Echo Final Presentation
description
Transcript of Echo Final Presentation
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Echo Final Presentation
Andrew Berg, Shawn Carroll, Cody Humbargar, Jade Nelson, Jared Russell, Austin Williamson
12-05-06
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Mission Overview
Main Science Mission-
• Test the effect of air pressure on sound waves.
• Compare sounding data to EOSS pressure data.
Secondary Science Mission-
• HOBO data logger used to measure internal and external temperature during flight
• HOBO also used to test humidity levels inside balloon-satellite.
Non-Science Mission-
• Using main imaging hardware to take photographs during flight.
• Secondary imaging hardware will using ultraviolet / infrared filters to take photographs.
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Design
• Balloon satellite measuring 150mm x 145mm x 100mm.
• Cameras face same direction
-Primary ELF
-Secondary 35mm IR Photography
• Main science system will be shock mounted
• Compact internal arrangement
• Atmospheric venting through desiccant
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Science Signal Flow
HOBO
Rectifier/Limiter
Microphone
Driver
Oscillator
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Design Pictures
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RFP Satisfaction
Payload will be ready to fly by the end of the week
Mass and financial budget were not exceeded
Other RFP requirements met
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Results and Analysis
•Expected Results–Linear correlation–Possible correlation with temperature
•Data Analysis–EOSS Pressure Data–Derived pressure based on altitude (General Case)–Running average of voltage data
Voltage vs. Time
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7:17:41 AM7:22:41 AM7:27:41 AM7:32:41 AM7:37:41 AM7:42:41 AM7:47:41 AM7:52:41 AM7:57:41 AM8:02:41 AM8:07:41 AM8:12:41 AM8:17:41 AM8:22:41 AM8:27:41 AM8:32:41 AM8:37:41 AM8:42:41 AM8:47:41 AM8:52:41 AM8:57:41 AM9:02:41 AM9:07:41 AM9:12:41 AM9:17:41 AM9:22:41 AM9:27:41 AM9:32:41 AM9:37:41 AM9:42:41 AM9:47:41 AM9:52:41 AM9:57:41 AM10:02:41 AM10:07:41 AM10:12:41 AM10:17:41 AM10:22:41 AM10:27:41 AM10:32:41 AMTime (H/M/S)
Voltage (V)
Pressure and Altitude
y = 1070.1e -4E-05x
R2 = 0.9989
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Altitude (feet)
Pressure (millibars)
Alt V. Pressure
Expon. (Alt V. Pressure)
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Barometric Pressure Vs. Voltage
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7:25:477:29:477:33:477:37:477:41:477:45:477:49:477:53:477:57:478:01:478:05:478:09:478:13:478:17:478:21:478:25:478:29:478:33:478:37:478:41:478:45:478:49:478:53:478:57:479:01:479:05:479:09:479:13:479:17:479:21:479:25:479:29:479:33:479:37:479:41:479:45:479:49:479:53:479:57:4710:01:4710:05:4710:09:4710:13:4710:17:4710:21:4710:25:4710:29:4710:33:47
Time
Pressure (millibars)
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Average Voltage
Barometric PressureVoltage
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Data Conclusions
•Definite Correlation, but not linear as expected.
•More trials (launches) are needed to reach more specific conclusions.
-Data could be inaccurate due to equalization lag
-Need accurate pressure sensor
•Sources of error
-Equalization lag
-Pressure sensor accuracy
Altitude and pressure
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7:25:477:31:177:36:477:42:177:47:477:53:177:58:478:04:178:09:478:15:178:20:478:26:178:31:478:37:178:42:478:48:178:53:478:59:179:04:479:10:179:15:479:21:179:26:479:32:179:37:479:43:179:48:479:54:179:59:4710:05:1710:10:4710:16:1710:21:4710:27:1710:32:47Time
Altitude
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Pressure (millibars)
Altitude
Pressure
Ascent
y = 2E-09x3 - 4E-06x2 + 0.003x - 0.1867
R2 = 0.934
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Pressure
Voltage
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Flight Statistics
•Max ascent rate: 1501.313 ft/min
•Max descent rate: 9944.23 ft/min
•Launch: 7:28:47 11/11/2006
•Landing: 9:54:17 11/11/2006
•Max altitude: 98832.02 ft at 9:23:17
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Ready To Fly Again
Final preflight too complicated
-Camera power on main switch
-Resolve film issues
Camera failure due to battery enclosure
-Fixed battery enclosure
-Could switch timer relay to DPST
Low peak voltage at sensor
-Modified sound tube
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Sound Experiment
Experiment As Flown Modified Experiment
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Round Two Pre-Flight
Store the payload,closed, in a cool, dry place
•Replace Consumables
-Modify IR film canister
-Clean IR filter
•Activation
-Power on cameras
-Set flash
-Activate timing circuit
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Conclusions
• The correlation between sound transmission and pressure could be linear, but additional flights are needed for surety.
• Given the data, sound does not conduct as well at higher altitudes compared to lower altitudes.
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Lessons Learned
All parts of the craft need equal attention
Activation should not require the craft to be open
Tape is ineffective in near-space
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Message To Next Semester
Don’t be afraid to ask for help
Take your problems one at a time
Keep your experiment simple, but try something challenging
Test thoroughly
Leave plenty of time for problems