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http://dx.doi.org/10.3744/SNAK.2018.55.6.466

A Study on Fatigue Analysis of Non-Gaussian Wide Band Process using Frequency-domain Method  

Kim, Hyeon-Jin (Department of Naval Architecture and Ocean Engineering, College of Engineering, Seoul National University)
Jang, Beom-Seon (Research Institute of Marine Systems Engineering, Department of Naval Architecture and Ocean Engineering, College of Engineering, Seoul National University)
Publication Information
Journal of the Society of Naval Architects of Korea / v.55, no.6, 2018 , pp. 466-473 More about this Journal
Abstract
Most frequency domain-based approaches assume that structural response should be a Gaussian random process. But a lot of non-Gaussian processes caused by multi-excitation and non-linearity in structural responses or load itself are observed in many real engineering problems. In this study, the effect of non-Normality on fatigue damages are discussed through case study. The accuracy of four frequency domain methods for non-Gaussian processes are compared in the case study. Power-law and Hermite models which are derived for non-Gaussian narrow-banded process tend to estimate fatigue damages less accurate than time domain results in small kurtosis and in case of large kurtosis they give conservative results. Weibull model seems to give conservative results in all environmental conditions considered. Among the four methods, Benascuitti-Tovo model for non-Gaussian process gives the best results in case study. This study could serve as background material for understanding the effect of non-normality on fatigue damages.
Keywords
Fatigue analysis; Wide-band process; Non-Gaussian process;
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