A POF model for short fiber segments in avionics applications

Plastic Optical Fibres (POF) have now been a well-established media for transporting high-speed at low cost in short distance communications systems, and avionics is the latest segment where these fibers are becoming an important factor. In fact, the POF''s flexibility and ease of installation make this fiber a great option for the replacement by fiber of some of the existing aircraft data links. We propose a new model for short fiber links that are suitable for plane''s systems that involve a lot of connectors; the model is built around two important properties, namely, power transfer among modes and attenuation. The model expands on our previous work on the subject and is based on detailed experimental measurements for various fiber types and lengths

Space Station Freedom data management system growth and evolution report

The Information Sciences Division at the NASA Ames Research Center has completed a 6-month study of portions of the Space Station Freedom Data Management System (DMS). This study looked at the present capabilities and future growth potential of the DMS, and the results are documented in this report. Issues have been raised that were discussed with the appropriate Johnson Space Center (JSC) management and Work Package-2 contractor organizations. Areas requiring additional study have been identified and suggestions for long-term upgrades have been proposed. This activity has allowed the Ames personnel to develop a rapport with the JSC civil service and contractor teams that does permit an independent check and balance technique for the DMS

Assessment of avionics technology in European aerospace organizations

This report provides a summary of the observations and recommendations made by a technical panel formed by the National Aeronautics and Space Administration (NASA). The panel, comprising prominent experts in the avionics field, was tasked to visit various organizations in Europe to assess the level of technology planned for use in manufactured civil avionics in the future. The primary purpose of the study was to assess avionics systems planned for implementation or already employed on civil aircraft and to evaluate future research, development, and engineering (RD&E) programs, address avionic systems and aircraft programs. The ultimate goal is to ensure that the technology addressed by NASa programs is commensurate with the needs of the aerospace industry at an international level. The panel focused on specific technologies, including guidance and control systems, advanced cockpit displays, sensors and data networks, and fly-by-wire/fly-by-light systems. However, discussions the panel had with the European organizations were not limited to these topics

Definition of avionics concepts for a heavy lift cargo vehicle. Volume 1: Executive summary

A cost effective, multiuser simulation, test, and demonstration facility to support the development of avionics systems for future space vehicles is examined. The technology needs and requirements of future Heavy Lift Cargo Vehicles (HLCVs) are analyzed and serve as the basis for sizing of the avionics facility, although the lab is not limited in use to support of HLCVs. Volume 1 provides a summary of the vehicle avionics trade studies, the avionics lab objectives, a summary of the lab's functional requirements and design, physical facility considerations, and cost estimates

System data communication structures for active-control transport aircraft, volume 2

The application of communication structures to advanced transport aircraft are addressed. First, a set of avionic functional requirements is established, and a baseline set of avionics equipment is defined that will meet the requirements. Three alternative configurations for this equipment are then identified that represent the evolution toward more dispersed systems. Candidate communication structures are proposed for each system configuration, and these are compared using trade off analyses; these analyses emphasize reliability but also address complexity. Multiplex buses are recognized as the likely near term choice with mesh networks being desirable for advanced, highly dispersed systems

Aeronautical engineering: A continuing bibliography with indexes (supplement 238)

This bibliography lists 458 reports, articles, and other documents introduced into the NASA scientific and technical information system in March, 1989. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

1997 Graduate Student Researchers Program

In 1980, NASA initiated the Graduate Student Research Program (GSRP) to cultivate additional research ties to the academic community and to support a culturally diverse group of students pursuing advanced degrees in science and engineering. Eligibility requirements for this program are described, and program administrators are listed. Research areas are detailed for NASA Headquarters and all Research and Flight Centers

Transmission performance of plastic optical fibers designed for avionics platforms

Plastic optical fibers (POFs) have been proposed and implemented in the avionics environment lately, and temperature is naturally a big factor that can affect their performance in those platforms. We present an experimental characterization of the transmission properties of POFs comparing the performance of standard fibers with that of fibers designed to sustain high temperatures, such as those on avionics platforms. We tested different step-index 1-mm poly(methyl methacrylate) single-core and multicore fibers. Frequency response, bit error rate (BER), attenuation, and output power distribution were measured for each fiber type at room temperature. In addition, BER and fiber attenuation were monitored as a function of temperature, intentionally exceeding the temperature limits to obtain the true temperature ranges and to assess the performance penalty. The same properties were obtained for the overheated fibers and compared to those for nonheated fibers of the same type to reveal permanent performance degradation

Aeronautical Engineering: A continuing bibliography with indexes

This bibliography lists 529 reports, articles, and other documents introduced into the NASA Scientific and Technical Information System in May 1980