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MEAM 610BLIMPSMohit Bhoite and Saurabh Palan
IntroductionBlimpsAnatomyDesignControlSensing
Anatomy of a Blimp“A blimp, or non-rigid airship, is an airship without an internal supporting framework or keel.” - wikiStabilizers EnvelopMotorsGondolaPropellers
HELIUM - Calculating LiftAt 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] KgGrade A Helium gas = 99.995% He and 0.005% NeWload= [(ρair-0.99995ρHe - 0.00005ρNe)  x volume – Wenv] Kg
HELIUM - Calculating LiftWload= [1.1149 x volume – Wenv] KgThumb rule : 1m3 of helium can lift 1.1 kg of load
Latex Balloons vs. Rigid EnvelopsWhich one is better?Balloons have internal pressure much higher than atmospheric => unnecessary helium mass => no extra liftRigid envelops will have pressure equivalent to atmospheric pressure => better efficiency
Envelop Designs
Envelop DesignsOff-the-shelf OptionsCost$25, 7cu feet$12$13, 5cu feet$4, 3’ dia
PropulsionDC Brushed motors + PropellersFlapping wings/fins !
Propeller Placements
Propeller Placements
Propeller Placements
Controller ArchitectureSensorsMain Controller(uP, uC)Motor DriverMotors, ServosCameraWireless Link
SensorsGyrosAccelerosGPSDigital CompassUltrasonicPressure sensorIRVision
SensorsGyrosAccelerosGPSDigital CompassUltrasonicPressure sensorIRVision
Digital CompassDevantech, acroname.com, $57
Digital CompassI2C interface
2.7 to 5.2V supply range
1 to 20Hz selectable update rate

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Blimps