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BLIMPS

MEAM 610. BLIMPS. Mohit Bhoite and Saurabh Palan. Introduction. Blimps Anatomy Design Control Sensing. Anatomy of a Blimp. “A blimp, or non-rigid airship, is an airship without an internal supporting framework or keel.” - wiki. Stabilizers . Envelop. Motors. Propellers. Gondola.

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BLIMPS

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  1. MEAM 610 BLIMPS Mohit Bhoite and Saurabh Palan

  2. Introduction • Blimps • Anatomy • Design • Control • Sensing

  3. Anatomy of a Blimp “A blimp, or non-rigid airship, is an airship without an internal supporting framework or keel.” - wiki Stabilizers Envelop Motors Propellers Gondola

  4. HELIUM - Calculating Lift • At standard temperature and pressure, mass density of • Air : ρair= 1.293 kg/m3 • Helium : ρHe=0.178 kg/m3 • Neon: ρHe= 0.9 kg/m3 Wload = [(ρair– ρHe) x volume – Wenv] Kg Grade A Helium gas = 99.995% He and 0.005% Ne Wload= [(ρair-0.99995ρHe - 0.00005ρNe) x volume – Wenv] Kg

  5. HELIUM - Calculating Lift Wload= [1.1149 x volume – Wenv] Kg Thumb rule : 1m3 of helium can lift 1.1 kg of load

  6. Latex Balloons vs. Rigid Envelops • Which one is better? • Balloons have internal pressure much higher than atmospheric => unnecessary helium mass => no extra lift • Rigid envelops will have pressure equivalent to atmospheric pressure => better efficiency

  7. Envelop Designs

  8. Envelop Designs $25, 7cu feet • Off-the-shelf Options • Cost $12 $13, 5cu feet $4, 3’ dia

  9. Propulsion • DC Brushed motors + Propellers • Flapping wings/fins !

  10. Propeller Placements

  11. Propeller Placements

  12. Propeller Placements

  13. Controller Architecture Sensors Main Controller (uP, uC) Motor Driver Motors, Servos Camera Wireless Link

  14. Sensors • Gyros • Acceleros • GPS • Digital Compass • Ultrasonic • Pressure sensor • IR • Vision

  15. Sensors • Gyros • Acceleros • GPS • Digital Compass • Ultrasonic • Pressure sensor • IR • Vision

  16. Digital Compass Devantech, acroname.com, $57

  17. Digital Compass • I2C interface • 2.7 to 5.2V supply range • 1 to 20Hz selectable update rate • True drop-in solution • 0.5 degree heading resolution • 1 degree repeatability • Supply current : 1mA @ 3V Sparkfun.com, $60

  18. Pressure Sensors • Barometric pressure sensing for altitude measurement • Can achieve resolution of about 10cm at sea level • Pressure decreases at the rate of 100 millibars per 800 meters $55

  19. Thank you!

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