| An Analysis of Undersea Glider Architectures and an Assessment of Undersea Glider Integration into Undersea Applications |
Sep 2012 |
91 pages |
| Authors:
William P Barker; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF SYSTEMS ENGINEERING
|
 | Currently, buoyancy driven underwater gliders are deployed globally to gather oceanographic data from across the world's oceans. This thesis examines the utility of underwater gliders within the context of providing additional U.S. Navy capabilities. An extensive survey of available underwater gliders was undertaken and the resultant survey pool of ten gliders was down selected to five gliders of fixed wing configuration. A comprehensive architectural analysis was then conducted of seven ... |
|
| Optimization of Nanoscale Zero-Valent Iron for the Remediation of Groundwater Contaminants |
22 Mar 2012 |
127 pages |
| Authors:
Andrew W McPherson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
|
| Nanoscale zero-valent iron (nZVI) is an emerging tool for the remediation of groundwater contaminants. The nanoparticles are capable of reductively destroying or immobilizing a wide range of contaminants. Their small size results in a high surface area to mass ratio, making them much more reactive compared to their more-coarse predecessors. Small particle size also allows nZVI particles to be injected directly into contaminated areas via a well, limiting the above-ground ... |
|
| Dynamo: A Model Transition Framework for Dynamic Stability Control and Body Mass Manipulation |
Nov 2011 |
28 pages |
| Authors:
Brian Yamauchi; IROBOT CORP BEDFORD MA
|
| Ground robots, such as the iRobot PackBot, have saved hundreds of lives in Iraq and Afghanistan by helping soldiers safely inspect and disarm improvised explosive devices (IEDs) (Figure 1). However, even state-of-the-art robot control systems fail to approach the adaptive, versatile mobility demonstrated by humans and animals on an everyday basis. In order to extend the applicability of ground robots to a wider range of missions, fundamental advances are needed ... |
|
| Research and Development of a High Power-Laser Driven Electron-Accelerator Suitable for Applications |
12 Jun 2011 |
36 pages |
| Authors:
Donald Umstadter; Sudeep Banerjee; Bradley Shadwick; NEBRASKA UNIV LINCOLN
|
| During Phase I of the HRS program, the team from the University of Nebraska, Lincoln(UNL) made use of the unique capabilities of their high-power laser system to perform an extensive study of the physical phenomena and control mechanisms involved in one such module: the conversion of laser light into high-brightness, nearly monoenergetic electron beams. During Phase II of the project, we continued work on the development of laser-driven accelerators. The ... |
|
| Suitability of Commercial Transport Media for Biological Pathogens under Nonideal Conditions |
Jan 2011 |
10 pages |
| Authors:
Kyle Hubbard; Gregory Pellar; Peter Emanuel; ARMY EDGEWOOD CHEMICAL BIOLOGICAL CENTER APG MD
|
| There is extensive data to support the use of commercial transport media as a stabilizer for known clinical samples; however, there is little information to support their use outside of controlled conditions specified by the manufacturer. Furthermore, there is no data to determine the suitability of said media for biological pathogens, specifically those of interest to the US military. This study evaluates commercial off-the-shelf (COTS) transport media based on sample ... |
|
| Emergence of Dissipative Structures in Current-Carrying Superconducting Wires (Postprint) |
26-May-2009 |
13 pages |
| Authors:
G A Levin; P N Barnes; J S Bulmer; J P Rodriguez; J A Connors; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| We discuss the emergence of a spontaneous temperature and critical current spatial modulation in current-carrying high-temperature superconducting wire. The modulation of the critical current along the wire on a scale of 3-10 mm forces a fraction of the transport current to crisscross the resistive interface between the superconducting film and normal metal stabilizer attached to it. This generates additional heat that allows such structure to be self-sustainable. Stability and the ... |
|
