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Influence of Regular Wave and Ship Characteristics on mooring force Prediction by Data-Driven Model

China Ocean Engineering 2020年第4期34卷 589-596页

作者： LIU Bi-jin CHEN Xiao-yun ZHANG You-quan XIE Jing CHANG Jiang School of Civil Engineering and Architecture Xiamen University of TechnologyXiamen 361024China Fujian Marine Forecasts Fuzhou 350003China Tianjin Research Institute for Water Transport Engineering Tianjin 300456China Tianjin Survey and Design Institute for Water Transport Engineering Tianjin Key Laboratory of Surveying and Mapping for Waterway Transport EngineeringTianjin 300456China

The study of mooring forces is an important issue in marine engineering and offshore structures.Although being widely applied in mooring system,numerical simulations suffer from difficulties in their multivariate and nonlinear modeling.Data-driven model is employed in this paper to predict the mooring forces in different lines,which is a new attempt to study the mooring forces.The height and period of regular wave,length of berth,ship load,draft and rolling period are considered as potential influencing factors.Input variables are determined using mutual information(MI)and principal component analysis(PCA),and imported to an artificial neural network(NN)model for prediction.With study case of 200 and 300 thousand tons ships experimental data obtained in Dalian University of Technology,MI is found to be more appropriate to provide effective input variables than PCA.Although the three factors regarding ship characteristics are highly correlated,it is recommended to input all of them to the NN model.The accuracy of predicting aft spring line force attains as high as 91.2%.The present paper demonstrates the feasibility of MI-NN model in mapping the mooring forces and their influencing factors.

关键词： mooring force characteristics of ship neural network mutual information principal component analysis

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Experimental Study of mooring Type Effect on the Hydrodynamic Characteristics of VLFS

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China Ocean Engineering 2022年第1期36卷 155-166页

作者： FENG Ming-wei SUN Zhao-chen LIANG Shu-xiu LI Zhi LV Xuan JIA Song-lin HUXin-yue State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

mooring system is a significant part of very large offshore floating structures(VLFS).In this paper,a single module pontoon type VLFS model considering four mooring types is studied through physical model tests to determine the effects of mooring conditions on the hydroelastic response,mooring force,incident coefficient,reflection coefficient and energy dissipation coefficient.Eight mooring cables are symmetrically arranged on both sides of the model.The floating body model satisfies the similarity of stiffness and gravity,while the cable satisfies the similarity of elasticity and gravity.The results show that the effect of mooring type on mooring force is greater than that on hydroelastic response.Increasing the initial tension of the mooring cable will reduce the amplitude of the leeward of the VLFS model.The mooring angle of the mooring cable will affect the maximum mooring force and the initial tension of the mooring line will affect the wave period in which the maximum mooring force occurs.The transmission coefficient and wave energy dissipation coefficient will change regularly with different mooring types.These results may provide a reference to facilitate the mooring design of VLFS.

关键词： VLFS hydroelastic response mooring system 3D experimental test mooring force wave reflection coefficient wave transmission coefficient wave dissipation coefficient

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Experimental Research on A New Type of Floating Breakwater for Wave-Absorbing and Energy-Capturing

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China Ocean Engineering 2020年第6期34卷 817-827页

作者： HUANG Fang-ping GONG Kai LIU Zuo-shi CHEN Jun-hua HUANG Yan-chen School of Mechanical Engineering Zhejiang UniversityHangzhou 310027China Ningbo Institute of Technology Zhejiang UniversityNingbo 315100China School of Mechanical and Electrical Engineering Jiangxi University of Science and TechnologyGanzhouChina

To avoid the damage caused by big wind and wave in cage culture, and to solve the problem of energy supply faced by automatic breeding equipment, a new type of floating breakwater, named as Savonius double buoy breakwater(SDBB), is proposed in the paper. The floating breakwater is composed of HDPE cylindrical double buoys and horizontal axis Savonius rotors, and has the functions of wave-absorbing and energy-capturing. Based on the linear wave theory and energy conservation law, the Fourier Transform was applied to separate the two-dimensional wave frequency domain, and the energy captured by the rotors and absorbed by the floating breakwater were calculated.Experiments were conducted in a two-dimensional wave-making flume, and the transmitted waves at different wave heights and periods, the tension of mooring lines, and the rotational torque exerted on the Savonius rotor were measured. A series of performance comparison tests were also performed on the new floating breakwater and the traditional double-floating breakwater. Results show that the new floating breakwater is better than the traditional one in terms of reducing wave transmittance, and the combination of the floating breakwater with Savonius rotors can provide for marine aquaculture equipments with green power supply to a certain degree of self-sufficiency.

关键词： floating breakwater Savonius rotor transmission coefficient wave energy capturing mooring force

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Study on mooring Design and Calculation Method of Ocean Farm Based on Time-Domain Potential Flow Theory

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Journal of Marine Science 2020年第3期2卷 1-10页

作者： Baoji Zhang Yuhang Sun College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai201306China Merchant Marine College Shanghai Maritime UniversityShanghai201306China

In order to calculate the mooring force of a new semi-submerged Ocean Farm quickly and accurately,based on the unsteady time-domain potential flow theory and combined the catenary model,the control equation of mooring cable is established,and the mooring force of the platform under the wave spectrum is calculated.First of all,based on the actual situation of the ocean environment and platform,the mooring design of the platform is carried out,and the failure analysis and sensitivity analysis of the single anchor chain by the time domain coupling method are adopted:including different water depth,cycle,pretension size,anchor chain layout direction and wind speed,etc.The analysis results confirm the reliability of anchoring method.Based on this,the mooring point location of the platform is determined,the force of each anchor chain in the anchoring process is calculated,and the mooring force and the number of mooring cables are obtained for each cable that satisfies the specification,the results of this paper can provide theoretical calculation methods for mooring setting and mooring force calculation of similar offshore platforms.

关键词： Ocean farm Wave load mooring force Potential flow theory

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