Stochastic hydroelastic analysis of very large （随机的水弹性分析非常大）.pdf

Appeared in: Probabilistic Engineering Mechanics, 2013, 33: 26-37. Stochastic hydroelastic analysis of pontoon-type very large floating structures considering directional wave spectrum 1,2* 3 1 3 Iason Papaioannou , Ruiping Gao , Ernst Rank , Chien Ming Wang 1Lehrstuhl für Computation in Engineering, Technische Universität München, 80290 Munich, Germany 2Engineering Risk Analysis Group, Technische Universität München, 80290 Munich, Germany 3Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge 119260, Singapore * Corresponding author. Email: iason.papaioannou@tum.de Abstract The hydroelastic response of pontoon-type very large floating structures (VLFS) is obtained by resolving the interaction between the surface waves and the floating elastic body. We carry out the analysis in the frequency domain, assuming that the surface waves can be described by a directional wave spectrum. The response spectra can then be computed by application of stationary random vibration analysis. Applying the modal expansion method, we obtain a discrete representation of the required transfer matrices for a finite number of frequencies, while the influence of the wave direction is obtained by numerical integration of the directional components of the spectrum. Moreover, assuming a Gaussian input, we can apply well known approximations to obtain the distribution of extremes. The method is applied to an example VLFS and the effect of different mean wave angles on the stochastic response is investigated. Keywords Hydroelasticity, VLFS, directional spectrum, random vibration, response statistics, distribution of extremes. 1 1. Introduction Very large floating structure (VLFS) technology is an