| Computational Aerodynamics Modeling of the Reefed Stages of Ringsail Parachutes |
Apr-2009 |
88 pages |
| Authors:
Jason D Christopher; RICE UNIV HOUSTON TX DEPT OF MECHANICAL ENGINEERING AND MATERIALS SCIENCE
|
| The Team for Advanced Flow Simulation and Modeling (T*AFSM) at Rice University has been using the Stabilized Space-Time Fluid-Structure Interaction (SSTFSI) they developed to model parachute aerodynamics. The complexity of ringsail parachutes requires additional techniques for successful modeling of the reefed stages. Methods developed for this purpose include sequential shape determination, which is an iterative method for determining a shape and corresponding flow field, and coupled FSI using a circumferentially ... |
|
| Stability Improvements of DNA Photonic Devices |
20-Dec-2008 |
16 pages |
| Authors:
Naoya Ogata; OGATA RESEARCH LAB HOKKAIDO (JAPAN)
|
| Recent research results on DNA-lipid complexes have shown various attractive features on E/O or O/E devices, optical memories, switches and sensors by intercalating optical dye into DNA double helix、while DNA devices absorbed water under high humidity which led to decreases of optical functions. However, it is possible to improve the stability of DNA devices by encapsulating the DNA-lipid complexes into sol-gel materials or synthetic polymers so that water permeation is ... |
|
| Rapid Chemical Stabilization of Soft Clay Soils |
Oct-2008 |
10 pages |
| Authors:
Susan D Rafalko; Thomas L Brandon; George M Filz; James K Mitchell; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF CIVIL AND ENVIRONMENTAL ENGINEERING
|
| Since World War II, the military has sought methods for rapid stabilization of weak soils for support of its missions worldwide. Over the past 60 years, cement and lime have been the most effective stabilizers for road and airfield applications, although many nontraditional stabilizers also have been developed and used. The most effective stabilizer to increase the strength of two soft clay soils within 72 h for contingency airfields to ... |
|
| The Flight Control System of the Hovereye (Trademark) VTOL UAV |
MAY 2007 |
17 pages |
| Authors:
Paolo Binetti; Daniel Trouchet; Lorenzo Pollini; Mario Innocenti; Tarek Hamel; Florent Le Bras; BERTIN TECHNOLOGIES MONTIGNY-LE-BRETONNEUX (FRANCE) UAV SYSTEMS
|
| This overview paper covers the flight control system of Bertin Technologies Hovereye(registered name) mini vertical takeoff and landing (VTOL) UAV, including development, verification in simulation and flight test results. Hovereye is a demonstrator of a short range reconnaissance platform in support of army units engaged in urban combat, such as in peace-keeping missions, with an electro-optic day or night camera payload.. This system stabilizes the vehicle, provides operators with easy ... |
|
| Novel High-Performance Grid Fins for Missile Control at High Speeds: Preliminary Numerical and Experimental Investigations |
May-2006 |
53 pages |
| Authors:
Erich Schuelein; Daniel Guyot; DEUTSCHES ZENTRUM FUR LUFT-UND RAUMFAHRT (DLR) GOETTINGEN (GERMANY) INSTITUT FUER AERODYNAMIK UND STROEMUNGSTECHNIK
|
| This work investigates locally swept grid fins (lattice wings) in terms of their performance over conventional lattice wings at high speeds. The study includes numerical simulations of the supersonic flow around conventional and locally swept planar and lattice wings of infinite span as well as direct force measurements at corresponding realistic finite span models in the Ludwieg Tube Facility at DLR (RWG). The investigations were performed at free-stream Mach numbers ... |
|
| The Thermal Stabilization of Vaccines Against Agents of Bioterrorism |
SEP 2005 |
292 pages |
| Authors:
C. R. Middaugh; KANSAS UNIV CENTER FOR RESEARCH INC LAWRENCE
|
| Vaccines are without doubt the most powerful approach currently available for the prevention of the deleterious effects of toxins and infectious agents that might be used in a bioterrorism against civilians or military personnel. Recent disclosures have indicated that numerous countries/or terrorists organizations may possess biological weapons that could indeed be used for this purpose. Likely, agents include anthrax, botulinum toxin, smallpox, tularemia, plague, and Venezuelan equine encephalitis. With the ... |
