450
450
Jul 11, 2010
07/10
by
ARISTOVSKAYA, T. V
texts
eye 450
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A REVIEW, WITH 30 REFERENCES, DISCUSSING CLAY MINERALS AND ORGANIC MATTER DECOMPOSITION AND TRANSFORMATION BY SOIL MICROORGANISMS WERE PRESENTED. THE EFFECT OF HYDROTHERMAL AND OTHER FACTORS ON THIS MICROBIAL ACTIVITY, AND THE EFFECT OF MICROBIAL ACTIVITY ON CHEMICAL PROCESSES IN SOIL AND ON SOIL FORMATION WAS INCLUDED.
Topics: RADAR EQUIPMENT, RADAR RECEIVERS, RADAR TRANSMITTERS, SUPERHIGH FREQUENCIES, ULTRAHIGH FREQUENCIES,...
452
452
May 22, 2011
05/11
by
Abshire, James B.; Mcgarry, Jan F.; Pacini, Linda K.; Blair, J. Bryan; Elman, Gregory C
texts
eye 452
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A numerical simulator of a pulsed, direct detection laser altimeter has been developed to investigate the performance of space-based laser altimeters operating over surfaces with various height profiles. The simulator calculates the laser's optical intensity waveform as it propagates to and is reflected from the terrain surface and is collected by the receiver telescope. It also calculates the signal and noise waveforms output from the receiver's optical detector and waveform digitizer. Both...
Topics: BONDED JOINTS, NOZZLE DESIGN, POSTFLIGHT ANALYSIS, SOLID PROPELLANT ROCKET ENGINES, ASSEMBLING,...
138
138
Jun 2, 2011
06/11
by
Ackerman, Andre
texts
eye 138
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The effects of aerosols on cloud albedos contributes the single greatest uncertainty in estimates of global radiative forcing since preindustrial times. A dramatic example of these effects is provided by ship tracks, which are long, linear regions of enhanced cloud reflectivity that sometimes form downwind of ships. Previously, ship tracks and a number of other topics in the area of aerosol-cloud interactions have been investigated with a one-dimensional numerical model, which is composed of...
Topics: SHARP LEADING EDGES, REENTRY VEHICLES, DRAG, FLIGHT TESTS, NOSE TIPS, THERMOCOUPLES
240
240
Jun 21, 2010
06/10
by
Adams, J. J
texts
eye 240
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Mathematical model of pilot response including time varying gains and random noise signals
Topics: AIRCRAFT PERFORMANCE, LININGS, NOISE REDUCTION, BOEING 707 AIRCRAFT, NACELLES, TURBOFAN ENGINES,...
211
211
Jun 21, 2010
06/10
by
Adams, R. R.; Foelsche, T.; Mendell, R.; Wilson, J. W
texts
eye 211
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No Abstract Available
Topics: FLIGHT TESTS, PROPULSION SYSTEM PERFORMANCE, SATURN S-4B STAGE, APOLLO PROJECT, APOLLO 6 FLIGHT
175
175
Jul 11, 2010
07/10
by
Alexander, R. H.; Fitzpatrick, K.; Lins, H. F., Jr.; Mcginty, H. K., II
texts
eye 175
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Data from high altitude aircraft, LANDSAT and Skylab were used in a comprehensive regional survey of land use and its associated environmental impact in the Central Atlantic Regional Ecological Test Site (CARETS). Each sensor system has advantages that were demonstrated by producing experimental land use maps and other data products, applying them to typical problems encountered in regional planning and environmental impact assessment, and presenting the results to prospective users for...
Topics: DESIGN ANALYSIS, RESEARCH AIRCRAFT, DIGITAL TECHNIQUES, F-8 AIRCRAFT, FLY BY WIRE CONTROL,...
379
379
Jul 23, 2010
07/10
by
Alikiotis, Dimitr
texts
eye 379
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The integrated avionics reliability task is an effort to build credible reliability and/or performability models for multisensor integrated navigation and flight control. The research was initiated by the reliability analysis of a multisensor navigation system consisting of the Global Positioning System (GPS), the Long Range Navigation system (Loran C), and an inertial measurement unit (IMU). Markov reliability models were developed based on system failure rates and mission time.
