurofibromatosis 2 Gene |
JUL 2006 |
122 pages |
| Authors:
Long-Sheng Chang; CHILDREN'S HOSPITAL COLUMBUS OH
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| Neurofibromatosis type 2 (NF2) is associated with a homozygous inactivation of the neurofibromatosis 2 (NF2) gene. Despite intense study of the NF2 gene, the mechanism by which the NF2 tumor suppressor acts to prevent tumor formation is not well understood. The goal of this research is to examine the role of posttranscriptional regulation of the NF2 gene. With this grant support, we have confirmed that vestibular schwannomas express a distinct ... |
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| Streamwise Fluctuations of Vortex Breakdown at High Reynolds Numbers |
JUN 2006 |
49 pages |
| Authors:
Jonathan S. Connelly; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL AND ASTRONAUTICAL ENGINEERING
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| This thesis deals with the characterization of the dependence on the flow geometry of the stream wise fluctuations of the stagnation point of vortex breakdown in axisymmetric tubes and over delta wing aircraft. The statistical analysis presented herein shows that in an axisymmetric tube the 'darting' about the mean stagnation point are distributed normally for the two Reynolds numbers: Re(D) 230,000 and 300,000 (independently of the Reynolds number in the ... |
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| Human CD1d-Restricted Natural Killer T (NKT) Cell Cytotoxicity Against Myeloid Cells |
APR 2006 |
56 pages |
| Authors:
Xiuxu Chen; Jenny E. Gumperz; WISCONSIN UNIV-MADISON
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| CD1d-restricted natural killer T cells (NKT cells) are a unique subpopulation of T lymphocytes that have been shown to be able to promote potent anti-tumor responses in a number of different murine (mouse) cancer models, Little is known about whether they may play a role in preventing or controlling human cancers and in particular there is little information about whether they can function to kill cancer cells as they arise ... |
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| AUTOLOGOUS Marrow-Derived Stem Cell-Seeded Gene-Supplemented Collagen Scaffolds for Spinal Cord Regeneration as a Treatment for Paralysis |
JAN 2006 |
14 pages |
| Authors:
Myron Spector; BOSTON VA RESEARCH INST INC MA TISSUE ENGINEERING RESEARCH SERVICE
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| The long-term objective of this research is to develop a device for treating spinal cord injury. The specific aims of the proposed study are to test new types of collagen tubes and porous collagen scaffolds. Moreover, the authors will be investigating the effects of incorporating genes from nerve growth factors into the collagen scaffolds and seeding the scaffolds with marrow-derived mesenchymal stem cells. The standardized defect site is a 5-mm ... |
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| Generation and Study of Microwave Plasma Jets |
28 SEP 2005 |
19 pages |
| Authors:
Kuo; POLYTECHNIC UNIV BROOKLYN NY
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| The present report summarizes the work, under the support of the AFOSR Grant AFOSR-FA9550-O4-l-0352, starting at May 1, 2004. This research program is primarily aiming at developing plasma torches as igniters of a scramjet engine. For the hydrocarbon-fueled scramjet in a typical startup scenario, cold liquid JP-7 is injected into a Mach-2 air crossflow (having a static temperature of - 500 K); under these conditions, the fuel-air mixture will not ... |
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| Endotracheal Tube Cuff Pressure Following Intubation |
08 SEP 2005 |
25 pages |
| Authors:
Michael A. Powell; Diana Y. Duncan; David A. Pojman; Ronald E. Wyatt; Bruce A. Schoneboom; Timothy J. Samolitis; UNIFORMED SERVICES UNIV OF THE HEALTH SCIENCES BETHESDA MD
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| An endotracheal tube (ETT) is frequently necessary for airway management. Proper inflation of the ETT cuff is critical for patient safety. Pressure must be high enough to seal the trachea to prevent aspiration of regurgitated stomach contents and avoid air leaks to the atmosphere, yet low enough to allow adequate perfusion of the tracheal mucosa. This study explored the anesthesia provider's ability to correctly determine ETT cuff pressure using a ... |
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| Detonation Initiation by Annular Jets and Shock Waves |
05 MAY 2005 |
21 pages |
| Authors:
Joseph E. Shepherd; CALIFORNIA INST OF TECH PASADENA
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| This project was an experimental test of the concept of initiating detonations in PDEs with imploding shock waves. The existing 6-inch shock tube at Caltech was used to create hot, high pressure air behind a reflected shock wave. The hot air created an imploding annular shock wave when it jetted through an annular orifice into a 76 mm diameter, 1 m long tube attached to the end of the shock ... |
