National Superior School of Mechanics and Microtechnics

STUDY OF A PROPULSION SYSTEM FOR A MINI UAV - µDRONE PROJECT

Micro-UAV 2004 exhibition

ONERA/DGA COMPETITION

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SUMMARY• Framework

– The ONERA/DGA competition– Particularities of the µdrone

• Propulsion – The propulsive system– Propeller optimization

• Conclusion

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FRAMEWORK

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ONERA/DGA competition

Main performances :

• independence,• simplicity of use,• miniaturization,• innovation,• endurance,• etc…

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ENSMM’s µdrone

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Particularities of the µdrone1 - Propulsion based on two coaxial propellers

Motors

Two propellers

Transmission by spiro-conic gears

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Particularities of the µdrone2 - Autopilot controls speed, trajectory and

UAV stability

Camera

Detection system

Ground station

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Particularities of the µdrone3 - Obstacles detection system

4 transductors

Module inside the streamlined ducted fan

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Particularities of the µdrone4 - Panoramic observation of the environment

using conical mirror

Cameras Conical mirror

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PROPULSION

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Motors

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Batteries

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Coaxial rotor (1/2)

• 16 to 22% more efficient

• 35 to 40% smaller

• T2=0.88*T1

M M

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Coaxial rotor (2/2)

• Gap between propellers : H=D/10

• Spiro-conics gears

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Ducted fan

• Noise reduction

• Venturi effect

• Divergent exit section

• Streamlined outer profile

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Displacement

• Two separated movements

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Propellers optimization

• Goal : meet a specified technical

file

• Methods used : theory of blades element swirl propeller theory

• Matlab programs

• Results and validation

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CONCLUSION

• Last choices

• End 2004 : prototype building

• > January 2005 : tests and adjustment

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ACKNOWLEDGEMENTS

• To the DGA for their financial support

• To the experts and ENSMM teachers for their advice

• And to the former ENSMM teams

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THANKS FOR YOUR ATTENTION