Topics: BRANCHING (MATHEMATICS), FLIGHT CHARACTERISTICS, FLIGHT TESTS, UNSTEADY AERODYNAMICS, DYNAMIC...
547
547
Jul 11, 2010
07/10
by
Allan, R. D.; Joy, W
texts
eye 547
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An evaluation of various advanced propulsion concepts for supersonic cruise aircraft resulted in the identification of the double-bypass variable cycle engine as the most promising concept. This engine design utilizes special variable geometry components and an annular exhaust nozzle to provide high take-off thrust and low jet noise. The engine also provides good performance at both supersonic cruise and subsonic cruise. Emission characteristics are excellent. The advanced technology...
Topics: DELTA WINGS, HYPERSONIC HEAT TRANSFER, LAMINAR BOUNDARY LAYER, PRESSURE, TURBULENT BOUNDARY LAYER,...
1,199
1.2K
Jul 12, 2010
07/10
by
Allaway, H
texts
eye 1,199
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The concept of the orbital flight of the space shuttle and the development of the space transportation system are addressed. How the system came to be, why it is designed the way it is, what is expected of it, and how it may grow are among the questions considered. Emphasis is placed on the effect of the space transportation system on U.S. space exploration in the next decade, including plans to make space an extension of life on the Earth's surface.
Topics: AIRSPEED, SUPERSONIC SPEED, AUTOMATIC PILOTS, FLIGHT CONTROL, FLIGHT TESTS, MACH NUMBER, YF-12...
373
373
Jun 12, 2011
06/11
by
Anderson, Robert C.; Buehler, M.; Seshadri, S.; Kuhlman, G.; Schaap, M
texts
eye 373
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The return to the Moon has ignited the need to characterize the lunar regolith using fast, reliable in-situ methods. Characterizing the physical properties of the rocks and soils can be very difficult because of the many complex parameters that influence the measurements. In particular, soil electrical property measurements are influenced by temperature, mineral type, grain size, porosity, and soil conductivity. Determining the dielectric constant of lunar materials may be very important in...
Topics: FLIGHT TESTS, REAL TIME OPERATION, RUNWAYS, SITUATIONAL AWARENESS, VISUAL PERCEPTION, SYSTEMS...
604
604
Jun 20, 2010
06/10
by
Anoshchenko, N. D
texts
eye 604
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History of ramjet engine design, development, and flight testing in Russia through 1944
Topics: FLIGHT TESTS, HISTORIES, RAMJET ENGINES, ENGINE DESIGN, GROUND TESTS, JET ENGINES, ROCKET ENGINES,...
462
462
Jun 20, 2010
06/10
by
Anoshchenko, N. D
texts
eye 462
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comment 0
Rocket engine technology, rocket planes, rocket propelled gliders, and seaplanes - history
Topics: GLIDERS, HISTORIES, ROCKET ENGINES, ROCKET PLANES, SEAPLANES, FLIGHT TESTS, GRAVITATION
293
293
Jul 11, 2010
07/10
by
Anstead, R. J
texts
eye 293
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A dissertation is given on the final preseal visual inspection of microcircuit devices to detect manufacturing defects and reduce failure rates in service. The processes employed in fabricating monolithic integrated circuits and hybrid microcircuits, various failure mechanisms resulting from deficiencies in those processes, and the rudiments of performing final inspection are outlined.
Topics: GERT, SPACE MECHANICS, SPACE NAVIGATION, FLIGHT TESTS, NOMOGRAPHS, ORBITAL MECHANICS, PROBLEM...
328
328
May 6, 2010
05/10
by
Arbic, R. G
texts
eye 328
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comment 0
Free flight test of tailless missile configuration with 45-deg sweptback wing of aspect ratio 4 - stability at transonic speeds
Topics: AERODYNAMIC STABILITY, TRANSONIC SPEED, AERODYNAMIC STABILITY, MISSILE CONFIGURATION, SWEPTBACK...
