434
434
Jun 12, 2011
06/11
by
Dennis, Nige
texts
eye 434
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In the current downturn in demand for air travel, major airlines are revising and rationalizing their networks in an attempt to improve financial performance and strengthen their defences against both new entrants and traditional rivals. Expansion of commercial agreements or alliances with other airlines has become a key reaction to the increasingly competitive marketplace. In the absence, for regulatory reasons, of cross-border mergers these are the principal means by which the industry can...
Topics: AUTONOMY, ARTIFICIAL INTELLIGENCE, SPACECRAFT CONTROL, SPACE EXPLORATION
227
227
May 22, 2011
05/11
by
Nash-Stevenson, S. K.; Reddy, B. R.; Venkateswarlu, P
texts
eye 227
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A summary is presented of the spectroscopic study of three systems: LaF3:Ho(3), LaF3:Er(3) and CaF2:Nd(3). When the D levels of Ho(3) in LaF3 were resonantly excited with a laser beam of 640 nm, upconverted emissions were detected from J (416 nm), F (485 nm), and E (546 nm) levels. Energy upconverted emissions were also observed from F and E levels of Ho(3) when the material was excited with an 800 nm near infrared laser. When the D levels of Er(3) in LaF3 were resonantly excited with a laser...
Topics: SCHEDULES, SPACECRAFT CONTROL, TELEMETRY, PAYLOADS, PROTOTYPES, WORKSTATIONS
365
365
Jun 20, 2010
06/10
by
NON
texts
eye 365
favorite 0
comment 0
Cruise fuel consumption, horizon scan platform requirements, and calibration of nozzle thrust measuring techniques for spacecraft control
Topics: CALIBRATING, SPACECRAFT CONTROL, THRUST MEASUREMENT, FUEL CONSUMPTION, HORIZON, HORIZON SCANNERS,...
263
263
Jun 18, 2010
06/10
by
Kanning, G
texts
eye 263
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comment 0
Measured performance of water vapor jets in space vacuum environment for space vehicle attitude control systems
Topics: AEROSPACE ENVIRONMENTS, THRUSTOR, WATER VAPOR, ATTITUDE CONTROL, SPACECRAFT CONTROL, THRUSTORS,...
This thesis documents the design of the hardware and embedded software of a digital computer that provides autonomous control of the PANSAT spacecraft. The system was designed for use during a two year mission in a low earth orbit. The computer uses an Intel M80C186XL running at 7.3728 MHz, 512 kbytes of error-detection and correction RAM, 64 kbytes of ROM, and standard CMOS components to provide a general purpose microcomputer. The purpose of the computer is to control all subsystems of the...
Topics: PANSAT, Digital Computer, Embedded System, Device Drivers, Spacecraft Control
514
514
Jul 11, 2010
07/10
by
Carson, G. T., Jr
texts
eye 514
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Quantitative values were computed which show the effects of the presence of small amounts of oxygen, hydrogen, and hydroxyl radicals on the finite-rate chemical kinetics of premixed hydrogen-air mixtures undergoing isobaric autoignition and combustion. The free radicals were considered to be initially present in hydrogen-air mixtures at equivalence ratios of 0.2, 0.6, 1.0, and 1.2. Initial mixture temperatures were 1100 K, 1200 K, and 1500 K, and pressures were 0.5, 1.0, 2.0, and 4.0 atm. Of...
Topics: SPACE SHUTTLES, SPACECRAFT CONTROL, CONTROL CONFIGURED VEHICLES, DOCUMENTATION, INTERFACES
280
280
May 31, 2011
05/11
by
Dec, John A.; Gasbarre, Joseph F.; George, Benjamin E
texts
eye 280
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The Mars Odyssey spacecraft made use of multipass aerobraking to gradually reduce its orbit period from a highly elliptical insertion orbit to its final science orbit. Aerobraking operations provided an opportunity to apply advanced thermal analysis techniques to predict the temperature of the spacecraft's solar array for each drag pass. Odyssey telemetry data was used to correlate the thermal model. The thermal analysis was tightly coupled to the flight mechanics, aerodynamics, and atmospheric...
