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20060001772 Northrop Grumman Corp., El Segundo, CA USA Air Vehicles Technology Integration Program (AVTIP). Delivery Order 0020: Prediction of Manufacturing Tolerances for Laminar Flow Drake, Aaron; Bender, Anne M.; Solomon, William D., Jr.; Vavra, Andrea J.; Jun. 1, 2005; 290 pp.; In English; Original contains color illustrations Contract(s)/Grant(s): F33615-00-D-3054-0020; Proj-A071 Report No.(s): AD-A440161; AFRL-VA-WP-TR-2005-3060; No Copyright; Avail.: Defense Technical Information Center (DTIC) An examination of the effects of surface excrescences on boundary layer transition has been performed, including both experimental and computational components. The experimental study focused on stagnation-line starting condition boundary layers in incompressible flow without sweep effects. The study was performed at low-Reynolds number-less than 106-and included the effects of both adverse and favorable pressure gradients. The results for both forward and aft-facing steps indicate a substantial stabilizing effect of favorable pressure gradient on excrescence-induced boundary layer transition. These findings suggest that manufacturing tolerances for laminar flow aircraft could be loosened in areas where even mild favorable pressure gradients exist. The present study, due to its limited scope, does not provide sufficient basis for setting actual manufacturing tolerances; however, it provides a solid foundation on which follow-on examinations including compressibility effects can be built. DTIC Aircraft; Laminar Flow; Manufacturing; Wings 20060001840 Air Force Flight Test Center, Edwards AFB, CA USA Limited Characterization of the SPADS Radar System, Project ‘START’ Roessig, Keith M.; Kearl, Leonard C.; Carazo, Oscar; Ferreri, Francesco; Jun. 1, 2005; 63 pp.; In English; Original contains color illustrations Report No.(s): AD-A440351; AFFTC-TIM-05-02; No Copyright; Avail.: CASI: A04, Hardcopy The USAF Test Pilot School conducted flight tests to characterize the Weibel-manufactured Spaceport Arrival and Departure System (SPADS) radar functionality and performance for potential use as a single-station time-space-position information (TSPI) source. TSPI truth source data was measured with Advanced Range Data System (ARDS) pods for aircraft tracking, cinetheodolites for munition trajectory tracking and video bomb scoring (VBS) for bomb impact predictions. DTIC Aircraft; Impact Prediction; Radar 20060001867 North Carolina State Univ., Raleigh, NC USA Dynamically Resolved Simulation of Atmospheric Features and Turbulence Using Advanced Models and Adaptive Algorithms McRae, D. S.; Xiao, Xudong; Hassan, Hassan A.; Feb. 16, 2005; 22 pp.; In English; Original contains color illustrations Contract(s)/Grant(s): FA8718-04-C-0019 Report No.(s): AD-A440414; AFRL-VS-HA-TR-2005-1106; No Copyright; Avail.: CASI: A03, Hardcopy Development of the North Carolina State University (NCSU) adaptive high-resolution atmospheric model and the atmospheric version of the NCSU k-zeta turbulence model continued during this contract period. The boundary condition implementation at the lateral boundaries was changed to radiative type to better preserve fixed condition boundary values. A sponge layer condition was installed at the upper boundary. The solution redistribution algorithm after mesh adaptation was changed to a weighted essentially non-oscillatory algorithms in order to improve accuracy. Basic development of the turbulence model was completed and the equations are included herein. The full turbulence model was included in the code and 3-D runs were initiated to begin comparison with observation and other codes. A widely used generic 2-D windstorm case was used for confirmation and verification of the changes. initial results demonstrated the breakdown of shear layers into clear air turbulence of sufficient severity to produce 1-g vertical accelerations for aircraft. DTIC Algorithms; Atmospheric Models; Atmospheric Turbulence; Clear Air Turbulence; Simulation 20060001883 Air Force Inst. of Tech., Wright-Patterson AFB, OH USA Experimental Investigation of a Lift Augmented Ground Effect Platform Igue, Roberto T.; Sep. 1, 2005; 108 pp.; In English; Original contains color illustrations Report No.(s): AD-A440437; AFIT/GAE/ENY/05-S04; No Copyright; Avail.: Defense Technical Information Center (DTIC) 20
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 of data for comparison. Lift, torque and efficiency were measured and calculated for each setting. Pressure and velocity information was also collected at specific points around the craft when operating at different heights above ground. The results indicate a significant increase in total lift and efficiency when operating the model at close to the ground heights, in ground effect, compared to the lift produced by the propeller and motor alone. Even more significant changes were found when comparing the in ground effect results with the out of ground effect values of lift and efficiency. The study also investigated the use of Coanda nozzles on the peripheral region of the craft, and found them to be less efficient than straight nozzles with similar size and flow rates. Comparisons between the experimental results and previous computational fluid dynamic analysis are also made and presented in this study. DTIC Ground Effect (Aerodynamics); Ground Effect Machines; Helicopters 20060001888 RAND Corp., Santa Monica, CA USA American Carrier Air Power at the Dawn of a New Century Lambeth, Benjamin S.; Jan. 1, 2005; 135 pp.; In English; Original contains color illustrations Contract(s)/Grant(s): DASW01-01-C-0004 Report No.(s): AD-A440448; No Copyright; Avail.: CASI: A07, Hardcopy This report presents the highlights of the U.S. Navy’s carrier air performance during the first two major wars of the 21st century: Operation Enduring Freedom against the Taliban and al Qaeda in Afghanistan in 2001 and 2002 and the subsequent 3-week period of major combat in Operation Iraqi Freedom in early 2003 that finally ended the rule of Saddam Hussein. The report also addresses ongoing modernization trends in U.S. carrier air capability. In the first war noted above, U.S. carrier air power substituted almost entirely for land-based theater air forces because of an absence of suitable shore-based forward operating locations for the latter. In the second, 6 of 12 carriers and their embarked air wings were surged to contribute to the campaign, with a seventh carrier battle group held in reserve in the Western Pacific and an eighth also deployed and available for tasking. The air wings that were embarked in the 6 committed carriers in the latter campaign flew approximately half the total number of fighter sorties generated altogether by U.S. Central Command. As attested by the performance of naval aviation in both operations, the warfighting potential of today’s U.S. carrier strike groups has grown substantially over that of the carrier battle groups that represented the cutting edge of U.S. naval power at the end of the Cold War. The research findings reported herein are the interim results of a larger ongoing study by the author on U.S. carrier air operations and capability improvements since the end of the Cold War. They should interest U.S. naval officers and other members of the defense and national security community concerned with the evolving role of U.S. carrier air power in joint and combined operations. An extensive bibliography is included. DTIC Afghanistan; Aircraft Carriers; Iraq; Military Aviation 20060001898 Metron, Inc., Reston, VA USA Top-Down Mechanism Design Study for Multi-UAV Search and Surveillance Godfrey, Gregory A.; Oct. 31, 2005; 6 pp.; In English Contract(s)/Grant(s): W911NF-04-C-0041 Report No.