Quantitative analysis of hydroelastic characters for one segment of hull structure entering into water

A methodology is presented to quantify the hydroelastic effects on the impact pressure and stress responses, by combining the numerical method and the experimental method. For the numerical method, it combines the CFD and FEM solvers to provide the uncoupled solutions, where the hydrodynamic pressure was predicted by the VOF method and the structural deflection was obtained by the FEM analysis. Numerical results are verified by comparing the published results. For the experimental method, a series of drop tests of one segment of the hull structure was carried out to obtain fully coupled solutions. Experimental uncertainties were analyzed through the repeatable tests and symmetrical analysis. In order to correct the experimental data, we introduced the wavelet transform and excluded the experimental noise in the measured data. Hydroelastic effects are divided into two categories: kinematic effects and inertial effects, and they are quantified by defining the pressure and stress factors, respectively. Finally, the hydroelastic effects were discussed in terms of impact velocity and the mechanics causing these oscillations is analyzed through dry modal analysis.