Topics: RIDING QUALITY, TRANSPORTATION, HIGHWAYS, STABILITY, SPACECRAFT GUIDANCE, SPACECRAFT CONTROL
282
282
Jun 11, 2011
06/11
by
LeVine, David M.; Haken, Michael; Swift, Calvin T
texts
eye 282
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ESTAR is a research instrument built to develop the technology of aperture synthesis for passive remote sensing of Earth from space. Aperture synthesis is an interferometric technology that addresses the problem of putting large antenna apertures in space to achieve the spatial resolution needed for remote sensing at long wavelengths ESTAR was a first step (synthesis only across track and only at horizontal polarization). The development has progressed to a new generation instrument that is...
Topics: SPACECRAFT CONTROL, ATTITUDE CONTROL, SPACECRAFT MODELS, ACCELEROMETERS, DRAG, DISTURBANCES
467
467
Jun 18, 2010
06/10
by
NON
texts
eye 467
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comment 0
Results from tests of rocket engine for spacecraft reaction control and maneuvering systems
Topics: ENGINE CONTROL, ROCKET ENGINE DESIGN, SPACECRAFT CONTROL, ENGINE TESTS, MANEUVERS, REACTION...
215
215
Jun 21, 2010
06/10
by
NON
texts
eye 215
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comment 0
Successive approximations method for equation integration of laminar multicomponent boundary layer with chemical reactions including ionization
Topics: ATTITUDE CONTROL, PHOTOMULTIPLIER TUBES, SPACECRAFT CONTROL, STAR TRACKERS, SPACECRAFT GUIDANCE
632
632
May 6, 2010
05/10
by
Havill, J. R.; Lopez, A. E.; Ratcliff, J. W
texts
eye 632
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comment 0
Twin gyroscopic control system for three orthogonal axes of space vehicle attitude control
Topics: ATTITUDE CONTROL, GIMBALS, GYROSCOPES, SPACECRAFT, SPACECRAFT CONTROL, ATTITUDE CONTROL, GYROSCOPE
411
411
May 29, 2011
05/11
by
Greer, Donald; Harmory, Phil; Krake, Keith; Drela, Mar
texts
eye 411
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A sailplane being developed at NASA Dryden Flight Research Center will support a high-altitude flight experiment. The experiment will measure the performance parameters or an airfoil at high altitudes (70,000 - 100,000 ft), low Reynolds numbers (2 x 10(exp 5) - 7 x 10(exp 5)), and high subsonic Mach numbers (0.5 and 0.65). The airfoil section lift and drag are determined from pilot and static pressure measurements. The locations of the separation bubble, Tollmien-Schlichting boundary-layer...
Topics: AUTONOMY, SPECIFICATIONS, GROUND SUPPORT SYSTEMS, AUTOMATIC CONTROL, PROTOTYPES, SPACECRAFT CONTROL
547
547
Sep 20, 2010
09/10
by
Ma, Xiwe
texts
eye 547
favorite 0
comment 0
Viewgraphs on an overview of fuzzy logic are presented. Topics covered include: fuzzy control system; fuzzy logic; fuzzy inference; fuzzy controller; and the Sendai subway system.
Topics: ATTITUDE CONTROL, CONTROL THEORY, SPACECRAFT CONTROL, SPACECRAFT MANEUVERS, PAYLOADS, RETRAINING
1,136
1.1K
Jul 11, 2010
07/10
by
NON
texts
eye 1,136
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comment 0
For abstract, see N75-18672.
