RockSat-C 2012 CoDR Zero Tilt Conceptual Design Review Frostburg State University Michael Stevenson, Mayowa Ogundipe, Subhasis Ghosh, Andrew Huntley, Derek Val-Addo, Jared Hughes, Sean Hughes, Daniel Gares, Tyler Lemmert, Kaetie Combs October 3,

RockSat-C 2012 CoDR 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 2

RockSat-C 2012 CoDR Mission 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. 3

RockSat-C 2012 CoDR Mission Overview: Theory and Concepts 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) 4

RockSat-C 2012 CoDR Past 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. 5

RockSat-C 2012 CoDR 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 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. 6 crestock.com

RockSat-C 2012 CoDR Mission Overview: Expected Results 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. 7

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 km Apogee 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 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 9

RockSat-C 2012 CoDR Our Preliminary Design 10 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 reference 11

Electrical Layout of Tilt Platform 12 Gyroscopes Microcontroller Accelerometer Tilt Servo Spin Servo Flash Memory G Switch RBF Switch Power

Electrical Layout of Despun Platform 13 Microcontroller Accelerometer Gyroscopes Motor with tachometer for feedback Motor controller Power G Switch RBF Switch

RockSat-C 2012 CoDR 14 Initial Conceptual View

RockSat-C 2012 CoDR 15 Tilt Mechanism Demonstration

RockSat-C 2012 CoDROrganization 16 Team Organizational Chart GroupsMembers Zero Tilt Design GroupMayowa 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)

17 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

18 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/ 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 CoDRManagement 19 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 CoDRConclusion Zero 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. 20