Structural and environmental studies of acoustical duct-lining materials
Structural and environmental design criteria for acoustical duct-lining materials in turbofan noise suppression
Watson, H. A., Jr.↗
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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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Use of thermal analyses of systems to evolve development projects in spacecraft thermal control concepts
System and component models for spacecraft thermal control design, considering materials, environmental degradation, measurement errors, manufacturing and quality assurance
Turner, M. A.↗
Apollo experience report: Crew provisions and equipment subsystem
A description of the construction and use of crew provisions and equipment subsystem items for the Apollo Program is presented. The subsystem is composed principally of survival equipment, bioinstrumentation devices, medical components and accessories, water- and waste-management equipment, personal-hygiene articles, docking aids, flight garments (excluding the pressure garment assembly), and various other crew-related accessories. Particular attention is given to items and assemblies that presented design, development, or performance problems: the crew optical alinement sight system, the metering water dispenser, and the waste-management system. Changes made in design and materials to improve the fire safety of the hardware are discussed.
Mcallister, F.↗
Solid lubricants: A survey
A survey is presented of the most recent developments and trends in the field of solid lubrication. Topics discussed include: a history of solid lubrication, lubricating solids, bonded lubricants, new developments, methods of evaluation, environmental effects, application methods, novel materials, and designs for the use of solid lubricants. Excerpts of solid lubricant specifications and a discussion of contact stresses imposed on specimens in three types of test machines used for the evaluation of solid lubricants are presented.
Campbell, M. E.↗
Mishaps with oxygen in NASA operations.
Oxygen safety programs were conducted, taking into consideration a review of the hazards, the available data concerning the failure of components and systems, and the oxygen handling procedures followed by NASA and its contractors. Information is presented regarding a substantial number of oxygen mishaps together with safety regulations aimed at reducing the accident probability. The information was used to establish categories of events causing the mishap. These categories include materials incompatibility deficiency, materials failure, design deficiency, cleaning deficiency, and procedural deficiencies. Mishaps are generally caused by a number of interacting factors.
Ordin, P. M.↗
Application of planetary quarantine methodology and spacecraft sterilization technology to improved health care delivery.
In 1969 the Jet Propulsion Laboratory undertook an investigation to determine which of its space-derived capabilities could make significant contributions to the improvement of health care delivery in the U.S. The area of planetary quarantine was identified as one of high relevance. Two studies were conducted in this connection. The first study, which could contribute to infection reduction and control, was concerned with conversion of infection implicated complex, nonheat sterilizable equipment to dry heat, sterilizable equipment by changes in design and materials of construction. The second study area related to hospital acquired infection is clean room technology. A definite investigation has been performed to demonstrate and statistically evaluate performance under controlled conditions.
Green, R. H.↗
Oxidation resistant carbon-carbon composite for Space Shuttle application.
An oxidation resistant carbon-carbon composite has been developed for use on the NASA Space Shuttle Orbiter Vehicle which can function on the high temperature surfaces to satisfy the 100 mission reuse capability requirement. This paper describes the design requirements, materials and processes developed, and the successful testing of simulated full-scale prototype hardware. Materials considerations are illustrated, including strength and oxidation testing, along with physical property determinations, characterizing the material over the predicted temperature range of use.
Rogers, D. C.↗
Liquid rocket engine turbopump shafts and couplings
Design criteria and recommended practices are presented for designing tubopump shafts and couplings. Design parameters, material selection, and structural analysis are discussed.
Source record↗
Erosion and the gas turbine engine, part 2
Procedures for protecting aircraft engines from impact damage due to sand and dust particles are discussed. One system is to develop a filtration system to remove most of the solid particles. Another method is to design blade materials and blade protection coatings. The concepts of erosion within aircraft engines are explained. Curves are presented to show the effect of impingement angle on ductile and elastic modes of erosion. Engine sand and dust ingestion tests were conducted on T63-A-5A engines and the results are produced in graph form. The results of tests conducted in a dynamic erosion facility are analyzed.