Topics: CONTROL MOMENT GYROSCOPES, MOMENTUM TRANSFER, SPACECRAFT CONTROL, SPACECRAFT STABILITY, SPIN, TORQUE
253
253
Jun 27, 2010
06/10
by
Buell, D. A.; Johnson, N. S
texts
eye 253
favorite 0
comment 0
No Abstract Available
Topics: MARINER SPACE PROBES, MISSION PLANNING, VOYAGER PROJECT, SPACECRAFT CONTROL, SPACECRAFT GUIDANCE
630
630
texts
eye 630
favorite 0
comment 0
The present invention describes a process for converting vapor streams from sources containing at least one nitrogen-containing oxidizing agent therein to a liquid fertilizer composition comprising the steps of: a) directing a vapor stream containing at least one nitrogen-containing oxidizing agent to a first contact zone; b) contacting said vapor stream with water to form nitrogen oxide(s) from said at least one nitrogen-containing oxidizing agent; c) directing said acid(s) as a second stream...
Topics: AEROSPACE SCIENCES, SPACECRAFT CONTROL, LAUNCHING BASES, GENERAL AVIATION AIRCRAFT, EDUCATION,...
1,133
1.1K
Jul 12, 2010
07/10
by
Helsel, R. W
texts
eye 1,133
favorite 1
comment 0
No Abstract Available
Topics: APOLLO SPACECRAFT, MISSION PLANNING, SPACECRAFT CONFIGURATIONS, EQUIPMENT SPECIFICATIONS,...
615
615
Aug 1, 2010
08/10
by
Ragusa, James; Shaykhian, Gholam A
texts
eye 615
favorite 0
comment 0
No Abstract Available
Topics: AEROSPACE SAFETY, AVIONICS, SPACE SHUTTLE ORBITERS, FLIGHT HAZARDS, SPACECRAFT CONTROL, SPACECRAFT...
184
184
Jul 12, 2010
07/10
by
Putnam, L. H
texts
eye 184
favorite 0
comment 0
No Abstract Available
Topics: FLEXIBLE SPACECRAFT, LARGE SPACE STRUCTURES, SPACECRAFT CONTROL, ALGORITHMS, MATHEMATICAL MODELS,...
332
332
Jun 15, 2011
06/11
by
Hoerz, F.; Quaide, W. L
texts
eye 332
favorite 0
comment 0
Breakdown of crystal lattice structure due to shock effects
Topics: INERTIAL REFERENCE SYSTEMS, SPACECRAFT CONTROL, FREE VIBRATION, SPACECRAFT INSTRUMENTS, STANDING...
216
216
May 23, 2011
05/11
by
Kurth, W. S.; Bolton, S. J.; Gurnett, D. A.; Levin, S
texts
eye 216
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comment 0
During the first Galileo flyby of Ganymede, Jovian radio emissions in the frequency range of 700 kHz to 5.6 MHz were completely occulted by the satellite. We take advantage of this serendipitous observation to determine the location of the radio emission source relative to Jupiter. The evidence suggests that the apparent source is along an L greater than or approximately equal to 7 magnetic field line near the central meridian longitude (approximately 160 deg) of the spacecraft and at 1 to 3...
Topics: ATMOSPHERIC CHEMISTRY, REMOTE SENSING, SPACECRAFT CONTROL, SPACECRAFT DESIGN, SPACECRAFT...
173
173
Jul 10, 2010
07/10
by
KUZIN, M. I.; BOGDANOVA, E. A.; SAKHAROV, V. A.; KHALTAYEV, N. G
texts
eye 173
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MEASUREMENTS OF 400 INTERVALS ON THE EGG WERE RECORDED WITH AN ACCURACY TO 1 MSEC IN 64 PATIENTS AND 30 HEALTHY INDIVIDUALS. INTERVAL HISTOGRAMS WERE ANALYZED AND CARDIOINTERVALOGRAMS ARE PRESENTED IN FIGURES AND GRAPHIC FORM, EGG, POLYCARDIOGRAMS, RESPIRATION CURVES. THE CARDIAC RHYTHM WAS MORE STABLE IN PATIENTS THAN IN HEALTHY INDIVIDUALS, ESPECIALLY IN CASES OF MARKED CHANGES IN THE CONTRACTILE CAPACITY OF THE MYOCARDIUM. IN THE GROUP OF PATIENTS WITH A MORE VARIABLE RHYTHM, THERE WERE...
