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Unformatted text preview: ed system integration. Conceptual
system integration takes place in all phases of the
project life cycle. That is, when a design approach
has been selected, the approach is verified by
"unwinding the process" to test whether the
concept at each physical level meets the
expectations and requirements. Physical integration is accomplished during Phase D. At the finer
levels of resolution, pieces must be tested,
assembled and/or integrated, and tested again.
The system engineer's role in cludes the
performance of the delegated management du ties,
such as configuration control and overseeing the
integration, verification, and validation process.
The purpose of verification of subsystem
integration is to ensure that the subsystems
conform to what was designed and interface with
each other as expected in all re spects that are
important: mechanical connections, effects on
center of mass and products of inertia,
impedance and voltage, power con sumption, data
flow, and so on. Validation consists of ensuring
that the interfaced subsystems achieve their
intended results. While validation is even more
important than verification, it is usually much more
difficult to accomplish.
Perform the Mission. Eventually, the system is
called upon to meet the need or seize the
opportunity for which it was designed and built.
The system engineer continues to perform a
variety of supporting functions, depending on the
nature and duration of the mission. On a large
project such as Space Sta tion Alpha, some of
these continuing functions include the validation of
system effectiveness at the operational site,
overseeing the maintenance of configuration and
logistics documentation, overseeing sustaining
engineering activities, compiling development and
operations "lessons reamed" documents, and, with
the help of the specialty engineering disciplines,
identifying product improvement opportunities. On
smaller systems, such as a Spacelab payload, only
the last two may be needed. NASA Systems Enginee...
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