Dynamical response analysis of incautious water entry of UUV based on exact body shape approach

It is a great interest in achieving a practical approach to predict and assess the dynamical behavior of UUV (Unmanned Underwater Vehicle) during incautious water entry or its launching. In this paper the oblique water-entry impacting model of UUV is established based on exact body shape approach during the initial stage of UUVpsilas entering the water surface. In the theoretic model a wetted correction factor is introduced in order to substitute free water surface with equivalent water surface. The approach is applied to the water impact of UUV with ogive cap during approximate horizontal impact as well as vertical impact. And the same time, the external impact loads is calculated analytically. The result of implementation is demonstrated the oblique water-entry model provides reasonable estimates of the impact loads, and provides valuable preference for the structure design of UUV.