Hang SevenCritical Design

Review Sierra Williams, Lucas Migliorini, Abby Caballero, Chase Goodman, Paul Smith, Becca Lidvall, Ethan Hollenbach, Nikhil

DesaiOctober 18th, 2012

Mission Overview•Objective

•Measuring Gamma Radiation as Altitude Increases

•Testing the effectiveness of aluminum and carbon fiber on reducing radiation levels

Why do this?•Determine the trend in gamma

radiation on earth, as the altitude increases

•Test the effectiveness of materials currently used in aircrafts

•Discover the altitude where the radiation can be detrimental to human health

Hypothesis•We predict the gamma radiation

will raise linearly as the altitude increases

•The aluminum and carbon fiber will both reduce radiation levels to a non-lethal amount

•The aluminum will block more radiation than the carbon fiber

Team MembersName Lead AssistantPaul Smith Structural Design

Material Acquisition, Power

Chase Goodman Thermal, Power Structural Design

Ethan HollenbachMaterial Acquisition,

BudgetGround Ops

Rebecca Lidvall Manufacturing, C&DH Budget, Science

Nikhil Desai Software, Camera Thermal, C&DH

Lucas Migliorini Science, Ground Ops Manufacturing

Abbigail Caballero System Engineering Software, Camera

Sierra Williams Project Manager System Engineering

RequirementsLevel Number Requirements

0 1 Payload must ascend to an altitude of 30 kilometers via balloon

0 2 Payload must store and collect data from our sensors

0 3 The payload's mass must not exceed 1.025kg

0 4 The internal temperature of the payload must not drop below -10° celsius

0 5 The payload must be able to hold all electronics and sensors

0 6 The payload must contain a heater

0 7 The payload must contain a power source

0 8 The payload must be constructed solely of foam core

0 9 The payload must be ready for launch by 1 December 2012

0 10 The payload must contain three working geiger counters

0 11 The team and project must obey all safety precautions

Requirements Cont.Level Number Requirements

1 1 The geiger counters must be able to accurately measure gamma radiation 1 2 The payload will store and record data from the Geiger counters to an SD card

1 3The payload must survive the ascent and descent and all the forces associated with both

1 4 The payload will contain aluminum and carbon fiber testing tubes1 5 Connect the geiger counter to the Arduino microcontroller1 6 Program the Arduino microcontroller to collect information1 7 Use aluminum to shield one Geiger counter form radiation1 8 Use carbon fiber to shield one Geiger counter form radiation1 9 Use one Geiger counter as a control for radiation measurement1 10 Calibrate home-made Geiger counters to an industry standard Geiger counter

Level Number Requirements2 1 Take the measurements from the Geiger counters and plot them looking for trends

• Foam core

• Hexagonal

• Centripetal force

• Equipment

• Arduino Uno

• To tell the machinery in the Balloon Sat what to do

• Collection of Data

• Control of Geiger counter and Camera

• Storage of Data

• Sensors for humidity, condensation, and temperature

• Camera

• Canon SD780 to capture the majestic earth in pictures and videos

Design StructureArduino

Design Structure (cont.)

Arduino

Functional Diagram

Heater

Switch 2

3x9V Batteries

Geiger Counter

Switch 3

Arduino Board

2 AA Batteries

Geiger Counter

Switch 4

2 AA Batteries

Geiger Counter

Switch 52 AA Batteries

Camera

Lithium-ion Battery

Switch 1

1 GB SD Card

Biggest WorriesHardware-Sensors failure

-Electrical failure-Overheating-Faulty programming-Geiger counters not working

Structural-The G’s after the balloon pop-Integrity of the structure-Condensation inside the -BalloonSat-Temperature

Test Plan

Predicted Results•The Geiger counter that is not protected

will read substantially higher radiation than the protected Geiger counters

•The Geiger counter that is not protected will reach a lethal level

•The Geiger counter with an aluminum cover will read less gamma radiation than the Geiger counter with carbon fiber cover