Topics: AEROSPACE ENGINEERING, SPACECRAFT CONTROL, U.S.S.R., AERODYNAMICS, ARTIFICIAL SATELLITES, ATTITUDE...
370
370
Jul 12, 2010
07/10
by
NON
texts
eye 370
favorite 0
comment 0
No Abstract Available
Topics: SATURN 1 LAUNCH VEHICLES, SPACECRAFT CONTROL, SPACECRAFT MANEUVERS, SPACECRAFT PERFORMANCE, SYSTEMS...
277
277
Jun 1, 2011
06/11
by
Ackeret, J.; Feldmann, F.; Rott, N
texts
eye 277
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comment 0
The mutual influences of compression shocks and friction boundary layers were investigated by means of high speed wind tunnels.Schlieren optics provided a clear picture of the flow phenomena and were used for determining the location of the compression shocks, measurement of shock angles, and also for Mach angles. Pressure measurement and humidity measurements were also taken into consideration.Results along with a mathematical model are described.
Topics: DISTRIBUTED PARAMETER SYSTEMS, SPACECRAFT CONTROL, SPACE STATIONS, SCHEDULING, PLANNING, REAL TIME...
389
389
Jun 1, 2010
06/10
by
Alekseyev, K. B.; Bebenin, G. G
texts
eye 389
favorite 0
comment 0
Flight aerodynamics and spacecraft control during descent into earth atmosphere
Topics: AERODYNAMICS, ATMOSPHERIC ENTRY, DESCENT TRAJECTORY, EARTH ATMOSPHERE, GUIDANCE AND CONTROL,...
2,271
2.3K
texts
eye 2,271
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This special bibliography includes research on reusable launch vehicles, aerospace planes, shuttle replacement, crew/cargo transfer vehicle, related X-craft, orbital space plane, and next generation launch technology.
Topics: KALMAN FILTERS, ATTITUDE (INCLINATION), MATHEMATICAL MODELS, SPACECRAFT CONTROL, QUATERNIONS,...
424
424
May 21, 2011
05/11
by
Brosi, Fre
texts
eye 424
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comment 0
This paper describes the problems involved in uplink of data from control centers on the ground to spacecraft, and explores the solutions to those problems, past. present. and future. The evolution of this process, from simple commanding to transfer of large volumes of data and commands is traced. The need for reliable end-to-end protocols for commanding and file transfer is demonstrated, and the shortcomings of both existing telecommand protocols and commercial products to meet this need are...
Topics: GEOSYNCHRONOUS ORBITS, ORBITAL MECHANICS, POSITIONING, STATIONKEEPING, SYNCHRONOUS PLATFORMS, HUMAN...
211
211
May 22, 2011
05/11
by
NON
texts
eye 211
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Formed in Jan. 1992, the Panel to Review EOSDIS Plans was charged with advising NASA on its plans for developing the Earth Observing System (EOS) Data and Information System (EOSDIS). Specifically, the panel was asked to do the following: assess the validity of the engineering and technical underpinnings of the EOSDIS; assess its potential value to scientific users; suggest how technical risk can be minimized; and assess whether current plans are sufficiently resilient to be adaptable to...
Topics: FLIGHT OPERATIONS, SPACE MISSIONS, SPACECRAFT CONTROL, TOTAL QUALITY MANAGEMENT, PERSONNEL...
A three-axis controlled spacecraft (1), typically a satellite, is spun up about its roll axis (20) prior to firing a motor (2), i.e., a perigee kick motor, to achieve the requisite degree of angular momentum stiffness. Thrusters (21) for imparting rotation about the roll axis (20) are activated in open-loop fashion, typically at less than full duty cycle. Cross-axis torques induced by this rotational motion are compensated for by means of closed control loops for each of the pitch and yaw axes...
