Abstract
The hydroelastic vibrational responses of a large ship sailing in regular and irregular head waves are investigated numerically and experimentally. A 3D time-domain nonlinear hydroelastic mathematical model is established in which the hydrostatic restoring forces and incident wave forces are calculated on the instantaneous wetted hull surface to consider nonlinear effects of the rigid motion and elastic deformation of the hull in harsh waves. Radiation and diffraction wave forces are computed on the mean wetted surface based on the 3D frequency-domain potential flow theory. The slamming loads are calculated by momentum theory and integrated into the hydrodynamic forces. The 1D Timoshenko beam theory is adopted to model the vibrational structural response and is fully coupled with the presented hydrodynamic theory in time-domain to generate the hydroelastic equation of motion. Moreover, self-propelled segmented model tests were conducted in a laboratory wave tank to experimentally investigate the hydroelastic responses of a target ship in regular and irregular head seas. The numerical and experimental results are systemically compared and analyzed, and the established hydroelastic analysis model turns out to be reliable and effective in the prediction of ship hydroelastic responses in waves.
Highlights
Structural evaluation of marine vessels during their design stage relies on accurate prediction of hydrodynamic loading and subsequent wave-structure interactions
The results indicate trough significant values ofbetween both heave and pitch motions appear tosignificant be larger for higherfor speed that and good agreement is achieved experimental and numerical values peaks condition, probably due to the insufficient consideration of nonlinearities associated with ship velocity and troughs of motion responses, with the difference being less than 16.84%
The present research proposes a 3D time domain nonlinear hydroelastic method to numerically estimate the vibrational responses of a large ship advancing in regular and irregular waves
Summary
Structural evaluation of marine vessels during their design stage relies on accurate prediction of hydrodynamic loading and subsequent wave-structure interactions. For the cases where the elastic deformation of the structure plays a negligible role in determining the hydrodynamic forces, the structural analysis can be performed separately from the hydrodynamic analysis. Large vessels with pronounced bow flare are susceptible to frequent and severe wave impact, subjecting them to subsequent significant transient hull vibrations, called whipping, which inevitably interferes with the surrounding fluid field and violates the basic assumption of the conventional decoupled method mentioned above. Hydroelasticity theory sufficiently considers the effects of structural vibrational responses on the hydrodynamic forces, and provides a framework in which structural and hydrodynamic analyses are fully coupled. Research on robust and efficient numerical methods for evaluation of ship wave loads and structural responses is still in progress. Bishop and Price [1] first introduced the methodology of hydroelasticity into ship engineering, paving the way for the following fruitful development
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