| SAFT Li-ion Technology for High Rate Applications |
NOV 2006 |
|
| Authors:
Kamen Nechev; Bridget Deveney; Teymur Guseynov; John Erbacher; Stephen Vukson; SAFT AMERICA INC COCKEYSVILLE MD
|
 | SAFT will present an update of its state-of-the art Very High Power (VHP) Lithium-ion (Li-ion) technology. The VHP cells are currently being qualified for use in military aircraft applications as well as in future military hybrid vehicles. Additionally, their use in Directed Energy Weapon (DEW) systems is also being explored. |
|
| Aircraft Thermal Management Using Loop Heat Pipes: Experimental Simulation of High Acceleration Environments Using the Centrifuge Table Test Bed (Postprint) |
NOV 2006 |
12 pages |
| Authors:
Andrew J. Fleming; Quinn H. Leland; Kirk L. Yerkes; Levi J. Elston; Scott K. Thomas; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
 | The objective of this paper is to describe the design of an experiment that will examine the effects of elevated acceleration environments on a high-temperature, titanium-water loop heat pipe for actuator cooling. An experimental test setup has been designed for mounting a loop heat pipe on an 8-ft-diameter centrifuge table, which is capable of radial accelerations of up to 12-g's. A high-temperature PAO loop will interface the condenser of the ... |
|
| The Effects of Ejection Seat Cushion Design on Physical Fatigue and Cognitive Performance |
NOV 2006 |
39 pages |
| Authors:
Joseph Pellettiere; Julia Parakkat; David Reynolds; Manikandan Sasidharan; Muhamed El-Zoghbi; Aernout Oudenhuijzen; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| The detrimental effects of prolonged sitting during long-duration flights include deep vein thrombosis, pressure sores, and decreased awareness and performance. However, the cushion is often the only component of the ejection seat system that can be modified to mitigate these effects. This study investigated the long-duration effects of sitting in four ejection seat cushions over eight hours. Subjective comfort survey data and cognitive performance data were gathered along with comparative ... |
|
| Aircraft Battery Design Concept for Improved Ultra Low Temperature Performance (Postprint) |
NOV 2006 |
6 pages |
| Authors:
John K. Erbacher; Gary J. Loeber; Sarah M. Owens; Cameron A. Riepenhoff; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| The AFRL, Electrochemistry and Thermal Sciences Branch has evaluated numerous aircraft battery designs and chemistries since the 1960s. Recent experiments on advanced battery chemistries have shown poor performance at ultra low temperatures below -20 deg C. Aircraft battery designs stress low weight and volume and maximum capacity. One design concept uses lower capacity cells in a series parallel configuration to reduce overall battery resistance and should also improve ultra low ... |
|
| Trajectory Control for Very Flexible Aircraft |
30 OCT 2006 |
47 pages |
| Authors:
Christopher M. Shearer; Cesnik E. Carlos; MICHIGAN UNIV ANN ARBOR
|
| This paper focuses on trajectory control of the 6-DOF body fixed reference frame located on a very flexible aircraft. The 6-DOF equations of motion of a reference point on the aircraft are coupled with the aeroelastic equations that govern the geometrically nonlinear structural response of the vehicle. A low-order strain-based nonlinear structural analysis coupled with unsteady finitestate potential flow aerodynamics form the basis for the aeroelastic model. The nonlinear beam ... |
|
| Aircraft Rotor Surface Coating Qualification Testing Aircraft Rotor Surface Coating |
25-Oct-2006 |
30 pages |
| Authors:
NATIONAL CENTER FOR DEFENSE MANUFACTURING AND MACHINING LATROBE PA
|
| Due to the harsh environment and operating conditions of military aircraft rotor blades, the maintenance costs are extensive. Currently the Department of Defense "DoD" is interested in pursuing a new coating that could be applied to various helicopter rotor blades that would increase the life over the current method. The Aviation and Missile Research, Development and Engineering Center "AMRDEC" located at Redstone Arsenal, AL selected the NCDMM to coordinate the ... |
|
| Conventional Arms Transfers to Developing Nations, 1998-2005 |
23 OCT 2006 |
|
| Authors:
Richard F. Grimmett; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| This report is prepared annually to provide Congress with official, unclassified, quantitative data on conventional arms transfers to developing nations by the United States and foreign countries for the preceding 8 calendar years for use in its policy oversight functions. All agreement and delivery data for the United States are government-to-government Foreign Military Sales (FMS) transactions. Some general data are provided on worldwide conventional arms transfers by all suppliers, but ... |