|
| Anthrax Vaccine Powder Formulations for Nasal Mucosal Delivery |
04 AUG 2005 |
18 pages |
| Authors:
G. E. Jiang; Sangeeta B. Joshi; Laura J. Peek; Duane T. Brandau; Juan Huang; Matthew S. Ferriter; Wendy D. Woodley; Brandi M. Ford; Kevin D. Mar; BECTON DICKINSON AND CO FRANKLIN LAKES NJ
|
| Anthrax remains a serious threat worldwide as a bioterror agent. A second-generation anthrax vaccine currently under clinical evaluation consists of a recombinant Protective Antigen (rPA) of Bacillus anthracis. We have previously demonstrated that complete protection against inhalational anthrax can be achieved in a rabbit model, by intranasal delivery of a powder rPA formulation. Here we describe the preformulation and formulation development of such powder formulations. The physical stability of rPA ... |
|
| Nonlinear Control Systems |
21 JUN 2004 |
53 pages |
| Authors:
Christopher I. Byrnes; Alberto Isidori; WASHINGTON UNIV ST LOUIS MO
|
| This project researched the development of a systematic feedback design methodology for shaping the steady-state response of complex systems. The design issues comprising this task include the stabilization of unstable systems and the design of feedback laws enabling a system to asymptotically track a signal and to asymptotically reject unwanted disturbances. The model used for complex systems are lumped nonlinear systems as well as linear and nonlinear distributed parameter systems ... |
|
| Fin Stabilizers As Maneuver Control Surfaces |
DEC 2003 |
131 pages |
| Authors:
Martin G. Sarch; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Roll angle is often a limiting factor during high-speed turns and repetitive turning maneuvers. Navy and Coast Guard surface ships are designed for high-speed operation. Sharper turns at higher speeds and repetitive high- speed turns can increase ship survivability by helping these vessels avoid incoming threats. This is particularly true if the amount and direction of roll during the turn is controlled since the ship's susceptibility to radar and other ... |
|
| Enhancement of Efficiency of Operation of High-Speed Aircraft Engine Elements by Means of Separation Flow Controlling |
20 OCT 2003 |
3 pages |
| Authors:
N. V. Guryleva; M. A. Ivankin; O. M. Kolesnikov; G. N. Lavrukhin; D. V. Merekin; TSAGI (CENTRAL AEROHYDRODYNAMIC INST) ZHUKOVSKY (RUSSIA)
|
| Results of investigations of the mechanism of appearance and destruction of separation zones in supersonic gas flows are presented. Methods for controlling separation phenomena were developed to increase the operation efficiency of ducts combustors inlets and outlets of high-speed aircrafts. The main trends of investigations were: 1) Study of deceleration flows in ducts of various shapes with pseudoshock; 2) Development of non-traditional manners of spatial implementation of combustion in supersonic ... |
|
| FlexTAC: An Advanced Submarine Control Surface and Actuation System |
JUL 2003 |
39 pages |
| Authors:
Scott Gowing; Bernie Carpenter; Yu T. Lee; Paisan Atsavapranee; David Hess; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD POPULATION AND FLUIDSSYSTEMS DEPT
|
| An electrically-actuated flexible tab was tested on a model of a submarine sternplane comprised of a fixed stabilizer with a hinged flap. The tab was built into the trailing edge of the flap and was tested for its ability to control overall lift and reduce the torque required to rotate the flap itself. Shape memory alloy wires, embedded in a flexible silicone compound along the length of the tab, pulled ... |
|
| SEEDLING Proposal to Establish Pilot Data for a Consortium on Magnetic Nanoparticle Assemblies: A New Tool for Drug Delivery, Sensors and Electronic Devices |
MAY 2003 |
15 pages |
| Authors:
Judy S. Riffle; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF CHEMISTRY
|
| Complexes of magnetic nanoparticles with polymer dispersion stabilizers can lead to well-defined magnetic dispersions and also to precursors for magnetic microspheres. Thus, complexes of block copolymers containing both hydrophilic and hydrophobic dispersion components with magnetite nanoparticles have been prepared and characterized. In-vitro cell survival assays of the hydrophilic complexes suggest a relationship between cell survival and proliferation and the molecular weight (and hydrophilicity) of the polymer dispersants (higher molecular weight ... |
