Project YES!Critical Design Review

Team Search:

Matt Paley,Emily

Fuentes,Nick Stohl,

Ian Andrzejczak,

Jackie Myrose,

Erik Horn

10/6/09

Mission Statement

• Fly to 30 kilometers

• Collect data on amount of humidity in the air at various altitudes and temperatures– Hoping to find an altitude with low enough

humidity to keep ozone from reacting with aluminum

• Test the effectiveness of foam core to keep the BalloonSat at operational temperature without additional insulation– Design that could allow for more of mass

budget to be allotted to science payload

Reasons for Change of Science Mission

•Ozone degrades after half an hour

•Not contaminating sample

•Ozone is extremely reactive: plastics & metals

–Aluminum - water vapor–Titanium - weight, cost, manufacturability

•Small enough but powerful enough motor/chain

Requirements Flow Down:Mission Goal

Legend:

Type:Reference:

G Goal R Parent Reference

O Objective G Goal Parent Reference

F Functional O Objective Parent Reference

P Performance CR Cross Reference

GC Gateway Constraint

Type Goal Mission Science Goal

G G

The Project YES! BalloonSat will fly to an altitude of approximately 30 kilometers. The mission shall be to test how much humidity is in the air relative to various altitude levels and temperatures in hopes of finding where a physical atmosphere sample could be gathered on future missions and brought down without the ozone in the air reacting with an aluminum collection container. At the same time, the Project YES! BalloonSat shall test the effectiveness of foam core at keeping the BalloonSat hardware at operating temperature, without using extra insulation. If a naked foam core layer is sufficient to maintain operating temperature, then the removal of additional insulation would allow for more of the mass to be dedicated to science payload.

Requirements Flow Down :Mission Objective 1

Type Objective Mission Objectives Level 0 Reference

O O1Team Search shall measure the pressure, temperature and

humidity as a function of altitude.G

Type Requirement O1 Objective Requirements Level 1 Reference

O R1.1PROJECT YES! shall measure the pressure using both an internal and an external

pressure sensor.O1

O R1.2PROJECT YES! shall take the temperature on the AVR board, in the air pocket,

and on the outside of the BalloonSat.O1

O R1.3PROJECT YES! shall measure the humidity in the air pocket and on the outside

of the BalloonSat.O1

Type Requirement O1 System Requirements Level 2 Reference

P R1.1.1 PROJECT YES! shall determine the altitude from the pressure using MATLAB. R1.1

P R1.2.1 PROJECT YES! shall correlate the temperature to altitude using MATLAB R1.2

P R1.3.1 PROJECT YES! shall correlate the humidity to the altitude and temperature. R1.3

Requirements Flow Down:Mission Objective 2

Type Requirement O2 Objective Requirements Level 1

Reference

P R2.1PROJECT YES! shall measure the temperature inside a box of a single layer of foam

core.O2

P R2.2 PROJECT YES! shall further insulate the AVR board to ensure its functioning. O2

Type Objective Mission Objectives Level 0 Reference

O O2Team Search shall investigate the thermal properties of

using one layer of foam core.G

Type Requirement O2 System Requirements Level 2 Reference

P R2.1.1PROJECT YES! shall compare temperatures recorded during the mission to the

operating parameters for the AVR board supplied in the user manual.R2.1

CR R2.2.1PROJECT YES! shall use an additional foam core layer to keep the AVR board

above -10° Celsius.R2.2: R3.7

P R2.2.2 PROJECT YES! shall have an air pocket between the two foam core layers. R2.2

Requirements Flow Down:

Mission Objective 3Type Objective Mission Objectives Level 0 Reference

GC O3Project YES! shall comply with all requirements set by

Gateway to Space RFP.G

Type Requirement O3 - Gateway Requirements Level 1 Reference

GC R3.1 The BalloonSat total mass shall not be more than 850 g. O3

GC R3.2 The COSG subsidy shall not exceed $100.00. O3

GC R3.3The payload shall allow for secure mounting to the Balloon Rope via a tube inserted

into the design and build of the BalloonSat. O3

GC R3.4 The BalloonSat shall have a visible American Flag on its outside surface. O3

GC R3.5 BalloonSat must be constructed of either foam core or Aluminum. O3

GC R3.6Team Search shall determine the accent and decent rates of the BalloonSat.

O3

GC R3.7 The AVR board shall be kept at above -10° Celsius. O3

GC R3.8 The BalloonSat shall be able to fly again after landing. O3

Requirements Flow Down:

Mission Objective 3 Cont.Type Objective Mission Objectives Level 0 Reference

GC O3Project YES! shall comply with all requirements set by

Gateway to Space RFP.G

Type Requirement O3 - Gateway Requirements Level 1 Reference

GC R3.1 The BalloonSat total mass shall not be more than 850 g. O3

GC R3.2 The COSG subsidy shall not exceed $100.00. O3

GC R3.3The payload shall allow for secure mounting to the Balloon Rope via a tube inserted

into the design and build of the BalloonSat. O3

GC R3.4 The BalloonSat shall have a visible American Flag on its outside surface. O3

GC R3.5 BalloonSat must be constructed of either foam core or Aluminum. O3

GC R3.6Team Search shall determine the accent and decent rates of the BalloonSat.

