Statistical Analysis of Low Frequency Responses of a Moored Floating Offshore Structure (1st Report)

概要

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The purpose of this paper is to estimate the response statistics of a moored floating structure that can be modelled as the two term Volterra series expansion subjected to a stationary Gaussian random waves. For estimating the instantaneous probability density function of response the approximate method using the finite Gram-Charlier expansion and the asymptotic form of the exact solution which can be obtained from Kac-Siegert method is proposed. In order to estimate the probability density function of extremal values consisting maxima and minima and the extreme responses the assumptions in which response and response velocity are mutually independent and the velocity is a Gaussian process with zero mean are introduced in addition to Powell's assumptions in the field of structural dynamics. The frequency properties have been found experimentally through cross spectral and cross bispectral analyses. Comparisons between the experimental results and the statistical ones estimated from the frequency properties of response are discussed. As the results it has been confirmed that both results show a fairly good agreement.
独立行政法人海上技術安全研究所の論文
1986-09-30