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Wind Farm Support Vessel Extreme Roll Assessment While Docking in the Bohai Sea

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China Ocean Engineering 2021年第2期35卷 308-316页

作者： XU Xiao-sen Oleg Gaidai Oleh Karpa WANG Jun-lei YE Ren-chuan CHENG Yong Marine Equipment and Technology Institute Jiangsu University of Science and TechnologyZhenjiang 212100China School of Naval Architeture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China EPAM Systems Ukraine School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China

Robust prediction of extreme motions during wind farm support vessel(WFSV)operation is an important safety concern that requires further extensive research as offshore wind energy industry sector *** particular,it is important to study the safety of operation in random sea conditions during WFSV docking against the wind tower,while workers are able to get on the *** is performed by thrusting vessel fender against wind tower(an alternative docking way by hinging is not studied here).In this paper,the finite element software AQWA has been used to analyze vessel response due to hydrodynamic wave loads,acting on a specific maintenance ship under actual sea *** roll may occur during certain sea conditions,especially in the beam sea,posing a risk to the crew transfer *** Bohai Sea is the area of diverse industrial activities such as offshore oil production,wave and wind power generation,*** paper advocates a novel method for estimating extreme roll statistics,based on Monte Carlo simulations(or measurements).The ACER(averaged conditional exceedance rate)method and its modification are presented in brief detail in *** proposed methodology provides an accurate extreme value prediction,utilizing available data *** this study the estimated return level values,obtained by ACER method,are compared with the corresponding return level values obtained by gumbel *** on the overall performance of the proposed method,it is concluded that the ACER method can provide more robust and accurate prediction of the extreme vessel *** described approach may be well used at the vessel design stage,while defining optimal boat parameters would minimize potential roll.

关键词： wind farm support vessel(WFSV) docking Monte Carlo extreme roll gumbel distribution offshore wind turbine wind energy Bohai Sea

Sampling from a Mixture of Different Groups of Coupons

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Acta Mathematica Sinica,English Series 2020年第12期36卷 1357-1383页

作者： Aristides V.DOUMAS Vassilis G.PAPANICOLAOU Department of Mathematics National Technical University of AthensZografou Campus15780AthensGreece

A collector samples coupons with replacement from a pool containing g uniform groups of coupons,where"uniform group"means that all coupons in the group are equally likely to occur(while coupons of different groups have different probabilities to occur).For each j=1,...,g,let Tj be the number of trials needed to detect Group j,namely to collect all Mj coupons belonging to it at least *** first derive formulas for the probabilities P{T1distribution of T(appropriately normalized)as the number of coupons becomes large.

关键词： Coupon collector problems urn problems asymptotics limiting distribution gumbel distribution

distribution Characteristics of the Intensity and Extreme Intensity of Tropical Cyclones Influencing China

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Journal of Meteorological Research 2014年第3期28卷 393-406页

作者：郑永光陈炯陶祖钰 National Meteorological Center Department of Atmospheric and Oceanic Sciences Peking University

To address the defi ciency of climatological research on tropical cyclones （TCs） infl uencing China, we analyze the distributions of TCs with diff erent intensities in the region, based on the best-track TC data for 1949-2011 provided by the Shanghai Typhoon Institute. We also present the distributions of 50-and 100-yr return-period TCs with diff erent intensities using the gumbel probability distribution. The results show that TCs with diff erent intensities exert distinctive eff ects on various regions of China and its surrounding waters. The extreme intensity distributions of TCs over these diff erent regions also diff er. Super and severe typhoons mainly infl uence Taiwan Island and coastal areas of Fujian and Zhejiang provinces, while typhoons and TCs with lower intensities infl uence South China most frequently. The probable maximum TC intensity （PMTI） with 50- and 100-yr return periods infl uencing Taiwan Island is below 890 hPa; the PMTI with a 50-yr return period infl uencing the coastal areas of Fujian and Zhejiang provinces is less than 910 hPa, and that with a 100-yr return period is less than 900 hPa;the PMTI with a 50-yr return period infl uencing the coastal areas of Hainan, Guangdong, and the northern part of the South China Sea is lower than 930 hPa, and that with a 100-yr return period is less than 920 hPa. The results provide a useful reference for the estimation of extreme TC intensities over diff erent regions of China.

关键词： tropical cyclone intensity extreme gumbel distribution

MULTIVARIATE EXTREME VALUE distribution AND ITS FISHER INFORMATION MATRIX

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Acta Mathematicae Applicatae Sinica 1995年第4期11卷 421-428页

作者：史道济 Department of Mathematics Tianjin University Tianjin China

The paper is concerned with the basic properties of multivariate extreme value distribution (in the Logistic model). We obtain the characteristic function and recurrence formula of the density function. The explicit algebraic formula for Fisher information matrix is indicated. A simple and accurate procedure for generating random vector from multivariate extreme value distribution is presented.

关键词： Characteristic function Fisher information matrix gumbel distribution multivariate extreme value distribution