239
239
May 29, 2011
05/11
by
Arepalli, Sivaram; Nikolaev, Pavel; Holmes, William; Scott, Carl D
texts
eye 239
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This paper presents diagnostic data obtained from the plume of a graphite composite target during carbon nanotube production by the double-pulse laser oven method. The insitu emission spectrum (300 to 650 nm) is recorded at different locations upstream of the target and at different delay times from the lasers (IR and green). Spectral features are identified as emissions from C2 (Swan System: a (sup 3)pi(sub g) - delta (sup 3)pi(sub u) and C3 (Comet Head System: A (sup 1)pi(sub u) - chi (sup...
Topics: EXPERIMENT DESIGN, FLIGHT CHARACTERISTICS, FEEDBACK CONTROL, DYNAMIC MODELS, SYSTEM IDENTIFICATION,...
276
276
May 29, 2011
05/11
by
Asenov, Asen; Slavcheva, G.; Brown, A. R.; Davies, J. H.; Saini, S
texts
eye 276
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In this paper we present a detailed simulation study of the influence of quantum mechanical effects in the inversion layer on random dopant induced threshold voltage fluctuations and lowering in sub 100 nm MOSFETs. The simulations have been performed using a 3-D implementation of the density gradient (DG) formalism incorporated in our established 3-D atomistic simulation approach. This results in a self-consistent 3-D quantum mechanical picture, which implies not only the vertical inversion...
Topics: X-38 CREW RETURN VEHICLE, COMFORT, EMERGENCIES, ENGINEERS, PARABOLAS, RESCUE OPERATIONS,...
246
246
Jul 11, 2010
07/10
by
BOGACHEV, I. N.; DYAKOVA, M. A.; BEZRUKOVA, A. K.; SELITSKAYA, S. I
texts
eye 246
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DECOMPOSITION OF THE BETA-SOLID SOLUTION OCCURS AND DEFORMATION MARTENSITE IS FORMED IN TITANIUM ALLOYS WITH AN UNSTABLE BETA-SOLID SOLUTION AT NEGATIVE TEMPERATURES FROM -40 DEG TO -120 DEG. PRELIMINARY PLASTIC DEFORMATION BY EXPANSION (4%) AT NEGATIVE TEMPERATURES OF ALLOYS WITH AN UNSTABLE BETA-SOLID SOLUTION REDUCES THE INTENSITY OF DEFORMATION MARTENSITE AND CAUSES A SMALLER INCREASE OF STRENGTH PROPERTIES THAN COLD TREATMENT. SMALL PRELIMINARY PLASTIC DEFORMATION OF AN ALLOY WITH A MORE...
Topics: C-5 AIRCRAFT, FLOW DISTRIBUTION, NEWTON-RAPHSON METHOD, TURBULENT WAKES, VORTEX SHEETS, AERODYNAMIC...
286
286
Jun 21, 2010
06/10
by
Baber, H. T., Jr.; Moul, M. T
texts
eye 286
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comment 0
No Abstract Available
Topics: AIRCRAFT CONFIGURATIONS, DRAG MEASUREMENT, TRANSONIC FLIGHT, FLIGHT TESTS, ROCKET FLIGHT, TRANSONIC...
206
206
May 29, 2011
05/11
by
Bacmeister, Julio; Pegion, Philip J.; Schubert, Siegfried D
texts
eye 206
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This atlas documents the climate characteristics of version 1 of the NASA Seasonal-to-Interannual Prediction Project (NSIPP) Atmospheric General Circulation Model (AGCM). The AGCM includes an interactive land model (the Mosaic scheme), and is part of the NSIPP coupled atmosphere-land-ocean model. The results presented here are based on a 20-year (December 1979-November 1999) ''ANIIP-style'' integration of the AGCM in which the monthly-mean sea-surface temperature and sea ice are specified from...
Topics: MARS PATHFINDER, NASA SPACE PROGRAMS, X-34 REUSABLE LAUNCH VEHICLE, X-37 VEHICLE, FLIGHT TESTS,...
235
235
Jun 13, 2011
06/11
by
Baker, Joh
texts
eye 235
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comment 0
A viewgraph presentation on the simulation of gravitational waves from Binary Massive Black Holes with LISA observations is shown. The topics include: 1) Massive Black Holes (MBHs); 2) MBH Binaries; 3) Gravitational Wavws from MBH Binaries; 4) Observing with LISA; 5) How LISA sees MBH binary mergers; 6) MBH binary inspirals to LISA; 7) Numerical Relativity Simulations; 8) Numerical Relativity Challenges; 9) Recent Successes; 10) Goddard Team; 11) Binary Black Hole Simulations at Goddard; 12)...
