Experimental investigation on the slamming loads of a rigid cylinder

This paper investigates the hydrodynamic characteristics of a two-dimensional rigid cylinder during water entry via a series of drop tests. Due to the high-frequency and highly transient features of slamming pressure, a reasonable response measurement and analysis method is proposed by conducting modal analysis and performing comparative verification of sensors with different working principles. On this basis, a comprehensive dataset of slamming dynamics and kinematics is acquired, and data analysis verifies the high repeatability of the experimental results. The experimental results show that the dispersion of slamming pressure peaks at the cylinder bottom is significantly greater than that at other positions. One way ANOVA shows a significant difference in pressure dispersion among different deadrise angle groups (p < 0.01)**. In contrast, no significant difference is observed under different impact velocities or sensor flatness conditions. Combined with CFD numerical simulations, air cushioning effect is observed within the 0~5 deg at the model bottom. The high consistency between numerical simulations and experimental data validates the effectiveness of the proposed analysis framework. This work improves the experimental techniques for slamming load evaluation, and provides a solid physical and numerical foundation for the water entry analysis of curved marine structures.