| Development and Experimental Operation of a Flashboard Plasma Cathode Test Stand |
Jun 2012 |
81 pages |
| Authors:
Ali I Yilmaz; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF PHYSICS
|
 | Flashboard Plasma Cathodes (FBPCs) are potential rugged electron sources for generating high-current beams needed for future High Power Microwave Weapons. In FBPCs, dielectric material is in contact with electrodes in a vacuum. Plasma is generated by a surface flashover discharge on the surface of the dielectric between the electrodes and an electron beam is extracted from the plasma by applying an electric field between the anode and cathode. While FBPCs ... |
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| Conversion of a Micro, Glow-Ignition, Two-Stroke Engine from Nitromethane-Methanol Blend Fuel to Military Jet Propellant (JP-8) |
Jan 2012 |
147 pages |
| Authors:
Andrew L Wiegand; MICHIGAN TECHNOLOGICAL UNIV HOUGHTON DEPT OF MECHANICAL ENGINEERING AND ENGINEERING MECHANICS
|
| The goal of the thesis Conversion of a Micro, Glow-Ignition, Two-Stroke Engine from Nitromethane-Methanol Blend Fuel to Military Jet Propellant (JP-8) was to demonstrate the ability to operate a small engine on JP-8 and was completed in two phases. The first phase included choosing, developing a test stand for, and baseline testing a nitromethane-methanolfueled engine. The chosen engine was an 11.5 cc, glow-ignition, two-stroke engine designed for remote-controlled helicopters. A ... |
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| Improved Round Trip Efficiency for Air Independent Regenerative Fuel Cell Systems |
15 Oct 2011 |
7 pages |
| Authors:
Katherine E Ayers; PROTON ENERGY SYSTEMS INC WALLINGFORD CT
|
| Refurbishment of the regenerative fuel cell test stand was completed including fabricating new plumbing, cleaning for oxygen service, and final assembly in the clean room. Initial operational testing in electrolysis and fuel cell modes was completed. Materials development for the hydrogen recovery reactor continued, and a bench-top test was devised and prepared. The preliminary and final designs of the hermetically-sealed scroll compressors were completed. |
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| Comparison of Electrostatic Fins with Piezoelectric Impact Hammer Techniques to Extend Impulse Calibration Range of a Torsional Thrust Stand (Preprint) |
23 MAR 2011 |
9 pages |
| Authors:
Anthony P. Pancotti; Martin S. Hilario; Matthew Gilpin; ENGINEERING RESEARCH AND CONSULTING INC (ERC INC) EDWARDS AFB CA
|
| With growing interest and development of large pulsed plasma electric propulsion devices, it has become necessary to accurately measure their thruster performance. Direct thrust measurements are the best way to measure the impulse of a propulsion device which requires it to be mounted entirely on the thrust stand. In many cases this means the thrust stand must support 10 to 100's of kilograms and still be able to resolve mNs ... |
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| Temperature Effects on Electrospray Performance |
Mar 2011 |
103 pages |
| Authors:
Nicholas A Kreitinger; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIR/SPACE AND MISSILE PROPULSION DIV
|
| Electrospray thrusters have been considered for the past 50 years. However, the low conductivity and high volatility of liquids that were available in the past resulted in thrusters that required too much power for them to be a viable propulsion option. The lack of micro-fabrication techniques also resulted in electrospray thrusters with a large inert mass fraction. These constraints have changed in recent times with the formulation and development of ... |
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| Airborne Electro-Mechanical Actuator Test Stand for Development of Prognostic Health Management Systems |
Oct 2010 |
15 pages |
| Authors:
Edward Balaban; Abhinav Saxena; Sriram Narasimhan; Indranil Roychoudhury; Kai F Goebel; Michael T Koopmans; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
|
| With the advent of the next generation of aerospace systems equipped with fly-by-wire controls, electromechanical actuators (EMA) are quickly becoming components critical to safety of aerospace vehicles. Being relatively new to the field, however, EMA lack the knowledge base compared to what is accumulated for the more traditional actuator types, especially when it comes to fault detection and prognosis. Scarcity of health monitoring data from fielded systems and prohibitive costs ... |
