Engineering topics

Stofan, Andrew J.

Publications and source records attributed to Stofan, Andrew J..

6 records

NASA NTRS1989

Space station: A step into the future

The Space Station is an essential element of NASA's ongoing program to recover from the loss of the Challenger and to regain for the United States its position of leadership in space. The Space Station Program has made substantial progress and some of the major efforts undertaken are discussed briefly. A few of the Space Station policies which have shaped the program are reviewed. NASA is dedicated to building a Station that, in serving science, technology, and commerce assured the United States a future in space as exciting and rewarding as the past. In cooperation with partners in the industry and abroad, the intent is to develop a Space Station that is intellectually productive, technically demanding, and genuinely useful.

Stofan, Andrew J.↗

NASA NTRS1987

A research laboratory in space

The current status of the Space Station program is briefly reviewed. A three-year definition and preliminary design study, now completed, has produced the Revised Baseline Configuration featuring a 110-m-long horizontal boom with four pressurized models attached that are connected by resource nodes outfitted with Station subsystems. One of the modules is a habitat; the other three are laboratories provided by the U.S., Europe, and Japan. The main components and systems of the Revised Baseline Configuration are characterized, and some aspects of project management and international cooperation are discussed.

Stofan, Andrew J.↗

NASA NTRS1987

Preparing for the future

Technologies and programs related to the development, construction, and operation of the Space Station are examined. A phase approach has been chosen for the construction of the Space Station, which is to have a revised baseline configuration. Consideration is given to the use of automation on the Space Station; the assembly and servicing of the Station; user requirements; and Space Station operations. The benefits the Space Station will provide to space exploration are discussed.

Stofan, Andrew J.↗

NASA NTRS1986

Materials Research Capabilities

Lewis Research Center, in partnership with U.S. industry and academia, has long been a major force in developing advanced aerospace propulsion and power systems. One key aspect that made many of these systems possible has been the availability of high-performance, reliable, and long-life materials. To assure a continuing flow of new materials and processing concepts, basic understanding to guide such innovation, and technological support for development of major NASA systems, Lewis has supported a strong in-house materials research activity. Our researchers have discovered new alloys, polymers, metallic composites, ceramics, coatings, processing techniques, etc., which are now also in use by U.S. industry. This brochure highlights selected past accomplishments of our materials research and technology staff. It also provides many examples of the facilities available with which we can conduct materials research. The nation is now beginning to consider integrating technology for high-performance supersonic/hypersonic aircraft, nuclear space power systems, a space station, and new research areas such as materials processing in space. As we proceed, I am confident that our materials research staff will continue to provide important contributions which will help our nation maintain a strong technology position in these areas of growing world competition. Lewis Research Center, in partnership with U.S. industry and academia, has long been a major force in developing advanced aerospace propulsion and power systems. One key aspect that made many of these systems possible has been the availability of high-performance, reliable, and long-life materials. To assure a continuing flow of new materials and processing concepts, basic understanding to guide such innovation, and technological support for development of major NASA systems, Lewis has supported a strong in-house materials research activity. Our researchers have discovered new alloys, polymers, metallic composites, ceramics, coatings, processing techniques, etc., which are now also in use by U.S. industry. This brochure highlights selected past accomplishments of our materials research and technology staff. It also provides many examples of the facilities available with which we can conduct materials research. The nation is now beginning to consider integrating technology for high-performance supersonic/hypersonic aircraft, nuclear space power systems, a space station, and new research areas such as materials processing in space.

Stofan, Andrew J.↗

NASA NTRS1986

Space station: The next logical step

The following topics with respect to the space station program are discussed: (1) unmanned free-flyers; (2) recent progress; (3) the space shuttle; (4) international participation; (5) science, commerce, and technology; and (6) private sector participation.

Stofan, Andrew J.↗

NASA NTRS1960

Internal Performance Evaluation of a Two Position Divergent Shroud Ejector

A two-position divergent shroud ejector was investigated in an unheated quiescent-air facility over a range of operational variables applicable to a Mach 2.5 aircraft. The performance data are shown in terms of hypothetical engine operating conditions to illustrate variations of performance with Mach number. The overall thrust performance was reasonably good, with ejector thrust ratios ranging from 0.97 to 0.98 for all conditions except that corresponding to acceleration with afterburning through the transonic flight Mach number region from 0.9 to 1.1, where the ejector thrust ratio decreased to as low as 0.945 for an ejector corrected weight-flow ratio of 0.105.

Mihaloew, James R.↗