| Determining the Rank of a Noisy Square Matrix Using the Characteristic Coefficients |
15 JUL 96 |
37 pages |
| Authors:
Ronald F. Gleeson; Peter F. Stiller; Robert M. Williams; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
 | Determining the rank of a matrix has several important applications. In modern array processing, the rank can be used to determine the number of targets detected. Radar normally performs this operation prior to determining the direction and velocity of each air platform. Also, sonar performs this operation before it attempts to classify submarines. It is therefore essential that the rank of the signal matrix be determined efficiently and accurately. It ... |
|
| Analysis of Plyophen Adhesives Used in Self-Lubricating Bearings |
08 APR 96 |
62 pages |
| Authors:
B. L. Ta; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Plyophen 23-900 and 23-057, two phenolic adhesives widely used in self-lubricating bearing applications, are being replaced with Plyophen 23-900X and 23-057X. The proposed alternatives are supposedly no different from the original adhesives since the change was made in the choice of catalyst used and then later removed during processing. A program was developed in which the basic material characteristics such as the chemical, mechanical, physical and thermal properties of the ... |
|
| Analysis of Ship Deployed Line Array Dynamics |
MAR 96 |
55 pages |
| Authors:
David S. Hammond; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Airborne Rapidly Deployable Technology (ARDT) is being investigated by the US Navy. One of the areas crucial for the project's a success is an in- water deployment of an array. In a recent trial, instrumented arrays were deployed from a moving ship and allowed to descend to the bottom. The purpose of this trial was to demonstrate an ability to deploy a long array of sensors in this manner such ... |
|
| Small Aircrew Ejection Simulation in U.S. Navy Aircraft |
JAN 96 |
79 pages |
| Authors:
Jeffrey P. Nichols; John J. Quartuccio; Thomas J. Marquette; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| With the Navy's recent expansion of the aircrew population to include a greater percentage of aviators, both male and female, the accommodation of small aircrew has become an important issue. All ejection seats currently used by the Navy were designed and test qualified for male aircrew ranging in weight from 135 lbs to 212 lbs. None of the Navy ejection seats have been test qualified for flight by aircrew smaller ... |
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| A Multiservice Switch for Advanced Avionics Data Networks |
1996 |
7 pages |
| Authors:
W. A. Rosen; W. A. Phipps; A. D. George; D. D. Turner; V. Gershman; M. P. Birmingham; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| With knowledge of persistent data communication traffic patterns offered to an avionics data network, modifications to the routing through the network can be made to improve total throughput and bound the latency of packets. The Multiservice Switch (MSS) is such a route-optimizing switch for streaming sensor data. The MSS has two switching fabrics: packet switching and circuit switching. The packet-switching fabric routes small control and data packets between switch ports. ... |
|
| Development of Lateral-Directional Transfer Functions for Class IV aircraft with Level 1 Flying Qualities |
DEC 95 |
64 pages |
| Authors:
Julieta E. Booz; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This report describes the computer program that was developed to support the effort currently being conducted at C. S. Draper Laboratory, Inc. to develop a hybrid, learning augmented, lateral-directional flight control system. The output from the computer program is a set of transfer functions for trimmed flight conditions which can be used to describe representative F-18 time histories. The transfer functions meet the Level 1 Flying Qualities Requirements of MlL-F8785C ... |
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| The Analysis of a Z-Fiber Reinforced Plate |
11 SEP 95 |
78 pages |
| Authors:
David J. Barrett; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Z-fiber reinforcement is being examined for its ability to increase the through-the-thickness strength of advanced composite laminates, joints and structural interfaces. This report describes the results of an analysis effort that had the goal of developing an understanding of the mechanics of z-fiber reinforcement. Specific issues that were addressed in these analyses include thermal loadings, crack initiation, crack growth and load transfer. |
|
| Fiber Optic Bragg Grating Model |
01 JUN 95 |
28 pages |
| Authors:
