treads semester review dec. 14, 2007. objectives assess and communicate current design identify...
TRANSCRIPT
TREADSSemester Review
Dec. 14, 2007
Objectives• Assess and Communicate Current Design
• Identify interfaces
• Approve the System Requirement Specification
• Formalize the design
• Obtain approval to purchase parts and begin assembly
Agenda
• Mission Concept of Operations
• Subsystem Briefs– Structures
• Design, Analysis. Vibration Analysis
– Thermal Analysis– DIB/SMB– Power System
• Architecture, Power Budget
– Communications
• Schedule
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
Falcon 1 User’s Guide, SpaceX
Launch TREADS Operations (1 Year)
Concept of Operations
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
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…..
•List major requirements and capabilities.
•List major components.
•List major concerns.
Sub Systems Review
•Total System Level requirement Compliance
•Power, Mass, Volume
Systems Review
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
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