This paper deals with fatigue damage estimation from the analysis of full-scale stress measurements in the hull of a large container vessel (9,400 TEU) covering several months of operation. For onboard decision support and hull monitoring sys-tems, there is a need for a fast reliable method for esti-mation of fatigue damage in the ship hull. The objective of the study is to investigate whether the higher frequency contributions from the hydroelastic responses (springing and whipping) can satisfactory be included in the fatigue damage estimation by only a few parameters derived from the stress power spectrum as an alternative to rainflow counting. The outcome of rainflow counting is compared with the results of a narrow-band spectral analysis as well as the outcome of three approaches considering the process as bimodal in order to take the hydroelastic responses into account. In most cases, the spectral analysis show satisfactory agreement with the results from rainflow counting.
Proceedings of the Prads 2013, 2013
Main Research Area:
12th International Symposium on Practical Design of Ships and Other Floating Structures, 2013