|
| Hierarchical Robust and Adaptive Nonlinear Control Design |
20 FEB 2003 |
50 pages |
| Authors:
Wassim M. Haddad; GEORGIA INST OF TECH ATLANTA SCHOOL OFAEROSPACE ENGINEERING
|
| The authors proposed the development of a general multiechelon hierarchical nonlinear switching control design framework that minimizes control law complexity subject to the achievement of control law robustness. In particular, a unified dynamical systems framework for a general class of systems possessing left-continuous flows was developed. This report also discusses hybrid control, impulsive dynamical systems, nonnegative dynamical systems, compartmental systems, nonlinear switching control, and adaptive control. Areas of application for ... |
|
| Main Battle Tank Flexible Gun Tube Disturbance Model: Three-Segment Model |
OCT 2002 |
27 pages |
| Authors:
Henry J. Sneck; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| A rational approach to disturbance rejection is proposed and applied to a simple three degree-of-freedom flexible gun tube model using feedforward and feedback compensation. The first two natural frequencies of the pin-free and cantilever tube are matched by adjusting the dimensions of the rigid segments and the stiffness of the torsional springs that join them. It was found that, contrary to the previously analyzed two degree-of-freedom segment model, the muzzle-end ... |
|
| Nitric Oxide Depth-Profiles of Aged Double-Based Gun Propellants |
OCT 2002 |
14 pages |
| Authors:
R. A. Pesce-Rodriguez; P. E. Marsh; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| As part of a propellant/epoxy compatibility study, double-base perforated stick gun propellant was downloaded from tank rounds subjected to temperature/humidity cycling for one month. The propellant was analyzed by traditional HPLC methods and found to have experienced no significant depletion of stabilizer. Analysis by a new desorption-GC-MS method yielded depth-profiles of nitric oxide (NO) that indicated localized decomposition at propellant surfaces. Surfaces of the propellant that had been in direct ... |
|
| The Role of the Immune Cell Cytoskeleton in Breast Cancer Immunity: Particular Relationship Between Actin and p38 MAP Kinase |
JUL 2002 |
7 pages |
| Authors:
Alex W. Tong; Tyler Curiel; Schuang Wei; BAYLOR RESEARCH INST DALLAS TX
|
| Deformation of the cytoskeleton activates intracellular signaling pathways, including those governing differentiation. Based on the observation that monocytes reverse transmigrating through endothelial cells spontaneously undergo differentiation into dendritic cells (DCs), we hypothesized that the cytoskeleton modulation could affect DC differentiation. Monocytes were cultured with granulocyte M-CSF (GM-CSF) plus IL-4 to induce differentiation into immature DCs. The microtubule stabilizer paclitaxel significantly reduced DC cd1a and CD40 without affecting CD54, CD80 and ... |
|
| Robust Control Design for the Elevation Axis Stabilization of the M256E1 Long Gun |
26 APR 2001 |
18 pages |
| Authors:
V. R. Marcopeli; M. S. Ng; C. R. Wells; GENERAL DYNAMICS CORP STERLING HEIGHTSMI LAND SYSTEMS DIV
|
| A key feature of the Abrams tank is the ability to deliver precision fire during on-the-move vehicle operation. The increased flexibility of a longer gun tube presents a significant additional challenge to stabilization system design. To address the increased difficulties of this problem, an approach to gun stabilization is presented that uses modern robust control techniques to achieve muzzle-pointing accuracy. Such control design methods are model-based, and thus require an ... |
|
| Main Battle Tank Flexible Gun Tube Disturbance Model Three Segment Model |
26 APR 2001 |
15 pages |
| Authors:
Henry J. Sneck; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| A rational approach to disturbance rejection is proposed and applied to a simple three-degree-of-freedom flexible gun tube model using feedforward and feedback compensation. The first two natural frequencies of the pin-free and cantilever tube are matched by adjusting the dimensions of the rigid segments and the stiffness of the torsional springs that join them. It was found that, contrary to the previously analyzed two degree-of-freedom segment model, the muzzle-end segment ... |
