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Low-overload internal ballistics in UAV ejection using multiple time-sequenced compressed-air chambers.

Tian Li1,2,3, Zhai-Jun Lu1,2,3, Zhi-Fu Wang4,5,6

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Summary
This summary is machine-generated.

A novel multi-chamber ejection system significantly reduces launch overload for unmanned aerial vehicles (UAVs) by using time-sequenced actuation. This method achieves high launch velocity with lower structural stress, improving UAV design and cost.

Keywords:
Compressed-air ejectionLow-overload launchMulti-chamberTime-sequenced actuationUnmanned aerial vehicle

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Area of Science:

  • Aerospace Engineering
  • Mechanical Engineering
  • Applied Physics

Background:

  • Compressed-air ejection systems launch unmanned aerial vehicles (UAVs) using high flow rates, causing significant overloads.
  • These overloads impose strict structural requirements on UAVs, increasing weight and cost.

Purpose of the Study:

  • To propose and analyze a multi-chamber ejection method with time-sequenced actuation for UAVs.
  • To reduce launch overload while maintaining high launch velocity.

Main Methods:

  • Developed and validated an internal ballistics model incorporating real-gas properties for UAV compressed-air ejection.
  • Simulated the performance of multi-chamber (two or three) ejection systems with varied chamber configurations.

Main Results:

  • Multi-chamber systems significantly reduced maximum overload compared to single-chamber systems.
  • Overload reductions were 20.91% (two identical chambers), 26.08% (two different chambers), and 33.24% (three different chambers).
  • The required muzzle velocity was maintained across all tested configurations.

Conclusions:

  • The proposed multi-chamber ejection strategy effectively mitigates launch overload for UAVs.
  • This approach offers a viable solution for designing lighter and more cost-effective UAVs.
  • Time-sequenced actuation in multi-chamber systems is key to balancing launch performance and structural integrity.