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| Performance and Analysis of Vortex Oxidizer Injection in a Hybrid Rocket |
05 May 2009 |
170 pages |
| Authors:
Charles C Jones; NAVAL ACADEMY ANNAPOLIS MD
|
| A hybrid rocket motor is a type of rocket motor where fuel is placed in a combustion chamber as a solid, and then gaseous or liquid oxidizer is injected. When the two mix and are ignited, the surface of the fuel burns and the gases produced in the combustion develop thrust. Hybrid rocket motor performance is dictated by the rate at which the fuel burns. Fuel burn rate (or regression ... |
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| Experimental and Numerical Analysis of Radiometric Forces on a Heated Circular Vane in Argon (Preprint) |
13-Jan-2009 |
16 pages |
| Authors:
N Gimelshein; S Gimelshein; N Selden; C Ngalande; A Ketsdever; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Radiometric force on a 0.12m circular vane is studied experimentally and numerically over a wide range of pressures that cover the flow regimes from near free molecular to near continuum. In the experiment, the vane is resistively heated to about 419 K on one side and 394 K on the other side, and immersed in a rarefied argon gas. The radiometric force is then measured on a nano- Newton thrust ... |
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| Development and Qualification of a Specialized Gas Turbine Test Stand to Research the Potential Benefits of Nanocatalyst Fuel Additives |
DEC 2007 |
87 pages |
| Authors:
Nathan A. Kraemer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Due to the wide use of gas turbine engines, any performance improvements would yield significant impacts to many military and civilian programs. While hardware upgrades require costly replacements to existing equipment, fuel performance enhancement could provide a near term cost effective solution. This thesis research focused on the development and qualification of a suitable test stand system to provide bench testing of nanocatalyst additives for jet fuels on a full-scale ... |
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| Hawaii Energy and Environmental Technologies (HEET) Initiative |
NOV 2007 |
205 pages |
| Authors:
Richard E. Rocheleau; Robert M. Moore; Scott Q. Turn; Jr. Antal Michael J.; Michael J. Cooney; Bor-Yann Liaw; Stephen M. Masutani; HAWAII UNIV AT MANOA HONOLULU
|
| This report covers efforts by the Hawaii Natural Energy Institute of the University of Hawaii under the ONR-funded HEET Initiative that addresses critical technology needs for exploration/utilization of seabed methane hydrates and development/testing of advanced fuel cells and fuel cell systems. Methane hydrates work included: laboratory and analytical investigations of hydrate destabilization phenomena; characterization of the microbial community in marine hydrate beds; development of models to predict the fate of ... |
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| Applying a Service-Oriented Architecture to Operational Flight Program Development |
01-Sep-2007 |
5 pages |
| Authors:
Mitch Chan; 309TH SOFTWARE MAINTENANCE GROUP HILL AFB UT
|
| This article describes how a Service-Oriented Architecture (SOA) was successfully applied to reuse data and applications previously deployed in single-user, single-computer configurations. The collection of data and applications was transformed into a unified, multiuser, client-server platform through the use of open source and standards-based technologies to minimize development time, maximize interoperability, and facilitate collaboration. The collaboration resulting from the multiuser network capability and shared resources enabled progress towards the Aerospace ... |
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| Microarcjet Microthruster for Nanosat Applications (Preprint) |
22 JUN 2007 |
8 pages |
| Authors:
John Slough; J. J. Ewing; WASHINGTON UNIV SEATTLE AERONAUTICS AND ASTRONAUTICS
|
| This paper summarizes experiments and analysis of the micro-discharge microarcjet thruster. A small, very low power (2-5 Watt) micro-discharge was maintained between two electrodes in geometries compatible with application to a cold gas thruster. To evaluate the efficiency of the discharge in providing an increase in Isp and thrust, a special torsional micro-balance thrust stand, capable of micro-Newton resolution, was designed and constructed. The micro-balance thrust stand was installed in ... |
