(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?