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CDF-UM-001 Iss2Rev1
CDF-UM-01
issue 2 revision 1
Date: 23/01/03
Page 4 of 48
3.8.1
DATA EXCHANGE MACROS............................................................................................................................. 32
3.8.1.1
NEW INPUTS AND OUTPUTS................................................................................................................. 33
3.8.2
OVERALL DATA EXCHANGE PROCESS ...................................................................................................... 33
3.8.2.1
THE DATA EXCHANGE............................................................................................................................ 33
3.8.2.2
STEPS TO THE PROCESS ......................................................................................................................... 33
4
MODES OF OPERATION AND MECHANICAL STATES ...............................................35
4.1
4.1.1
4.1.2
4.1.3
4.2
5
SPACECRAFT MODES OF OPERATION.........................................................................................................35
SUMMARY OF METHOD .................................................................................................................................... 35
DEFINING SYSTEM LEVEL MODES............................................................................................................... 35
DESIGN CASES ....................................................................................................................................................... 38
MECHANICAL CHANGES - EVENTS ................................................................................................................41
MARGIN PHILOSOPHY.........................................................................................................43
5.1
MASS MARGINS .........................................................................................................................................................43
5.1.1
EQUIPMENT MARGINS ....................................................................................................................................... 43
5.1.2
SUB-SYSTEM MARGINS..................................................................................................................................... 43
5.1.3
HIDDEN MARGINS................................................................................................................................................ 44
5.1.4
SYSTEM MARGIN.................................................................................................................................................. 44
5.1.5
IMPLEMENTATION IN THE MODEL .............................................................................................................. 44
5.1.5.1
SUB-SYSTEM LEVEL ................................................................................................................................ 44
5.1.5.2
EQUIPMENT LEVEL .................................................................................................................................. 45
5.1.5.3
TOTAL MARGIN.......................................................................................................................................... 45
6
ABBREVIATIONS AND ACRONYMS .................................................................................46
7
REFERENCES .........................................................................................................................47