Ignacio Perez; Thomas Bibby; Marty Ryan; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Photoinduced Bragg Grating in optical fibers were first demonstrated by Hill et al. in 1978. In 1988 Meltz, et al. developed an external Bragg grating writing technique which had more flexibility in the choice of the Bragg period. Since then and due to their unique properties a number of sensing concepts have been proposed and demonstrated. Most of these sensors are configured as back reflectors. A more general configuration, a ... |
|
| POSIX Delta Document for the Next-Generation Computer Resources (NGCR) Operating Systems Interface Standard Baseline (Version 5) |
01 JUN 95 |
115 pages |
| Authors:
F. Prindle; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| The objective of the Next-Generation Computer Resources (NGCR) program is to standardize computer and computer component interfaces for the Navy's next generation of mission critical computing systems. The NGCR Operating Systems Standards Working Group (OSSWG) will either select a set of interface standards from commercial sources or jointly develop such standards with industry. Previously, the OSSWG established operating systems interface requirements for these standards. In this document, the OSSWG evaluates ... |
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| Quantitative Evaluation of High-Performance Flight in a Supine Crew Station Using the NAWC Dynamic Flight Simulator-Effects of Body Position and Motion |
01 JUN 95 |
63 pages |
| Authors:
Barry S. Shender; Peggy Heffner; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| In an attempt to determine if high-performance supine flight is possible, the USAF Canopy Escape Module (65 supine seat) was modified and deployed into the NAWC Dynamic Flight Simulator. With its computer generated wide field of view display and HUD, aircraft controls and high fidelity high performance fighter aircraft aeromodel, it was determined if subjects could 'fly' high performance maneuvers while supine. Seven male subjects performed a flight syllabus consisting ... |
|
| Female Upper Body Dynamic Strength Requirements in High Performance Aircraft. A Selected Bibliography |
01 JUN 95 |
51 pages |
| Authors:
Barry S. Shender; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| The Presidential Commission on the Assignment of Women in the Armed Forces has expanded the role of women in the military with its new 'gender- neutral' assignment policy. NAWCADWAR is conducting a series of tests to determine 'gender neutral' dynamic strength requirements for small stature females performing operationally relevant tasks in a high performance cockpit. This report contains a bibliography of the results of a literature review conducted prior to ... |
|
| Anemometer Design Using the Aerodynamic Drag of Circular Cylinders with Vortex Controlling Surface Protrusions |
09 MAY 95 |
22 pages |
| Authors:
Robert E. Lake; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| A series of wind tunnel and flight tests were conducted to determine the ability of four anemometer configurations to accurately measure helicopter rotor downwash outflow magnitude and direction. The anemometers were designed to use the aerodynamic drag produced on a circular cylinder as the sensing stimulus. The non-linearities in drag with respect to Reynolds numbers that are associated with smooth cylinder flow were overcome by incorporating vortex controlling surface protrusions. ... |
|
| A Comparison of Coating Alternatives for U.S. Coast Guard Aircraft |
12 DEC 94 |
21 pages |
| Authors:
Donald J. Hirst; Stephen J. Spadafora; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Current coatings used on U.S. Coast Guard aircraft contain high volatile organic compound (VOC) contents. Federal, state and local environmental agencies restrict the amount of VOCs from the use of these materials through legislation such as the Clean Air Act and local Air Quality Management District Rules. At the request of the Coast Guard, the Naval Air Warfare Center Aircraft Division Warminster investigated several low VOC candidate replacements to the ... |
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| Development of a Hydrogen-Based Annealing Process for Desulfurization of Single Crystalline, Nickel-Based Superalloy |
05 NOV 94 |
24 pages |
| Authors:
Michael A. Smith; T. H. Mickle; W. E. Frazier; J. Waldman; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| The presence of minor amounts of sulfur (1-10 ppm) in nickel-based superalloys has been associated with reduced oxidation resistance and premature spallation of protective coatings. A hydrogen annealing process has been developed by NAWCADWAR which effectively reduces the sulfur content of superalloys. The conditions which allow effective desulfurization are delineated. Diffusion of sulfur through the superalloy is found to be the rate controlling step for the process. jg |