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| Thrust Stand Mass Balance Measurements of Hybrid Motor Mass Flow (Preprint) |
08 JUN 2007 |
9 pages |
| Authors:
J. D. Olliges; M. D. Killingsworth; T. C. Lilly; A. D. Ketsdever; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| A novel diagnostic technique has been developed, utilizing the Thrust Stand Mass Balance, to directly measure a time accurate mass flow from a solid-fuel thruster for systems where the mass flow rate is of the same order as the experimental error. The mass flow measurement technique has been verified using an idealized numerical simulation. Two calibration experiments have been performed to assess the dynamic response of the mass balance. First, ... |
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| Empirical Corrections to Dipole Model |
OCT 2006 |
23 pages |
| Authors:
Jonathan Miller; SCIENCE APPLICATIONS INTERNATIONAL CORP (SAIC) ARLINGTON VA CENTER FOR SEISMIC STUDIES
|
| We successfully demonstrated an empirical approach for correcting errors in the standard Dipole Model of EMI response. The Dipole Model is accurate for small targets at relatively deep burial depths but it breaks down for larger targets at shallower depths because of the interaction between the target body and the spatially non-uniform primary field. Our approach was to calculate this interaction numerically for a large set of specific target-sensor geometries ... |
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| Endurance Pump Test with MIL-PRF-83282 Hydraulic Fluid, Purified with Malabar Purifier |
JUN 2004 |
56 pages |
| Authors:
Shashi K. Sharma; Carl E. Snyder Jr.; Lois J. Gschwender; George W. Fultz; Timothy A. Jenney; DAYTON UNIV OH RESEARCH INST
|
| The possible deterioration of the fluid during use or the potential for the purifier to remove some of the performance improving additives from the fluid as well as the contaminants was investigated. Endurance aircraft hydraulic pump tests under carefully controlled conditions were previously conducted using hydraulic fluid purified with a rotating-disk and vacuum type purifier, the portable purifier manufactured by Pall Corporation, to assess the potential negative effect the fluid ... |
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| Economics of Test Stand Renovation/Rebuilding |
29 AUG 2003 |
15 pages |
| Authors:
David Harder; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| This paper provides some background information related to space infrastructure, rocket propulsion and rocket engine testing and discusses some economic considerations in the renovation/rebuilding of rocket engine Test Stands 1D and 2A at Edwards AFB CA. Various means used to minimize renovation/ re-building costs and schedule are discussed as is the current state of the commercial rocket launch business. |
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| An Experimental Investigation of Flapping Wing Aerodynamics in Micro Air Vehicles |
JUN 2003 |
111 pages |
| Authors:
Christopher J. Bradshaw; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Flapping-wing propulsion was studied experimentally through Laser Doppler Velocimetry. Measurements were both time-averaged and unsteady, and were conducted on a Micro- Air Vehicle (MAV) model developed at NPS by Professors Max Platzer and Kevin Jones. The objective of this work was to further understanding of the aerodynamics of flapping-wing propulsion. In specific, this study examined separation control on the leading fixed wing due to entrainment by the trailing flapping wings. ... |
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| The Development and Validation of Simple Empirical Models of Impingement Cooling from Full Surface Heat Transfer Coefficient Distributions |
MAR 2003 |
|
| Authors:
David R. H. Gillespie; Changmin M. Son; Peter T. Ireland; Geoffrey M. Dailey; OXFORD UNIV (UNITED KINGDOM) DEPT OF ENGINEERING SCIENCE
|
 | A simple heat transfer model of a cast passage impingement cooling system with film-cooling extraction is presented. This was derived from detailed local Nusselt number distributions on all surfaces of the system, measured in a large-scale model using transient liquid crystal techniques. These data were averaged over physically sensible regions correlated to local flow conditions. An energy balance technique was use to calculate the convective efficiency. A second conventional plate ... |