|
| Air War Beyond the First Island Chain: Implications of China's Military Modernization for U.S. Maritime Strategy |
23 OCT 2006 |
25 pages |
| Authors:
David Little; NAVAL WAR COLL NEWPORT RI JOINT MILITARY OPERATIONS DEPT
|
| Since China's provocative military exercises across the Taiwan straits in March 1996, the strait remains calm and little has changed diplomatically, but the balance of power in the region is changing. The remarkable rate in which China has modernized its military in the last decade has left many to question its intentions and whether its modernization is based on a change in maritime strategy. Many analysts believe that if China ... |
|
| The Development of an Environmentally Compliant, Multi-Functional Aerospace Coating Using Molecular- and Nano-Engineering Methods |
02 OCT 2006 |
135 pages |
| Authors:
S. R. Taylor; G. J. Shiflet; J. R. Scully; R. G. Buchheit; W. J. van Ooij; K. Sieradzki; R. E. Diaz; C. J. Brinker; A. L. Moran; MISSISSIPPI UNIV MEDICAL CENTER JACKSON
|
| The coating system presently used on military aircraft is constrained in function (e.g., static color, low glint) and limited to the use of toxic, chromate-based compounds for the mitigation of corrosion. This report summarizes a MURI that was tasked to establish the scientific foundation for a military aerospace coating with expanded functionality and environmental compliance. By implementing advances in molecular and nano-engineered materials, an academic team has identified the enabling ... |
|
| Alenia Shm Fiber Optic Bragg Grating (Fobg) Strain Sensors Technology: Applications And Requirements |
01-Oct-2006 |
13 pages |
| Authors:
Mario Iodice; F P Camerlingo; G Cavaccini; A Ciliberto; C Voto; F Pezzuti; ALENIA AERONAUTICA SPA TORINO (ITALY)
|
|
| Practicability Issues of Sensor-Based Damage Detection on Military Platforms |
01-Oct-2006 |
11 pages |
| Authors:
Klaus-Peter Kress; KT-SYSTEMS GMBH EUERBACH (GERMANY)
|
|
| A Review of Recent Laser Illumination Events in the Aviation Environment |
OCT 2006 |
11 pages |
| Authors:
Van B. Nakagawara; Kathryn J. Wood; Ron W. Mongomery; FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROMEDICAL INST
|
| Flight crewmember exposure to laser light, while operating an aircraft at night, has resulted in glare, flashblindness, and afterimage. Temporary visual impairment and the distraction, disorientation, and discomfort that can accompany it often result in hazardous situations. A database of aviation reports involving laser illumination of flight crewmembers has been established and maintained at the Civil Aerospace Medical Institute. A review of recent laser illumination reports was initiated to investigate ... |
|
| Review of Methods and Approaches for the Structural Risk Assessment of Aircraft |
OCT 2006 |
|
| Authors:
Paul White; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
|
| This report looks at the published literature on methods and assumptions made in performing structural risk assessments on aircraft. Because the major contributor to the risk of structural failure is fatigue, most methods of risk assessment involve modelling the effect of fatigue growth by some probabilistic method. Many risk assessments use the equivalent initial flaw size approach to allow for the variability in fatigue crack growth. Common errors in the ... |
|
| Aging Aircraft NDE: Capabilities, Challenges, and Opportunities (Preprint) |
OCT 2006 |
10 pages |
| Authors:
E. A. Lindgren; J. S. Knopp; J. C. Aldrin; G. J. Steffes; C. F. Buynak; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| U.S. Air Force aircraft are managed by Damage Tolerance Assessment (DTA) and Nondestructive Evaluation (NDE) plays a critical role in insuring their flight safety. This paper provides an overview of current NDE capabilities for aircraft structures. The potential migration to Condition-Based Maintenance (CBM) will require NDE to evolve from detection of defects to characterization of their location and size. This represents multiple significant challenges as aircraft have many material and ... |
|
| Distributed Mechanical Actuators for Design of a Closed-Loop Flow-Control System (Postprint) |
OCT 2006 |
19 pages |
| Authors:
Mehul P. Patel; Richard M. Kolacinski; S. K. Patil; T. T. Ng; ORBITAL RESEARCH INC CLEVELAND OH
|