|
| Operation Complexity for Integer or RNS Gaussian Elimination |
01 NOV 94 |
23 pages |
| Authors:
Peter R. Turner; Barry J. Kirsch; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This note addresses the question raised by Turner & Kirsch (1994) of the operation counts for the Gauss elimination solution of adaptive beamforming problems using integer arithmetic. Because the covariance matrix is positive definite hermitian, it follows that the multipliers cannot be precomputed and stored for each pair of rows. This has the effect of increasing the number of divisions from 0(N2) to 0(N)3 which for any integer arithmetic (and, ... |
|
| Physiologic Instrumentation in the Naval Air Warfare Center Human-use Centrifuge to Determine the Effects of Cumulative +Gz on Cognitive Performance |
01 OCT 94 |
50 pages |
| Authors:
Estrella M. Forster; Jeffrey G. Morrison; Edward M. Hitchcock; Mark W. Scerbo; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| A study to determine the effect of intermittent periods of positive acceleration (+Gz) on human physiology and cognitive performance was accomplished at the Naval Air Warfare Center (NAWO) human-use centrifuge. This report discusses the materials and methods utilized to obtain various physiologic measures during this study: electroencephalogram (EEG); electrooculogram (EOG); electromyogram (EMG); infrared plethysmography (lRP); electrocardiogram (ECG); and respiration rate (RM). The methods discussed herein are specific to the NAWO ... |
|
| Modified Gaussian Elimination for Adaptive Beam Forming Using RNS arithmetic |
01 SEP 94 |
38 pages |
| Authors:
Barry J. Kirsch; Peter R. Turner; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This paper is concerned with the development of a solution to the adaptive beamforming problem. The proposed solution consists of an algorithm- architecture- arithmetic combination which has the potential for very fast solution of the problem on a physically small platform which might be suitable for use on aircraft or sonobuoys. The arithmetic system used in the proposed solution is the RNS system implemented on an array of RNS processors ... |
|
| An Analysis of Gauss Elimination for Adaptive Beamforming |
09 AUG 94 |
30 pages |
| Authors:
Peter R. Turner; Barry J. Kirsch; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| There are many formulations of the Adaptive Beamforming (ABF) problem. We are motivated to use an algorithm that uses the least number of divisions or square root operations, since these operations are very expensive in time or chip area. One method solves the solution of a Hermitian matrix. The Gauss Elimination (GE) algorithm has no square roots. In this paper, we analyze dynamic range requirements and precision analysis for an ... |
|
| An Innovative DC Polarization Method for Evaluating Coatings |
23 JUN 94 |
15 pages |
| Authors:
Alan S. Fabiszewski; Vinoid S. Agarwala; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| A new coating evaluation technique based on electrochemical polarization of specimens with scribed defects was developed and evaluated as a method for assessing corrosion protection by coatings on metals. A unique scribe method was developed to create reproducible defects on the specimens in a manner such that the coating/metal interface was consistently exposed. Various organic and inorganic coating systems were examined on aluminum substrates in 3.5% NaCl solution. Electrochemical results ... |
|
| Tri-Service Committee on Corrosion, Held in Orlando Florida on 21-23 June 1994: Proceedings. Revision of Navy Paint Specifications |
JUN 94 |
8 pages |
| Authors:
David Pulley; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| The Navy maintains a number of specifications for the organic coatings applied to aircraft and ground support equipment. These documents are periodically revised and amended to include lessons learned from qualification testing, improvements in the state-of- the-art, and new regulatory requirements. To accomplish these objectives, we will revise ten different specifications by the end of this year. They include: wash primer alkyd primer, epoxy primers, polyurethane primer, acrylic lacquer, temporary, ... |
|
| Shipboard Exposure Testing of Aircraft Materials Aboard USS Ranger |
02 MAY 94 |
17 pages |
| Authors:
E. Tankins; J. Kozoi; E. Lee; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This report describes the results of 4 months of exposure to the Naval Environment of an aircraft carrier flight deck on a variety of aircraft materials and coatings. Test specimens included aluminum-lithium alloys, metal matrix composites, laminates and primerless paint. |