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| Kinetic Modeling of Temperature Driven Flows in Short Microchannels |
MAR 2005 |
10 pages |
| Authors:
Alina A. Alexeenko; E. P. Muntz; Sergey F. Gimelshein; Andrew D. Ketsdever; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF AEROSPACE AND MECHANICAL ENGINEERING
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| The temperature driven gas flow in a two-dimensional finite length microchannel and a cylindrical tube are studied numerically with the goal of performance optimization of a nanomembrane-based Knudsen compressor. The numerical solutions are obtained using direct simulation Monte Carlo method and discrete ordinate method for BGK model kinetic equation in a wide range of Knudsen numbers from 0.05 to 50. The length-to-height ratios from 5 to 30 were examined. Three ... |
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| Novel Kinetic Energy Penetrators for Electromagnetic Guns |
DEC 2004 |
8 pages |
| Authors:
Jared L. Hodge; David L. Littlefield; Stephan Bless; Andrew Short; Brad Pedersen; TEXAS UNIV AT AUSTIN INST FOR ADVANCED TECHNOLOGY
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| Hypervelocity extending projectiles launched by electric guns are candidates for providing improved lethality to the Future Combat System (FCS). A systematic investigation of rod/tube type extending projectiles shows that optimal performance is achieved with roughly equal partitioning of mass between the two components and with a rod-first orientation. Potential reduction in muzzle energy for defeat of a fixed target is very substantial. |
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| The Role of Nitrogen in Gun Tube Wear and Erosion |
DEC 2004 |
8 pages |
| Authors:
P. J. Conroy; C. S. Leveritt; J. K. Hirvonen; J. D. Demaree; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| ARL has recently made discoveries in the area of interior ballistic propellant combustion product interactions with a gun tube bore. These discoveries were based on two hypotheses. The first was that the products could and are dynamically nitriding the bore of the gun, thus creating a nitride coating which inhibits the dissociation of CO and subsequently reducing the amount of carbon uptake. The second was that the combustion products richer ... |
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| Reactions of N(+), N2(+), and N3(+) with NO From 300 to 1400 K |
08 OCT 2004 |
9 pages |
| Authors:
Anthony J. Midey; Thomas M. Miller; A. A. Viggiano; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
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| Rate constants have been measured from 300 to 1400 K in a selected ion flow tube (SIFT) and a high temperature flowing afterglow for the reactions of N(+), N2(+) and N3(+) with NO. In all of the systems, the rate constants are substantially less than the collision rate constant. Comparing the high temperature results to kinetics studies as a function of translational energy show that all types of energy (translational, ... |
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| Dynamics of Flash Tube Seals in 30-mm Ammunition |
MAY 2004 |
22 pages |
| Authors:
Stephen L. Howard; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Certain 30-mm ammunition use a flash tube to augment the primer and to provide an ignition source for the propellant. The flash tube must provide abundant hot gases/particles and pressurize the propellant bed sufficiently so that the initial burn rate of the propellant is high enough to propel the projectile to the muzzle within the few milliseconds that constitute the action time of the cannon. Rupture of the seal at ... |
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| Investigation of Characteristics of High-Power Wide-Band Plasma-Filled Traveling Wave Tubes (TWT) |
MAY 2004 |
75 pages |
| Authors:
Vladimir Perevodchikov; STATE RESEARCH CENTER OF RUSSIAN FEDERATION MOSCOW RUSSIAN ELECTROTECHNICAL INST
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| This report results from a contract tasking The Russian Federation State Research Center - All Russian Electrotechnical Institute as follows: A non-relativistic beam-plasma microwave amplifier (Plasma-Filled TrVT) based on a hybrid coupled-cavity slow-wave structure (CCSWS) with a plasma-filled transit channel has been developed in VEI. Needed improvements of these microwave tubes for their commercial and industrial applications in communication systems and microwave technology require special investigations of the main features ... |
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| Acoustic Fuel Shutoff |
24 MAR 2004 |
14 pages |
| Authors:
Anthony A. Ruffa; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| This patent application discloses a system for preventing overflow from a tank being filled. An open-ended elongated tube is disposed in a fuel tank to extend between an opening of the tank at one end and proximate to the bottom of the tank at the other end. A refueling nozzle connected to a source of pressurized fuel or other pressurized liquid has an open end extension to extend through the ... |