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| Influence of Combustion Condition and Air-Fuel Charge Rotation on Intensity of Heat Transfer in an IC Engine Operating on Gas Fuel |
MAR 2003 |
7 pages |
| Authors:
Janusz Rabiega; Leon Boguslawski; POZNAN UNIV OF TECHNOLOGY (POLAND)
|
| In the Heat Engineering Department of Poznan University of Technology, Poland, investigations of heat transfer processes on the wall of a single action internal combustion engine have been carried out for the last 10 years. Investigations of local heat transfer coefficients were carried out in different combustion conditions and the engine was propelled with a methane- carbon dioxide mixture (65% CH4 and 35% CO2). There were changes in timing, excess ... |
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| Comparative Lightcraft Impulse Measurements |
13 MAR 2002 |
13 pages |
| Authors:
F. B. Mead Jr.; C. W. Larson; W. M. Kalliomaa; W. O. Schall; H. A. Eckel; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST
|
| The impulse coupling coefficients of two radically different laser propulsion thruster concepts (lightcrafts), each 10 cm in diameter, have been measured under equal conditions using two different pendulum test stands. One test stand and one lightcraft of toroidal shape were provided by the U.S. Air Force Research Laboratory. The other test stand and a bell shaped (i.e. a paraboloid) lightcraft were those of the German Aerospace Center (DLR). All experiments ... |
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| Environmental Baseline Survey for Three Sites at TRW Capistrano Test Site, California |
NOV 1999 |
122 pages |
| Authors:
Craig McColloch; PARSONS ENGINEERING SCIENCE INC AUSTIN TX
|
| Assets of the Space-Based Laser (SBL) program at Capistrano Test Site (CTS), California, are being transferred from the Ballistic Missile Defense Organization (BMDO) to the United States Air Force (USAF). These assets are situated at three adjacent sites named the High Energy Propellant Test Stand (HEPTS), the Vertical Engine Test Stand (VETS), and the High Altitude Test Stand (HATS). The CTS is operated by TRW Corporation (TRW) under a long-term ... |
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| Beam Shape Control Using Shape Memory Alloys |
DEC 1998 |
76 pages |
| Authors:
Brian L. Kelly; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis presents the design and experimental results of active position control of a shape memory alloy (SMA) wire and a SMA wire actuated composite beam. The wire is a single SMA Nickel Titanium wire mounted on a single wire test stand. The composite beam is aluminum honeycomb with SMA wires embedded in one of its face sheets for active shape control. The potential applications of this experiment include thermo-distortion ... |
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| Aeropropulsion Environmental Test Facility |
SEP 1998 |
5 pages |
| Authors:
John K. Lominac; Joseph F. Boytos; ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN
|
| As part of the DoD Base Realignment and Closure process, the unique Navy capability to test aircraft engines under various environmental conditions is being transitioned to the Air Force. A new facility, using two modified sea level Air Force T-9 test cells as building blocks, formed the basis of the new design. The structural design of the test cells and test control building was based ... |
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| A Graphical User Interface (GUI) for Automated Classification of Bradley Fighting Vehicle Shock Absorbers |
FEB 98 |
80 pages |
| Authors:
Patrick Sincebaugh; William Green; Gerard Rinkus; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| In this report we describe a diagnostic system that is being utilized to evaluate the condition of armored vehicle shock absorbers. We begin by providing the motivation behind the development of the smart shock absorber test stand (SSATS). We then describe the theory required to evaluate the condition of shock absorbers. This theoretical discussion leads to a description of what real life data are acquired during a shock absorber test, ... |
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| Experimental Performance Studies of a Plate Heat Exchanger |
DEC 96 |
76 pages |
| Authors:
Darren Plath; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A plate and frame heat exchanger experimental test stand was developed. Using this test stand a performance analysis was conducted. The analysis consisted of evaluating the performance of the heat exchanger at varying flow rates and inlet temperatures, to develop an effectiveness-NTU and Log Mean Temperature Difference relationships, under steady state operation. The measured heat rates were compared to the heat rates provided by the manufacturer and good/bad agreement was ... |
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| Control Efficiency Determination of Sudden Expansion Incinerator Bldg 348, Kelly AFB, Texas |
JUN 96 |
128 pages |
| Authors:
Robert J. O'Brien; ARMSTRONG LAB BROOKS AFB TX OCCUPATIONAL AND ENVIRONMENTAL HEALTH DIRECTORATE
|
| Compliance emissions testing and Volatile Organic Compound (VOC) destruction efficiency determination were conducted on the Sudden Expansion (SUE) Incinerator located at the Kelly AFB Fuel Accessory Test Facility, Bldg 348. Compliance standards and requirements are found in Operating Permit No. 6493, as amended/renewed by the State of Texas on 24 March 1994. The purpose of the Kelly AFB SUE Incinerator is to destroy calibration fluid vapors emitted from fuel accessory ... |
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| Paladin Lock Valve Hydraulic Test Stand Upgrade and Baseline Validation |
JAN 96 |
78 pages |
| Authors:
Paul Kida; William Zepp; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL N J FIRE SUPPORT ARMAMENT CENTER
|
| A summary of the modifications done to the lock valve hydraulic test stand to enable verification of all drawing requirements is presented in this report. The validation of stand capabilities and the establishment of a performance baseline using production lock valves to KEMP manufacture. |
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| Final Modifications of NPS Hummingbird Remotely Piloted Helicopter in Preparation for Flight |
DEC 95 |
54 pages |
| Authors:
Andrew J. Booth; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The goals of this thesis were to make final design modifications and perform static testing to prepare the Hummingbird, a 150 pound, remotely piloted helicopter (RPH), for untethered flight. The major elements involved were: (1) The adaptation of a suitable, permanently-dedicated test stand for use with large-scale RPH/RPV (remotely piloted vehicle) aircraft; (2) A major rotor drivetrain improvement to the helicopter to enable it to autorotate and safely land in ... |
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| Unmanned Aerial Vehicles: A Study of Gas Turbine Application |
SEP 95 |
88 pages |
| Authors:
David P. Lobik; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A survey of commercially-available gas turbine, spark and compression ignition engines was conducted to evaluate their current and future relative suitability for the DoD's unmanned aerial vehicle (UAV) short and close range program. The effects on performance associated with reducing gas turbine engine size from full scale to UAV dimensions were examined. A small turbo-jet engine (produced in France for remotely piloted vehicles) was procured in order to evaluate what ... |
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| Aerodynamics and Aeroacoustics of Rotorcraft (l' Aerodynamique et l' aeroacoustique des aeronefs a voilure tournante) |
AUG 95 |
|
| Authors:
Horst Koerner; W. J. McCroskey; ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| The aim of the symposium is to review and discuss recent developments in aerodynamics and aeroacoustics as they apply to the rotary-wing aircraft, and to foster the future development of this class of flight vehicles. The Symposium recognizes the importance of understanding and accurately predicting the aerodynamic and acoustic characteristics of military and civil rotorcraft; and the need for improved phenomenological insight, better math models, adequate test equipment, and more ... |
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| Preparation for Testing a Full Scale OH-6A Rotor System with HHC installed |
JUN 95 |
89 pages |
| Authors:
Derle G. Hagwood Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In the 1970's and 198O's Hughes Helicopters, now McDonnell Douglas Helicopters, in conjunction with the U. S. Army and NASA developed and flight tested the first successful Higher Harmonic Control system for the purpose of reducing helicopter vibration levels. In addition to the reduced vibration levels interesting benefits were also noticed in the areas of acoustic signature and helicopter power requirements. For many years the reduced power requirements could not ... |