Newhart, J. E.↗
Analysis of Navy radome failure problems
A survey of radome failure problems in military aircraft under actual operating conditions was conducted. The aircraft were operating from aircraft carriers in the Pacific Ocean. Critical problem areas were identified and a plan was developed for failure prevention. The development and application of repair kits for correcting the erosion damage are reported. It is stated that the rain erosion damage survey established a strong justification for qualification testing of all materials and designs which may have questionable life expectancy on the aircraft.
Tatnall, G. J.↗
High friction interactive aircraft tire-runway systems
The principle of utilizing geometric interaction between runway asperities and tire pattern design is discussed, and a theoretical basis is presented for substantial enhancement of frictional effects by this process. Test data confirming this is given. First order analytical expressions are given for the increased friction coefficients and for the engagement distances required. High speed friction data on a 7.00 x 8 aircraft tire is presented confirming this. Example design geometries are shown for the tire tread groove pattern, and designs and materials are discussed for the asperity grid and its attachment system.
Clark, S. K.↗
Long life, high speed, thrust-load ball bearings
Long-term bearing operation at three million DN can be achieved with high degree of reliability using full combination of sophisticated but currently available state-of-the-art bearing materials and designs, lubricants, and lubricating techniques.
Signer, H.↗
Vapor compression distillation module
A Vapor Compression Distillation (VCD) module was developed and evaluated as part of a Space Station Prototype (SSP) environmental control and life support system. The VCD module includes the waste tankage, pumps, post-treatment cells, automatic controls and fault detection instrumentation. Development problems were encountered with two components: the liquid pumps, and the waste tank and quantity gauge. Peristaltic pumps were selected instead of gear pumps, and a sub-program of materials and design optimization was undertaken leading to a projected life greater than 10,000 hours of continuous operation. A bladder tank was designed and built to contain the waste liquids and deliver it to the processor. A detrimental pressure pattern imposed upon the bladder by a force-operated quantity gauge was corrected by rearranging the force application, and design goals were achieved. System testing has demonstrated that all performance goals have been fulfilled.
Nuccio, P. P.↗
NASA thermionic-conversion program
Current out-of-core emphases allow converter material and design freedoms previously prohibited by in-core nucleonic and geometric restrictions. As a result, potential improvements indicate possibilities for severalfold increases in efficiencies. The new TEC-ART program concentrated initially on low-work function collectors and interelectrode-loss reduction and revealed much in a short time. This new emission capability coupled with improved collectors that maintain performance with emitter-vapor deposit accumulations are requisites for efficient, enduring thermionic converters.
Morris, J. F.↗
Systematically disseminating technological information to potential users
Rapid technological information dissemination system related to the field of remote sensing is presented. The technology transfer staff systematically designed instructional materials and activities using the matrix as an organizer to meet the need of the students, scientists and users in a rapidly expanding technology.
Russell, J. D.↗
Proceedings of the SCAR Conference, part 2
Development advancements of the Supersonic Cruise Aircraft are discussed including environmental engineering aircraft structures and materials and design integration.
Source record↗
Rationale for structural inspections
The methods developed to predict the reliability of aircraft structures depend upon inspection effectiveness which, in turn, depends upon structural complexity, quality, and the percentage of the structure inspected. Reliability can be enhanced by choosing materials properly, designing damage-tolerant structures, and increasing inspection frequency. And, for fleet operations, costs can be minimized through proper inspection schedules, and enhanced reliability can be compatible with minimum cost. The methods are derived from a combination of probability theory and engineering equations. A discussion of these methods is presented.
Davidson, J. R.↗
NASA thermionic-conversion program
The NASA applied research and technology (ART) program for thermionic energy conversion (TEC) is progressing effectively. Current out-of-core emphases allow converter material and design freedoms previously prohibited by in-core nucleonic and geometric restrictions. As a result, potential improvements indicate possibilities for severalfold increases in efficiencies. The new TEC-ART program concentrated initially on low-work-function collectors and interelectrode-loss reduction and revealed much in a short time. For example, arc-drop studies verified the necessity of stable emitters that operate well with little or no adsorbed cesium. This new emission capability coupled with improved collectors that maintain performance with emitter-vapor deposit accumulations are requisites for efficient, enduring thermionic converters. The accomplishments and contributors in these areas are discussed.
Morris, J. F.↗