Topics: NONLINEAR SYSTEMS, AEROELASTIC RESEARCH WINGS, POLYNOMIALS, SIMULATION, F-18 AIRCRAFT,...
456
456
Jul 26, 2010
07/10
by
Baker, Karl W.; Dustin, Miles O.; Crane, Roge
texts
eye 456
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An advanced heat pipe receiver designed for a solar dynamic space power system is described. The power system consists of a solar concentrator, solar heat receiver, Stirling heat engine, linear alternator and waste heat radiator. The solar concentrator focuses the sun's energy into a heat receiver. The engine and alternator convert a portion of this energy to electric power and the remaining heat is rejected by a waste heat radiator. Primary liquid metal heat pipes transport heat energy to the...
Topics: ATMOSPHERIC CIRCULATION, CORRECTION, FLIGHT TESTS, JIMSPHERE BALLOONS, KALMAN FILTERS, MACH NUMBER,...
226
226
May 27, 2011
05/11
by
Bandettini, Angelo; Isler, Walter E
texts
eye 226
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Wind-tunnel tests have been made to determine the location of the boundary-layer transition on three hemispheres having surface roughness (absolute) values of 50, 580, and 2760 microinches. After the initial test run of the smoothest (50 microinch) hemisphere, holes ranging in depth from 1500 to 2500 microinches were noticed in the meridian where transition was observed. The holes were believed to be caused by particles in the air stream. Shadowgraph pictures were obtained of all hemispheres...
Topics: AERODYNAMIC LOADS, FREQUENCY RESPONSE, SWEPT WINGS, FLIGHT TESTS, DEFORMATION, ANALYSIS...
373
373
May 26, 2011
05/11
by
Bangham, M. E.; Lorenzini, E.; Vestal, L
texts
eye 373
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The projected traffic to geostationary earth orbit (GEO) is expected to increase over the next few decades. At the same time, the cost of delivering payloads from the Earth's surface to low earth orbit (LEO) is projected to decrease, thanks in part to the Reusable Launch Vehicle (RLV). A comparable reduction in the cost of delivering payloads from LEO to GEO is sought. The use of in-space tethers, eliminating the requirement for traditional chemical upper stages and thereby reducing the launch...
Topics: REMOTELY PILOTED VEHICLES, RESEARCH VEHICLES, PRODUCT DEVELOPMENT, FLIGHT TESTS, HIGHLY...
282
282
Jun 13, 2011
06/11
by
Barbier, Louis M
texts
eye 282
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This paper will give an overview of the NASA Universe Division Beyond Einstein program. The Beyond Einstein program consists of a series of exploratory missions to investigate some of the most important and pressing problems in modern-day astrophysics - including searches for Dark Energy and studies of the earliest times in the universe, during the inflationary period after the Big Bang. A variety of new technologies are being developed both in the science instrumentation these missions will...
Topics: RESEARCH AND DEVELOPMENT, EAR PROTECTORS, FLIGHT TESTS, ACCIDENT INVESTIGATION, ACTIVE CONTROL,...
202
202
Jun 9, 2011
06/11
by
Barrett, Michael J.; Reid, Bryan M
texts
eye 202
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State-of-the-art closed-Brayton-cycle (CBC) space power systems were modeled to study performance trends in a trade space characteristic of interplanetary orbiters. For working-fluid molar masses of 48.6, 39.9, and 11.9 kg/kmol, peak system pressures of 1.38 and 3.0 MPa and compressor pressure ratios ranging from 1.6 to 2.4, total system masses were estimated. System mass increased as peak operating pressure increased for all compressor pressure ratios and molar mass values examined. Minimum...
Topics: RESEARCH AND DEVELOPMENT, ACTUATORS, X-37 VEHICLE, FLIGHT CONTROL, NEURAL NETS, AIR TO AIR...