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| A Comprehensive Study of Vortex Breakdown Flow Mechanisms: Computational Investigation and Preliminary Control |
15 MAR 2004 |
170 pages |
| Authors:
William F. Johnson III; UNIV OF WASHINGTON SEATTLE DEPT OF AERONAUTICS AND ASTRONAUTICS
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| A modified vortex filament method is used to simulate the evolution of the transient formation of vortex breakdown. The method supports previous studies, illustrating that vortex breakdown. The method supports previous studies, illustrating that vortex breakdown is initiated by a negative vorticity gradient which triggers an inviscid self-induction feedback mechanism and when subsequently subjected to viscous effects, results in steady state vortex breakdown. The results of the method are first ... |
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| Dynamic Punch Shear Behavior of Unidirectional and Plain Weave S-2 Glass/SC15 Composites |
MAR 2004 |
36 pages |
| Authors:
Libo Ren; Bazle A. Gama; John W. Gillespie Jr.; Chian-Fong Yen; DELAWARE UNIV NEWARK CENTER FOR COMPOSITE MATERIALS
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| Dynamic punch shear behavior of unidirectional and plain weave S-2 Glass/SC15 epoxy composites is presented. An incident bar and a transmission tube assembly in compression split-Hopkinson Bar setup is used for the dynamic punch shear study. Dispersion correction methodology is used with "3-wave" analysis to convert the experimental bar data into dynamic load-displacement curves. A methodology for determining the average transverse shear strength of the composite laminates is described. The ... |
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| Echinoderm Adhesive Secretions: From Experimental Characterization to Biotechnological Applications |
2004 |
26 pages |
| Authors:
Patrick Flammang; Romana Santos; Delphine Haesaerts; MONS-HAINAUT UNIV (BELGIUM)
|
| Adhesion is a way of life in echinoderms. Indeed, all the species belonging to this phylum use adhesive secretions extensively for various vital function. According to the species or to the developmental stage considered, different adhesive systems may & recognized. (1) The tube feet or podia are organs involved in attachment to the substratum, locomotion, feeding or burrowing. Their temporary adhesion relies on a duo-gland adhesive system resorting to both ... |
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| Optimization of Off-Axis ICOS and Applications to Flow Tube Kinetics |
31 DEC 2003 |
12 pages |
| Authors:
Manish Gupta; Anthony O'Keefe; LOS GATOS RESEARCH MOUNTAIN VIEW CA
|
| In this AFOSR granting period, Los Gatos Research explored the capabilities of Off-Axis Integrated Cavity Output Spectroscopy (Off-Axis ICOS) with an especial emphasis towards flow-tube kinetics studies. Specifically, search was performed to ascertain the application of Off-Axis ICOS to spatial imaging, time-dependant phenomenon, and through-plasma spectroscopy. Achievements included developing a theoretical framework to simulate spot pattern images in the presence of spatially-inhomogeneous cavity loss, simulating the time-dependent cavity transmission for ... |
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| Physiological Evaluation of First Responder Mask |
SEP 2003 |
42 pages |
| Authors:
Ronald A. Weiss; Judith Pasternak-Silva; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The First Responder Mask (FIRM) was developed for domestic preparedness/counterterrorism personnel (e.g., firefighters, police, medical support, search and rescue, security, investigators) to provide at least 12 hr of continuous protection against chemical/biological exposure when a terrorist incident or chemical emergency required their participation. It is a powered air- purifying respirator with adjustable hood, nosecup, and one-size-fits-all neck dam configuration. This physiological evaluation of the FIRM tested its suitability for human ... |
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| Predicting the Cause of Failure in 120-mm Mortar Fins |
JUL 2003 |
13 pages |
| Authors:
J. A. Cordes; H. Rand; D. Carlucci; L. Reinhardt; S. Kerwien; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ PRECISION MUNITIONS AND DEMOLITION
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| During 2002, approximately 1500 120-mm mortars were tested at Yuma Proving Grounds, Arizona. Of the 1500 rounds, seven fell short of the 7200-m range requirement. Inspection of the short rounds indicated that short rounds lost one or more fins. This paper describes the structural analysis used to predict two proximal causes of failure. First, unequal pressure on one side of the fin can cause permanent bending, twisting, and breaking of ... |
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| Micro Piezoelectric Ultrasonic Motors |
