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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

Numerical optimisation of a classical stochastic system for targeted energy transfer

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Theoretical & Applied Mechanics Letters 2023年第3期13卷 170-176页

作者： oleg gaidai Yubin Gu Yihan Xing Junlei Wang Daniil Yurchenko Shanghai Engineering Research Center of Marine Renewable Energy Shanghai Ocean UniversityChina School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyChina Department of Machine Building and Materials TechnologyUniversity of StavangerNorway School of Mechanical and Power Engineering Zhengzhou UniversityChina Institute for Sound and Vibration Research University of SouthamptonUK

The paper studies stochastic dynamics of a two-degree-of-freedom system,where a primary linear system is connected to a nonlinear energy sink with cubic stiffness nonlinearity and viscous *** the primary mass is subjected to a zero-mean Gaussian white noise excitation,the main objective of this study is to maximise the efficiency of the targeted energy transfer in the system.A surrogate optimisation algorithm is proposed for this purpose and adopted for the stochastic *** optimisations are conducted separately for the nonlinear stiffness coefficient alone as well as for both the nonlinear stiffness and damping coefficients *** different optimisation cost functions,based on either energy of the system’s components or the dissipated energy,are *** results demonstrate some clear trends in values of the nonlinear energy sink coefficients and show the effect of different cost functions on the optimal values of the nonlinear system’s coefficients.

关键词： Targeted energy transfer Surrogate optimisation Stochastic system Random vibration

Prediction of death rates for cardiovascular diseases and cancers

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Cancer Innovation 2023年第2期2卷 140-147页

作者： oleg gaidai Yihan Xing Rajiv Balakrishna Jiayao Sun Xiaolong Bai Shanghai Engineering Research Center of Marine Renewable Energy College of Engineering Science and TechnologyShanghai Ocean UniversityShanghaiChina Department of Mechanical and Structural Engineering and Materials Science University of StavangerStavangerNorway School of Naval Architecture&Ocean Engineering Jiangsu University of Science and TechnologyZhenjiangChina

Background:To estimate cardiovascular and cancer death rates by regions and time ***:Novel statistical methods were used to analyze clinical surveillance ***:A multicenter,population-based medical survey was *** recorded deaths from cardiovascular diseases were analyzed for all 195 countries of the *** is challenging to model such data;few mathematical models can be applied because cardiovascular disease and cancer data are generally not normally ***:A novel approach to assessing the biosystem reliability is introduced and has been found to be particularly suitable for analyzing multiregion environmental and healthcare *** traditional methods for analyzing temporal observations of multiregion processes do not deal with dimensionality efficiently,our methodology has been shown to be able to cope with this ***:Our novel methodology can be applied to public health and clinical survey data.

关键词： cardiovascular disease cancer probability forecast public health mathematical biology

Wake Effects on A Hybrid Semi-Submersible Floating Wind Farm with Multiple Hub Heights

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China Ocean Engineering 2023年第1期37卷 101-114页

作者： XU Xiao-sen GU Jia-yang LING Hong-jie YANG Pu-yi WANG Shuai-shuai XING Yi-han oleg gaidai ZHANG Zhong-yu Marine Equipment and Technology Institute Jiangsu University of Science and TechnologyZhenjiang 212100China Department of Mechanical and Civil Engineering Florida Institute of TechnologyMelbourne 32901United States Department of Marine Technology Norwegian University of Science and TechnologyTrondheim 7491Norway Department of Mechanical and Structural Engineering and Materials Science University of StavangerStavanger 4021Norway College of Engineering Science and Technology Shanghai Ocean EngineeringShanghai 201306China

Wind farms generally consist of a single turbine installed with the same hub height. As the scale of turbines increases,wake interference between turbines becomes increasingly significant, especially for floating wind turbines(FWT).Some researchers find that wind farms with multiple hub heights could increase the annual energy production(AEP),while previous studies also indicate that wake meandering could increase fatigue loading. This study investigates the wake interaction within a hybrid floating wind farm with multiple hub heights. In this study, *** is employed to simulate a hybrid wind farm which consists of four semi-submersible FWTs(5MW and 15MW) with two different hub heights. Three typical wind speeds(below-rated, rated, and over-rated) are considered in this paper to investigate the wake meandering effects on the dynamics of two FWTs. Damage equivalent loads(DEL) of the turbine critical components are computed and analyzed for several arrangements determined by the different spacing of the four turbines. The result shows that the dynamic wake meandering significantly affects downstream turbines’ global loadings and load effects. Differences in DEL show that blade-root flapwise bending moments and mooring fairlead tensions are sensitive to the spacing of the turbines.

关键词： hybrid floating wind farm wake meandering multiple hub heights floating wind turbine FAST.Farm fatigue

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极地航行油船舱内液体制荡方法

船舶工程 2021年第7期43卷 25-28,159页

作者：张健桂镔 oleg gaidai 李兰岚江苏科技大学船舶与海洋工程学院江苏镇江212003

航行于碎冰区的液货船舱室内的液体会因碎冰载荷的作用而产生晃动,从而对船舶的稳性产生负面影响。对此,通过元胞机技术建立碎冰域,采用商业有限元软件PATRAN建立船体模型,利用LS-DYNA模拟液货船的冰区航行过程,获得碎冰载荷对舱室液体... 详细信息

航行于碎冰区的液货船舱室内的液体会因碎冰载荷的作用而产生晃动,从而对船舶的稳性产生负面影响。对此,通过元胞机技术建立碎冰域,采用商业有限元软件PATRAN建立船体模型,利用LS-DYNA模拟液货船的冰区航行过程,获得碎冰载荷对舱室液体的影响。通过对不同柔性挡板的减摇能力进行对比,利用ANSYSFluent软件得出最佳的减少晃动的方式。计算方法和所得结果可供冰区航行的油船舱室设计参考。

关键词：元胞机碎冰模型舱室晃荡柔性挡板

冲击载荷作用下船用软芯功能梯度夹层板动态响应分析

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船舶力学 2022年第6期26卷 933-947页

作者：叶仁传张志浩敖力君赵娜杨文龙崔杰江苏科技大学船舶与海洋工程学院江苏镇江212003 江苏科技大学理学院江苏镇江212003

本文提出一种用于求解软芯功能梯度夹层板的多坐标系多层精细动态模型,采用李维解和龙格-库塔法求解整体控制方程。计算结果表明,该模型能够精确计算冲击载荷作用下软芯功能梯度夹层板的动态响应,同时能够精确捕捉功能梯度软芯材的微小... 详细信息

本文提出一种用于求解软芯功能梯度夹层板的多坐标系多层精细动态模型,采用李维解和龙格-库塔法求解整体控制方程。计算结果表明,该模型能够精确计算冲击载荷作用下软芯功能梯度夹层板的动态响应,同时能够精确捕捉功能梯度软芯材的微小变形。通过与有限元计算结果对比验证所提模型的精度。通过数值计算,分析软芯功能梯度夹层结构的面/芯厚度比、弹性模量幂指数、爆炸载荷对功能梯度软芯夹层板动态响应的影响,可为新型软芯功能梯度结构设计和应用提供理论基础和指导。

关键词：夹层板软质功能梯度芯材多层精细动态模型冲击载荷动态响应