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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