WStrength

WStrength is an in-house software to compute the longitudinal loads acting on the ship hull in passing waves. It is based on the article Ship Motions and Sea Loads (1970) by professors Nils Salvesen, E. O. Tuck and Odd Faltinsen.

WStrength is fast! It efficiently computes the wave loads based on the wave pressure in each panel and the vessel’s motions RAOs (Response Amplitude Operators), which are Wamit’s outputs. It also considers the static loads on the vessel (modeled in Sstab) and computes the Shear Forces and Bending Moments RAOs for each longitudinal section for each heading and angular frequency.

Bending and Shear Amplitudes across the hull. These values are the line integrals of the respective RAOs for a given heading and frequency.

Given a sea state (direction of propagation and energy spectrum, such as JONSWAP or Pierson-Moskowitz spectra), WStrength also computes the response spectra of the Load, Shear and Bending and their statistics along the longitudinal direction such as Hmax, H1/3, H1/100, H1/1000, the spectral moments M0, M1 and M2 and the periods T1 And T2. The following figure displays the Hmax of Shear and Bending for a given Sea State. These values are essential in ship projects to avoid the collapse of the hull.

Wave Load RAO for a given heading and hull section.

Wave Load RAO’s phase for a given heading and hull section.

Shear and Bending RAOs on a selected hull section.

Shear and Bending Response Spectra for a given Sea State.

Example of a Sea State.

Results export feature. Tables of Load, Shear and Bending for each heading as functions of the period and arbitrary X coordinates.