17 JUN 2003 |
11 pages |
| Authors:
Kenji Uchino; S. Cagatay; B. Koc; S. Dong; P. Bouchilloux; PENNSYLVANIA STATE UNIV UNIVERSITY PARK
|
| This paper reviews recent developments of micro ultrasonic rotary motors using piezoelectric resonant vibrations. Following the historical background, four ultrasonic motors recently developed at Penn State University are introduced: windmill, PZT tube, metal tube, and shear-type motors. Driving principles and motor characteristics are described in comparison with the conventional ultrasonic motors. Motors with 1.5mm in diameter and O.8mNm in torque have been actually developed. |
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| Mechanics of Pressurized Plain-Woven Fabric Structures |
14 FEB 2003 |
44 pages |
| Authors:
Paul V. Cavallaro; Matthew E. Johnson; Ali M. Sadegh; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Pressurized fabric tubes, pressure-stabilized beams (known as air beams), and air-inflated structures are all considered to be valuable technologies for use in lightweight, rapidly deployable systems. The design optimization of inflated structures, in particular, depends on a thorough understanding of woven-fabric mechanics. With this in mind, the bending response of woven pressure-stabilized beams were experimentally tested and analytically investigated. Additionally, the micromechanical effects of interacting tows were examined through the ... |
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| VENTFLUX2: Single Channel Seismics, Piston Coring, and CTD Casts Associated with Gas Hydrates Offshore Vancouver Island. Report of Cruise PG01- 003 C.C.G. Vessel John P. Tully, 23 July-12 August 2001. Volume 1: Opeations |
08 FEB 2003 |
125 pages |
| Authors:
George Spence; Johanna Hoehne; Richard B. Coffin; Roy Hyndman; Robert MacDonald; NAVAL RESEARCH LAB WASHINGTON DC
|
| Cruise PGC00-003 was a collaborative experiment between the University of Victoria, the Geological Survey of Canada, and the Naval Re- search Laboratory. The program focused on seafloor vents that may be sites of significant fluid and methane flux. There were six sites with different indicators of fluid flow selected for this cruise: (1) Bullseye vent: hydrate had been recovered in this region in four piston cores collected during the 2000 ... |
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| Modeling and Operation of Single and Multiple Tube Membrane Bioreactors |
2003 |
289 pages |
| Authors:
Ellen C. England; MISSOURI UNIV-ROLLA
|
| A mathematical model was developed and experimental work completed to examine the removal of volatile organic compounds from air using single and multiple tube membrane bioreactors. Both bench-sale and a small pilot-scale reactor's performance were reasonably predicted by the mathematical model. Both model predictions and experimental work indicated the liquid suspension does not significantly contribute to the removal of contaminants from air. Experimental results indicate that membrane bioreactor performance is ... |
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| Branched Detonation in a Multi-Tube PDE |
2003 |
6 pages |
| Authors:
K. C. Tucker; Paul I. King; Frederick R. Schauer; John L. Hoke; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The Air Force is conducting research on the use of a Pulse Detonation Engine (PDE) for a wide variety of applications. The PDE derives thrust through the development of a combustion-induced detonation wave in a tube. One research objective is to increase the firing frequency in multiple tubes by reducing the ignition and detonation initiation time. Increasing the firing frequency will produce an increase in thrust. In the baseline configuration, ... |
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| Burst Testing of Filament-Wound Graphite-Epoxy Composite Cylindrical Tubes |
01 NOV 2002 |
80 pages |
| Authors:
D. J. Chang; H. A. Katzman; J. P. Nokes; P. M. Adams; S. T. Amimoto; AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
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| An experimental and analytical program was performed to elucidate the failure process of filament-wound graphite-epoxy tubes, especially the effects of wrinkled fibers and of proof testing on tube burst strength. Four types of tubes were tested: those free of flaws, those with a minor or severe helical wrinkle, and those with a hoop wrinkle. Tests included pressurization to burst, and single or multiple proof tests followed by burst. Data collection ... |
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| Induction Bonding for Structural Composite Tubes |
SEP 2002 |
48 pages |
| Authors:
Eric D. Wetzel; William A. Spurgeon; Christian J. Yungwirth; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Large structural composite tubes, prototype components for a proposed U.S. Navy application, are bonded by induction curing of an engineering adhesive. Magnetic powder is used as the susceptor material and is directly incorporated into the adhesive prior to processing. Different induction power supplies, coil designs, and adhesive formulations are investigated. Final demonstration runs bond 9-in-long, 3-in-diameter axisymmetric bondlines in 15 min. These results demonstrate for the first time the successful ... |
