Session: 06-08-02 Model Tests

Submission Number: 157226

Experimental Investigations of Global Motions and Loads of Containership 

A fully elastic containership model was tested in head sea and quartering sea conditions with different wave steepness and towing speeds. The amplitude of heave motion increases with forward speed in both wave directions. In high speed case (Fr=0.25), the amplitude of heave motion decreases with wave steepness near the resonance frequencies. This is not observed for low speed case (Fr=0.15). Similar findings are observed for pitch motion. The amplitude of roll motion increases with forward speed for the tested waves in quartering sea conditions.

The vertical bending moment, vertical shear force and torsional moment was investigated in this study. Non-linear global loads were observed in large wave amplitude cases. The amplitude of second harmonic components of vertical loads can go as high as 30% of the amplitude of first harmonic components. Non-linear effects on these global loads were also observed in high speed cases, but not as strong as large wave amplitude cases. In both wave directions, the amplitude of the first harmonic components of the vertical loads increases with forward speed and they are not affected too much by the wave amplitude. The amplitude of the first harmonic components of torsional moment in quartering sea conditions are not affected by the vessel speed or wave amplitude.

Presenting Author: Yingying Chen TCOMS

Presenting Author Biography: Ms. Yingying Chen, a Senior Research Engineer at Technology Centre for Offshore and Marine, Singapore (TCOMS). Her research currently focuses on structural health monitoring, digital twinning of marine structures, data-drive model of marine structures, fluid-structure interaction, and hydro-elasticity. Prior to this position, she worked at National University of Singapore and American Bureau of Shipping on Arctic technology, including ice load estimation, design of ice-capable structures, Arctic regulations, and structural analysis of offshore and marine structures. Master and Bachelor degree from Dalian University of Technology, China.