International Journal of Aeronautical and Space Sciences

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Shape and Orifice Optimization of Airbag Systems for UAV Parachute Landing

  • Alizadeh, Masoud (Department of Aerospace Engineering, Sharif University of Technology) ;
  • Sedaghat, Ahmad (Department of Mechanical Engineering, Isfahan University of Technology) ;
  • Kargar, Ebrahim (Department of Aerospace Engineering, Malek Ashtar University of Technology)
  • Received : 2014.06.30
  • Accepted : 2014.09.05
  • Published : 2014.09.30
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Abstract

An airbag is an important safety system and is well known as a safety system in cars during an accident. Airbag systems are also used as a shock absorber for UAVs to assist with rapid parachute landings. In this paper, the dynamics and gas dynamics of five airbag shapes, cylindrical, semi-cylindrical, cubic, and two truncated pyramids, were modelled and simulated under conditions of impact acceleration lower than $4m/s^2$ to avoid damage to the UAV. First, the responses of the present modelling were compared and validated against airbag test results under the same conditions. Second, for each airbag shape under the same conditions, the responses in terms of pressure, acceleration, and emerging velocity were investigated. Third, the performance of a pressure relief valve is compared with a fixed-area orifice implemented in the air bag. For each airbag shape under the same conditions, the optimum area of the fixed orifice was determined. By examining the response of pressure and acceleration of the airbag, the optimum shape of the airbag and the venting system is suggested.

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