Approximations to the reliability of phased missions
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A system whose configuration (block diagram or fault tree) changes during consecutive time periods (phases) performs a 'phased mission.' Recently, Esary and Ziehms have shown that any multi-phase mission can be transformed into an equivalent, synthetic, single-phase system, and thus that the phased mission problem can in principle be solved by standard reliability methods. The author employs these ideas here to study approximations to mission reliability and to develop an algorithm which may be of practical interest. In addition, he extends the reliability calculus of Rubinstein, and Esary and Hayne, based on an approximate hazard transform, to phased missions. It is shown how this extended calculus can be used in situations where phases are not of known fixed duration
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NPS Report NumberNPS55Ey75091
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Bell, Merlin Gene (Monterey, California. Naval Postgraduate School, 1975-12);In a phased mission the functional organization of the system changes at selected times which mark the boundaries of the phases of the mission. Existing methods for analysis of phased missions are modified and extended ...
Keeble, Trenton G. (1987-09);Fault tree analysis, which has proved to be a useful analytical tool for the reliability and safety analysis of complex systems, is applied to the Naval Postgraduate School Mini-Satellite (ORION). A general background ...
Esary, J.D.; Ziehms, H. (Monterey, California. Naval Postgraduate School, 1975-02); NPS55Ey75021In a phased mission the relevant system configuration (block diagram or fault tree) changes during consecutive time periods (phases). Many systems are required to perform phased missions. A classic example is a space ...