Estimation of the Effect of Green Water and Bow Flare Slamming on the Wave-Induced Vertical Bending Moment Using Closed-Form Ex-pressions

Jørgen Juncher Jensen, A. E. Mansour, R. Eatock Taylor (Editor)

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

ABSTRACT: The effect of impulsive loads like slamming and green water on deck on the wave-induced bending mo-ment is estimated by a semi-analytical approach. The impulse loads leading to transient vibrations are described in terms of magnitude, phase lag relative to the wave-induced peak and decay rate. These loads can be due to bow flare slamming, bottom slamming or green water loads as they all can be characterised by a short duration relative to the wave cycle. The magnitude of the bow flare slamming loads is estimated using accurate results from wedge-shaped sections, Zhao and Faltinsen (1993) and for green water loads the results from Buchner (1995) and Wang et al .(1998) are applied. The phase lag relative to the wave-induced peak and the decay rate are derived mainly from published experimental results, Sikora, (1998). The results are given in closed-form expressions and the required input information for the procedure is restricted to the main ship dimensions: Length, breadth, draught, block coefficient and bow flare coefficient together with speed and heading. The formulas make it simple to obtain quick estimates in the conceptual design phase and to perform a sensi-tivity study of the variation of the ship¿s main dimensions and operational profile. The procedure is applied to three tankers of different length and to a high speed ferry sailing in restricted water. The re-sults obtained are compared to results obtained by use of current classification rules.
Original languageEnglish
Title of host publicationProceedings of the 3rd International Conference on Hydroelasticity in Marine Technology
Place of PublicationOxford, UK
PublisherThe University of Oxford
Publication date2003
Pages155-161
Publication statusPublished - 2003
Event3rd International Conference on Hydroelasticity in Marine Technology - Oxford, United Kingdom
Duration: 15 Sep 200317 Sep 2003

Conference

Conference3rd International Conference on Hydroelasticity in Marine Technology
CountryUnited Kingdom
CityOxford
Period15/09/200317/09/2003

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