TEAM SCREAMFINAL PRESENTATION

Joshua Yeaton, Kevin Dinkel, Conrad Schmidt, Christopher Warren, Christopher Kopacz

12/4/08

Mission Overview

The primary mission of Project SCREAM shall be to create a satellite in compliance with the RFP to ascend to an altitude between 25,000 and 30,000 meters to measure the difference between the audibility of sound at launch altitude and the maximum altitude achieved by the satellite.

The secondary missions of Project SCREAM shall be to acquire photos of the curvature of the Earth, measure the internal humidity of the satellite, measure internal and external temperature, and measure altitude and flight path of the satellite.

Design Overview

5 main systems on-board Camera Heater GPS HOBO Sound System

Camera

The camera was modified to take pictures every 21 sec and wired to be turned on and off by an external switch.

Heater

The heater was connected to three Lithium Ion 9V batteries.

GPS

The GPS module ran off of two lithium ion batteries and consisted of a miniSD card logger for data storage.

HOBO

The simplest component of the payload, the HOBO measures external and internal temperatures as well as internal relative humidity.

Sound System

The chromatic tuner emits a sound (261.33 Hertz middle C) at set intervals through a sound chamber.

The MP3 flight file recorded on the voice recorder is then transferred to a PC .

The MP3 file is then analyzed with Audacity software. Decibel readings during every three minute interval will be examined for the emitted tone and its harmonics.

The tone is recorded by the voice recorder, found on the opposite end of the chamber, for the entirety of the flight

GPS Power Source

Camera Memory

Recorder PowerRecorder Power

RecorderRecorder

GPSGPS

12 V Battery12 V Battery

SwitchSwitch

SpeakerSpeaker

Speaker PowerSpeaker Power

TimerTimer

External TempExternal Temp

HOBOHOBO

9 V Battery9 V Battery

SwitchSwitch

HeaterHeater

9 V Battery9 V Battery

9 V Battery9 V Battery

CameraCameraCamera Power SourceCamera Power Source

Switch

Proposal Differences

Addition of a GPS unit as one of the science missions

Scrapped HOBO pressure sensor. Used a glass filter in place of Plexiglas

for viewport for camera.

Camera Data

Camera complete success

GPS Data

Also Complete Success GPS Data Falls Off at 24,200 meters –

main mission to determine altitude at which this unit cannot function.

HOBO Data

Indicates Exterior Temperatures as low as -90 degrees F.

Interior as low as 10 degrees F, only above 32 for a short period of time.

Internal Temperature

External Temperature

Preflight Noise Ascent Ascent Descent

Launch Timing Circuit Failure Burst

Flight Diagram

Elapsed Time (s) A(4) 440Hz dB A(5) 880 Hz dB0.00 11.7 0.8

255.00 14.4 5.9500.00 13 4.7750.00 12.3 4

1005.00 12.4 3.21245.00 12.5 1.61490.00 12.2 -0.031740.00 11.7 -2.21980.00 11.5 -42220.00 12.2 -2.82460.00 12.6 -4.22700.00 12.9 -52925.00 13.5 -4.73170.00 13.8 -4.83380.00 14.3 -53600.00 14.9 -4.8

B(7) Tone Shutter Sound

Shutter Sound Diagram

Elapsed Time (s) B(7) 4055-4061 Hz51.00 15.6

261.00 17.5504.00 16.1770.00 16.4

1020.00 11.61263.00 8.11515.00 5.21755.00 42010.00 02230.00 -3.92470.00 -62700.00 -14.22950.00 -24.23180.00 -25.73405.00 -27.43610.00 -28.13810.00 -34.93990.00 -36.74170.00 -37.54350.00 -36.74530.00 -34.94722.00 -33.34905.00 -40.75090.00 -42.15250.00 -37.95430.00 -33.25505.00 -32.6

Failure Analysis

Battery for timing circuit failed. Extreme cold likely as cause.

Tested voltage applied by 12 V battery: 0 V. At room temperature and during cold test, system had no problems lasting for 3 hours.

Replaced battery and sound system worked again.

Repairing Failures

Will wire another 12 V battery in series to make two batteries.

Move batteries closer to heater. Turn on heater earlier – internal

temperature needed more of a buffer before beginning flight.

Conclusions

Our GPS receiver does not function above 24,200 meters.

We acquired excellent pictures of the curvature of the Earth

12 V batteries fail at too cold of a temperature.

Conclusions (cont)

Sound Data – although the tuner failed, the camera provided usable data.

As altitude increases, the audibility of sound decreases on a linear curve.

