Study of the Parameters of Anchor Body in-Water Motion in the Array Anchor Technique

Abstract

When the rocket anchor enters the water, the projectile body hits the water surface and is subject to a great impact force, which may cause the failure of the internal zero devices and the damage of the anchor structure in serious cases, leading to the failure of the breach sealing mission. Therefore, it is particularly important to study the load characteristics of the anchor body in the process of water entry. In this paper, a numerical simulation of the anchor body in the process of water entry is carried out, focusing on the load distribution of the projectile body and other situations, which can provide certain guidance and reference for the structural design of the rocket anchor. In this paper, based on the LS-DYNA module in Workbench, the flow-solid coupling numerical simulation of the anchor body water entry process is carried out by using the ALE method, and the motion law and load distribution of the anchor body under different water entry speeds, different water entry angles and different sizes are investigated and the pressure distribution of the flow field is analyzed, and the equivalent stresses of the upper, middle and lower parts of the rocket anchors under different working conditions are compared and analyzed. analyzed. The results show that the maximum impact force of the anchor body at water entry is linearly related to the water entry velocity, and reducing the water entry angle can effectively reduce the maximum impact force on the rocket anchor itself; for the rocket anchor structures with different sizes, the change of the force in the lower part is positively correlated to the size of the structure; the change of the stress in the middle part is not obvious; and the equivalent force in the upper part is in a fluctuating state, and with the increase of the structure of the rocket anchor, the smaller the fluctuating peak value is.