Probabilistic Analysis of Characteristic Pressure for LNG Tanks

摘要: Background. New challenges in LNG shipping, such as ship size growth, trading routes with more severe weather conditions, need for operating unrestricted filling level and new propulsion systems attract very much attention marine offshore oriented community. One of the main concerns is prediction loads caused by violent fluid motion cargo tanks. In paper we address problem determining characteristic extreme values sloshing pressures structural design. This involves estimating a long-term period, tank, excited pressures, relevant responses. Method Approach. Ship analysis based on linear strip theory. order to investigate dependence response sea an approach statistical characteristics tank utilized well multimodal tank. However, appropriate theoretical/ numerical approach, which can be used realistic most pressure has not yet been developed. Thus, experiments are states chosen level. Results. Our contribution includes experimental short term distribution. The choice fit probability distribution models addressed, due account different physical mechanisms causing impacts. evaluated. critical areas briefly discussed. Appropriate dynamic structure needs investigated accounting temporal spatial loads. These two factors also addressed paper. variability results obtained processing data from multiple test runs Conclusions. three-parameter Weibull generalized Pareto fitted They prove accurately describe pressures. highest points underestimated both distributions. Generalized model conservative estimates. threshold peaks was investigated. Based this, it set 0.85-0.87 quantile peak values. big influence estimates reported. Uncertainty measured originating inherent exceeds uncertainty resulting form motions' variability. Moreover, higher