|
| Robust Nonlinear Control Theory with Applications to Aerospace Vehicles |
DEC 2000 |
4 pages |
| Authors:
Richard Murray; John Doyle; CALIFORNIA INST OF TECH PASADENA CONTROL AND DYNAMICAL SYSTEMS
|
| This grant was an AASERT award that was part of the AFOSR PRET Center on Robust Nonlinear Control Theory with Applications to Aerospace Vehicles, which operated from 1995-2000. This AASERT award augmented the parent grant and was focused on developing real-time algorithms for generation of feasible trajectories for mechanical systems that respect the input constraints (actuator magnitude and rate limits). The focus of the PRET center was fundamental research in ... |
|
| Aerodynamics of the 120-mm M831A1 Projectile: Analysis of Free Flight Experimental Data |
NOV 2000 |
49 pages |
| Authors:
Keith P. Soencksen; James F. Newill; Peter Plostins; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The 120-mm M831A1 projectile is a low-cost training projectile used by U.S. armor troops. For the last several years, program managers have received feedback from the users that in some cases, M831A1 impact performance did not appear consistent with the current M831A1 computer correction factor. Based on this information, a low-scale but in-depth experimental analysis of the projectile was conducted to assess its aero-ballistic qualities and ... |
|
| Nonlinear Control Systems |
NOV 2000 |
64 pages |
| Authors:
Christopher I. Byrnes; Alberto Isidori; WASHINGTON UNIV ST LOUIS MO DEPT OF SYSTEMS SCIENCE AND MATHEMATICS
|
| In this report we summarize our recent research on the development of a systematic methodology for the design of feedback laws achieving stabilization and regulation of nonlinear control systems. We consdier the stabilization and control of both lumped nonlinear systems and nonlinear distributed parameter systems. The principal control objective is output regulation, the ability of the output of a system to track a desired signal while rejecting signals produced by ... |
|
| A Study of Phase Equilibria and Transformations in the Nb-Ti-Al System |
31 OCT 2000 |
62 pages |
| Authors:
Vijay K. Vasudevan; N. Giridhar; B. Natarajan; K. Madangopal; CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND METALLURGICAL ENGINEERING
|
| In this project, research effort was directed into phase equilibria and transformations in the Nb-Ti-Al system and in multicomponent gamma titanium aluminides. The sequence of transformations site occupancies and stable phases in a 37Nb-37Ti-26Nb alloy were established, together with tie-lines at a number of temperatures between 1000 - 1300 deg C. The effect of beta-phase stabilizers, boron additions and thermal history on transformation pathways. modes, kinetics ... |
|
| Robust Nonlinear Control Theory with Applications to Aerospace Vehicles |
23 MAR 2000 |
22 pages |
| Authors:
Richard M. Murray; Gary Balas; John C. Doyle; Jerrold E. Marsden; CALIFORNIA INST OF TECH PASADENA
|
| The focus of this program is fundamental research in general methods of analysis and design of complex uncertain nonlinear systems. The approach builds on our recent success in blending robust and nonlinear control methods with a much greater emphasis on the use of local and global techniques in nonlinear dynamical systems theory. Specific areas of accomplishment include real-time trajectory generation for unmanned aerial vehicles, geometric mechanics and nonlinear stabilization, linear ... |
|
| Launcher Integrated Diagnostics Demonstration |
2000 |
7 pages |
| Authors:
Dente D. Poland; Stuart A. Fogel; R. P. Cole; G. G. Olmsted; JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
|
| This paper presents the results to date of the Launcher Integrated Diagnostics Demonstration (L-IDD), which involves the development of the Launcher Integrated Diagnostics System (L-IDS) that monitors components within the Trident II Launcher Subsystem and estimates their "health." During Phase I of this project, possible monitoring areas were researched, and a prototype L- IDS was developed and tested. During Phase II, the prototype L-IDS was refined and installed on an ... |