| This report was developed under a SBIR contract. Active flow control experiments were conducted on a two-dimensional, single-element NACA 4312 airfoil to assess the performance of vortex generators and gurney flaps as lift-enhancing devices for the control of longitudinal dynamics of an air vehicle. The vortex-generators are shown to delay boundary layer separation and provide an increase in the lift coefficient for angles of attack above 12 deg, and the ... |
|
| Three Component Velocity Measurements in the Tip Vortex of a Micro-Air-Vehicle |
SEP 2006 |
88 pages |
| Authors:
Hong J. Park; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The purpose of this research was to improve the MAV that will be used for battle damage assessment and reconnaissance or local surveillance through the experiments in AFIT wind tunnel. The experiments were performed to investigate the wing displacement and wing tip vortex interaction. To conduct the experiments, telescopic survey tool and tri-axial hot-wire anemometer was utilized. The results indicate that wing tip displacement of the flexible wing was approximately ... |
|
| Metrics of METOC Forecast Performance and Operational Impacts on Carrier Strike Operations |
SEP 2006 |
116 pages |
| Authors:
Jeremy Callahan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY
|
| We have developed metrics of the performance and operational impacts of METOC support to strike operations conducted on operational aircraft carriers (CVs). Our goal was to assess that support and make recommendations on improving it. We adapted an existing automated real time METOC metrics system, which was developed for land based training missions, for use on CVs by developing a new data collection form, new metrics, and new collection, analysis, ... |
|
| Studies in Forecasting Upper-Level Turbulence |
SEP 2006 |
191 pages |
| Authors:
Christopher T. Kuhl; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY
|
| Encounters with turbulence generated by complex topography, convection, or mechanical forcing present a significant threat to military aircraft operations. Properly forecasting the initiation, duration, and intensity of such encounters is a tremendous challenge to forecasters often resulting in the over-forecasting of turbulence. Over-forecasting the presence or intensity of turbulence can result in unnecessary mission delays, cancellations, and re-routing. The lack of observations and the fact that turbulence is a microscale ... |
|
| Prebond Inspection Techniques to Improve the Quality of Adhesive Bonding Surface Treatments |
SEP 2006 |
|
| Authors:
Andrew N. Rider; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
|
| Adhesively bonded repairs to metallic aircraft structure can be used in a variety of applications to solve difficult maintenance issues where traditional mechanically fastened repairs are often unsatisfactory. For example bonded repairs have been applied to reduce stress intensity in fatigue prone areas of aircraft and, thereby, extend service life of the component, providing substantial maintenance savings. Despite their valuable contribution to aircraft maintenance, bonded repairs are treated as fail-safe ... |
|
| Probabilistic Risk Assessment: Impact of Human Factors on Nondestructive Evaluation and Sensor Degradation on Structural Health Monitoring (Preprint) |
SEP 2006 |
10 pages |
| Authors:
John C. Aldrin; Enrique A. Medina; Daniel A. Allwine; Mohammed Qadeer Ahmed; Joseph Fisher; Jeremy S. Knopp; Eric A. Lindgren; COMPUTATIONAL TOOLS INC GURNEE IL
|
| Managing human factors in nondestructive evaluation is critical to maintain inspection reliability. Reliability of structural health monitoring systems is particularly sensitive to sensor degradation over time. To investigate the impact of these issues, probabilistic models for risk assessment and cost-benefits analysis have been developed. Quantitative studies are presented evaluating the effects of variations in probability of detection associated with human factors, plus in-situ sensor degradation on life cycle measures such ... |
|
| Investigation of a Model-Assisted Approach to Probability of Detection Evaluation (Preprint) |
SEP 2006 |
10 pages |
| Authors:
J. S. Knopp; J. C. Aldrin; Lindgren E.; C. Annis; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| This paper presents a model-assisted probability of detection (MAPOD) study for inspection of a two-layer airframe structure. Eddy current measurements for varying crack length around fastener holes in a two-layer aluminum structure are studied using both experimental and model-generated data. New statistical algorithms are used to calculate the probability of detection. Good agreement was achieved between empirical and model-assisted approaches. |
|
