Important Seakeeping and Wave load Problems of Offshore Structural Design


Seakeeping ability or seaworthiness is a measure of how well-suited a watercraft is to conditions when underway. A ship or boat which has good seakeeping ability is said to be very seaworthy and is able to operate effectively even in high sea states. Whereas wave loading is most commonly the application of a pulsed or wavelike load to a material or object. This is most commonly used in the analysis of piping, ships, or building structures which experience wind, water, or seismic disturbances. 

Most Common Seakeeping & Wave load problems are –

§  Local Motions
§  Accelerations
§  Slamming
§  Water on Deck
§  Breaking Waves
§  Liquid Sloshing
§  Wave bending moments and shear forces

Fig: Examples of important seakeeping and wave load problems for ships

Vertical accelerations and relative vertical motions between the ship and the waves are important responses. Accelerations determine loads on cargo and equipment and are an important reason for seasickness. The relative vertical motions can be used to evaluate the possibility and damage due to slamming and water on deck. Slamming means impact between the ship and the water. For a ship it is important to avoid slamming as well as water on deck because of the resulting local damage of the structures.

Another important reason for capsizing of smaller ships is breaking waves. Liquid sloshing in tanks may be a problem for bulk ships, combination ships oil-bulk-ore (OBO), liquid natural gas (LNG) carriers and tankers loading at offshore terminals. Liquid sloshing can cause high local pressures as well as large total forces. For larger ships, wave-induced bending moments, shear forces and torsional moments are significant.

Tags: wave load analysis, wave load on a offshore structures, wave load determination, wave load example, wave load morison equation, wave loads analysis, seakeeping analysis, sea-keeping ability, sea-keeping definition


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