|
| Thermal-Mechanical Fatigue of Ti-48Al-2V Alloy and Its Composite |
1994 |
|
| Authors:
Eun U. Lee; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
 | Thermal-mechanical fatigue (tmf) and isothermal fatigue (if) of a ti- 48al-2v alloy and its composite, reinforced with tib() particles, were studied. In-phase tmf testing was conducted under the condition of a minimum temperature t(sub max)=100 degrees c and a maximum temperature t(sub max), which ranged from 750 degrees c to 1400 degrees c. the applied cyclic stress ranges were 2.8 to 28 mpa and 4.2 to 42 mpa. the if ... |
|
| Oxidation Behavior of Titanium Aluminide Matrix Materials. |
1994 |
|
| Authors:
Jeffrey Cook; Eun U. Lee; William E. Frazier; Thu-Ha T. Mickle; Jeffrey Waldman; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, experimental, imc materials and material types:, al2o3/tial, al3ti matrix, ti3al matrix, tial matrix, tixal matrix material characteristics and data fields:, activation energy, oxidation behaviors, phase diagrams parameter values relevant to the data:, 1000 c - 1100 c, 1100 c - 1200 c, 900 c - 1000 c testing and test conditions:, ... |
|
| High Temperature Behavior of Salt Coated Nicalon Fiber Reinforced Calcium Aluminosilicate Composite. |
1994 |
|
| Authors:
S. W. Wang; R. W. Kowalik; R. Sands; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| The effects of molten salt (sodium sulfate) on the high temperature mechanical behavior of Nicalon SiC fiber reinforced calcium aluminosilicate are investigated in this study. Tensile specimens were coated with sodium sulfate and exposed at 900 C for 100 hour and then tested at 900 C. It has been shown that the strength of the composite was reduced due to salt induced oxidation embrittlement. The synergistic effect of matrix cracking ... |
|
| Investigation of Advanced Lightweight Sandwich Structural Concept |
DEC 93 |
74 pages |
| Authors:
Hemen Ray; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Although the sandwich panels fabricated of honeycomb core bonded between two face-sheets are very weight-efficient, their application causes many problems such as moisture retention, extensive corrosion, ineffective edge seals, unbonding of face-sheets, and time consuming and expensive repair. In an attempt to eliminate these detrimental factors, new sandwich structural concepts are introduced. These structural concepts include bidirectionally-corrugated, lattice-core, offset-corrugated, and cross-corrugated sandwich. They are variations of corrugated sandwich. The new ... |
|
| Fabrication of Lightweight Composite Sandwich by Granular Mold |
DEC 93 |
38 pages |
| Authors:
Hemen Ray; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Although the sandwich panels fabricated of honeycomb core bonded between two face-sheets are very weight-efficient, their application causes many problems such as moisture retention, extensive corrosion, ineffective edge seals, unbonding of face-sheets, and time consuming and expensive repair. In an attempt to eliminate these detrimental factors, new sandwich structural concepts ard their fabrication methods are introduced. These structural concepts include offset-corrugated, and cross-corrugated sandwich. They are variations of corrugated sandwich. ... |
|
| Effect of Fiber-Matrix Interphase on Transverse Tensile Strength and Fracture Resistance of Organic Composite Materials |
04 SEP 93 |
279 pages |
| Authors:
Hsi C. Tsai; Annette Arocho; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Unidirectional fiber reinforced composites have a very low transverse tensile strength. This strength is much lower than the strength of the pure matrix and limits the performance of the composite system. The objective of this IR program is to develop analytical methods which predict the transverse tensile failures of organic composites and to examine how various parameters influence the transverse tensile strength and failure modes. Analytical methods developed in this ... |
|
| Methods for Experimentally Determining Commercial Jet Aircraft Landing Parameters from Video Image Data |
AUG 93 |
60 pages |
| Authors:
Richard P. Micklos; Thomas DeFiore; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| As part of its Aging Aircraft Research Program the Federal Aviation Administration is establishing a passive system of measuring aircraft landing contact parameters at commercial airports. This research involves the broader application of recent US NAVY technology used to measure landing contact conditions of Navy carrier aircraft and develop/assess Navy landing loads design criteria. This technique is based on digitizing and analyzing high resolution video images recorded by cameras strategically ... |