| Estimating the Distribution of the Sizes Of Flaws Remaining After an Inspection (Preprint) |
SEP 2006 |
11 pages |
| Authors:
Peter W. Hovey; Alan P. Berens; Jeremy Knopp; DAYTON UNIV OH DEPT OF MATHEMATICS
|
| The U.S. Air Force plans for maintenance and retirement of aircraft based in part on fatigue crack growth models. Periodic inspections are used to help assess airworthiness and plan for future inspections. Nondestructive inspections are not perfect so some cracks are missed and the likelihood that an individual crack is detected is a function of the size of the crack when inspected. Additionally, the crack size distribution is related to ... |
|
| Need for Robust Sensors for Inherently Fail-Safe Gas Turbine Engine Controls, Monitoring, and Prognostics (Postprint) |
SEP 2006 |
37 pages |
| Authors:
Alireza R. Behbahani; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| Sensor reliability is critical to turbine engine control. Today's aircraft engines demand more sophisticated sensors in the control systems, requiring advanced engine testing for component performance demonstration. Expertise in the gas turbine instrumentation community is located across the gas turbine industry itself, within several specialized university departments serving to supplement the more general research programs in gas turbine research. Sensor technology has advanced in many fields; however, implementation has been ... |
|
| Special Operations Aviation in NATO: A Vector to the Future |
Sep-2006 |
31 pages |
| Authors:
Richard D Newton; JOINT SPECIAL OPERATIONS UNIV HURLBURT FIELD FL
|
| Special operations air/aviation in NATO is coming of age. Within the alliance, NATO member nations have devoted significant resources to enhance the capabilities and maintain the relevance of their ground and maritime Special Operations Forces (SOF). That has not always been the case with the special operations air and aviation elements, though. The good news is that times are changing. It is encouraging to note that air-oriented SOF within NATO ... |
|
| Aircraft Fuel Cell Repair Equipment (AFCRE) |
09 AUG 2006 |
11 pages |
| Authors:
John M. Yerger; AIR MOBILITY WARFARE CENTER FORT DIX NJ AIR MOBILITY BATTLELAB
|
| PROBLEM: Aircraft fuel cell repair time is quite lengthy due to dated troubleshooting tools, sealant cure time and repair validation. PROPOSED SOLUTION: Use helium gas to troubleshoot leaks and validate repairs. Use new technology to remove and cure sealant. |
|
| Simulation-Based Design of a Guided-Wave Structural Health Monitoring System for a Plate-Stiffener Configuration |
AUG 2006 |
10 pages |
| Authors:
J. C. Aldrin; E. A. Medina; K. V. Jata; J. S. Knopp; COMPUTATONAL TOOLS INC GURNEE IL
|
| Through the use of integrated sensing and signal processing for damage detection, structural health monitoring (SHM) technologies are expected to improve system life cycle management. In particular, guided waves have been successfully utilized for damage identification in pipes and other structures. However, the design of guided wave applications becomes significantly more challenging as the geometric complexity of the structure increases. Structural components for aircraft wings, container tanks, and other applications ... |
|
| A Review of the History of Fire Suppression on U.S. DoD Aircraft |
13 JUL 2006 |
38 pages |
| Authors:
Donald P. Bein; NAVAL AIR SYSTEMS COMMAND LAKEHURST NJ
|
| As the Department of Defense's (DoD) Next Generation Fire Suppression Technology Program (NGP) culminates its research efforts, it is prudent to capture the history of fire suppression on DoD aircraft. This paper provides a synopsis of the history of fire suppression on DoD aircraft to provide a context against which the findings of the NGP can be assessed. The following aircraft fire suppression applications are reviewed: (1) power plant compartments, ... |
|
| Fusion of Microwave and Eddy Current Data for a Multi-Modal Approach in Evaluating Corrosion Under Paint and in Lap Joints (Preprint) |
JUL 2006 |
10 pages |
| Authors:
K. Gupta; M. T. Ghasr; S. Kharkovsky; R. Zoughi; R. J. Stanley; A. Padwal; M. O'Keefe; D. Palmer; James Blackshire; Gary Steffes; N. Wood; MISSOURI UNIV-ROLLA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Critical aircraft structures are susceptible to hidden corrosion. Find-it and fix-it approaches are inefficient as it relates to managing the problems associated with corrosion. More comprehensive corrosion information may be obtained using data fusion from several detection and evaluation methods. To this end, microwave, conventional and pulsed eddy current data from a multi-layer corroded panel, representing an aircraft lap joint, are fused and used as inputs to a structural analysis ... |