With exterior temperatures around -70 degrees C, it was impossible to keep interior temperatures above 0 degrees C.

Lessons Learned

Would test batteries at lower temperatures.

Cold test earlier on in development cycle.

Turn on heater for satellite earlier. Begin box construction earlier. Make sure that all hardware is acquired

EARLY.

Ready for Flight

Store payload without batteries attached to any system.

No other special storage requirements. To reactivate: GPS batteries charged by

connecting GPS circuit board to computer via USB

Attach all batteries. GPS and tuner must be activated from

inside payload – tuner is powered on then tone activated, GPS has a switch.

Appendix

RFP Compliance Team SCREAM shall comply with the following RFP requirements:

An additional science experiment is installed inside of the BalloonSat involving the measurement of sound amplitude as a function of altitude. COMPLETED

After flight, the BalloonSat shall be turned in working and ready to fly again. READY TO FLY AGAIN

The plastic tubing provided shall be installed through the center of the satellite so that it can be easily connected to the balloon tether. It will be connected in such a way that it will not pull through the BalloonSat or obstruct the flight string. COMPLETED

With the heater provided and the layout of our design, the BalloonSat’s enterior will not go below the minimum temperature of 0 degrees celcius. FAILED DUE TO EXTREME EXTERIOR TEMPERATURE

The entire electronic system, with the exception of the external temperature probe, will remain within the main structure of the BalloonSat. COMPLETED

Our total weight shall not exceed a total of 1000 grams. 960 GRAMS

We will acquire the ascent and descent rate of the flight string using data from our internal GPS system. DATA ACQUIRED

The Balloonsat design allows for a HOBO H08-004-02 that is 68x48x19 mm and 29 grams. COMPLETED

The Balloonsat design allows for external temperature cable. COMPLETED

The Balloonsat design allows for an Canon A570IS Digital Camera that is 45x75x90mm and 220 grams. COMPLETED

The structure of the satellite shall consist of foam core, insulation, and aluminum tape. COMPLETED

Contact information and a United States flag shall be visibly displayed on the exterior of the satellite. COMPLETED

All parts were ordered using Chris Koelher’s CU mastercard, and thus, all hardware is property of the Colorado Space Grant Consortium and will be returned to the Colorado Space Grant Consortium at the conclusion of the semester. COMPLETED

No one shall get hurt during the design or launch of the BalloonSat. COMPLETED

The satellite shall be in working condition within one week of launch on 11/15/2008. COMPLETED

A final report shall be submitted and a presentation given involving the final design and results of Team SCREAM’s mission. TO BE COMPLETED

Mass and CostComponent Weight (grams)

Foam Core 130.00

9 volt Battery (3) 101.40

12 volt Battery (1) 4.50

Canon A570IS Digital Camera w/ Memory Card

220.00

Timing Circuit 60.00

Hobo Temperature Data Logger 39.00

GPSAluminum TapePolymer Lithium Ion Battery (2)

82.0024.0010.00

Switches (3) 20.00

Heater Circuit 30.00

Korg CA30 Chromatic Tuner 66.80

Sony ICDP620 Digital Voice Recorder 50.00

Insulation and Styrofoam Chamber 70.00

AAA Battery (6)American FlagAttachment TubeKingston 2GB microSD Memory Card40.5mm Skylight (1B) Glass Filter

45.602.0010.005.005.00

Total 975.30

Component Price

Foam CoreSpare Foam Core (1)

(provided)(provided)  

9 volt Battery (3) (provided)  

12 volt Battery (2)Aluminum Tape

(provided)(provided)  

Canon A570IS Digital Camera w/ Memory Card

(provided) 

Timing Circuit (provided)  

Hobo Temperature Data Logger (provided)  

GPS (provided)  

Switches (2) (provided)  

Heater CircuitAAA Battery (6)Spare Battery (All Types)American FlagAttachment TubeInsulationSpare InsulationInsulation Sound ChamberKingston 2GB microSD Memory Card

(provided)(provided)(provided)(provided)(provided)(provided)(provided)(provided)$29.39

 

Korg CA30 Chromatic TunerPolymer Lithium Ion Battery (2)

$16.58$40.45  

Sony ICDP620 Digital Voice Recorder

$56.40 

40.5mm Skylight (1B) Glass Filter $21.45  

 

Total $164.27  

Message to Next Semester

Start work early. If you are getting parts from a source

other than Space Grant, be sure to get them early or get very accurate estimates of volume and mass.

Cold Test – be sure to get the payload very cold and test battery life rigorously at these temperatures.