RockSat-C 2012 CoDR Zero Tilt Conceptual Design Review Frostburg State University Michael Stevenson,...
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Transcript of RockSat-C 2012 CoDR Zero Tilt Conceptual Design Review Frostburg State University Michael Stevenson,...
RockSat-C 2012
CoDR
Zero TiltZero TiltConceptual Design ReviewConceptual Design Review
Frostburg State UniversityMichael Stevenson, Mayowa Ogundipe, Subhasis Ghosh, Andrew Huntley, Derek Val-Addo, Jared Hughes, Sean Hughes, Daniel Gares, Tyler Lemmert, Kaetie CombsOctober 3, 2011
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RockSat-C 2012
CoDR
Mission OverviewMission 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
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RockSat-C 2012
CoDR
Mission OverviewMission Overview
We plan to:◦ Counteract the platform spin◦ Orient the platform parallel to the earth’s surface at all
times◦ Confirm the altitude reading using an accelerometer on
our platform
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 in order to collect data.
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RockSat-C 2012
CoDR
Mission Overview: Theory and Mission Overview: Theory and ConceptsConcepts
The underlying theory and concepts:
negative feedback control systems concepts of torque and centripetal force Micro electromechanical systems (MEMS) Electromagnetic field theory Real-Time Systems Theory (for multi-
tasking)
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RockSat-C 2012
CoDR
Past ResearchPast Research
Drexel University’s 2011 project incorporating a despun platform. The Results have not been published but the CDR offered evidence of successful trial runs at large stress.
We plan to elaborate on Drexel’s design. Modifying and improving the despun platform design in our project.
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RockSat-C 2012
CoDR
Mission Overview: Mission Mission Overview: Mission RequirementsRequirements
Mission Objectives: Counter the spin of the rocket during flight. Keep a level surface to earth using our conceptual
design. Prove successful by comparing the acceleration data
from our zero tilt platform with that from the plate.
Minimum success criteria Our main goals as the Zero Tilt team is to receive
results indicating that we achieved zero tilt and confirming the altitude.
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crestock.com
RockSat-C 2012
CoDR
Mission Overview: Expected Mission Overview: Expected ResultsResults
What we expect:
Determine whether we were successful in keeping our platform level based on data analysis. (within a 10°tolerance)
Find altitude within a reasonable tolerance again based on the data we collect.
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Zero Tilt ConOps
t ≈ 1.3 min Altitude: 75
km
t ≈ 15 min
Splash Down
t ≈ 1.7 min
Altitude: 95 km
-G switch triggered
-All systems on
-Initialize despin system
-Initialize zero tilt system based on magnetometer.
t = 0 min
t ≈ 4.0 min
Altitude: 95 kmApogee
t ≈ 2.8 min Altitude: ≈115 km
t ≈ 4.5 min
Altitude: 75 km
t ≈ 5.5 min
Chute Deploys
-use the position of the zero tilt plate as initial value for the gyroscope sensor.-switch to gyro input for zero tilt system.
RockSat-C 2012
CoDR
Component OverviewComponent Overview We will be using the three axis high G
accelerometers that the RockON plates used.
Improved AVR comparable to the one previously used.
Novel design for Tilt removal. A despinning concept similar to previous
projects will be used This will provide a stable reference to remove tilt.
Gyroscope Sensor Sampling Frequency 2000 SPS Error < 1%
Magnetometer ±1100 µT or 11 Gauss 2000 samples/second
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RockSat-C 2012
CoDR
Our Preliminary DesignOur Preliminary Design
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Motor and gear tan to
rotating axle..
Intial design for holding
Zero tilt platform.
Despun platform
processor and gyroscope.
Servo motor attached to
shaft..
Zero Tilt processor,
magnetometer, and
gyroscope.
Power Sources: on plate and
under Zero tilt platform.