|
| Effect of Adhesive Material Properties on Induced Stresses in Bonded Sensors (Preprint) |
JUL 2006 |
10 pages |
| Authors:
Steven A. Martin; James L. Blackshire; NDE COMPUTATIONAL CONSULTANTS DUBLIN OH
|
| An analysis of the stresses induced in adhesively bonded sensors from a biaxial stress field in the underlying substrate is presented. Recent Structural Health Monitoring work has looked at using surface bonded sensors to detect and characterize damage in aircraft structures. In addition to the proper design of these systems, it is important that they be able to survive in a sometimes hostile operating environment in terms of weather, vibration, ... |
|
| Modeling a Reparable Supply Chain and Applying CPFR Concepts |
08 JUN 2006 |
68 pages |
| Authors:
Sandra Mayhall; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The Air Force supply chain includes parts required to build, fix, or maintain aircraft delivered to the warfighter to carry out missions. Industry has shown that following Collaborative Planning, Forecasting, and Replenishment (CPFR) concepts, particularly reducing inventory through accurate demand forecasts, has increased profits in part by lowering the holding costs of inventory and increasing sales. This is analogous to the Air Force increasing aircraft availability. There is scant evidence ... |
|
| Navy F/A-18E/F Super Hornet and EA-18G Growler Aircraft: Background and Issues for Congress |
08 JUN 2006 |
|
| Authors:
Christopher Bolkcom; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| The F/A-18E/F Super Hornet is the Navy's highest priority aviation modernization program. It is replacing Navy F/A-18C/D Hornet combat aircraft. The decision to undertake F/A-18E/F Super Hornet program was made during a period of great turbulence in Navy aviation modernization. During this time frame the Navy struggled to identify and implement the best way to modernize its aging fleet of F-14 fighters and A-6E attack aircraft. The A-12 program (a ... |
|
| Environmental Assessment - Construct a Ground-to-Air Transmitter and Receiver (GATR) Facility at Grand Forks Air Force Base |
06 JUN 2006 |
88 pages |
| Authors:
319 CIVIL ENGINEER SQUADRON GRAND FORKS AFB ND
|
| The United States Air Force (USAF) proposes to construct a Ground-to-Air Transmitter and Receiver (GATR) facility on Grand Forks Air Force Base (AFB), North Dakota. The Communication Squadron is preparing to install new GATR communication antennas and systems, for tactical aircraft control and commercial air traffic control. The antennas are used to provide quick deployment and high-bandwidth communications in remote, hard-to-reach areas. These systems allow operators in central locations to ... |
|
| 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
|
| 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 ... |
|
| Integrated Swarming Operations for Air Base Defense: Applications in Irregular Warfare |
JUN 2006 |
91 pages |
| Authors:
Ron Gray; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| For decades the U.S. military has been designed and funded as a conventionally superior force on the battlefield, employing the most devastating and advanced weapon systems the world has ever seen. Examples of this conventional warfare are World War I, World War II, Operation Desert Storm, and Phase I of Operation Iraqi Freedom. However, in low-intensity conflicts (LICs) or irregular warfare (IW) campaigns, U.S. forces are faced with an irregular ... |
|
| Wind Tunnel Renovation, Flow Verification and Flapping Wing Analysis |
JUN 2006 |
95 pages |
| Authors:
Curtis Hickle; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Naval Postgraduate School (NPS) Micro-Air Vehicle (MAV) wind tunnel was refurbished in this study. This wind tunnel has a 61 by 38 centimeter test section with a contraction ratio of 6.75, and testing speeds up to 9 meters per second (m/s). The objectives of this work were to create a high quality, customized facility for further MAV study, and to fully characterize the wake of the MAV at a ... |
|
| Development of a Hard-Patch Approach for Scarf Repair of Composite Structure |
JUN 2006 |
|
| Authors:
Alan Baker; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
|
| The pre-moulded (hard) patch approach for scarf repair of composite structures has several advantages compared with the conventional prepreg lay-up (soft-patch) approach, which involves forming the patch directly in the repair cavity. These include the development of patch properties which match the parent structure, much improved patch geometry (no wrinkling or ply distortion) and, importantly for aircraft employing high temperature-composites designed to operate at 177C/350F (such as JSF), reduced application ... |
