Vulnerability assessment procedure for the warship design including the effect of shotline and penetration of fragments

초록

Warship combat survivability is defined as the capability to withstand a hostile attack weapon. Warship survivability is mainly composed of three estimations such as susceptibility, vulnerability, and recoverability. One of the important parts in warship survivability assessment is to calculate the vulnerability when it is subjected to the multiple hits by penetrators or blasting. At present, simplified vulnerable area method is one of the most efficient methods for calculating the vulnerability of warship. Meanwhile it is assessed on the assumption that kill-probability given a hit PK/H can be calculated by vulnerable area. However, it does not consider the direction of shotline and its penetration depth because it assumes the constant vulnerable area for a given hit. To get the more realistic estimation of vulnerability of warship, the direction of shotline and penetration depth of each component is combined to the vulnerable assessment that is based on the simplified vulnerable area method. The critical components of warship are modeled by hexagonal box. The hexagonal representation of each component under threat being hit along the shot line can consider the component thickness, material, overlapping relationship of components, mass of fragment, velocity of fragment, and obliquity of shot line with respect to the component surface. By applying the shot lines of fragments on each component, the component’s vulnerability can be updated according to the velocity and mass of the fragment. This study, firstly, suggest the general procedure to assess the vulnerability of warship. Thereafter, we suggest examples to explain the proposed method.