Wave motions based on 2D strip theory of and loads on ships moving with forward speed.
Wave loads on slender structures
Waveship computes the response in regular waves for a ship with forward speed using Strip Theory. Strip Theory is linear, which implies that all amplitudes are assumed small in magnitude, and that all responses are harmonic and proportional to the amplitude of the incoming waves. This gives, added mass and damping, excitation forces and rigid body motion in the six rigid body degrees of freedom, as well as shear force, bending-moments and torsional moment for any cross-section along the ship. Waveship may also compute transfer functions of second order mean wave drift forces, and pressure distribution on the hull surface.
Key Features
- Calculation of hydrostatic and inertia properties
- Calculation of global response variables, including:
- Wave excitation forces and moments
- Hydrodynamic added mass and damping
- Rigid body motions
- Sectional forces and moments
- Constant drift forces and moments - Load generation for subsequent structural analysis in the form of surface pressure loads for structural shell/solid element analysis, the loads may be in time or frequency domain
The hydrodynamic analysis is based on strip theory utilising
- Haskind relation
- Diffraction solution
The Haskind relation may be used for calculating global response such as total excitation forces and corresponding motion transfer functions. The diffraction solution may be used both for calculation of global response and for generation of the distributed loading on an element level. Airy wave theory is applied and results are presented as complex transfer functions or as deterministic results for given phases of the waves.