treads semester review dec. 14, 2007. objectives assess and communicate current design identify...
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TREADSSemester Review
Dec. 14, 2007
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Objectives• Assess and Communicate Current Design
• Identify interfaces
• Approve the System Requirement Specification
• Formalize the design
• Obtain approval to purchase parts and begin assembly
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Agenda
• Mission Concept of Operations
• Subsystem Briefs– Structures
• Design, Analysis. Vibration Analysis
– Thermal Analysis– DIB/SMB– Power System
• Architecture, Power Budget
– Communications
• Schedule
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Mission Statement• Provide mission Objectives
• Why are you doing this?
• At a high level, how will you do this.
• What are you major mission requirements or limitations
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Falcon 1 User’s Guide, SpaceX
Launch TREADS Operations (1 Year)
Concept of Operations
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Ground Ops S/C Ops
LV Activities
Laun
chP
rimar
y P
aylo
adR
elea
se
TRE
AD
S P
ower
On
Sec
onda
ry P
aylo
adR
elea
seTe
rtiar
y P
aylo
adR
elea
se
Mis
sion
Sta
rtFC
Boo
t Up
Sys
tem
Che
ckou
t
Exec. DUT Test(s)
Data Downlink
Charge Batteries
Customer Feedback
Exec. ScheduleSchedule Uplink
Nominal Timeline
Nom
inal
Ope
ratio
ns
Firs
t Gro
und
Con
tact
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System Level Review• Functional Block Diagram Examples
• Major System level capabilities and requirements.
• Give enough context for the sub-system sections to make sense.
• Full System review at the end– Mass, Volume…..
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•List major requirements and capabilities.
•List major components.
•List major concerns.
Sub Systems Review
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•Total System Level requirement Compliance
•Power, Mass, Volume
Systems Review
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Mass budget Mass(kg)
Test Flight box (box design to accommodate 4 C6713) 3.54 DUTs 2Flight computer 0.5Heater, screws, bolts etc.. 1
Comm box 3Antenna 1RF feed to antenna 0.2antenna deployment structure 2Power 1.5Power board 0.3Batteries 1.3Solar pannels (18.7*19in) 2Wiring harness 1Total 19.3Margin 3.86Total 23.16
Acceptable Mass Budget
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Electronics Risks
5
PW3
4
COMM1 PW2
3
DIB1
2
ASS1SMB1, PW1
1
1 2 3 4 5
Severity
Likelihood
Subsystem Severity Rating Likelihood Rating Risk Rating DescriptionSMB1 5 1 5 SMB does not work/irreparable damagePW1 5 2 10 Not enough power to last the night (<6W)PW2 4 1 4 power system cannot supply power due to component failure due to reasons other than radiationPW3 5 2 10 battery failure DIB1 3 3 9 DIB failure!
COMM1 4 3 12 see note 1ASS1 2 2 4 component lead time is high and/or cost very high
Risks
12345
12345 > 90% Certain
Very rare, < 25% Certain> 25% Certain> 50 % Certain> 75% Certain
Significant reduction in capabilityMay cause mission failure
Mission-killer: cannot complete mission
Likelihood*
ScalesSeverity
Minimal, will not jepardize missionMay delay mission success