A technical risk management system (TRMS) has been developed for the Fluids and Combustion Facility project which is a facility designed to support microgravity combustion and fluids experimentation aboard the International Space Station Alpha (ISSA). The TRMS incorporates Vitech Corporation's system engineering tool set, CORE, to capture and manage the evolving system design and risk identification, assessment, and abatement activities.

SUMMARYThe Dynamic Engine ANalysis program, DEAN, is a FORTRAN code implemented on the IBM/370 mainframe at NASA Lewis Research Center for digital simulation of turbofan engine dynamics. DEAN is an interactive program which allows the user to simulate engine subsystems as well as a full engine systems with relative ease. The non-linear first order ordinary differential equations which define the engine model may be solved by one of four integration schemes, a csecond order Runge-Rutta, a fourth order Runge-Kutta, an Adams Predictor- LOCorrector, or Gear's method for stiff systems. The numerical data generated by the model equations are displayed at specified intervals between which the user may choose to modify various parameters affecting the model equations and transient execution. Following the transient run, versatile graphics capabilities allow close examination of the data.DEAN's modeling procedure and capabilities are demonstrated in this paper by generating a model of a simple compressor rig.

NASA's Next Generation Launch Technology (NGLT) program recently funded studies of the Gryphon launch architecture. Gryphon combines existing technologies with moderate propulsion advancements and a design for operations approach into a unique, aircraft-like architecture. A joint NASA/industry team was assembled by NGLT's Systems Analysis Project to assess the Gryphon concept and produce a conceptual design to specific performance, reliability, safety, and life cycle cost goals while meeting NASA and DoD requirements.

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