Abstract
For systems with long lifespans, a critical element of logistical support is the ability to accomplish system modifications. Such modifications are required both to enhance long term system supportability and to take advantage of new performance opportunities. However, decisions concerning modification alternatives are fraught with tradeoffs among multiple criteria, making selection of a course of action problematic.
This paper describes a structured method applied to such a case for NASA's space shuttle auxiliary power unit (APU) system. APU redesign was being considered both to reduce servicing requirements and to facilitate inclusion of electromechanical actuation. A large set of candidate systems was synthesized by combining possible alternatives for the various APU system components. Four primary decision criteria were identified with relative weights which varied based on the level of criteria achievement. Since the criteria were not directly measurable, candidate system performance was modeled based on preliminary data estimates. To facilitate consistent evaluation of the large set of alternatives based on the numerous relevant data estimates, a structured multi-criterion design decision method was demonstrated.
The results revealed predominant themes affecting the preferred designs. In addition, the decision process itself produced useful insights for comparable decisions.
Original language | American English |
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Journal | Annals of the Society of Logistics Engineers |
Volume | 2 |
State | Published - 1992 |
Disciplines
- Business
Keywords
- Auxiliary power unit
- Logistical support
- NASA
- Space shuttle