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1Colorado Space Grant Consortium
Virginia Space Grant Consortium
RockOn...
A Sounding Rocket Payload Workshop
Colorado & Virginia Space Grant Consortium
Mission Initiation Conference
February 21, 20082:00 PM EST
RockOn...
A Sounding Rocket Payload Workshop
Colorado & Virginia Space Grant Consortium
Mission Initiation Conference
February 21, 20082:00 PM EST
2Colorado Space Grant Consortium
Virginia Space Grant Consortium
Presentation Overview
1. Workshop Concept
2. Introduction and Background
3. Workshop Kit Concept
4. Concept of Operations
5. Stacked Kit Configuration
6. RocketSat Can Configuration
7. Can to Launch Vehicle Integration
8. Testing
9. Special Requests
10. Summary of Final Configuration
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1. Workshop Concept:
- Faculty and students come to Wallops for a six day hands-on workshop
- In teams of 3-4, they build a sounding rocket payload (RocketSat) from a kit
- All payloads are identical
- Payloads integrated into a standard container and integrated on 4th day
- Payloads are launched on a single rocket on the 6th day
- Workshop is held annually
- Past participants come back to fly their own payloads in standard container for a set price (some may fly on future workshop rockets to help pay cost of workshop launch)
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1. Workshop Concept:
- RockOn workshop is based on the successful Boulder BalloonSat workshop
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1. Workshop Concept:
- This workshop has been held five times with great participation
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1. Workshop Concept:
- We are expecting similar participation with the RockOn workshop
- The website can be found at…http://spacegrant.colorado.edu/rockon/
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2. Introduction and Background:
RocketSat and Workshop Goals:
1.) Allow students to design payloads that will go into space
2.) More challenging design problem
3.) Unique science opportunities
4.) More demanding hands-on experience
5.) Interdisciplinary team work
6.) Help create a new and standard access to space platform with Wallops
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2. Introduction and Background:
- The workshop kit or RocketSat has been under development and testing since January 2006.
- RocketSat has been develped by undergraduate students from the University of Colorado at Boulder
- RocketSat has flown three times in different configurations
- RocketSat I September 2006- RocketSat II April 2007- RocketSat III June 2007
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RocketSat 1 Objectives:
1.) Easily reproducible payload design (COTS)
2.) Qualitative data description of flight environment with altitude
3.) Science Package:- Geiger Counter- Microwave Detector
- Sensor Package- Temperature sensor- Accelerometers- Pressure sensor
2. Introduction and Background:
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RocketSat 2 Objectives:
1.) Easily reproducible payload design (COTS)
2.) Record detailed flight data:- Video Camera
3.) General environmental sensors:- Temperature- Pressure- Humidity
4.) Structural Loading Data:- Three-axis accelerometer recordings- Strain gauges
- Faculty Sponsored GPS experiment
2. Introduction and Background:
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RocketSat 3 Objectives:
1.) Re-fly all hardware from RSI except microwave sensor and Geiger counter
2.) New Sensors:- Silicon pressure sensor- New Geiger counter- New microwave sensor
2. Introduction and Background:
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3. Workshop Kit:
- No Rocket power needed
- No Telemetry needed
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3. Workshop Kit:
AVR
GeigerCounter
G-Switch
9 Volt Batteries
Z axisAccels.
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3. Workshop Kit:
- Plate material is similar to Lexan
- CG of populated plate is
+ 0.0679 X- 0.0195 Y - 0.0176 Z
- Weight of populated plate is ~1.75 to 2.00 pounds
- Notches for electrical
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Functional Block Diagram
AVR
Temp.Sensor
Geiger Counter
PressureSensor
X and Y Acc.
Z Accel.
Data RetrievalBoard
(not flight)
Flash Memory
9V 9V
In Parallel
VREGS
AVR Output G-Switch
Wallops Activation
Flash Input
Flash Output
Legend
Power
Data
AVR Input
3. Workshop Kit:
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AVR Board – Revision 3:
- ATMega 32L Microprocessor
- 2 MB Flash Memory
- 0-15 Psi Pressure Sensor
- 3-Axis Acceleration
- Temperature Sensor
- In-System-Programming
- Attached Geiger Counter
- 9 Volt Bus
- RBF pin on each kit
- G-switch on each kit
Data Retrieval (not flight)
Z-Axis Acceleration
Main Board
G-Switch
3. Workshop Kit:
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Geiger Counter – Revision 3:
- Addition of Audio Segment to compliment blinking LED
- New Aerosol Urethane based conformal coating (1500V/mil dielectric spec) to prevent coronal discharge
- Digital Output TTL pulse for AVR interface and recording
- Epoxy application to Geiger tube to prevent depressurization blowout of mica window
Geiger Board
3. Workshop Kit:
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T-15 minutes –• Arming Relay ActivatedG-switch and AVR deactivated
T-0 – Liftoff•G-switch and AVR activated•Z-axis accelerometers show a large vertical acceleration•System begins collecting data
T+1 second – •Z-axis accelerations cause memory protection latches to engage•X- and Y-axis accelerometers show constant values due to spin
T+~3 minutes – •Rocket reaches apogee•Z-axis accelerometers read 0 g due to free fall conditions
T+15 minutes – •Rocket lands•Sensors continue to collect data until flash memory is full
Later – Retrieval•Payloads retrieved•AVR continues to operate in low power mode until battery power is exhausted•If power returns, data is not overwritten due to memory protection system
4. Concept of Operations:
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Single Plate w/ Stand-Offs
2nd Plate Clocked and Stacked On
Top of 1st
5. Stacked Configuration:
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Stand-Offs Added
3rd Plate Clocked and Stacked On
Top of 2nd
5. Stacked Configuration:
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Stand-Offs Added
4th Plate Clocked and Stacked On
Top of 3rd
5. Stacked Configuration:
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Stand-Offs Added
5th Plate Clocked and Stacked On
Top of 4th
5. Stacked Configuration:
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Stand-Offs Added
Stacked Configuration ~10 pounds
5. Stacked Configuration:
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5 Plate Stack Attached to Can
Bottom Bulkhead
6. RocketSat Can Configuration:
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Split Barrel Section Added and attached to
Bottom Bulkhead
(8 Places)