|
| The Adaptive Function allocation for Intelligent Cockpits (AFAIC) program: Interim Research and Guidelines for the Application of Adaptive Automation |
23 MAY 93 |
51 pages |
| Authors:
Jeffrey G. Morrison; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This report encompasses seven papers presented at the Seventh International Symposium on Aviation Psychology and adaptive automation technology. Adaptive automation differs from conventional automation in that it is capable of invoking itself (i.e. turning itself on). The research described in this report presents contemporary research into a variety of adaptive automation issues: workload, situation awareness, cycles of automation, control and authority, and alternative interface concepts. |
|
| Evaluation of Cardiac Function in Humans Wearing Combat Edge or the Tactical Life Support System when Exposed to +Gz-Acceleration |
MAY 93 |
82 pages |
| Authors:
Barry S. Shender; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Current and future high performance aircraft operate in an envelope which requires both high altitude and acceleration protection for their aircrew. Such protection includes both positive pressure breathing (PPB) and an anti-G suit. These factors have been incorporated into a variety of different aircrew clothing ensemble concepts. As part of an ongoing US Navy evaluation of these integrated life support ensembles, 7 subjects (6 male) were exposed to acceleration stress ... |
|
| Reference Model for Project Support Environments Version 1.0 |
28 FEB 93 |
130 pages |
| Authors:
P. Oberndorf; A. Brown; D. Carney; M. Zelkowitz; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This report documents a reference model that describes the full scope of functionality that is expected of a Project Support Environment (PSE). The scope includes support for System Engineering, Software Engineering, and Life- Cycle Process Engineering as well as the infrastructure services required to support these. The first three chapters contain a general description of the model. The remaining chapters provide detail of individual aspects of the model. Project Support ... |
|
| Melt Spun Intermetallic Alloys |
1993 |
|
| Authors:
William E. Frazier; Jim Chen; Rich Norhold; Douglas Cole; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: ti-48al, ti-48al-2cr-2ta, ti-50al materials related terms: boron addition, carbon addition, cast, chromium addition, cooling rate, creep resistance, dendrites, diffusion, ductility, fluidity, hardness, intermetallic containing alloys, iron addition, lamellar structure, manganese addition, melting point, metallic bonding, molybdenum addition, nickel addition, niobium addition, nitrogen addition, optical microscopy, oxygen ... |
|
| Corrosion Contribution to Environmental Cracking Failures of Critical Aircraft Parts |
1993 |
|
| Authors:
John J. DeLuccia; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: technology review materials and material types: 300m steel materials related terms: aluminum coatings, chlorides, cracking, embrittlement, fretting, intergranular fracture, low cycle fatigue, oxides, pitting corrosion, rupture, time dependence testing and test conditions: corrosive environment, dynamic loading, miscellaneous and special technical terms: aluminum bronze, high strength steels, low alloy steels, nickel alloys. ... |
|
| Hot Corrosion of Two Nicalon Fiber Reinforced Glass-Ceramic Matrix Composites |
93 |
|
| Authors:
S. W. Wang; R. W. Kowalik; R. Sands; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Hot corrosion studies were conducted to determine the effects of molten salt on Nicalon SiC fiber reinforced calcium aluminosilicate and Nicalon SiC fiber reinforced lithium aluminosilicate composites. Specimens coated with sodium sulfate were treated at 900 C for various times under air and argon atmospheres. Microstructural changes in the fiber reinforcement and matrix were investigated using electron microscopy and X-Ray diffraction. Tensile testing was carried out on as-received specimens and ... |
|
| Macromolecules for Inhibition of Corrosion and Wear |
14 DEC 92 |
30 pages |
| Authors:
Alfeo A. Conte Jr.; Vinod S. Agarwala; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| The phthalocyanines and Schiff base compounds are uniquely qualified inhibitors for corrosion. They are high electron density molecules for interaction with the metal surface, and possess large spatially arranged structures to serve as environmental barriers. Additionally, these compounds do stack-up as layered structures which provides shear planes, thus serving as lubricants. A number of these compounds have been synthesized and studied. Both electrochemical impedance spectroscopic and potentiostatic polarization techniques were ... |