|
| Development of a Plastic Stabilizer for the M865 Training Projectile |
MAY 1999 |
23 pages |
| Authors:
James Garner; Mark Bundy; James Newill; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The U.S. Army Research Laboratory (ARL) has fabricated and tested a preliminary version of an injection-moldable plastic M865 training round stabilizer assembly. This preliminary stabilizer (flare) is made from polyetheretherketone (PEEK) and is expected to handle the in-bore and out-of- bore aerothermal environments sufficiently to conform to the performance of the present M865 flare. A more refined flare assembly that matches physical properties of center-of-gravity location and weight, as compared ... |
|
| A New Approach for Service Life Evaluation of Gun Propellant |
Aug-1998 |
10 pages |
| Authors:
James A Wilson; NAVAL SURFACE WARFARE CENTER CRANE DIV IN
|
| The ability to predict how long gun propellant will remain serviceable (i.e., safe and functional) has been a concern of the US Navy for decades. The initial ordnance service life program began in 1944. Historically, service life programs have provided very limited extensions for service life of gun propellant. One of the primary reasons for this short coming is that gun propellant contains nitrate esters (nitrocellulose, nitroglycerin, or both). Nitrate ... |
|
| Neutralization of VX Nerve Agent (Without Stabilizer) with Sodium Hydroxide |
FEB 1998 |
|
| Authors:
Steven R. Harlacker; EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUNDMD
|
 | This report provides information from two tests studying the hot (90 degree) NaOH neutralization of VX without stabilizer in the 12 Liter Mettler reaction calorimeter. Both tests yielded a two phase (liquids) hydrolysate in which VX was not detected (20 ppb detection limit); and the volume of the upper phase appeared to be less than that generated in reactions of hot NaOH and VX with stabilizer. Aside from differences (attributed ... |
|
| Agent Neutralization Study. II: Detoxification of HD with Aqueous Bleach |
JAN 1998 |
|
| Authors:
John B. Samuel; William T. Beaudry; Dennis K. Rohrbaugh; Linda L. Szafraniec; Ann B. Butrow; EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUNDMD
|
| A series of neutralization studies was conducted by reacting varying amounts of HD with aqueous hydrochlorite (OCL-) solution to evaluate the use of bleach as an alternate means of destroying stockpiles of HD. A small vacuum jacketed glass reactor was used to react CASARM grade HD and one ton container HD sample. One mid- scale reaction with ton container HD was also conducted. Exotherms were observed in each reaction, and ... |
|
| MAXPAC Test Program Final Presentation |
DEC 1996 |
61 pages |
| Authors:
Joseph Morris; AEROJET PROPULSION DIV SACRAMENTO CA
|
| This report summarizes the results of a United States Air Force funded effort to demonstrate the Multi-Axis Pintle Attitude Control (MAXPAC) system. The MAXPAC system is a spin-off of the Fourth Generation Escape Systems Technology Demonstration Program. MAXPAC uses four discrete, pintle-controlled rocket nozzles to provide variable thrust in three axes. The intent is to provide an under-seat retrofit for the Advanced Concept Ejection Seat (ACES) II replacing the current ... |
|
| Smart Opto Mechanic Polymer Devices |
08 NOV 96 |
15 pages |
| Authors:
Mark G. Kuzyk; WASHINGTON STATE UNIV PULLMAN DEPT OF PHYSICS
|
| We have demonstrated that polymer optical fiber can be built into smart photomechanical devices that have the ability to sense strain and to make mechanical adjustments accordingly. The first bulk device demonstrated is an all optical vibration stabilizer that is capable of keeping the position of a mirror fixed to within one part in 10(exp 8). This device is unique in that no electronics are used: light powers the device; ... |
|
| Vibration Measurements on the Phalanx Electro-Optical Stabilization System |
SEP 96 |
155 pages |
| Authors:
