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Atmospheric Wind Measurement WindSat

Atmospheric Wind Measurement WindSat. University of Colorado at Colorado Springs WindSat Team: Rodger Mourning Courtnee Applegate Justin Perkins Anna Stanko Faculty Advisor: Dr. Jason Roney. Presentation Agenda. WindSat project overview Flight summaries Results Conclusions

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Atmospheric Wind Measurement WindSat

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  1. Atmospheric Wind MeasurementWindSat University of Colorado at Colorado Springs WindSat Team: Rodger Mourning Courtnee Applegate Justin Perkins Anna Stanko Faculty Advisor: Dr. Jason Roney

  2. Presentation Agenda WindSat project overview Flight summaries Results Conclusions Questions

  3. WindSat Challenge • Measurement of wind speed and direction. (Anemometer could not be used) • Payload mass limit of 1.8 kg. • Dimensional limit of 20 cm. • Harsh environment and conditions. (-60 degrees C, 0 kPa) • Landing impact survival.

  4. WindSat Applications • Space Missions / Research: Determination of atmospheric conditions prior to a planetary explorer descent can greatly decrease the chance of mission failure. • Atmospheric Research: Direct wind measurement would improve weather models.

  5. WindSat Design WindSat1 Systems: • Wind Measurement System • Four Pitot static probe configuration. • Four differential pressure transducers. • Four channel data logger (MicroDaq). • Type T Thermocouple (HOBO) • Pressure, Humidity, Temperature Sensor (MicroDaq). • Electric heater with thermostat. WindSat2 Revisions: • Rudder and bearings for wind alignment.

  6. WindSat Design WindSat1 WindSat2 Instrument Mounting Module

  7. Instrument Testing • Preliminary tests were exploratory. • Determine variables of dependency. • Become familiar with instruments (operating range, etc.) • Pressure transducer calibration. • Pitot tube wind tunnel testing. • Instrument accuracy verification.

  8. WindSat1 Flight Summary • Maximum altitude: 30.4 km (99,760 ft) • Maximum ground speed: 35 m/s (79 mph) • Minimum temperature: -61 C (-77 F)

  9. WindSat2 Flight Summary • Maximum altitude: 12.4 km (40,600 ft) (Ice accumulation ended ascent) • Maximum ground speed: 31 m/s (70.6 mph) • Minimum temperature: -61 C (-77 F)

  10. Temperature Results Lapse Rates: EOSS 71 0 to 15 km: B1 = -7.24 K/km 15 to 30 km: B2 = 1.87 K/km EOSS 73 0 to 12 km: B = -7.36 K/km U.S. Standard Atmosphere 0 to 11 km: B = -6.5 K/km

  11. Pressure Results Pressure Profile:

  12. Wind Speed Results Atmospheric winds: Absolute wind speed = Mean wind speed + Relative gust speed Vw = Vm + Vg

  13. Mean Wind Speeds Determined from GPS tracking data. EOSS 71: For0 < z < 13 km Vm = (0.0026293)Z - 6.8 m/s Average directional heading = 135 SE For13 km < z < 20 km Vm = (-0.003401)Z + 64.4457 m/s Average directional heading = 258 WSW For20 km < z < 30 km Vm = (0.0017857)Z - 32.14 m/s Average directional heading = 258 WSW EOSS 73: For 0 < z < 12 km Vm = (0.0025263)Z - 0.84 m/s Average directional heading = 79º ENE (Where Vm = mean wind speed (m/s), and Z = altitude (m))

  14. Wind Gust Speeds Determined through Pitot tube measurements. A FFT analysis showed no significant frequencies in the energy spectrum. Mean Wind Gust Speeds: EOSS 71: Equation 1 Vg = [(7.143E-4)Z + 2] m/s EOSS 73: Equation 2 Vg = [(8.5E-4)Z + 2] m/s (Where Z = altitude (m))

  15. Conclusions • Mission goals were met. • Need for planetary explorer pre-landing probe. • Improvement of weather models.

  16. References NASA: http://marsweb.jpl.nasa.gov/msp98/msss/mardi_hardware/history/huygens/index.html http://marsweb.jpl.nasa.gov/msp98/lander/m9821.jpg National Oceanic and Atmospheric Administration (NOAA): http://www.noaa.org/ http://www.npoess.noaa.gov/images/wind_speed.jpg

  17. Questions ?

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