Journal of Astronautics ›› 2021, Vol. 42 ›› Issue (11): 1355-1364.doi: 10.3873/j.issn.1000-1328.2021.11.002

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Study and Experimental Verification on Dynamic Magnification Factor of Parachute Inflation and Ejection Loads of Mars Entry Vehicle

WANG Gang, YANG Chang hao, QI Yu feng   

  1. Beijing Institute of Spacecraft System Engineering, Beijing 100094, China
  • Received:2020-08-31 Revised:2021-03-08 Online:2021-11-15 Published:2021-11-15

Abstract: Firstly, the analytical formulas of the dynamic magnification factor with the pulse time of the response spectrum of a single degree of freedom system under the rectangular and half sine pulse are derived. Then the parachute inflation and ejection low frequency high shock load dynamic simulation model of the Mars entry vehicle is built based on abaqus explict dynamics, and the influence of the shock load shape, load time and load damping are analyzed. Finally, the experiments of the opening parachute load suspension impact dynamic load and the parachute load real parachute impact dynamic load are carried out.The results show that the structure responds decline when the shock load time is less than  1 ms , and the static equivalence load becomes steady when the load time is longer than 5 ms; the dynamics equivalence load of the parachute inflation is about 1 time than static because of the smooth time wave, but the parachute ejection’s is about 1~2 times than static due to the steep rectangle wave. 

Key words: Shock load, Mars entry, Parachute inflation and ejection, Dynamic magnification

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