O3

GC R3.7 The AVR board shall be kept at above -10° Celsius. O3

GC R3.8 The BalloonSat shall be able to fly again after landing. O3

Parts

• HS1101 Humidity Sensor (2)

• Pressure Sensor (1 additional)

• HOBO (Two temperature sensors)

• AVR (Temperature and pressure sensors)

• As of now nothing has been ordered, our goal is to have all parts ordered by Thursday

• It should take approximately 5-7 business days for shipping, so the hardware should be delivered by October 16th

Design

• Draw designs on foam core, cut out pieces (leaving paper in tact for folding, 45 degree edges) and cut out holes for wires, connections and camera hole

• Attach sensors to foam core walls with hot glue, attach camera/HOBO/batteries with duct tape/velcro, and heater/AVR with screws

• Routing and securing wires throughout box and to the holes we cut in foam core

• Structural support made of foam core attached to inner and outer boxes

• Close box by gluing sides together and sealing with aluminum tape

Design continued

Functional Block Diagram

Testing Plan and Schedule

– Making sure our materials will work for the purposes we are assigning to them. Ongoing

– Testing the entire design of the BalloonSat itself (Whip test, drop test, stair test)

10-09-09: Whip, Drop, and Stair Testing

– Making sure our weather sensors are operational10-13-09 through 10-15-09: Sensor Testing

Testing Plan and Schedule Cont.

– Testing the software and codes to ensure they run correctlyOngoing

– Testing the subsystems (including heating and CCD camera,

mass and power limitations)10-22-09: Cold Test

– Full scale mission simulation 10-20-09: Full System Simulation10-24-09: Full System Simulation

Monetary Budget

Budget Actual ETC EAC

Component Quantity Unit Cost Ea Budget Quantity Actual Estimate Total

Digital Camera 1 Ea $0.00 $0.00 1 $0.00 $0.00 $0.00

2GB Memory Card 1 Ea $0.00 $0.00 1 $0.00 $0.00 $0.00

AVR Microcontroller 1 Ea $0.00 $0.00 1 $0.00 $0.00 $0.00

HOBO Data Logger 1 Ea $0.00 $0.00 1 $0.00 $0.00 $0.00

Heater Kit 1 Ea $0.00 $0.00 1 $0.00 $0.00 $0.00

Switches 2 Ea $0.00 $0.00 1 $0.00 $0.00 $0.00

Foam Core 1 Lot $0.00 $0.00 1 $0.00 $0.00 $0.00

Miscellaneous Structure 1 Lot $0.00 $0.00 1 $0.00 $0.00 $0.00

Test 9-volt Batteries 8 Ea $2.50 $20.00 $0.00 $20.00 $20.00

Butterfly Valve 3 Ea $10.00 $30.00 0 $0.00 $0.00 $0.00

Small Motor 3 Ea $4.50 $13.50 0 $0.00 $0.00 $0.00

Chain 1 Ea $3.00 $3.00 0 $0.00 $0.00 $0.00

18" x 6" Aluminum Plate 2 Ea $7.98 $12.50 $0.00 $0.00 $0.00

Dry Ice 10 lbs $1.00 $10.00 $0.00 $10.00 $10.00

HS1101 Humidity Sensor 2 Ea $4.99 $0.00 $0.00 $9.98 $9.98

$89.00 $0.00 $39.98 $39.98

Mass Budget

ScheduleBuild Prototype for Testing 10-08-09

Whip, Drop, and Stair Testing Completed 10-09-09

Buy Any Extra Hardware Necessary 10-09-09

Build Main Structure of Box 10-10-09

Attach Sensors to AVR Board 10-12-09

Test Sensors 10-13-09 through 10-15-09

Complete Satellite Built 10-17-09

Full System Simulation 10-20-09

Cold Test 10-22-09

Second Full System Simulation 10-24-09

Pre-Launch Inspection 10-27-09

In-Class Mission Simulation Test 10-29-09

Troubleshooting 10-31-09 through 11-2-09

Design Document Rev C Due 11-03-09

Final Weigh-in and Turn In 11-06-09

Launch 11-07-09

Analyze Data 11-09-09 through 11-18-09

Design Document Rev D Due 12-01-09

Final Presentations Due 12-01-09

Design Expo 12-05-09

BalloonSat Hardware Turn In 12-08-09

We will also be meeting

together weekly as an

entire team, on

Saturday mornings from

9 – 11 am, in order to

check in with each other

and make sure all

aspects of the

BalloonSat are still

working together as

they should be and/or

trouble shoot and fix

problems as they arise.

Smaller groups will

meet to work on specific

tasks as needed

throughout.

Organization Chart

Expected Results

• Data to create a weather satellite that can accurately measure temperature, pressure, and humidity during altitude changes.

• There exists a correlation between humidity and altitude.

• The unique design for heating of the satellite will work more efficiently than that of a normal box shape.

Biggest Worries

• Data corruption

• Structural stability

• Reusability

• Thermal problems