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Systems Engineering and Software Specialists ABACUS   AI   PROJECTS   PRESENTATION Abacus has applied AI techniques to many real-world problems.
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EXTRAJ

The Abacus EXTRAJ system assists Space Shuttle engineers design ascent trajectories for Space Shuttle missions.  It deals with a subset of the overall problem which is a specific portion of the ascent trajectory known as the "throttle bucket."  During the ascent of the shuttle, there is a series of four points in the trajectory during which the shuttle main engines must be throttled back to prevent exceeding the maximum dynamic pressure on the spacecraft.  This series of points when graphed in terms of throttle percentage over time looks like a bucket on the graph, hence the name "throttle bucket."  The throttle bucket in the trajectory varies with each launch, depending on the specific constraints and conditions of the mission.

EXTRAJ utilizes a database of previously successful shuttle trajectories, and selects a trajectory from the database that matches the primary constraints of the mission being planned.  Then it modifies the throttle bucket of that trajectory for the specific conditions of the planned launch.  The procedure followed by the expert system is essentially the same as that which engineers have used to design trajectories manually.


Space Shuttle Ascent Trajectory "Throttle Bucket"
The Abacus EXTRAJ system assists Space Shuttle engineers design ascent trajectories for Space Shuttle missions.


Space Shuttle Ascent Trajectory Profile
The Abacus EXTRAJ system assists Space Shuttle engineers design ascent trajectories for Space Shuttle missions.
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     Overview


  1. AIBUS
  2. AICIM
  3. AICOURSE
  4. AIELEC
  5. AITOOLS
  6. ALSES
  7. ESI
  8. ESSGRAPH
  9. ETSS
10. EXAUDIT
11. EXCABL
12. EXDATA
13. EXDCP
14. EXDIAG
15. EXFAULT
16. EXIMU
17. EXMIS
18. EXMISSION
19. EXPANEL
20. EXPDL
21. EXRMS
22. EXTRAJ
23. EXWATCH
24. FICX
25. GDISPO
26. ISMAX
27. METAPACK
28. MMIL
29. NATLAN
30. PIRCS
31. POWERPACKS
32. RBENCH
33. REXPERT
34. SAUDIT
35. SBENCH
36. SCOTTY
37. SHELLTRADE
38. SQUAL
39. SSAI
40. TWELF
41. USER
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