6. RocketSat Can Configuration:
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5 Plate Stack Stand-offs
attached to Top Lid. Barrel
Section attached to Top Lid
(8 Places)
Assembled can with payload ~20
pounds
6. RocketSat Can Configuration:
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Bottom Bulkhead
6. RocketSat Can Configuration:
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Barrel Section
6. RocketSat Can Configuration:
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Top Lid
6. RocketSat Can Configuration:
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7. Can Integration to Launch Vehicle:
Use of standard can will simplify integration
3 longerons and 5 Sub-SEM Rings
Can #1 integrated and bolted to Sub-SEM Ring
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7. Can Integration to Launch Vehicle:
Use of standard can will simplify integration
Can #2 integrated and bolted to Sub-SEM Ring
Electrical Connections to Latching Relays run down side of Cans and through inner diameter of Sub-SEM Ring
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7. Can Integration to Launch Vehicle:
Use of standard can will simplify integration
Can #3 integrated and bolted to Sub-SEM Ring
Electrical Connections to Latching Relays run down side of Cans and through inner diameter of Sub-SEM Ring
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Can #3 has camera payload
(See Section #9)
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7. Can Integration to Launch Vehicle:
Use of standard can will simplify integration
Can #4 integrated and bolted to Sub-SEM Ring
Electrical Connections to Latching Relays run down side of Cans and through inner diameter of Sub-SEM Ring
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7. Can Integration to Launch Vehicle:
Use of standard can will simplify integration
Can #5 integrated and bolted to Sub-SEM Ring
Electrical Connections to Latching Relays run down side of Cans and through inner diameter of Sub-SEM Ring
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Can #5 has different payload to test standard concept for next year’s workshop
(See Section #9)
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7. Can Integration to Launch Vehicle:
4th Longeron is added after all electrical connections have been made
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~1.0” – 2.0” between top of can and Sub-SEM ring
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7. Can Integration to Launch Vehicle:
Rocket skin is attached.
Estimated Rocket skin length is ~66 inches.
This does not include area for latching relays or other Wallops equipment.
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View port needed here.
(See Section 9)
Static and Dynamic port needed here.
(See Section 9)
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Boulder:
3d Modeling in Solidworks Yields Preliminary Center of Gravity
Functional Tests by System During Integration
Testing of Completed Payload:
Mission Simulation
Moments Around 2 Orthogonal Axes - CG
Correlation of Measured CG to Simulated
8. Testing:
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Wallops Space Center:
Spin – Measure CG, Moment of Inertia (Single Disc)
Vibration – Single Payload Disc on Vibration Table
Bending – 5-Payload Can in Simulated Rocket Body
This testing will occur with students during the week of March 24 – 27, 2008 at Wallops
8. Testing:
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9. Special Requests: Request #1
Substitute 2 Workshop experiment decks in one can and replace it with a camera deck to record flight for participants
Can CG will be same as other can but this requires a view port
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9. Special Requests: Request #2
One of the goals of the workshop is to help develop a standard package to launch future sounding rocket payloads
This concept is part of the sustainability for future workshops at Wallops
Each future workshop would fly 1 – 3 paying customers (previous workshop participants) payloads in a RocketSat Can
Would like to demonstrate this concept on the first flight with the 5th Can
This is payload is called RocketSat IV and is a CU undergraduate student payload being developed since September 2007
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9. Special Requests: Request #2
RocketSat IV has the following Mission Statement
RocketSat IV will expand the knowledge of the composition of the upper atmosphere by measuring the concentrations of carbon dioxide and methane above 30km.
- RocketSat IV would have a balanced CG and require no power or telemetry.
- RocketSat IV would have the same weight as a normal Workshop Can (10 lbs)
- RocketSat IV would be contained in the same Can system being used during the workshop
- RocketSat IV would require a dynamic and static pressure port to sample atmosphere from apogee until a unspecified time before parachute deployment
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9. Special Requests: Request #2
- RocketSat IV consists of stainless steel tubing
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9. Special Requests: Request #2
- The tubing is vacated at apogee
- As pressure increases, air is forced into the tube, compresses, and remains in the order that it was sampled
- Sample is analyzed using laser analyzer after the flight
Air
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9. Special Requests: Request #2
- Two sections of tubing will be used to collect separate samples from different durations of the flight.
- One tubing will collect atmosphere from apogee to 30km where it will be sealed
- The second tubing will collect atmosphere from apogee to just before the parachute deploys.
Dynamic pressure port
- Sample the low density air more effectively, we need to have dynamic pressure force air into the tubing.
Static pressure port
- For sampling purposes, we need a static pressure port to measure ambient pressure to identify the altitude.
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9. Special Requests: Request #2
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10. Summary of Final Configuration
- Internal Configuration
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10. Summary of Final Configuration
- Integrated Can Configuration
Cans 1, 2, and 4
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10. Summary of Final Configuration
- Integrated Can Configuration
Can 3
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10. Summary of Final Configuration
- Integrated Can Configuration
Can 5
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10. Summary of Final Configuration
- Launch Vehicle Integration
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10. Summary of Final Configuration
- Skin with two access areas for:
1 View port
1 Static port
1 Dynamic port
Total payload weight with cans ~100 pounds
Payload section ~66 inches long
Launch scheduled for June 27, 2008
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