Experiment in Parachute-opening Shock of Life-saving Parachute and Dummy High-speed Airdrop
LIU Danyang;JIA Yuehong;YANG Chunxin;WANG Lu;SONG Binghui;School of Aeronautic Science and Engineering,Beihang University;Aerospace Life-support Industries;
In the shock test of rigid and soft dummy,the overload signal of dummy censorial is decomposed into different temporal and frequency components using wavelet theory.The evolution of chaotic characteristics in varying temporal and frequency scales is examined as well.High-speed airdrop experiment of rigid dummy is also carried out and the relationship between parachute-opening shock and posture of dummy is analyzed using phase plane.Results show that the energy of dummy censorial centralized in frequency range of 30Hz to 50Hz and the soft dummy can better buffer high frequency shock than rigid.High frequency wavelet detail components are more random,in which the magnification error is higher so that the high frequency components should be filtered,when extract real shock value of rigid dummy.The pull-out shock and parachute-opening shock present a negative correlation.The strong dependence of parachute-opening shock on attitude angle and angular velocity of dummy indicates that there exists a advantageous parachute-opening area in phase plane.
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