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| Active/Passive Structural Damping Control for Rotorcraft Systems |
31 MAY 2002 |
111 pages |
| Authors:
Norman M. Wereley; MARYLAND UNIV COLLEGE PARK DEPT OF AEROSPACE ENGINEERING
|
| Our primary objective is to augment the aeromechanical stability of bearingless and articulated rotor systems. We will focus on two damping strategies: (1) dampers based on magnetorheological fluids, (2) Hybrid elastomeric-magnetorheological fluid-based dampers. The flexbeam and torque tube substructure of the model-scale rotor will incorporate adaptive dampers based on MRF technology. Key aspects of the damper design will be undertaken utilizing quasi-steady constitutive models. MR fluids exhibit a reversible change ... |
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| Dynamic Rupture Strength of Lacquer Seal in Flash Tube of 30-mm Ammunition for the M230 Cannon |
MAY 2002 |
22 pages |
| Authors:
Stephen L. Howard; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The M788, M789, and M799 30 mm ammunition use a flash tube to augment the ignition stimulus of the primer and to provide an ignition source for the propellant bed in each round. The flash tube must be fast acting, provide abundant hot gases/particles, and increase the pressure in the propellant bed sufficiently that the initial burn rate of the propellant in the bed is high enough to propel the ... |
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| High Energy, Lead-Free Ignition Formulation for Thermate |
FEB 2002 |
21 pages |
| Authors:
Gene V. Tracy; Eugene Song; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
| An efficient ignition formulation for thermate was developed during the XM89 Enhanced Incendiary Grenade program to use as an alternative to the standard lead oxide-containing formulation used in the AN-Ml4 thermate grenade. This lead-free formulation has provided reliable ignition of the XM89 over a temperature range of -25 degrees F - 120 degrees F when using the M201 Al fuze as the initiator. Reliable ignition of the thermate could also ... |
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| Real Time Biodetection of Individual Pathogenic Microorganisms With a Rugged, Sub-Briefcase-Sized System |
JAN 2002 |
8 pages |
| Authors:
Paul E. Johnson; Michael L. Lund; Amanda S. Votaw; Jerome E. Swanson; Richard W. Shorthill; William Asprey; Julie L. Kellogg; Dehua Zhao; WYOMING UNIV LARAMIE DEPT OF PHYSICS
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| The objective of this research is to test the feasibility of an innovative approach to rare cell detection: using a CCD to image an entrained flow through a rectangular glass tube. This approach is especially useful for the detection of rare cells where a high volumetric flow rate is desired. We present the results of our work with Nile red labeled 1-micron polystyrene beads as labeled cell simulants. This technique ... |
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| iMAST Quarterly, Number 2, 2002 |
Jan-2002 |
9 pages |
| Authors:
APPLIED RESEARCH LABORATORY STATE COLLEGE PA
|
| Rhenium, as a pure refractory metal, is a very attractive material for high temperature structural and energy system applications such as solar-powered rocket engines, heat exchangers, and space and missile propulsion systems. Rhenium has many advantages over other candidate materials including tungsten. It offers excellent erosion resistance for components in high temperature rocket engines and hot gas valves. Rhenium has the second highest melting temperature next to tungsten. Unlike tungsten, ... |
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| Numerical Prediction of Residual Stress and Deformation of Cannon Tubes |
JAN 2002 |
10 pages |
| Authors:
Anthony P. Parker; EUROPEAN RESEARCH OFFICE LONDON (UNITED KINGDOM)
|
| An experimental program involving uniaxial testing of candidate gun steels was undertaken at Benet Laboratory. One striking feature is a very significant reduction in elastic modulus during load reversal. These data were then fitted numerically using a new variant of the non-linear kinematic hardening model. Numerical fits to the uniaxial behavior were incorporated into a non-linear numerical stress analysis program. Residual stress profiles for each of the candidate gun steels ... |
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| Inflatable Rigidizable Solar Array for Small Satellites |
2002 |
8 pages |
| Authors:
David Lichodziejewski; Gordon Veal; Richard Helms; Robert Freeland; Mark Kruer; L'GARDE INC TUSTIN CA
|