297
297
May 29, 2011
05/11
by
Barry, R. K.; Kuhn, J., et al; Satyapal, S.; Greenhouse, M. A.; Barclay, R.; Amato, D.; Arritt, B.; Brown, G.; Harvey, V.; Holt, C.
texts
eye 297
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We discuss work in progress on a near-infrared tunable bandpass filter for the Goddard baseline wide field camera concept of the Next Generation Space Telescope (NGST) Integrated Science Instrument Module (ISIM). This filter, the Demonstration Unit for Low Order Cryogenic Etalon (DULCE), is designed to demonstrate a high efficiency scanning Fabry-Perot etalon operating in interference orders 1 - 4 at 30K with a high stability DSP based servo control system. DULCE is currently the only available...
Topics: QUALITATIVE ANALYSIS, CONTROLLABILITY, CONTROLLERS, COOPER-HARPER RATINGS, FLIGHT CONTROL,...
209
209
May 21, 2011
05/11
by
Bassom, Andrew P.; Hall, Phili
texts
eye 209
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In this paper, we make an investigation of the receptivity of boundary layer flows to Gortler vortex modes. A study by Denier, Hall, and Seddougui (1991) of the generation of vortices by wall roughness elements concluded that such elements are extremely poor as mechanisms to stimulate short wavelength modes, but that analysis was in error. We re-examine this problem and demonstrate how the form of the wall roughness is crucial in determining the vortex stability characteristics downstream of...
Topics: AEROSPACE PLANES, MEASURING INSTRUMENTS, NATIONAL AEROSPACE PLANE PROGRAM, SPACECRAFT INSTRUMENTS,...
513
513
Jun 21, 2010
06/10
by
Batterson, S. A.; Gunn, J. E.; Hagemeyer, W. A.; Jaffe, L. D.; Jones, R. H.; Livingston, W. C.; Lucas, J. W.; Morris, E. C.; Newkirk, G. A.; Norton, R. H.; Rennilson, J. J.; Benson, H. E.; Saari, J. M.; Scott, R. F; Brown, W. E.; Chandler, C. E.; Christensen, E. M.; Conel, J. E.; Dragg, J. L.; Dwornik, S. E.; Garipay, R. R.
texts
eye 513
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Lunar data and results of Surveyor 1 lunar probe
Topics: AIRCRAFT PERFORMANCE, BREGUET 941 AIRCRAFT, FLIGHT TESTS, INSTRUMENT FLIGHT RULES, SHORT TAKEOFF...
319
319
Jul 11, 2010
07/10
by
Batterton, P. G.; Arpasi, D. J.; Baumbick, R. J
texts
eye 319
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A digitally implemented integrated inlet/engine control system was developed and tested on a mixed compression, Mach 2.5, supersonic inlet and augmented turbofan engine. The control matched engine airflow to available inlet airflow so that in steady state, the shock would be at the desired location, and the overboard bypass doors would be closed. During engine induced transients, such as augmentor lights and cutoffs, the inlet operating point was momentarily changed to a more supercritical...
Topics: ANALOG TO DIGITAL CONVERTERS, BACKUPS, F-8 AIRCRAFT, FLY BY WIRE CONTROL, AIRBORNE/SPACEBORNE...
227
227
May 31, 2011
05/11
by
Bell, Jeffrey A.; VanRoey, Patric
texts
eye 227
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This is the final report on a NASA Grant. It concerns a description of work done, which includes: (1) Protein crystals cross-linked to form fibers; (2) Engineering of protein to favor crystallization; (3) Better knowledge-based potentials for protein-protein contacts; (4) Simulation of protein crystallization.
Topics: REMOTELY PILOTED VEHICLES, DESIGN ANALYSIS, FABRICATION, FLIGHT TESTS, TERRAIN, FLEXIBLE WINGS,...
227
227
May 31, 2011
05/11
by
Bernstein Max P.; Sandford, Scott A.; Allamandola, Louis J
texts
eye 227
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There is a growing concensus among space scientists that frozen molecules from space helped to make the Earth the pleasant place that it is today, and helped Life start on Earth, and perhaps elsewhere. The chain of logic that led scientists to posit a connection between extraterrestrial molecules and the origin of life is as follows. 1) The rapidity with which life arose demands that conditions on Earth were conducive to the formation of life very early on. 2) There is reason to believe that...