(s): AD-A440491; ARO-47062.2-MA-DRP; No Copyright; Avail.: Defense Technical Information Center (DTIC) Under this seedling effort, Metron has developed and demonstrated ‘function-driven design’ technology for complex distributed systems and applied it to an Unmanned Aerial Vehicle (UAV) ground target surveillance scenario. The authors considered three types of UAV interaction mechanisms (auction/bidding methods, swapping-based methods and local optimization methods) and two different target motion models (stationary and mobile, random walkers). There are two primary breakthroughs. The first is a value potential approach to optimizing search paths based on approximating an infinite-horizon search plan. Using this value potential to dictate UAV motion improves the search performance, especially for disjoint, multimodal (patchy) probability distributions on target position. The second innovation introduces dynamic area sectoring, which allows UAVs to partition the search area dynamically and to balance the search workload across UAVs. Sectoring also eliminates the need to deconflict search paths and simplifies collision avoidance because each UAV stays inside its sector. Combining the value potential-based UAV motion and dynamic sectoring reduced the median time to target detection by up to 40 percent in this experimental testing. Based in part on the improved multi-sensor search capability developed under this 21
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Page 48 and 49: desired speech with better intellig
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attractive media for meeting the co
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20060002148 American Telephone and
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are considered and modeled as an un
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the program executes at least 100 t
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with low precision components, and
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20060002295 Pennsylvania State Univ
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losses, and boundary layer velocity
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object. The goal of this paper is t
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20060001640 General Electric Co., S
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The Advanced Volume Sensor Project
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20060001813 Michigan Univ., Ann Arb
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demonstrate that operations perform
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context of how Army installations n
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13.4% on a non-textured single-side
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ilayer structure, the DLC films not
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operating information, and a black-
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46 GEOPHYSICS Includes Earth struct
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20060002033 National War Coll., Was
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esults of this study indicate that
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Bacillus anthracis. Anthrax will be
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were evaluated throughout the exper
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20060001236 Institute of Space Medi
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20060001245 Institute of Space Medi
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III dummy was similar to those obta
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properties of hyperbolic Dirichlet
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This paper had been prepared as a t
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20060002350 BERG2 Micro-Computer Es
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Exploratory Learning; Neurobiologic
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operation of LSI is pursuited to ac
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industrial tools, and increased int
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20060001694 Motorola, Inc., Schaumb
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enchmarks in this document is meant
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contemporary team theory, adapted a
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toolkit), each of which we built to
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developmental effort. This paper il
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signal-processing algorithms, allow
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Scheduling (TIES) for efficient net
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safety, and real time performance o
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20060001877 New York Univ., New Yor
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domain. dRBAC utilizes PKI to ident
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difference in the synchronous frequ
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This paper presents an analysis of
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method relies on two mathematical t
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This paper considers the behaviour
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20060001709 Pennsylvania State Univ
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The feasibility of real time, micro
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a product of two Toeplitz data matr
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The model parameters necessary for
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estimators, and investigate the eff
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was only able to identify DMMP down
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takes I+26M, I+31M for an addition
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65 STATISTICS AND PROBABILITY Inclu
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A new approach to making voiced/unv
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near-optimal strategy with DBN serv
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non-linear system design. Finally,
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The aim of this three year project
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extraction, and object recognition.