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| Electrical Characteristics and Thermal Analysis of a TOPAZ-II Single- Cell Thermionic Fuel Element Test Stand |
MAR 95 |
119 pages |
| Authors:
J. R. Venable; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The general objectives of this research are to investigate the electrical and thermal characteristics of the TOPAZ-ll thermionic fuel element (TFE) test stand which allows testing of a single TFE. Detailed cross sectional drawings have been developed and a one dimensional network has been created for use in a thermal model of the FTE test stand. Critical resistances in the network are identified as the regulated helium gap, the cesium ... |
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| Low Power Arcjet Performance Evaluation |
1995 |
13 pages |
| Authors:
Keith A. McFall; Dennis L. Tilley; Frank S. Gulczinski III; PHILLIPS LAB EDWARDS AFB CA
|
| The use of electric propulsion for stationkeeping and orbit repositioning missions offers significant' advantages to Air Force users. Commercial interest in electric propulsion has largely focused on geostationary north-south stationkeeping of high power communication satellites. and has resulted in the development and flight qualification of several thruster types operating in the 1500-2000 W power range. Since the power available for propulsion on many current and future Air Force satellites is ... |
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| Efficient Fault Diagnosis of Helicopter Gearboxes |
JUL 93 |
6 pages |
| Authors:
H. Chin; K. Danai; D. G. Lewicki; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
|
| Application of a diagnostic system to a helicopter gearbox is presented. The diagnostic system is a nonparametric pattern classifier that uses a multi-valued influence matrix (MVIM) as its diagnostic model and benefits from a fast learning algorithm that enables it to estimate its diagnostic model from a small number of measurement-fault data. To test this diagnostic system, vibration measurements were collected from a helicopter gearbox test stand during accelerated fatigue ... |
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| Control Vane Guidance for A Ducted-Fan Unmanned Air Vehicle |
JUN 93 |
112 pages |
| Authors:
Patrick J. Moran; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Control of airborne vehicles was originally conceived to be done entirely by human pilots. Improvements in electronics in the last 50 years have allowed many flight control functions to become automated, with the pilot continuously monitoring flight parameters from within the vehicle cockpit. With the advent of small unmanned air vehicles (UAV's) which are limited in size and weight-carrying capacity, a pilot is now able to fly an airborne vehicle ... |
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| Low-Noise, High-Strength, Spiral-Bevel Gears for Helicopter Transmissions |
JUN 93 |
15 pages |
| Authors:
David G. Lewicki; Robert F. Handschuh; Zachary S. Henry; Faydor L. Litvin; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
|
| Improvements in spiral-bevel gear design were investigated to support the Army/NASA Advanced Rotorcraft Transmission program. Program objectives were to reduce weight by 25 percent, reduce noise by 10 dB, and increase life to 5000 hr mean-time-between-removal. To help meet these goals, advanced-design spiral- bevel gears were tested in an OH-58D helicopter transmission using the NASA 500- hp Helicopter Transmission Test Stand. Three different gear designs tested included: (1) the current ... |
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| Parametric Study of a Finite Element Model of the Sidewinder Missile |
MAR 93 |
|
| Authors:
Gregory G. Van Dyke; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The long range Maritime Patrol mission has evolved and expanded such that the U. S. Navy's maritime patrol aircraft (P-3C Orion) has become an attractive platform from which to employ a wide variety of air launched weapons. Specifically the need for a stand alone air-to-air defensive capability was identified. In 1989 the Naval Air Test Center at Patuxent River, Maryland began investigations for this through the P-3C/AIM-9 integration program. Naval ... |
