The effect of whipping/springing on fatigue damage and extreme response of ship structures
Paper in proceedings, 2010

Wave-induced vibrations, also known as whipping and springing, are defined as high frequency response of ship structures. In this paper, the fatigue damage caused by whipping and springing is presented by investigating the amidships section of a 2800 TEU container ship that operates in the North Atlantic Ocean. A simplified fatigue model, originally from the generalized narrow-band approximation for Gaussian load, is employed to include the damage contribution from wave-induced vibrations. In this model, the significant response range hs and the mean stress up-crossing frequency fz are simplified using only the wave-induced loading and encountered wave frequency, respectively. The capacity and accuracy of the model is illustrated by application on the measurements of the 2800 TEU container ship for different voyages during 2008. The whipping-induced contribution to the extreme response is investigated by means of the level crossing approach. It shows that the level crossing model for Gaussian load cannot be used for the prediction of extreme responses, such as the 100-year stress, based on a half-year full-scale measurement. It is found that a more complicated non-Gaussian model is required to consider the contribution from whipping.

Rice’s formula

level up-crossing

whipping

springing

narrow-band approximation

Fatigue damage

extreme response

Author

Wengang Mao

Chalmers, Mathematical Sciences, Mathematical Statistics

University of Gothenburg

Jonas Ringsberg

Ship Design

Igor Rychlik

University of Gothenburg

Chalmers, Mathematical Sciences, Mathematical Statistics

Proceedings of The ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2010)

Vol. 2 123-131 OMAE2010-20124

The ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2010)
Shanghai, China,

Chalmers Area of Advance Transport – funding 2010

Chalmers, 2010-01-01 -- 2010-12-31.

Driving Forces

Sustainable development

Innovation and entrepreneurship

Areas of Advance

Transport

Roots

Basic sciences

Subject Categories

Other Materials Engineering

Vehicle Engineering

Probability Theory and Statistics

DOI

10.1115/OMAE2010-20124

More information

Latest update

10/11/2018