| With today's high launch costs, and tightening launch opportunities, low mass, cost, and packaged volume can determine the mission feasibility. L'Garde has developed the Inflatable Torus Solar Array Technology (ITSAT) to supply power to the growing fleet of small satellites in the 1kW class making forays into the space market. The ITSAT configuration with low mass and stowage volume and the inherent reliability of inflatably deployed structures is an excellent ... |
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| Pressure Sensed Non-Invasively Directly on the Extra Corporeal Bloodline Tube |
25 OCT 2001 |
|
| Authors:
R. Andersson; D. Loyd; P. Ask; LINKOEPING UNIV (SWEDEN) DEPT OF BIOMEDICAL ENGINEERING
|
 | To clinically measure blood pressure at extra corporeal bloodlines involves a hazard due to the infection risk and a risk for thrombosis formation. The aim was to design a non-invasive pressure sensor, measuring directly on a tube section. A modified tube cross-section was used to improve sensitivity. Using the developed sensing principle, a consistent relation (r=0.999) was obtained between pressure and output signal. The output was stable and an acceptable ... |
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| Beam Distortion in Doppler Ultrasound Flow Test Rigs: Measurement Using a String Phantom |
25 OCT 2001 |
|
| Authors:
R. Steel; P. J. Fish; WALES UNIV BANGOR (UNITED KINGDOM) SCHOOL OF INFORMATICS
|
| The tube in flow rigs used for testing Doppler ultrasound instruments can attenuate and distort the beam and sample volume by refraction, reflection, absorption and mode conversion. The attenuation and degree of distortion has been measured by using a moving string test object and candidate tubes have been compared. Tubes of rubber, TFE-Teflon, Perspex, heatshrink and C-Flex have been tested leading to the choice of O.8mm wall C-Flex. |
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| A Hydraulic Model of Arterial System for Study the Relationship Between Blood Distribution and Frequency Characteristics of Blood Pressure Waveform |
25 OCT 2001 |
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| Authors:
Tsung-Chieh Lee; Ming-Liang Hsiao; Shih-Tsang Tang; Shuenn-Tsong Young; NATIONAL TAIWAN UNIV TAIPEI
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| This paper was trying to find out a suitable hydraulic model for studying the frequency characteristics between blood pressure waveforms and systemic blood distribution. In the hydraulic model, the elastic tubes simulated the aorta and its major branches. The small balloons with different stiffness were used as organs. We used two kinds of tubes to test the hydraulic model and tried to find out suitable material to stimulate the aorta ... |
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| High-Rate Sputter-Deposited Tantalum Coatings on a Steel Liner for Wear and Erosion Mitigation |
AUG 2001 |
29 pages |
| Authors:
S. L. Lee; J. Cox; D. Windover; M. Audino; D. W. Matson; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
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| A prototype, rifled steel liner of 20-min inside diameter was coated with -50 to 125 micronmeter tantalum at -22.6 micronmeter/hour in krypton gas using a triode-sputter system. It was test fired with l5OO rounds for the mitigation of high-temperature and pressure wear and erosion. Growth surface analysis showed predominately alpha-phase and minimal beta-phase surface tantalum. Area detector images showed near random, slight preferred (211) crystalline orientation. X-ray diffraction revealed a ... |
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| Basic and Applied Studies of the Ram Accelerator as a High Performance Launcher |
28 JUN 2001 |
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| Authors:
Carl Knowlen; Adam P. Bruckner; UNIV OF WASHINGTON SEATTLE AEROSPACE AND ENERGETICS RESEARCH PROGRAM
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| The ram accelerator is a hypervelocity launch concept that uses a confined, in-tube ramjet propulsive cycle to generate thrust for the acceleration of a projectile. Key technical issues involving the starting and operation of the ram accelerator were investigated at fill pressures up to 200 atmospheres. The research was initiated to evaluate the feasibility of using a ram accelerator of limited length for specific applications, e.g., mobile or ship-based. In ... |
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| Construction and Testing of a Modern Acoustic Impedance Tube |
JUN 2001 |
152 pages |
| Authors:
Sean P. O'Malley; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The acoustic impedance of a material describes its reflective and absorptive properties. Acoustic impedance may be measured in a wide variety of ways. This thesis describes the construction and testing of an acoustic impedance measurement tube which employs modem Fourier Transform techniques. Two methods are employed for acoustic impedance measurement using this apparatus. One technique uses a two-microphone continuous excitation method and the other uses a single microphone transient excitation ... |
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Reports by Keyword(s)
TUBES
