ELECTRICAL POWER SYSTEM PERFORMANCE

The ETARA system was written to evaluate the performance of the Space
Station Freedom Electrical Power System, but the methodology and software
can be modified to simulate any system that can be represented by a block
diagram. ETARA is an interactive, menu-driven reliability, availability,
and maintainability (RAM) simulation program. Given a Reliability Block
Diagram representation of a system, the program simulates the behavior of
the system over a specified period of time using Monte Carlo methods to
generate block failure and repair times as a function of exponential
and/or Weibull distributions.

ETARA 3.3 is written in APL2 for IBM PC series computers or compatibles
running MS-DOS and the APL2 interpreter. Hardware requirements for the
APL2 system include 640K of RAM, 2Mb of extended memory, and an 80386 or
80486 processor with an 80x87 math co-processor. The standard distribution
medium for this package is a set of two 5.25 inch 360K MS-DOS format
diskettes. A sample executable is included. ETARA was developed in 1990
and last updated in 1991.

NASA's Software Technology Transfer Center
COSMIC, The University of Georgia
382 East Broad St, Athens, GA 30602-4272
(706) 542-3265;  Fax: (706) 542-4807
Internet Email: service@cossack.cosmic.uga.edu

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