Hydroelastic analysis of an elastic thin-walled structure obliquely impacting a calm water surface

To elucidate the oblique impact mechanism of thin-walled structures, a drop experiment is carried out on an elastic structure with a drop height ranging from 250 mm to 900 mm and an inclination angle ranging from 0 degrees to 20 degrees The basic hydrodynamic characteristics, including the impact load and stress response, are clarified through combination with modal analysis. Although the leeward side has a small hydrodynamic load, the stress level on this side is close to that on the windward side. The importance of oscillation sources (including the vibration of the experimental system, the hydroelastic effect and the fluid oscillation) was identified by the wavelet transform, which shows the advantages in clarifying the multiple vibrations induced by the close frequency. The influence of the inclination angle on pressure and stress is further discussed, revealing that the inclination angle greatly increases the impact pressure, but the influence on the stress response is irregular. The nondimensional coefficients at different drop heights still exhibit obvious irregularities, which are related to fluid oscillations. These findings further confirm the complexity of the structural response to asymmetric slamming.