Topics: ROTARY WING AIRCRAFT, MILITARY AVIATION, AIRCRAFT DESIGN, AIRCRAFT RELIABILITY, LOADING,...
865
865
Jul 21, 2010
07/10
by
Berry, Fred A., Jr
texts
eye 865
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comment 0
A Commodore VIC-20 computer has been interfaced with a stepper motor to provide an inexpensive stepper motor controller. Only eight transistors and two integrated circuits compose the interface. The software controls the parallel interface of the computer and provides the four phase drive signals for the motor. Optical sensors control the zeroing of the 12-inch turntable positioned by the controller. The computer calculates the position information and movement of the table and may be...
Topics: APPLICATIONS PROGRAMS (COMPUTERS), DATA MANAGEMENT, DATA PROCESSING, FLIGHT TESTS, FORTRAN, GRAPHS...
596
596
May 23, 2011
05/11
by
Bhardwaj, Manoj K
texts
eye 596
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With advanced subsonic transports and military aircraft operating in the transonic regime, it is becoming important to determine the effects of the coupling between aerodynamic loads and elastic forces. Since aeroelastic effects can contribute significantly to the design of these aircraft, there is a strong need in the aerospace industry to predict these aero-structure interactions computationally. To perform static aeroelastic analysis in the transonic regime, high fidelity computational fluid...
Topics: STRESS ANALYSIS, ESTIMATING, TEST VEHICLES, LOADS (FORCES), LIFTING BODIES, PYLONS, HOOKS, DROP...
353
353
Jun 17, 2010
06/10
by
Biesiadny, T. J.; Coltrin, R. J.; Livingood, J. N. B.; Powers, A. G.; Rudey, R. A.; Straight, D. M
texts
eye 353
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Nuclear reactor simulator test - liquid hydrogen run, instrumentation and data acquisition system operational procedure checkout
Topics: CHECKOUT, DATA ACQUISITION, FLIGHT TEST, INSTRUMENTATION, LIQUID HYDROGEN, REACTOR, SIMULATOR, DATA...
247
247
Jul 26, 2010
07/10
by
Bigelow, C. A.; Naik, R. A
texts
eye 247
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A macro-micromechanics analysis was formulated to determine the matrix and fiber behavior near the notch tip in a center-notched metal matrix composite. Results are presented for a boron/aluminum monolayer. The macro-level analysis models the entire notched specimen using a three dimensional finite element program which uses the vanishing-fiber-diameter model to model the elastic-plastic behavior of the matrix and the elastic behavior of the fiber. The micro-behavior is analyzed using a...
Topics: APOLLO 7 FLIGHT, POSTFLIGHT ANALYSIS, SATURN 1B LAUNCH VEHICLES, SPACECRAFT LAUNCHING, SPACECRAFT...
233
233
Jul 11, 2010
07/10
by
Billig, L. O.; Kniat, J.; Schmidt, R. D
texts
eye 233
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The Integrated Propulsion Control System (IPCS) demonstrates control of an entire supersonic propulsion module - inlet, engine afterburner, and nozzle - with an HDC 601 digital computer. The program encompasses the design, build, qualification, and flight testing of control modes, software, and hardware. The flight test vehicle is an F-111E airplane. The L.H. inlet and engine will be operated under control of a digital computer mounted in the weapons bay. A general description and the current...
Topics: AIRCRAFT CONTROL, DIGITAL TECHNIQUES, FLY BY WIRE CONTROL, TECHNOLOGY ASSESSMENT, AVIONICS, F-8...
239
239
Jul 11, 2010
07/10
by
Bird, D. K.; Neighbor, T. L
texts
eye 239
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The advanced control technology is considered that is necessary to cope with the medium STOL transport landing problem and, in particular, the necessity to decouple with active control techniques. It is shown that the need to decouple is independent of the powered lift concept but that the provisioning for decoupling is most greatly dependent on the preassumed piloting technique. The implications of decoupling and active control techniques with respect to pilot technique options, handling...