Topics: NASA Technical Reports Server (NTRS), ROLL, SPACECRAFT CONTROL, PATENTS, Vorlicek, Preston L....
264
264
Jun 21, 2010
06/10
by
Argoud, M. J
texts
eye 264
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comment 0
Design, and instrumentation of modified space environment simulator for spacecraft testing
Topics: MEASURING INSTRUMENTS, SPACE ENVIRONMENT SIMULATION, SPACECRAFT CONTROL, STRUCTURAL DESIGN, SPACE...
907
907
May 31, 2011
05/11
by
Mueller, J. L.; Trees, C.; Austin, R. W.; Pietras, C.; Hooker, S.; Holben, B.; McClain, Charles R.; Clark, D. K.; Yuen, M., et al
texts
eye 907
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comment 0
This document stipulates protocols for measuring bio-optical and radiometric data for the SIMBIOS Project. It supersedes the earlier version, and is organized into four parts: Introductory Background, Instrument Characteristics, Field Measurements and Data Analysis, Data Reporting and Archival. Changes in this revision include the addition of three new chapters: (1) Fundamental Definitions, Relationships and Conventions; (2) MOBY, A Radiometric Buoy for Performance Monitoring and Vicarious...
Topics: MICROSATELLITES, TEMPERATURE CONTROL, EMITTANCE, SPACECRAFT INSTRUMENTS, AEROSPACE ENGINEERING,...
171
171
Sep 20, 2010
09/10
by
Franz, J. R
texts
eye 171
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comment 0
Numerical calculations of the electronic properties of liquid II-VI semiconductors, particularly CdTe and ZnTe were performed. The measured conductivity of these liquid alloys were modeled by assuming that the dominant temperature effect is the increase in the number of dangling bonds with increasing temperature. For low to moderate values of electron correlation, the calculated conductivity as a function of dangling bond concentration closely follows the measured conductivity as a function of...
Topics: ALGORITHMS, ATTITUDE (INCLINATION), ATTITUDE CONTROL, COMMAND AND CONTROL, ESTIMATING, SPACECRAFT...
294
294
Jul 11, 2010
07/10
by
Marcy, R. D
texts
eye 294
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Results of a program conducted to evaluate materials for construction of a space shuttle hydrazine monopropellant gas generator are presented. The program was designed to select those materials that maintain the properties of strength and ductility after exposure to an 1800 F nitriding environment for 1000 hours.
Topics: AVIONICS, SPACE TUGS, SPACECRAFT CONFIGURATIONS, DATA MANAGEMENT, DIGITAL COMPUTERS, SPACECRAFT...
Ride quality on highways and railways improved by Marshall Space Flight Center's stabilized spacecraft guidance and control systems. Instruments for profiling roadways are enhanced by addition of stable three-axis platform-type inertial reference. System can measure banks, bumps, curves, grades, elevations, speeds, and roadway undulations. Appropriate computer programs can be written to answer future questions concerning roadbed.
Topics: NASA Technical Reports Server (NTRS), RIDING QUALITY, TRANSPORTATION, HIGHWAYS, STABILITY,...
The ESSOPE is a prototype front-end tool running on a Sun workstation and interfacing to ESOC's MSSS spacecraft control system for the exchange of telecommand requests (to MSSS) and telemetry reports (from MSSS). ESSOPE combines an operations Planner-Scheduler, with a Schedule Execution Control function. Using an internal 'model' of the spacecraft, the Planner generates a schedule based on utilization requests for a variety of payload services by a community of Olympus users, and incorporating...
Topics: NASA Technical Reports Server (NTRS), SCHEDULES, SPACECRAFT CONTROL, TELEMETRY, PAYLOADS,...
