(PDR )
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Transcript of (PDR )
(PDR )
University of Northern Colorado
Nathan and Casey
11/14/08
Due to acceleration of their containers onboard liquids manifest reactive forces on their containers. These forces
can have adverse effects on the performance of the vehicle.
A simpler analytical model is presented to describe liquid slosh. This simplified model, although not comprehensive, may yield practical
results.
An experiment to verify the validity of such an analytical model will be conducted. By comparing the predictions made by the analytical model and actual slosh data, the accuracy of such a model can be assessed.
Problem:
Solution:
Experiment:
Mission Overview
ObjectiveThe primary mission of the SplashSAT experiment is to
determine the validity of our analytical method.
MethodIn order to validate our hypothesis we will measure the motion of a fluid filled container aboard the sounding rocket. Comparison of experimental data and mathematical modeling will allow us to check the accuracy of such a model.
Mission Overview
Mission Requirements
Provide quantitative data about the motion of the canister along the rail.
Subsystems
Power System: -Provide 2.5 W of continuous power. -Must supply power for 45 min.
Data Storage:-All data will be stored on non-volatile memory.
Thermo Control:-System will not be bellow 40 degrees F-System will not be above 100 degrees F(We can not have the water freeze or evaporate)
Structures:-No water shall be released into the canister environment.
Special Requirements
NONE
Experiment (5V)
IR
IR
IR
IR
Atmega32
Accelerometers(3.3V)
Mechanical Restraints
DataLogger
SDCard
Power
Battery
Kill
G-switch
Latch5 V Reg
3.3 V RegPower
Switch (5V)
5 V Out
3.3 V Out
Block Diagrams
Canister View
Canister View
Canister Picture
Full
Front Wall
Side Wall
Top
View
Electrical Schematics
Electrical Schematics
Software Flow Chart
Activation of G-Switch
Data Logger Initializes
Read Accelerometer
Read Encoder
Perform Velocity Calculation
Write to Data Logger
Active – When the G-switch is enabled data collection will begin. (It will collected data until the battery runs out)
Memory Budget - - 500 Samples per Second - Each Sample is 4 bytes- 4 KB per Second- 72 MB
Test Plans
What type of testing can be performed on your payload pre-flight?- Bench test- Electrical Test- Vibe/Shake Test
What is required to complete testing?:- Both support hardware and software need be purchased.
Test Plans
Potential points of failure
-Liquid filled canister leaking
-Premature activation
Parts ListPart Amount ($) Manufacture
3-Axis Accelerometers $30.00 DigiKey
NiCd Battery $20.00 Local Hobby Store
G-Switch $10.00 DigiKey
Experimental Apparatus $150.00 BigBlueSaw.com
Photo-Gates (4) $80.00 DigiKey
SD Card Supplied by UNC In House
Data Logger $60.00 SparkFun
Power System $20.00 DigiKey
Atmega32 $10.00 DigiKey
Mechanical Restraints $20.00 In House
Latch $15.00 DigiKey
TOTAL $415.00
• RockSat Payload Canister User Guide Compliance
– Mass, Volume
• To be determined, we would like to discus this in our teleconference.
– Payload activation?• The payload will be activated by a g-switch upon
launch• It will comply with Wallops “no volt” requirement
with a kill switch.
Shared Can Logistics Plan
To be determined, we would like to discus this in our teleconference.
Updated Organizational Chart
Nate (Flight Lead)
Casey (Minion)
JUST
DO IT
Updated Mass Estimates
Assembly Mass (gram)
Electronics Board 200
Experimental Apparatus 1000
Battery 600
Chassis700 (Aluminum) or
450 (Magnesium
TOTAL 2250 or 2500
Conclusions
Issues and Concerns
1) Is our payload viable with the dimension requirements of the canister?
2) Does our design allow accessibility for other payloads?
3) Is our onboard liquid going to be a concern?