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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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Electrode materials for cesium contact ion engines.
Focusing and accelerating electrode materials for cesium contact ion engines, noting advantages of copper, beryllium and molybdenum
Development of automatic control systems for electron bombardment and contact ion engines
Cesium vapor automatic control systems for electron bombardment and contact ion engines
Contact ion engine system for ATS satellites D and E Annual progress report, 22 Mar. 1967 - 22 Mar. 1968
Ion microthrustor systems and ground support equipment for Applications Technology Satellites D and E
Contact Ion Engine System for ATS Satellites D and E Annual Progress Report
Performance testing of ion microthruster systems for Applications Technology Satellites
Development and testing of porous ionizer materials, part I Summary report, Feb. 1965 - May 1966
Development and testing of porous tungsten ionizer materials for cesium contact engines
Ion trajectory studies of the integral-focus, linear-strip cesium contact thrustor.
Computer program for current profile and trajectory analysis for cesium contact thrustor leading to integral focus configuration of multistrip contact engines for long space missions
A status report on an ion engine development program.
Multistrip cesium contact ion engine using tungsten ionizer increases theoretical life by orders of magnitude
Applications of aerospace technology to petroleum extraction and reservoir engineering
Through contacts with the petroleum industry, the petroleum service industry, universities and government agencies, important petroleum extraction problems were identified. For each problem, areas of aerospace technology that might aid in its solution were also identified, where possible. Some of the problems were selected for further consideration. Work on these problems led to the formulation of specific concepts as candidate for development. Each concept is addressed to the solution of specific extraction problems and makes use of specific areas of aerospace technology.
Update: Advancement of Contact Dynamics Modeling for Human Spaceflight Simulation Applications
Pong is a new software tool developed at the NASA Johnson Space Center that advances interference-based geometric contact dynamics based on 3D graphics models. The Pong software consists of three parts: a set of scripts to extract geometric data from 3D graphics models, a contact dynamics engine that provides collision detection and force calculations based on the extracted geometric data, and a set of scripts for visualizing the dynamics response with the 3D graphics models. The contact dynamics engine can be linked with an external multibody dynamics engine to provide an integrated multibody contact dynamics simulation. This paper provides a detailed overview of Pong including the overall approach and modeling capabilities, which encompasses force generation from contact primitives and friction to computational performance. Two specific Pong-based examples of International Space Station applications are discussed, and the related verification and validation using this new tool are also addressed.
Automatic control systems for ion engines.
Automatic control systems for electron bombardment and contact ion engines
Ion engine development Final summary report
High thrust density multistrip cesium contact ion engine development
A program to develop high perveance ionizers
Emitter fabrication and testing, engine testing and performance, and accelerator material studies in development of cesium contact ion engine
Factors that Affect Operational Reliability of Turbojet Engines
The problem of improving operational reliability of turbojet engines is studied in a series of papers. Failure statistics for this engine are presented, the theory and experimental evidence on how engine failures occur are described, and the methods available for avoiding failure in operation are discussed. The individual papers of the series are Objectives, Failure Statistics, Foreign-Object Damage, Compressor Blades, Combustor Assembly, Nozzle Diaphrams, Turbine Buckets, Turbine Disks, Rolling Contact Bearings, Engine Fuel Controls, and Summary Discussion.
Thermodynamic limits for solar energy conversion by a quantum-thermal hybrid system
The limits are presented fo air mass 1.5 conditions. A maximum conversion efficiency of 74 percent is thermodynamically achievable for the quantum device operating at 3500 K and the heat engine in contact with a reservoir at 0 K. The efficiency drops to 56 percent for a cold reservoir at approximately room temperature conditions. Hybrid system efficiencies exceed 50 percent over receiver temperatures ranging from 1400 K to 4000 K, suggesting little benefit is gained in operating the system above 1400 K. The results are applied to a system consisting of a photovoltaic solar cell in series with a heat engine.
INVESTIGATION OF RF NOISE GENERATION FROM SPACE VEHICLES
Radio frequency noise generation in electrical propulsion devices, specifically the cesium contact ion engine
Surface ionization studies on refractory metals and metal alloys
Surface ionization studies on refractory metals and metal alloys used in long term contact ion engine operation