280
280
Jun 9, 2011
06/11
by
Nixon, Mark W.; Kvaternik, Raymond G.; Settle, T. Be
texts
eye 280
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comment 0
The results of a joint NASA/Army/Bell Helicopter Textron wind-tunnel test to assess the potential of higher harmonic control (HHC) for reducing vibrations in tiltrotor aircraft operating in the airplane mode of flight, and to evaluate the effectiveness of a Bell-developed HHC algorithm called MAVSS (Multipoint Adaptive Vibration Suppression System) are presented. The test was conducted in the Langley Transonic Dynamics Tunnel using an unpowered 1/5- scale semispan aeroelastic model of the V-22...
Topics: ATTITUDE CONTROL, CONTROL THEORY, SIMULATION, SMALL SATELLITE TECHNOLOGY, NONLINEAR PROGRAMMING,...
344
344
Jun 21, 2010
06/10
by
Smith, L. G
texts
eye 344
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comment 0
Characteristics of D and E regions of ionosphere
Topics: AERODYNAMIC CHARACTERISTICS, ATMOSPHERIC ENTRY, LIFTING REENTRY VEHICLES, SPACE SHUTTLES, LIFT DRAG...
410
410
Jun 15, 2011
06/11
by
NON
texts
eye 410
favorite 0
comment 0
No Abstract Available
Topics: MARINER C SPACECRAFT, MARS PROBES, SPACECRAFT CONTROL, SPACECRAFT DESIGN, SPACECRAFT GUIDANCE,...
433
433
Jul 6, 2010
07/10
by
Smith, I. D
texts
eye 433
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comment 0
Results of tests conducted to evaluate the behavior of nonmetallic materials in hydrogen are described. The reaction propagation test simulates the conditions resulting from the interaction of an electrical wire in an overload condition in contract with a material in the test medium. The test is designed to evaluate the behavior of a material subjected to an energy input (usually heat) sufficient to cause a reaction which propagates to consume larger quantities of the material. Ten nonmetallic...
Topics: ATMOSPHERIC ENTRY, REENTRY PHYSICS, SPACECRAFT CONTROL, AERODYNAMIC CHARACTERISTICS, NUMERICAL...
666
666
Jul 12, 2010
07/10
by
NON
texts
eye 666
favorite 0
comment 0
No Abstract Available
Topics: NOVA LAUNCH VEHICLES, PROPULSION SYSTEM CONFIGURATIONS, SOLID PROPELLANT ROCKET ENGINES,...
412
412
Jul 11, 2010
07/10
by
MASSON, A
texts
eye 412
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comment 0
THE INSTALLATION FOR INVESTIGATIONS ON FULLSCALE OR LARGE-SCALE MODELS OF CONVENTIONAL AIRCRAFT OR CONVERTIPLANE PROPELLERS IN A LARGE SONIC WIND TUNNEL IS DESCRIBED. SOME EXAMPLES OF TESTS CARRIED OUT AND TYPICAL RESULTS OBTAINED ILLUSTRATE THE USE CAPABILITY OF THE EQUIPMENT, WHICH IS ALSO SUITABLE FOR HELICOPTER ROTOR TESTS.
Topics: AERODYNAMIC DRAG, ORBIT CALCULATION, SPACECRAFT CONTROL, TRAJECTORY ANALYSIS, ATMOSPHERIC DENSITY,...
789
789
Jun 15, 2011
06/11
by
NON
texts
eye 789
favorite 0
comment 0
No Abstract Available
Topics: MARINER C SPACECRAFT, MARINER VENUS 67 SPACECRAFT, VOYAGER PROJECT, SPACECRAFT CONTROL, SPACECRAFT...
545
545
Jul 12, 2010
07/10
by
Stockemer, F. J
texts
eye 545
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comment 0
Scale model fuel heating systems for use with aviation hydrocarbon fuel at low temperatures were investigated. The effectiveness of the heating systems in providing flowability and pumpability at extreme low temperature when some freezing of the fuel would otherwise occur is evaluated. The test tank simulated a section of an outer wing tank, and was chilled on the upper and lower surfaces. Turbine engine lubricating oil was heated, and recirculating fuel transferred the heat. Fuels included: a...
