Individual Subsystem Testing Report

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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 ODonnell, Ian Cuddahee, Michael Young,
  David Wall
• February 13 2012

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Mission Overview

• Mission Statement Zero Tilts 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 earths
  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 multi-tasking

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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
Despun System
Power System
shoponline2011.com
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Power Subsystem (Despun)
Power Supply 9 volt Lithiums 24 Volt Total
Flash Memory
Voltage Regulator 5 to 3 volts
Voltage Regulator 24 to 5 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
Gyroscope
Voltage Regulator 24 to 6 volts
Voltage Regulator 24 to 5 volts
Atmega 32 Processor
Spin Motor
Tilt Motor
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 ODonnell,
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 ODonnell, 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 gs 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) Operating Voltage(V) Max Operating Voltage number Total Current drawn(mA/H) 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
Flash memory AT26DF161A 5 2.7-3.6 3.6 2 10 0.036
Motor 2 HS145CR 150 4.8-6 6 1 150 0.9
Motor 0 3268...BX4 SC 2000 24 24 1 2000 48
Motor 1 HS-5245MG 230 4.8-6 6 1 230 1.38



Total 2421.3 50.46191

Current provided Weight Voltage Total Batteries
Lithuim Batteries 2700-3400mA/hr 15 1.5 16
Alkaline 1800-2600mA/hr 23 1.5 16

ENERGIZER LA522 1000 mA Continous Current 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_id153
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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.