Numerical Analyses of Heavy Equipment Airdrop with Cushion Airbag Landing Process Impacting the Rigid and Soil Ground

Abstract

The numerical results of heavy equipment airdrop based on rigid ground assumption cannot accurately simulate the landing attitude of airdrop,so it is necessary to study the cushioning performance of airdrop under soil ground. In order to study the suitable condition of rigid ground,the LS-SDYNA software is used to simulate the landing process,and to compare the performance of the airdrop system under the rigid and soil ground. Meanwhile,the effect of different lateral wind velocities on the airdrop impact performance is analyzed. The results show that the difference of the maximum overload of the cargo is very small between the case of the rigid and the soil ground when the airdrop system only strikes the ground perpendicularly. The difference is much greater and the deformation effect of soil ground is significant under lateral wind conditions. Therefore,soil ground should be used for simulation with lateral wind. Under soil ground the larger of the lateral wind velocity and the initial vertical velocity,the larger of the vertical peak overload.

Keywords

• airdrop system
• soil model
• cushion airbag
• finite element
• soil deformation