|
| Finite Horizon H Infinity with Parameter Variations |
MAY 92 |
20 pages |
| Authors:
M. B. Subrahmanyam; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| In this technical note we consider the finite horizon Hoo. performance robustness problem with parameter variations. Assuming a nominal model, an iterative procedure is given to synthesize a suboptimal H controller, which yields the required performance even under parameter variations. As a by- product, an expression for the variation of performance owing to parameter variations is given. An example which illustrates the methodology is worked out under parameter uncertainties. H. ... |
|
| Carbon Fibers with Controlled Surface Chemistry |
15 APR 92 |
52 pages |
| Authors:
Roland Cochran; Thomas Donnellan; Richard W. Brotzman; Katherine Moore; K. B. Kidd; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Relatively little is known about the structure and properties of composite interphase regions or their affects on overall composite properties. The program objectives are to generate sets of carbon fibers with a range of controlled surface chemistries using glow discharge plasmas. Such treatments have been shown to produce a variety of surface functionalities that cannot be achieved with other methods. Acidic and basic surfaces will be created and characterized for ... |
|
| High Power Blue-Green B-BaB2O4 Optical Parametric Oscillator |
APR 92 |
28 pages |
| Authors:
Bruce P. Boczar; Thomas W. Hamilton; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| A high power, pulsed beta barium borate optical parametric oscillator pumped by a frequency tripled Nd:YAG laser has been constructed and characterized. Anti-reflection coatings, oscillation thresholds, pump pulse duration, pulsewidth reduction, and spectral linewidths have been evaluated. Output pulse energies of 29 mj and an average power of 0.27 watts has been achieved at 480 nm. |
|
| Environment Test Sony DIR-1000, ID-1 Digital Tape Recorder (Vibration, Temperature and Humidity) |
13 MAR 92 |
79 pages |
| Authors:
John Morgan; Paul Beer; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| This test was conducted in order to evaluate the suitability of a commercially available tape recorder as a back-up for tape recorders being developed for different military programs. The recorder was subjected to vibration simulating the flight profile of a P3 aircraft, excluding take off and landing. Temperature and humidity simulated the operational envelope of the P3. The commercial Sony DIR-1000 unit held up very well, failing only after the ... |
|
| Oxidation of MoSi2-Based Composites |
92 |
|
| Authors:
J. Cook; A. Khan; E. Lee; R. Mahapatra; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| The oxidation behavior of MoSi2-based composites reinforced with 30 vol% TiB2, ZrB2, HfB2 or SiC were tested under isothermal and cyclic conditions at temperatures from 500 to 1500 C. The effects of thermal cycling on subsequent pesting behavior were studied. A second series of cyclic oxidation and pesting tests was then performed on MoSi2 composites containing from 15 to 45 vol% TiB2 or SiC, in order to determine the effects ... |
|
| Oxidation of MoSi2-Based Composites. |
1992 |
|
| Authors:
J. Cook; A. Khan; E. Lee; R. Mahapatra; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| The oxidation behavior of mosi2-based composites reinforced with 30 vol.% tib2, zrb2, hfb2 or sic were tested under isothermal and cyclic conditions at temperatures from 500 to 1500 degrees celsius. the effects of thermal cycling on subsequent pesting behavior were studied. a second series of cyclic oxidation and pesting tests was then performed on mosi2 composites containing from 15 to 45 vol.% tib2 or sic, in order to determine the ... |
|
| The Melt Spinning of Gamma Titanium Aluminides. |
1992 |
|
| Authors:
F; Jim S. J. Chen; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| Ti-55Al and Ti-48Al-2Cr-2Ta (atomic %) were prepared by melt spinning and examined. This produced refined and homogeneous microstructures. |
|
| Wet Layup Materials for Repair of Bismaleimide Composites. |
1992 |
|
| Authors:
Paul Mehrkam; Roland Cochran; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| There is a trend in the aerospace community towards an increased use of elevated temperature composites in the leading edges of supersonic aircraft and in the structures surrounding the engine bay. These structures have complex shapes and highly curved surfaces which are difficult to repair using staged prepreg patches or bolt-on metal plates. In order to repair complex structures, a wet layup patch is required. A wet layup patch will ... |
|
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