An investigation of the use of acoustic energy absorbers to damp LOX/RP-1 COMBUSTION oscillations
High temperature environmental corrosion testing of liquid plutonium alloy fuels
LIQUID OXYGEN /LOX/↗
SEARCH · Engineering Papers
Results for “environmental testing”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Centaur solid state inverter failure during simulated flight in an environmental space chamber
Centaur solid state inverter failure during simulated flight in environmental space chamber
SPACECRAFT COMPONENT↗
Status of lubricants for manned spacecraft.
Lubricant selection for lunar missions and manned spacecraft based on compatibility with oxygen-rich environment, propellant, anodic coatings and sliding friction behavior in vacuum
MANNED SPACECRAFT↗
The surface emittance of vacuum-metallized polyester film.
Thickness, material type, environmental and surface emittance of radiation shield effects on thermal performance of multilayer insulation system
COATING↗
A connector sealing technique for extended- mission computers.
Humidity, temperature, contamination and disconnection effects on gasket and grease seals for extended space mission computer connectors
ENVIRONMENTAL TESTING↗
The electronic checkout and integration of Orbiting Geophysical Observatory experiments.
Electronic checkout, environmental qualification and integration of OGO by spacecraft simulator and performance analysis system
ENVIRONMENTAL TESTING↗
Biological thermal requirements in helium- oxygen environments.
Helium-oxygen environment relation to biological-thermal requirements of spacecrew
THERMAL COMFORT↗
Skin friction balance components for hostile environments.
Aircraft skin friction balance components for hostile environments noting system design
HIGH TEMPERATURE MATERIAL↗
A case history of titanium stress corrosion in nitrogen tetroxide.
Ti stress corrosion in nitrogen tetroxide, detailing investigative techniques
TITANIUM↗
Experimental studies of the Pegasus thermal control louver system.
Pegasus thermal control louver system characteristics determined by environmental chamber testing, noting testing configuration
Linton, R. C.↗
The earth-moon test range
Earth-moon test range for testing earth environmental characteristics in cislunar space, discussing administrative benefits
Wigand, R. C.↗
Study and development of acoustic treatment for jet engine tailpipes
A study and development program was accomplished to attenuate turbine noise generated in the JT3D turbofan engine. Analytical studies were used to design an acoustic liner for the tailpipe. Engine ground tests defined the tailpipe environmental factors and laboratory tests were used to support the analytical studies. Furnace-brazed, stainless steel, perforated sheet acoustic liners were designed, fabricated, installed, and ground tested in the tailpipe of a JT3D engine. Test results showed the turbine tones were suppressed below the level of the jet exhaust for most far field polar angles.
Nelson, M. D.↗
Central Atlantic regional ecological test site: A prototype regional environmental information system
The author has identified the following significant results. Preliminary analysis of the capabilities of ERTS-1 data in land use mapping and change detection has revealed that Level 1 land use mapping can be performed and that in some cases land use changes can be identified. Land use interpretation was accomplished with the aid of a film projection viewer and the I2S additive color viewer. By varying the filters and illumination of each spectral band it was possible to better distinguish urban areas and transportation routes. Also it enabled the toning down of signatures such as cropland and forests which on many color infrared composite photographs were washed out with strong red tints. It appears that ERTS-1 imagery is useful not only for Level 1 mapping at scales of 1:250,000 or smaller, but also for monitoring agricultural changes and locating areas of construction, when such land uses approach an area of approximately two hectares.
Alexander, R. H.↗
Central Atlantic regional ecological test site: A prototype regional environmental information system
The author has identified the following significant results. A comparison of photomorphic regions from an uncontrolled ERTS-1 mosaic of CARETS to land use areas on a map published in the National Atlas revealed close correlations in non-urban regions. Such regional scale analysis of ERTS-1 data has the potential for providing an economical sampling strategy for selecting sites for more detailed field measurements if other environmental variables can be correlated with patterns on ERTS-1 imagery. ERTS-1 imagery has also revealed for the first time the appearance of CARETS during the winter months. Investigators have identified extensive areas of conifers, which have previously been indistinguishable from deciduous vegetation. Imagery has also shown very clearly the extent of snow cover at a particular time over the region. The evaluation of ERTS-1 imagery used for the land use mapping of the shore zone of CARETS, has shown that the presence or absence of elements of an hierarchal system of shoreline landforms can help identify areas of potential rapid change. Changes in land use class distributions on the Barrier Islands signify the environmental response to natural and man-caused processes. Both environmental vulnerability and sensitivity can be estimated from the repetitive ERTS-1 coverage of long reaches of the CARETS coast. Results indicate potential applications to land use planning, management, and regional environmental quality analysis.
Alexander, R. H.↗
Development of an advanced high-temperature fastener system for advanced aerospace vehicle application
The results of a program to develop a lightweight high temperature reusable fastening system for aerospace vehicle thermal protection system applications are documented. This feasibility program resulted in several fastener innovations which will meet the specific needs of the heat shield application. Three systems were designed from Hayes 188 alloy and tested by environmental exposure and residual mechanical properties. The designs include a clinch stud with a collar retainer, a weld stud with a split ring retainer, and a caged stud with a collar retainer. The results indicated that a lightweight, reusable, high temperature fastening system can be developed for aerospace vehicle application.
Kull, F. R.↗
Analysis of the measured effects of the principal exhaust effluents from solid rocket motors
The feasibility of conducting environmental chamber tests using a small rocket motor to study the physical processes which occur when the exhaust products from solid motors mix with the ambient atmosphere was investigated. Of particular interest was the interaction between hydrogen chloride, aluminum oxide, and water vapor. Several types of instruments for measuring HCl concentrations were evaluated. Under some conditions it was noted that acid aerosols were formed in the ground cloud. These droplets condensed on Al2O3 nuclei and were associated with the rocket exhaust cooling during the period of plume rise to stabilization. Outdoor firings of the solid rocket motors of a 6.4 percent scaled model of the space shuttle were monitored to study the interaction of the exhaust effluents with vegetation downwind of the test site. Data concerning aluminum oxide particles produced by solid rocket motors were evaluated.
Dawbarn, R.↗
Evaluation of high temperature structural adhesives for extended service
The evaluation, selection, and demonstration of structural adhesive systems for supersonic cruise research applications, and establishment of environmental durability of selected systems for up to 20,000 hours is described. Ten candidate adhesives were initially evaluated. During screening and evaluation, these candidates were narrowed to three of the most promising for environmental durability testing. The three adhesives were LARC-13, PPQ, and NR056X. The LARC-13 was eliminated because of a lack of stability at 505 K. The NRO56X was removed from the market. The LARC-TPI was added after preliminary evaluation and an abbreviated screening test. Only PPQ and LARC-TPI remained as the reasonable candidates late into the durability testing. Large area bond panels were fabricated to demonstrate the processibility of the selected systems. Specifications were prepared to assure control over critical material and process parameters. Surface characterization concentrated primarily upon titanium surface treatments of 10 volt chronic acid anodize, 5 volt chromic acid anodize and PASA-JELL. Failure analysis was conducted on lap shear adhesive bond failures which occurred in PPQ and LARC-13 test specimens after 10,000 hours at 505 K.
Hill, S. G.↗