Modification of endurance wave analysis based on New-wave theory

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Modification of endurance wave analysis based on New-wave theory

Saeed Mohajernassab, Mohammad Ali Dastan Diznab, Hamid Mehdigholi, Mohammad Saeed Seif∗ and

Mohammad Reza Tabeshpour

Department of Mechanical Engineering, Center of Excellence in Hydrodynamics and Dynamics of Marine Vehicles, Sharif University of

Technology, Tehran, Iran

(Received 30 June 2014; accepted 28 January 2016)

The main objective of this investigation is to modify endurance wave analysis (EWA) based on New-wave theory for

convenient assessment of offshore structures under extreme waves. EWA is a novel time history based approach to evaluate

structural performance in various excitation levels of wave loading by intensifying wave records. In this article, modifications

are proposed to determine appropriate time duration and intensifying trend for reliable and practical assessment of offshore

structures. In this way, a simplified model of a real jacket platform is utilised to investigate the application of this approach

under extreme wave conditions in the Persian Gulf and results are compared with typical three hour random wave simulations.

It is shown that in extreme waves, except resonance states, proposed method can estimate the structural response with

acceptable accuracy and very low computational costs.

Keywords: New-wave theory; endurance wave analysis; jacket platform; extreme waves; assessment

 

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