RockSat-C 2012
CoDR
Zero tilt platform conceptual Zero tilt platform conceptual referencereference
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Electrical Layout of Tilt Electrical Layout of Tilt Platform Platform
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GyroscopesMicrocontroller
Accelerometer
Tilt Servo
Spin Servo
Flash Memory
G Switch RBF SwitchPower
Electrical Layout of Despun Electrical Layout of Despun PlatformPlatform
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Microcontroller
Accelerometer
Gyroscopes
Motor with tachometer for feedback
Motor controller
PowerG Switch RBF Switch
RockSat-C 2012
CoDR 14
Initial Conceptual ViewInitial Conceptual View
RockSat-C 2012
CoDR 15
Tilt Mechanism Tilt Mechanism DemonstrationDemonstration
RockSat-C 2012
CoDR
Organization Organization
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Team Organizational Chart
Groups Members
Zero Tilt Design Group Mayowa Ogundipe (programming, circuit schematics)
Jared Hughes (magnetometer initialization)
Michael Stevenson (gyroscope initialization, circuit schematics)
Mayowa Ogundipe (programming, control systems)
Andrew Huntley (programming, schematics)
Derek Val-Addo (programming, schematics)
Sean Hughes (motor, gear ratios, physical layout)
Subhasis Ghosh (servo motors, physical layout)
Daniel Gares (Total Design compilation-mechanics)
Tyler Lemmert (Total Design compilation-mechanics)
Kaetie Combs(Project Management, Design)
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Our Tentative Schedule/RockSat Schedule
7/26/2011 RockSat Payload User‘s Guide Released
9/9/2011 Deadline to submit Intent to Fly Form
9/12/2011 Start Tutorials on RockOn Project and Launch
9/14/2011 Initial Down Selections Made
10/3/2011 Finish Tutorials on RockOn Project and Launch
10/3/2011 Start Identifying Electronics Including Processors and Sensors
10/3/2011 Conceptual Design Review (CoDR) Due
10/4/2011 Conceptual Design Review (CoDR) Teleconference
10/10/2011 Start Wireless Sensor Networks/Complete Design/Build and Test Cct
10/17/2011 Earnest Payment of $1,000 Due
10/17/2011 Online Progress Report 1 Due
10/26/2011 Preliminary Design Review (PDR) Due
10/27/2011 Preliminary Design Review (PDR) Teleconference
11/14/2011 Online Progress Report 2 Due
11/28/2011 Start Testing
11/30/2011 Critical Design Review (CDR) Due
12/1/2011 Critical Design Review (CDR) Teleconference
12/12/2011 Last Day of the Fall Semester
1/9/2012 Final Down Select—Flights Awarded
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Our Tentative Schedule/RockSat Schedule
1/25/2012 First Day of the Spring Semester
1/30/2012 Online Progress Report 1 Due
2/3/2012 First payment due
2/13/2012 Individual Subsystem Testing Reports Due
2/14/2012 Individual Subsystem Testing Reports Teleconference
3/12/2012 Online Progress Report 2 Due
4/2/2012 Payload Subsystem Integration and Testing Report Due
4/2/2012 Payload Subsystem Integration and Testing Report Teleconference
4/6/2012 Final payment due
4/15/2012 RockSat Payload Canisters Sent to Customers
4/23/2012 First Full Mission Simulation Test Report Presentation Due
4/24/2012 First Full Mission Simulation Test Report Presentation Telecon
5/7/2012 Weekly Teleconference 4
5/14/2012 Weekly Teleconference 5
5/21/2012 Weekly Teleconference 6
5/28/2012 Launch Readiness Review Presentations
5/29/2012 Launch Readiness Review (LRR) Teleconference
6/4/2012 Weekly Teleconference 7 (FMSTR 2)
6/11/2012 Weekly Teleconference 7
6/6/2012 Weekly Teleconference 8 (LRR)
6/10/2012 Weekly Teleconference 9
6/142012 Visual Inspections at Refuge Inn
06-(15-18)-2012 Integration/Vibration at Wallops
6/20/2012 Presentations to next year‘s RockSat
6/21/2012 Launch Day
RockSat-C 2012
CoDR
ManagementManagement
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Monetary budget:
2000 for Equipment 7000 for capsule
Team mentors:
•Adam Rexroad (RockOn participant)•Brett Dugan (RockOn participant)
Team Advisor:
•Dr. Eltayeb (Faculty)
RockSat-C 2012
CoDR
ConclusionConclusionZero Tilt’s goal is to provide a stable
environment throughout the flight of a Sounding Rocket for future experimentation.
Our main concern at the outset is the implementation of the RBF jumper on our tilt platform.
Plan for where you will take your design from here?◦ We need to investigate initial conditions for our
tilt gyroscope◦ Our plan is to use the magnetometer to set initial
conditions but we need to research the feasibility of this further.
◦ We look forward to presenting our preliminary design in the next month.
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