James E. Schmidt; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The installation of the new PHALANX Surface Mode (PSUM) upgrade will enable the PHALANX to handle a wider range of threats, such as a small boat approaching the ship. The objective of the research described in this thesis was to measure the vibration of a prototype forward looking infrared (FLIR) camera stabilizer system during live-fire tests to evaluate its performance. Uniaxial, triaxial, and angular accelerometers were mounted at 19 different ... |
|
| Natural Attenuation Remediation of Lead-Contaminated Soils at a Former Open Burning Propellant Disposal Site |
MAY 1996 |
9 pages |
| Authors:
Gretchen A. Haupt; BADGER ARMY AMMUNITION PLANT BARABOO WI
|
| Lead-contaminated surface soils at an eleven-acre former open-burning propellant disposal site at the Badger Army Ammunition Plant were scheduled for remediation by phosphate-addition soil stabilization and soil cover construction. Laboratory treatability tests performed to select an effective mix of stabilization compounds suggested that native soils (a 5 - 7 foot thick loess deposit) underlying the contaminated topsoil had a high capacity to immobilize/attenuate lead naturally, without the addition of artificial ... |
|
| Canted Rudder System for Pitch Roll and Steering Control. |
06 FEB 1996 |
|
| Authors:
Larrie D. Ferreiro; Timothy C. Smith; William L. Thomas III; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The invention is directed to a system for stabilizing a marine vehicle against rolling and pitching motions and for providing steering control to the marine vehicle. The system includes at least two rudders rotably affixed to the marine vehicle aft of marine vehicle propellers and canted approximately 450 to the vertical; at least two rudder actuators, one actuator associated with each of the rudders, for providing a predetermined dynamic rotational ... |
|
| Sub-Optimal Control of Rigid Spacecraft Reorientation Using Three Momentum Wheels |
DEC 95 |
159 pages |
| Authors:
Gregory W. Schultz; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This thesis addresses sub-optimal employment of 3 momentum wheels for large angle reorientation of rigid spacecraft with minimal induced spacecraft motion during maneuvers. In addition to development of general theory for 3 wheel vehicles, simulation results for a vehicle using momentum wheels for secondary attitude control (GPS Block IIR) are compared to results for a vehicle using them for primary attitude control (the Hubble Space Telescope), to demonstrate practical applications ... |
|
| Real Time Stabilizing System for Pulsating Activity. |
05 SEP 1995 |
|
| Authors:
Mark L. Spano; William L. Ditto; Alan Garfinkel; James N. Weiss; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Electrical stimuli delivered to cardiac tissue at times determined from a chaos stabilizing algorithm, converts arrhythmia activity to periodic beating by an interbeat interval shortening action, utilizing real time calculation based on a system parameter experimentally determined from intervention by the electrical stimuli. |
|
| Progress Report and Proposed Work for Year 2. ONR Contract N00014-89-J- 1227 |
AUG 95 |
13 pages |
| Authors:
John L. Hall; JOINT INST FOR LAB ASTROPHYSICS BOULDER CO
|
| The focus of the work is the development of precision laser techniques and their application to physical problems of outstanding scientific interest, including laser frequency stabilization at/below the Hertz level, cold atomic 'fountains', optical frequency standards, ultra-resolution spectroscopy, measurement of optical frequencies, and advanced tests of physical principles. The main thrusts in the near future are to complete our frequency measurements of the stabilized Nd laser, to exploit our new ... |
|
| Underwater Vortex Shedder. |
23 MAY 1995 |
|
| Authors:
Thomas A. Galib; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A self.propelled torpedo with four stabilizer fins having an "X" orientation when the torpedo is running submerged through water. Each stabilizer fm has a fixed leading section and a trailing rudder section with a rigid trailing edge. Bands of tape are wrapped fore and aft around each rudder section to provide opposed trailing extensions of tape which are adhered together and slitted to form a trailing extension of flexible material ... |
