Engineering topics
Publications and source records attributed to Harris, J. A..
Mars pathfinder successfully landed at Ares Vallis on July 4, 1997 and returned 2.3 Gbits of information during 3 months of surface operations of a lander, rover, three science instruments, engineering sensors and technology experiments.
The Engineering Analysis Subsystem Environment (EASE) is under development at the JPL with a view to prospective small and large space missions. EASE is a modular multimission/multisystem architecture for spacecraft analysis that encompases monitoring and sequence support; its collection of software analysis modules is specific to a given mission, thereby easily accommodating mission scale. An EASE subsystem analysis module can be developed in modular program sets or packages, and a level of automation can then be introduced within such sets to achieve intramodule automation.
Commercially available alloy, Incoloy 903, is candidate for various high-pressure, high-temperature applications. Recent study of properties in hydrogen and helium atmospheres under extreme environments indicates that alloy can be degraded by gaseous hydrogen, particularly at elevated temperatures. Study also reports that water vapor added to hydrogen environments causes reductions in low-cycle fatigue life of material.