Topics: ALGORITHMS, ATTITUDE (INCLINATION), ESTIMATING, SPACECRAFT STABILITY, SPIN STABILIZATION,...
267
267
Jul 11, 2010
07/10
by
NON
texts
eye 267
favorite 0
comment 0
No Abstract Available
Topics: GROUND SUPPORT SYSTEMS, LUNAR SURFACE VEHICLES, REMOTELY PILOTED VEHICLES, MISSION PLANNING, REMOTE...
909
909
Jul 11, 2010
07/10
by
NON
texts
eye 909
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comment 0
MEDICAL, SOCIAL, PSYCHOLOGICAL, AND PHYSIOLOGICAL PROBLEMS RAISED BY NOISE POLLUTION ARE REPORTED. MEDICAL ASPECTS OF AIRPORT NOISE, NOISE INDUCED HEARING LOSSES IN VARIOUS INDUSTRIES AND NOISE ANNOYANCE ARE DISCUSSED. THERE ARE ALSO SEVERAL ARTICLES ON THE BIOPHYSICAL AND MEDICAL EFFECTS OF ULTRASOUNDS.
Topics: FLEXIBLE BODIES, SPACECRAFT CONTROL, SPACECRAFT MOTION, SPACECRAFT STABILITY, COMPUTER AIDED...
415
415
Jun 21, 2010
06/10
by
NON
texts
eye 415
favorite 0
comment 0
Computerized simulation of Venus atmospheric entry by earth reentry, and test program on soil response to landing loads
Topics: ELECTROSTATIC GYROSCOPES, INERTIAL PLATFORMS, LENS DESIGN, SPACECRAFT CONTROL, DAMPING, PERFORMANCE...
"Automated sequence generation" (autogen) signifies both a process and software used to automatically generate sequences of commands to operate various spacecraft. The autogen software comprises the autogen script plus the Activity Plan Generator (APGEN) program. APGEN can be used for planning missions and command sequences.
Topics: NASA Technical Reports Server (NTRS), SEQUENCING, SCHEDULING, AUTOMATIC CONTROL, SPACECRAFT...
418
418
Jul 12, 2010
07/10
by
Harada, Y
texts
eye 418
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comment 0
Four optical materials were exposed to simulated solar and particulate radiation in a space environment. Sapphire and fused silica experienced little change in transmittance while optical crown glass and ultra low expansion glass darkened appreciably. A complete analysis of the 500 hour simulated space exposure test was conducted. Additionally, studies were performed to aid in sample selection for a 100 hour simulated exposure test.
Topics: ATTITUDE CONTROL, COMPENSATORS, POINTING CONTROL SYSTEMS, SPACECRAFT CONTROL, TORQUE, COMMUNICATION...
191
191
Jun 26, 2010
06/10
by
Neyland, V. YA
texts
eye 191
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comment 0
Turbulence diffusion above flow during boundary layer and hypersonic flow interaction
Topics: ENGINE DESIGN, ION ENGINES, RADIATIVE HEAT TRANSFER, SPACECRAFT CONTROL, THRUST AUGMENTATION, HEAT...
524
524
May 31, 2011
05/11
by
DAgostino, Mark G.; Lee, Young C.; Wang, Ten-Se
texts
eye 524
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comment 0
Wide band plume radiation data were collected during ten sea level tests of a single XRS-2200 engine at the NASA Stennis Space Center in 1999 and 2000. The XRS-2200 is a liquid hydrogen/liquid oxygen fueled, gas generator cycle linear aerospike engine which develops 204,420 lbf thrust at sea level. Instrumentation consisted of six hemispherical radiometers and one narrow view radiometer. Test conditions varied from 100% to 57% power level (PL) and 6.0 to 4.5 oxidizer to fuel (O/F) ratio....
Topics: INTERNETS, NASA PROGRAMS, PROTOCOL (COMPUTERS), ARCHITECTURE (COMPUTERS), SPACECRAFT CONTROL,...
