Download Team Name - University of Colorado Boulder

Individual Subsystem
Testing Report
Zero Tilt
Frostburg State University
Kaetie Combs, Francisco Diaz , Sean Hughes, Jared Hughes, Andrew Huntley, Subhasis Ghosh,
Mayowa Ogundipe, Derek Val-Addo, Michael Stevenson, Shaun O’Donnell, Ian Cuddahee,
Michael Young, David Wall
February 13 2012
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Mission Overview
• Mission Statement: Zero Tilt’s goal is to
provide, for the first time, a stable
environment throughout the flight of a
Sounding Rocket via two concurrent
objectives:
– Tilt correction system
– Despun platform system
whs.mil
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Mission Objectives
• We plan to:
– Counteract the platform spin
– Orient the platform parallel to the earth’s surface at all times
• We expect to prove that it is possible to correct spin,
tilt, and determine the altitude based upon a level
reference.
• This could benefit any scientific experiment that
requires stabilization
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Mission Objectives: Theory and Concepts
• The underlying theory and concepts:
– negative feedback control systems
– concepts of torque and centripetal force
– Micro electromechanical systems
(MEMS)
– Real-Time Systems Theory (for multitasking
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Mission Overview: Mission Requirements
• Mission Objectives:
– Counter the spin of the rocket during flight.
– Keep a level surface to earth using our conceptual
design.
– Prove successful by using the stored gyroscope
output and the feedback from various motors.
• Minimum success criteria
– Our main goals as the Zero Tilt team is to receive
results indicating that we achieved zero tilt for the
flight of a sounding rocket.
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Functional Block Diagrams
Zero Tilt
System
Tilt
System
Power
System
Despun
System
shoponline2011.com
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Power Subsystem (Despun)
Power Supply:
9 volt Lithiums
24 Volt Total
Flash Memory
Voltage
Regulator
24 to 5 Volts
Voltage
Regulator
5 to 3 volts
De-spin
Motor
Atmega 32
Processor
High G
Accelerometer
High G
Accelerometer
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Power Subsystem (Tilt)
Power Supply:
9 volt Lithiums
24 Volt Total
Flash Memory
Voltage
Regulator
24 to 3 volts
Voltage
Regulator
24 to 6 volts
Spin
Motor
Voltage
Regulator
24 to 5 volts
Tilt
Motor
Gyroscope
Atmega 32
Processor
Low G
Accelerometer
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Despun System
High G
Accelerometer
Flash Memory
Atmega 32
Processor
High G
Accelerometer
Motorcontroller/Driver
Despun Motor
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Tilt System
Spin Motor
Flash Memory
Atmega 32
Processor
Tilt Motor
Low-G
Accelerometer
Gyroscope
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Changes from CDR
• Decided to consider a new servo motor that has lower
power requirements, a faster response time, and more
torque.
• We are running power wires from slip ring directly
onto board due to our decision to limit our turn radius
on the tilt platform.
• Due to Servo Considerations some minor design
changes are being made for placement on Tilt
platform.
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Program Management and Team Updates
Pictured from left to right: Mayowa Ogundipe, Subhasis Ghosh, Jared Hughes, Ian Cuddahee, Sean Hughes
Derek Val-Addo, Andrew Huntley, Kaetie Combs, Michael Stevenson, Francisco Diaz, Michael Young,
Dr. Mohammed Eltayeb, Shaun O’Donnell, David Wall
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Schedule Update
• We are on schedule electrically and are waiting on the fabrication
of mechanical parts to finish testing.
• We have shifted the completion of the mechanical tests later
because of machining time.
• We are focusing our efforts on completing the electrical elements
so that we know they will be reliable on the mechanical layout.
• Our main concern is completing our mechanical fabrication so we
can finish testing.
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Subsystem Overview
• Subsystems
– Electrical
• Discussion by Mayowa Ogundipe, and Derek Val-Addo
– Power
• Discussion by Andrew Huntley, Jared Hughes, and Sean Hughes
– Mechanical
• Discussion by Shaun O’Donnell, and David Wall
nisd.net
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Electrical Subsystem Update
• Status
– What is complete/what has been tested?
– What has not yet been checked out?
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Electrical Subsystem Update (Continued)
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Electrical Subsystem Update
• What were the results?
– We were able to collect gyroscope and accelerometer data. (dps for
gyroscope, and voltage for the accelerometer)
– We were able to convert dps to degrees for the Gyroscope and voltage
to g’s for the accelerometer.
– We were able to program the servo motor to react to changes in
degree measure read from the gyroscope, either positive or negative.
lochnessproject.org
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Power Subsystem Update
• Status
– What is complete/what has been tested?
– What has not yet been checked out?
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Power Subsystem Update
Power Requirements
Device
maximum
Current
drawn(mA)
Max Operating
Operating Voltage(V) Voltage
Total Current
drawn(mA/H)
number
Maximum power
dissapation(W)
Atmega 32
1.1
2.7-5.5
5.5
2
2.2
0.0121
High-G Accelerometer
ADXL278
2.9
5(+-5%)
5
2
5.8
0.029
Low-G Accelerometer
ADXL203
1.1
5
5
1
1.1
0.0055
Motor Controller TB6585FG
14
4.7
4.7
1
14
0.0658
Voltage Regulator MAX3379
0.3
1.2-5.5
5.5
7
2.1
0.01155
Gyroscope L3G3200D
6.1
2.4-3.6
3.6
1
6.1
0.02196
5
2.7-3.6
3.6
2
10
0.036
150
4.8-6
6
1
150
0.9
2000
24
24
1
2000
48
230
4.8-6
6
1
230
1.38
2421.3
50.46191
Flash memory AT26DF161A
Motor 2 HS145CR
Motor 0 3268...BX4 SC
Motor 1 HS-5245MG
Total
Lithuim Batteries
Alkaline
ENERGIZER LA522
Current
provided
27003400mA/hr
18002600mA/hr
1000 mA
Continous
Current
Weight
Voltage
Total Batteries
15
1.5
16
23
1.5
16
33.9 grams
9
6
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Mechanical Subsystem Update
•
Status
– What is complete/what has been tested?
– What has not yet been checked out?
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Mechanical Subsystem Update
• Discussion of current mechanical objectives including machining
schedule, tilt platform construction, and slip ring mounting
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Plan for Subsystem Integration
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Lessons Learned
• Subsystem testing requires rigid time restraints and an understanding
of the time required to complete tasks. Taking into account setbacks and
off-ramps. Designing a system would benefit also from an understand as
to how it will be constructed. Engineering tasks are best approached by
assigning specific tasks and deadlines to groups so that any
dependencies can be accounted for.
• If we started this project over we would ensure more carefully that the
pieces selected could perform their designated tasks. We would also
assign more ambitious deadlines and complete dependent items in a
more time efficient manner.
• So far, by designating tasks we have been able to work ahead in certain
areas and share discoveries with the entire team. We have class
discussions and demonstrations that function as learning tools for all of
us.
http://sparetimeuniversity.com/?page_id=153
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Conclusions
In conclusion we hope to get up to speed
with our mechanical subsystem. We intend to
continue work with the electrical system and
iron out Flash memory requirements and PCB
board layouts so they will be ready for the
Systems Integration Testing. We need to more
extensively test power and ensure that our new
selected batteries can supply the current and
voltage needed.
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