Topics: FLIGHT TESTS, FLY BY WIRE CONTROL, MILITARY AIRCRAFT, AVIONICS, F-4 AIRCRAFT, FLIGHT CONTROL,...
221
221
Sep 20, 2010
09/10
by
Bischoff, L.; Dressler, B. O.; Avermann, M. E.; Brockmeyer, P.; Lakomy, R.; Mueller-Mohr, V
texts
eye 221
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In cooperation between the Ontario Geological Survey and the Institute of Geology and Institute of Planetology, geological, petrological, and geochemical studies were carried out on impact-related phenomena of the Sudbury structure during the last decade. The main results of the field studies are briefly reviewed. Footwall rocks, sublayer, and lower sections of the Sudbury Igneous Complex (SIC) were mainly mapped and sampled in the northern (Levack Township) and western (Trillabelle and Sultana...
Topics: APOLLO PROJECT, PROPULSION SYSTEM PERFORMANCE, SKYLAB 4, THERMAL ENVIRONMENTS, POSTFLIGHT ANALYSIS,...
332
332
May 21, 2011
05/11
by
Bjorkman, Rey C.; Lindstrom, Robert E; Bown, Charles W.; Smith, Scott D.; Walters, Jerry L.; Kulkarni, Suresh B.; Cook, Roger V.; Sebahar, David A.; Walker, Craig S.; Haddock, M. Reed
texts
eye 332
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This report documents the results of the investigation into causes of gas paths on the 20A and 20B case-to-nozzle joints on STS-42. The investigation was conducted by the Investigation Board appointed by the senior vice president and general manager of Space Operations, Mr. R. E. Lindstrom, on 7 Feb. 1992. The probability of gas path occurrence in the nozzle-to-case-joint polysulfide had been identified during joint redesign. However, actual flight gas path incidence has been limited to RSRM-11...
Topics: AIRCRAFT ENGINES, NOISE PREDICTION (AIRCRAFT), PRESSURE RATIO, EXHAUST GASES, EXHAUST NOZZLES, F-18...
224
224
Jun 20, 2010
06/10
by
Blanchard, W. S., Jr.; Hoffman, S
texts
eye 224
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Full-scale model flight testing of abort-escape system for manned space capsule used in case of booster rocket malfunction at or near takeoff
Topics: FLIGHT TESTS, TOWED BODIES, FLIGHT TEST, LAUNCH ESCAPE SYSTEM /LES/, MANNED SPACE FLIGHT, SCALE...
290
290
Jun 20, 2010
06/10
by
Blanchard, W. S., Jr.; Raper, J. L
texts
eye 290
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Full-scale flight test from sea level of abort- escape system for manned Mercury capsule
Topics: ABORT APPARATUS, ABORT APPARATUS, ESCAPE CAPSULE, FLIGHT TEST, MERCURY CAPSULE, ESCAPE CAPSULES,...
265
265
Jul 5, 2010
07/10
by
Bobbitt, P. J.; Carlson, H. W.; Pearson, A. O
texts
eye 265
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comment 0
No Abstract Available
Topics: AIRCRAFT FUEL SYSTEMS, FLIGHT TESTS, LIQUID HYDROGEN, TURBINE ENGINES, HEAT EXCHANGERS, JET...
273
273
Jun 18, 2010
06/10
by
Boisseau, P. C.; Paulson, J. W
texts
eye 273
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Low-speed free flight tunnel testing of swept wing fighter aircraft for determining effect of small canard surfaces on directional stability
Topics: CANARD CONFIGURATIONS, CANARD, DIRECTIONAL STABILITY, FIGHTER AIRCRAFT, FREE FLIGHT, LOW SPEED WIND...
243
243
Jul 11, 2010
07/10
by
Boone, J. H.; Flynn, G. R
texts
eye 243
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A trade study was conducted with the objective of providing a technical guideline for selection of the most appropriate computer technology for the automatic flight control system of a civil subsonic jet transport. The trade study considers aspects of using either an analog, incremental type special purpose computer or a general purpose computer to perform critical autopilot computation functions. It also considers aspects of integration of noncritical autopilot and autothrottle modes into the...
Topics: DIGITAL SYSTEMS, F-8 AIRCRAFT, FLIGHT TESTS, FLY BY WIRE CONTROL, TECHNOLOGY ASSESSMENT,...