|
| Air Force Roadmap 2006-2025 |
JUN 2006 |
81 pages |
| Authors:
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| This Air Force Roadmap is a capability-based force structure plan that conveys the planned recapitalization and modernization of the Air Force through 2025. It articulates the strategic foundations of the force and the distinctive air and space power capabilities this force structure provides. The end result is a powerful force structure that will dominate adversaries in air, space, and cyberspace across the spectrum of conflict, now through 2025. For presentation, ... |
|
| Options for the Navy's Future Fleet |
MAY 2006 |
112 pages |
| Authors:
CONGRESSIONAL BUDGET OFFICE (U S CONGRESS) WASHINGTON DC
|
| Since 2000, the Navy has spent an average of about $43 billion a year to buy and operate its fleet of 285 battle force ships and 4,000 aircraft. In the new 30-year shipbuilding plan that the Navy released in February, senior officials argue that the service needs 313 ships to perform all of the tasks assigned to it. Increasing and modernizing ships and aircraft as implied by that plan would ... |
|
| Global En Route Basing Infrastructure Location Model |
MAY 2006 |
213 pages |
| Authors:
Jr Miravite Alexander; Charles F. Schlegel; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The backbone of the air transportation system for the US military is the En Route System (ERS), a collection of personnel and equipment at bases throughout the world. The location of these bases in the ERS bears the marks of the Cold War legacy of the latter half of the twentieth century. While many changes to the ERS have taken place in the last 20 years, it still has a ... |
|
| Analyzing Requirements for and Designing a Collaborative Tool Based on Functional and User Input |
MAY 2006 |
10 pages |
| Authors:
Christopher K. Curtis; Chris Burneka; Vaughan Whited; David E. Kancler; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| In flightline maintenance, collaboration is an important factor in the maintainer's quest to complete a difficult or unusual repair. Technology provides a multitude of potential collaborative tools and techniques, and this must be balanced against the requirement to leverage and/or support maintainer's existing interaction skills, rather than requiring them to adapt to the technology. This paper discusses the definition of collaboration, a high-level classification of collaboration types, followed by a ... |
|
| Reduced-Order Modeling of the Random Response of Curved Beams Using Implicit Condensation (Preprint) |
MAY 2006 |
14 pages |
| Authors:
Robert W. Gordon; Joseph J. Hollkamp; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| Accurate prediction of the response of aircraft skins to acoustic loading is important in the design of future air vehicles. Much work has been reported in recent years on prediction methods which reduce a finite element model to a reduced-order system of nonlinear modal equations. This body of work has shown good results for predicting the random response of flat structures. However, there have been few studies reported on reduced-order ... |
|
| Structural Health Monitoring of an Aircraft Panel Using Continuous AE Sensor (Preprint) |
APR 2006 |
|
| Authors:
Mannur J. Sundaresan; Gangadhararao Grandhi; Francis Nkruman; NORTH CAROLINA AGRICULTURE AND TECHNICAL STATE UNIV GREENSBORO DEPT OF MECHANICAL AND CHEMICAL ENGINEERING
|
| Fatigue crack growth during the service of aging aircrafts has become an important issue and the monitoring of such cracks in hot spots is desirable. A structural health monitoring sensor system that uses acoustic emission technique for monitoring safety of such structures is described in this report. A "continuous sensor" formed by connecting multiple sensor nodes in series arrangement to form a single channel sensor is proposed to monitor acoustic ... |
|
| Value Assessment Tools For Hybrid NDE-SHM Life Management Strategies (Preprint) |
APR 2006 |
11 pages |
| Authors:
Enrique A. Medina; John C. Aldrin; Jeremy S. Knopp; Daniel A. Allwine; AUSTRAL ENGINEERING AND SOFTWARE INC ATHENS OH
|
| A variety of structural health monitoring (SHM) technologies has been proposed in the last few years for enhancing the ability to manage the life of aircraft structures. This work builds upon prior efforts comprising the development and demonstration of a software platform for integrating NDE design and product life management models. Based on probabilistic models of fatigue crack growth, detection, and repair, the demonstration cases show the ability of the ... |
