Journal of Dalian Maritime University >
2018 , Vol. 44 >Issue 1: 41 - 47
DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2018.01.007
Two direct fatigue calculation methods for ship structures under broadband random loading
Received date: 2017-06-05
Revised date: 2017-08-01
Online published: 2017-08-01
In view of the problem that the alternative stress responses resulted from external load and waves loads were treated as a narrow band model in fatigue calculation process, while the actual sea state model was closer to a broadband mode, and the stress range distribution was considered as the breakthrough point, taking the real ship structure as the study object, the fatigue problems were resolved by using two direct calculation methods—HCSR and spectral analysis method under broadband random loads. For spectrometry based on Rice distribution, the approximate model of the equivalent stress range was set up under broadband loads. For direct calculation method based on HCSR, a continuous model—Weibull model was used to represent the stress range distribution model under broadband spectrum to solve the fatigue problem under broadband random loads. Results show that considering the influence of broadband factors, two kinds of methods while using different models, but the results are close to or the same trend, which prove that the two methods have certain feasibility to solve the fatigue problem of broadband, but spectral analysis method using a variety of equivalent stress model to calculate the fatigue strength under different bandwidth, therefore the results are more accurate and reliable.
ZHOU Chen-yan , ZHANG Jia-ning , SHEN Ya-zhou , ZHANG Tian-yi . Two direct fatigue calculation methods for ship structures under broadband random loading[J]. Journal of Dalian Maritime University, 2018 , 44(1) : 41 -47 . DOI: 10.16411/j.cnki.issn1006-7736.2018.01.007
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