|
| 30 kA, 5000 V Solid-State Opening Switch for Inductive Energy Storage |
JAN 93 |
11 pages |
| Authors:
Mark W. Heyse; James B. Cornette; Nolan E. Taconi; Ed E. Bowles; W. G. Homeyer; GENERAL ATOMICS SAN DIEGO CA
|
| Inductive energy stores have demonstrated higher energy storage densities than capacitive energy stores. A limitation in the use of inductive energy stores has been the availability of adequately rated opening switches. A self-commutated solid-state switch has been developed for use as an opening device for an inductive energy store. A single switch module is rated at 30 kA and 5000 V. The charging pulse lengths for the intended application vary ... |
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| Development and Testing of the Digital Control System for the Archytas Unmanned Air Vehicle |
DEC 92 |
100 pages |
| Authors:
Paul V. Merz; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The purpose of this study was to develop the digital sampling and control system for an Unmanned Air Vehicle (UAV) designed to takeoff and land vertically and to transition to forward flight. The system is designed to operate from a personal computer through an umbilical cable tethered to the platform for hover tests. The computer controls the sampling and digital conversion of onboard analog sensor signals and sends control-surface commands ... |
|
| Theoretical and Experimental Investigation of Electron Beam Acceleration and Sub-Millimeter Wave Generation |
OCT 92 |
76 pages |
| Authors:
N. C. Luhmann Jr.; D. B. McDermott; CALIFORNIA UNIV LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The overall objective of our research for ARO is to develop devices that have the potential for being compact generators of submillimeter-wave radiation. (1) The high-harmonic gyro-frequency multiplier, which is an efficient generator of high frequency rf, will be tested at the tenth-harmonic in our rebuilt test-stand. (2) High-power harmonic gyro-TWTs can be designed to operate in high order modes in large size waveguide by using the marginal stability design ... |
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| Preliminary Development of a VTOL Unmanned Air Vehicle for the Close- Range Mission |
29 SEP 92 |
88 pages |
| Authors:
Gregory A. Kress; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The preliminary development of a full-scale Vertical Takeoff and Landing (VTOL) Unmanned Air Vehicle (UAV) for the Close-Range mission was completed at the Naval Postgraduate School (NPS). The vehicle was based on half- scale ducted-fan investigations performed at the UAV Flight Research Lab. The resulting design is a fixed-duct, tail-sitter UAV with a canard-configured horizontal stabilizer. Major airframe components are used from previous UAVs and include the wings from a ... |
|
| Full-Scale Transmission Testing to Evaluate Advanced Lubricants |
SEP 92 |
9 pages |
| Authors:
David G. Lewicki; Harry J. Decker; John T. Shimski; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
|
| Experimental tests were performed on the OH-58A helicopter main-rotor transmission in the NASA Lewis 500-hp helicopter transmission test stand. The testing was part of a joint Navy/ NASA/Army lubrication program. The objectives of the joint program are to develop and demonstrate a separate lubricant for gearboxes with improved performance in life and load-carrying capacity. The goal of these experiments was to develop a testing procedure to fail certain transmission components ... |
|
| Evaluation of an Oil-Debris Monitoring Device for Use in Helicopter Transmissions |
AUG 1992 |
20 pages |
| Authors:
David G. Lewicki; Donald M. Blanchette; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
|
| Experimental tests were performed on an OH-58A helicopter main-rotor transmission to evaluate an oil-debris monitoring device (ODMD). The tests were performed in the NASA 500-hp Helicopter Transmission Test Stand. Five endurance tests were run as part of a U.S. Navy/NASA/Army advanced lubricants program. The tests were run at 100-percent design speed, 117-percent design torque, and 121 deg C (250 deg F) oil inlet temperature. Each test lasted between 29 and ... |
|
| Multimegawatt Quasi-Steady MPD Thruster Facility |
JUL 1992 |
9 pages |
| Authors:
S. Castillo; D. Tilley; PHILLIPS LAB EDWARDS AFB CA
|