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260
Sep 20, 2010
09/10
by
Booth, Charles R.; Mitchell, B. Greg; Holm-Hansen, O
texts
eye 260
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Biospherical Instruments has successfully completed a NASA sponsored SBIR (Small Business Innovational Research Program) project to develop spectroradiometers capable of being deployed in the ocean for long periods of time. The completion of this project adds a valuable tool for the calibration of future spaceborne ocean color sensors and enables oceanographers to extend remote sensing optical techniques beyond the intermittent coverage of spaceborne sensors. Highlights of the project include...
Topics: ADAPTIVE CONTROL, GROUND TESTS, KALMAN FILTERS, TRENDS, AIRCRAFT PERFORMANCE, ENGINE CONTROL,...
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May 31, 2011
05/11
by
Booth, Earl R., Jr.; Wilbur, Matthew L
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The use of an Active Twist Rotor system to provide both vibration reduction and performance enhancement has been explored in recent analytical and experimental studies. Effects of active-twist control on rotor noise, however, had not been determined. During a recent wind tunnel test of an active-twist rotor system, a set of acoustic measurements were obtained to assess the effects of active-twist control on noise produced by the rotor, especially blade-vortex interaction (BVI) noise. It was...
Topics: REUSABLE LAUNCH VEHICLES, X-33 REUSABLE LAUNCH VEHICLE, AEROSPACE SAFETY, MONTE CARLO METHOD,...
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Jun 21, 2010
06/10
by
Boswinkle, R. W., Jr
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Noise reduction levels and increased operating costs of DC 8 and Boeing 707 aircraft retrofitted with acoustically treated nacelles
Topics: AIRCRAFT PERFORMANCE, JET AIRCRAFT NOISE, NOISE REDUCTION, DC 8 AIRCRAFT, FLIGHT TESTS, NACELLES,...
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Jun 12, 2011
06/11
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Bowman, Cheryl L.; Ritzert, Frank J.; Smialek, James L.; Jaster, Mark L.; rker, Samuel P
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Proposed concepts for an ambitious mission to explore Jupiter's three icy moons place significant demands on the various spacecraft systems. There are many challenges related to the high output power conversion systems being considered, and one example is the need to ensure system compatibility at all levels. The utilization of appropriate materials for component structures is important to ensuring long mission life. Refractory metal alloys have attractive high-temperature properties in inert...
Topics: FLIGHT TESTS, SYSTEMS INTEGRATION, ENHANCED VISION, PREVENTION, COMMERCIAL AIRCRAFT, AIRPORTS,...
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May 27, 2011
05/11
by
Bowman, James S., Jr.; Healy, Frederick M
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A flutter analysis employing the kernel function for three- dimensional, subsonic, compressible flow is applied to a flutter-tested tail surface which has an aspect ratio of 3.5, a taper ratio of 0.15, and a leading-edge sweep of 30 deg. Theoretical and experimental results are compared at Mach numbers from 0.75 to 0.98. Good agreement between theoretical and experimental flutter dynamic pressures and frequencies is achieved at Mach numbers to 0.92. At Mach numbers from 0.92 to 0.98, however, a...
Topics: FLIGHT TESTS, RANDOM PROCESSES, SWEPT WINGS, ERRORS, SAMPLING, RELIABILITY, DISTORTION, FREQUENCY...
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May 28, 2011
05/11
by
Branly, Rolando; Ritter, Joe; Friedfeld, Robert; Ackerman, Eric; Carruthers, Carl; Faranda, Jo
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The G-781 Terrestrial and Atmospheric Multi-Spectral Explorer payload (TAMSE) is the result of an educational partnership between Broward and Brevard Community Colleges with the Association of Small Payload Researchers (ASPR) and the Florida Space Institute, University of Central Florida. The effort focuses on flying nine experiments, including three earth viewing remote sensing experiments, three microgravity experiments involving crystal growth, and three radiation measurement experiments....
Topics: FLIGHT TESTS, CONTROL THEORY, EMERGENCIES, ENGINE INLETS, F-15 AIRCRAFT, FLIGHT PATHS, GUSTS,...