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20060001806 North Carolina State Un
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ate of the Booster, and provide a l
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The magnetic harmonic errors of the
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20060002069 Fermi National Accelera
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micrographs as triangular and trape
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plays a significant role in the dev
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20060002468 Lawrence Livermore Nati
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20060002492 Lawrence Livermore Nati
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parameters and propose some importa
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ATAL introduced a technique for dec
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The problem is addressed of evaluat
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20060001730 Naval Underwater System
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and tip-tilt natural guide star (NG
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oscillation, bursting, chirping and
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specifications automatically. Some
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discrimination information (or the
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matching algorithm is proposed for
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20060001768 Naval Postgraduate Scho
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20060001826 Massachusetts Univ., Am
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allows the user to specify a contex
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information from these resources, u
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such as ADSL and FTTH, we are now a
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Presented is the National Optical A
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20060000076 Gemini Observatory, Hil
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Telescope (HST) at optical waveleng
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Misadjustment Expressions for Infin
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A-4 Complexity Reduced Lattice Filt
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ASYMMETRY Anthrax Biosensor, Protec
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Regulation of hTERT Expression and
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CLIMATE C-Haendelser i Vinterklimat
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Neutronics Assessments for a RIA Fr
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CRYSTAL SURFACES High-Throughput Ap
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DIELECTRICS Theoretical and Experim
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Analysis of Depletion-Region Collec
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Scenario Customization for Informat
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GALLIUM ARSENIDES InGaAs/GaAs QD Su
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HUMAN RESOURCES The Management of P
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INFRARED SPECTRA Chemical Vapor Ide
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Adaptive Transversal Filters with D
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MATCHED FILTERS Simplified Class 1
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MILITARY TECHNOLOGY The USA Air For
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NONLINEAR FILTERS A Novel Approach
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Object Classification and Registrat
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Predicting Ductile Crack Growth in
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RECURSIVE FUNCTIONS Recursive Array
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Texture Segmentation Using a Class
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SITUATIONAL AWARENESS Aspects of Sh
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STABILITY Damping Transverse Instab
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Single Target Spin Asymmetries and
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On Generalized Feussner’s Princip
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WEAR Wear Prediction of Strip Seals
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Anderson, Robert H. The Vulnerabili
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Neutronics Assessments for a RIA Fr
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Chien, Ting-Li Navigation of a Mobi
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The Modeling and Segmentation of Sp
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Fomin, Pavel Test and Evaluation of
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Hann, P. R. Technical Equivalency D
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Irons, F. H. A Phase-Plane Approach
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Kawarada, Hiroshi A Hierarchical Re
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Lai, Feipei JADE: A Hierarchical Sw
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Lopez-Perez, Javier VHF Channel Occ
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Menard, J. Scaling of Kinetic Insta
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Ney, Hermann Dynamic Programming Sp
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Using Rhythms of Relationships to U
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Resch, C. Communications Technology
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Sedra, A. S. SlCOMP: A Silicon Comp
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Steffler, E. D. Predicting Ductile
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Torkelson, Mats A VLSI Sigma-Delta
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Wheeler, P. D. Practical Adaptive N
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Zong-ye, Wang Application of Multis
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