| The multi-megawatt, quasi-steady MPD thruster facility at the Air Force Phillips Laboratory is now fully operational. This operational status is the result of many modifications and improvements completed in the past year. An update of facility capabilities and operation is presented. In particular the vacuum, propellant, and electrical systems are described, followed by a description of an impulse thrust stand and diagnostics capabilities. Finally, preliminary NPD thruster test results are ... |
|
| 25 kA, 5000V Solid State Opening Switch for Inductive Energy Stores |
JUL 92 |
11 pages |
| Authors:
Mark W. Heyse; James B. Cornette; Nolan E. Taconi; E. Bowles; W. G. Homeyer; GENERAL ATOMICS SAN DIEGO CA
|
| A self-commutated solid state switch has been developed for use as an opening device for an inductive energy store. 25 kA, 5000 V operation has been obtained in a compact switch module. The switch topology is a two-stage hybrid consisting of an SCR-FET / SCR-IGBT combination. The switch is designed to charge an inductive energy store and repetitively commutate the current to a dynamic load. A 25 kA switch module ... |
|
| Noise Studies for Environmental Impact Assessment of an Outdoor Engine Test Facility, |
APR 1992 |
|
| Authors:
G. Krishnappa; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF MECHANICAL ENGINE ERING
|
| The potential impact of noise in the community surrounding a proposed outdoor test facility in the Ottawa area was evaluated. The test stand was planned for the testing of high performance gas turbine engines. Theoretical predictions based on the outdoor sound propagation model were made for the noise generated from a General Electric F404 engine. The results were verified by carrying out measurements of noise generated from a single engine ... |
|
| Experimental Testing of Prototype Face Gears for Helicopter Transmissions |
92 |
16 pages |
| Authors:
R. Handschuh; D. Lewicki; R. Bossler; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC
|
| An experimental program to test the feasibility of using face gears in a high-speed and high-power environment was conducted. Four face gear sets were tested, two sets at a time, in a closed-loop test stand at pinion rotational speeds to 19,100 rpm and to 271 kW (364 hp). The test gear sets were one-half scale of the helicopter design gear set. Testing the gears at one- eighth power, the test ... |
|
| Qualification Test Report. Fuel Pump Test Stand. 3C3965G05 |
OCT 91 |
113 pages |
| Authors:
J. E. Moss; GENERAL ELECTRIC CO CINCINNATI OH AIRCRAFT ENGINE BUSINESS GROUP
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| The purpose of this report is to summarize the results of the Qualification Testing performed one the 3C3965G05 Fuel Pump Test Stand at Tinker Air Force Base. The 3c3965G05 Fuel Pump Test Stand was designed for the USAF by General Electric Aircraft Engines, Cincinnati, Ohio. It was designed to test the F101-GE-102, F110-GE-100, F108-CF-100, F118-GE-100, and F110-GE-129 fuel pumps and subassemblies. The objective of the testing program was to qualify ... |
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| Dynamic Modeling and Modal Analysis of an Air-to-Air Missile |
SEP 91 |
111 pages |
| Authors:
Michael A. Shutty; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The P-3 Orion patrol airplane has a need for an air-to-air missile system for defense against enemy aircraft on its long-range missions. In response to this need, the Naval Air Test Center was tasked in 1989 to conduct a P-3/AIM-9 (Sidewinder) integration program. In support of this program, a vibration test stand was established at NPS, and a ground vibration characterization was conducted to determine if a potential flutter problem ... |
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| Bimonthly Report Number 10 Detailing Work Done on Contract N00014-89-C- 2238 during June and July 1991 (Micrion Corporation) |
07 AUG 91 |
5 pages |
| Authors:
MICRION CORP PEABODY MA
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| The production prototype column was installed on the column test stand. This is different than the original test stand in that it is the stand used to test production ready columns with production software and electronics, as well as testing column stability over time. The new electronics and operating system designed for the 0.25 um system were successfully linked to the column. The performance of the column is excellent: we ... |
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