Dynamics Sensitivity Analysis for Steady Descent Phase of Heavy Cargo Airdrop

The structural parameters and meteorological conditions in the airdrop steady descent phase affect the precise and safe landing of the cargo, and it is an urgent need to carry out the sensitivity analysis of steady descent phase heavy cargo airdrop. In this paper, based on the direct differentiation method and the reduced multibody system transfer matrix method, a dynamic sensitivity analysis method for the steady descent phase of cargo airdrop is established, which is high programming and has a fast computational speed. This method avoids the cumbersome formula derivation of the usual differential sensitivity analysis method. The effects of cargo mass, main parachute area and wind speed on cargo landing displacement, speed and attitude are analyzed. The results show that the cargo landing displacement, velocity, and attitude angle are insensitive to the cargo mass and parachute nominal area, and sensitive to the wind speed. The results lay a foundation for the optimal design of cargo airdrop dynamics.