|
| Absorption of Water and Lubricating Oils Into Porous Nylon |
10 JAN 95 |
|
| Authors:
P. A. Bertrand; AEROSPACE CORP EL SEGUNDO CA MECHANICS AND MATERIALS TECHNOLOGY CENTER
|
| Oil and water absorption from an into sintered porous nylon can be described by infiltration into the pores of the material. This process can be modeled by a diffusion-like mechanism. For water absorption, we find formal diffusion coefficient of 1.5 x 10(exp-4) sq cm/min when the nylon is initially dry. The diffusion coefficient is 4 x 10(exp-6) sq cm/min when the nylon is oil- impregnated prior to an exposure. In ... |
|
| Vibration Control Using Chaotic Motion Stabilizers |
20 DEC 94 |
30 pages |
| Authors:
David L. Don; Edward S. Regan; RHEOLOGY RESEARCH GAITHERSBURG MD
|
| Chaotic Motion Stabilizers transform chaotic behavior into predictable periodic motion. Our product enhances the performance of active damping systems, eliminates the need for damping devices in some applications, and increases the variability of passive damping methods. We have based our product on the observance that chaotic attractors typically have infinite numbers of unstable periodic orbits. The device attempts to stabilize existing orbits in the attractor - not create new ones. ... |
|
| Storm Water Pollution Prevention Plan for Construction Activities |
SEP 94 |
261 pages |
| Authors:
ENGINEERING-SCIENCE INC ATLANTA GA
|
| All construction sites as Robins AFB, Georgia with disturbed land area of five acres or greater are required to obtain a permit from the Georgia Environmental Protection Division to discharge storm water. Obtaining the storm water discharge permit is a two-step process: Submitting a Notice of Intent to discharge storm water; and Compliance with the State of Georgia's General Permit requirements. A primary component of compliance with Georgia's General Permit ... |
|
| Stable Integrated Microwave to Optical Modulator |
31 DEC 91 |
14 pages |
| Authors:
WESTINGHOUSE DEFENSE AND ELECTRONICS CENTER BALTIMORE MD ADVANCED TECHNOLOGY DIV
|
| The key technical objective for this research program is to integrate quantum well lasers (QWLs), detectors and GaAs MESFETs to produce a monolithic integrated microwave to optical modulator on semi-insulating GaAs substrates. |
|
| Vegetation as an Agronomic Method of Dust Control on Helicopter Training Areas at Fort Rucker, Alabama |
SEP 91 |
92 pages |
| Authors:
Richard A. Price; Todd R. Higgins; Bobby L. Folsom Jr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| Intense, low-altitude training in rotary wing aircraft (helicopters) on the predominantly infertile, sandy clay soils of Fort Rucker, Alabama, has led to erosion of the soil surface and the generation of dust clouds of such severity as to impair pilot vision and increase wear and maintenance costs on the helicopters. Pilot safety became an issue, and some severely eroded training areas were closed. Some of the possible approaches to alleviate ... |
|
| Horizontally Moveable Weight Stabilizing Device. |
28 MAY 1991 |
|
| Authors:
Michael J. Sullivan; Douglas G. Dussault; Daniel Dinsmore Jr; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A stabilizing device for an underwater towed body includes a keel attached to the bottom surface of the towed body to provide for any major correction for its rolling motion of the towed body is accomplished by moving horizontally a trim weight housed inside the towed body. The horizontal movement of the trim weight is controlled by the power applied to the electric motor which is determined by the rolling ... |
|
| Aircraft Operations from Runways with Inclined Ramps (Ski-Jump) |
MAY 91 |
19 pages |
| Authors:
Elijah W. Turner; WRIGHT RESEARCH AND DEVELOPMENT CENTER WRIGHT-PATTERSON AFB OH
|
| The use of inclined ramps to launch aircraft from short runways is proposed as a possible solution to the runway denial problem in Europe. Past efforts to launch aircraft in this manner, including a very successful program conducted by the US Navy to launch the T-2C, F-14, and F-18 aircraft, are reviewed. An analytical study was conducted for the launch of the F-16, F-15, A- 10, A-7D and F-4E from ... |
|
Reports by Keyword(s)
STABILIZATION SYSTEMS
