英语翻译6ResultsStudy of the cross structure design wave loads f

英语翻译
6
Results
Study of the cross structure design wave loads for a trimaran in regular and irregular waves
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船 舶力 学
第
15
卷 第
3
期
usin g model testing method is presented in this paper.And the extrap olated resu lts of these
transverse wave loads were given using some model testing results in irregular wave.Evaluation
of these transverse wave loads of a trimaran using LR rules was also performed in this paper.
From the comparison among the above model testing results,extrapolated results and rule cal-
culations,some valuable results were obtained:
(1) Msp was bigger in beam wave than that in oblique wave.However,it was difficult to
obtain the Msp values in shorter wave lengths because of the limitation of wave making abili-
ty.The peak value of Msp in heading oblique waves was greater than that in following oblique
waves,and the peak of responses located at the ratio of wave length to ship length being about
0.9.
(2) The transverse wave loads of cross structure had a notable nonlinearity to wave heights.
These transverse wave loads from LR rule calculations might cor respond to the r egular wave
height (full amplitude) 6.0m.
(3) The inapparent asymmetry of hogging and sagging parts of moment from rule calcula-
tions was much more notable than that from model test results.It might be caused by more con-
siderations of nonlinear features of these cross structure wave loads.
(4) For different type of transverse wave loads,the extrapolated value with 99 percents
probability guarantee to transverse torsional Mtt was greater than that from rule calculations.
However,the extrapolated value of splitting moments Msp and splitting shear force Q sp were
corresponding to that from rule calculations.It indicates that the evaluation methods from LR
rules are nonconservative for the cross structure design of transverse torsional moments Mtt.
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