|
| Characterization and Modeling of Bonded Piezoelectric Sensor Performance and Durability in Simulated Aircraft Environments (Preprint) |
APR 2006 |
|
| Authors:
James L. Blackshire; Steve Martin; Adam Cooney; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| The performance characteristics of surface-bonded piezoelectric sensors were studied under accelerated exposure conditions typically found in operational aircraft environments. In particular, sensor performance was studied for freeze-thaw, elevated heat levels, electrochemical attack, substrate bend and tensile strains, and dynamic vibration conditions. Evidence of both gradual and abrupt sensor performance degradation was experimentally observed due to undesired load transfer processes, which resulted in adverse sensor disbond and cracking events. Models were ... |
|
| Human Factors Implications of Unmanned Aircraft Accidents: Flight-Control Problems |
APR 2006 |
9 pages |
| Authors:
Kevin W. Williams; FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROMEDICAL INST
|
| This research focuses on three types of flight control problems associated with unmanned aircraft systems. The three flight control problems are: 1) external pilot difficulties with inconsistent mapping of the controls to the movement of the aircraft; 2) difficulties associated with the transfer of control from one control location to another during the flight; and 3) problems associated the automation of flight control. Specific accidents associated with each type of ... |
|
| Simulation of Recurring Automated Inspections on Probability-Of-Fracture Estimates PREPRINT |
APR 2006 |
41 pages |
| Authors:
B. D> Shook; H. R. Millwater; M. P. Enright; Jr. Hudak S. J.; W. L. Francis; TEXAS UNIV AT SAN ANTONIO
|
| On-board sensors that can detect and size a crack in a structural component are being developed and will be deployed to enhance structural health monitoring and prognosis. This research examines the simulation of recurring automated inspection resulting from simulated on-board "crack" sensors, and their potential effect on reducing the probability-of-fracture of structural components. The concept of a probability of detection (POD) curve is used to characterize the performance of the ... |
|
| Beamforming of Lamb Waves for Structural Health Monitoring (Preprint) |
APR 2006 |
11 pages |
| Authors:
Steven E. Olson; Martin P. DeSimio; Mark M. Derriso; DAYTON UNIV OH RESEARCH INST
|
| Structural health monitoring techniques are being developed to reduce operations and support costs, increase availability, and maintain safety of current and future air vehicle systems. The use of Lamb waves, guided elastic waves in a plate, has shown promise in detecting localized damage, such as cracking or corrosion, due to the short wavelengths of the propagating waves. The use of such techniques for structural health monitoring of simple plate and ... |
|
| Large Area Instant Crack Detection and Identification Using Magnetic Carpet Probe (Briefing Charts) |
Apr-2006 |
28 pages |
| Authors:
Yushi Sun; Tianhe Ouyang; INNOVATIVE MATERIALS TESTINGS TECHNOLOGIES INC AMES IA
|
|
| A Systems Engineering Approach to Integrated Structural Health Monitoring for Aging Aircraft |
23 MAR 2006 |
231 pages |
| Authors:
Alan P. Albert; Efstathios Antoniou; Stephen D. Leggiero; Kimberly A. Tooman; Ramon L. Veglio; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
|
| The United States Air Force and many of its Coalition partners have extended the original service life of some of their aging aircraft due to fiscal constraints. This life extension often requires increased periodic and in-depth inspections; increasing maintenance costs and resulting in longer periods of aircraft downtime. A structural health monitoring system for aging aircraft could reduce the current inspection burden, and thus decrease costs and system downtime. This ... |
|
| Experimental Analysis of Propeller Interactions With a Flexible Wing Micro-Air-Vehicle |
23 MAR 2006 |
149 pages |
| Authors:
Brian J. Gamble; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| An investigation into the effects of the propeller slipstream on a flexible wing micro-air-vehicle (MAV) was conducted. The Air Force Research Lab, Munitions Directorate designed a man-portable MAV with a 24 in. wingspan and 6 in. root chord to be used for battle damage assessment and reconnaissance. Two wings have been developed for this MAV. One is a rigid carbon-fiber wing and the other consists of flexible parachute material attached ... |
|
Aircraft
