تخمین نیروی هیدرودینامیکی امواج وارد بر سازه‌های لاغر دریایی به روش SI

Waves exert one of the most important forces on offshore and coastal structures as well as floating vessels. However, due to the random nature of waves, estimation of their hydrodynamic forces on marine structures is very complicated. Morison's semi-empirical model, is one of the models capable of estimating wave forces on slender cylindrical elements of marine structures. In this research using large scale experimental results in wave flume, the effect of random waves on rough vertical cylinders will be considered. Water particle kinematics was estimated using non-linear Stokes fifth order theory (i.e. Fenton Method). Finally, System Identification method known as SI method was utilized in order to determine hydrodynamic coefficients in Morison's equation. Comparison of measured and estimated hydrodynamic force by Morison's equation showed that although Morison's equation is most applicable and available routine for estimation of wave forces on slender cylindrical elements, its errors in safe side is considerable.