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Motion and Dynamic Responses of A Semisubmersible in Freak Waves

China Ocean Engineering 2017年第6期31卷 754-763页

作者： LI Xin DENG Yan-fei LI Lei TIAN Xin-liang LI Jun State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 China CIMC Offshore Co. Ltd. Shenzhen 518000 China

The present research aims at clarifying the effects of freak wave on the motion and dynamic responses of a semisubmersible. To reveal the effects of mooring stiffness, two mooring systems were employed in the model tests and time-domain simulations. The 6-DOF motion responses and mooring tensions have been measured and the 3- DOF motions of fairleads were calculated as well. From the time series, trajectories and statistics information, the interactions between the freak wave and the semisubmersible have been demonstrated and the effects of mooring stiffness have been identified. The shortage of numerical simulations based on 3D potential flow theory is presented. Results show that the freak wave is likely to cause large horizontal motions for soft mooring system and to result in extremely large mooring tensions for tight mooring system. Therefore, the freak wave is a real threat for the marine structure, which needs to be carefully considered at design stage.

关键词： motion response mooring tension semisubmersible freak wave mooring stiffness

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The Effect of Key Design Parameters on the Global Performance of Submerged Floating Tunnel under Target Wave and Earthquake Excitations

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Computer Modeling in Engineering & Sciences 2021年第7期128卷 315-337页

作者： Chungkuk Jin MooHyun Kim Department of Ocean Engineering Texas A&M UniversityCollege StationTX 77843USA

This study presents a practical design strategy for a large-size Submerged Floating Tunnel(SFT)under different target environments through global-performance simulations.A coupled time-domain simulation model for SFT is established to check hydro-elastic behaviors under the design random wave and earthquake *** tunnel and mooring lines are modeled with a finite-element line model based on a series of lumped masses connected by axial,bending,and torsional springs,and thus the dynamic/structural deformability of the entire SFT is fully *** dummy-connection-mass method and constraint boundary conditions are employed to connect the tunnel and mooring lines in a convenient ***-and earthquake-induced hydrodynamic forces are evaluated by the Morison equation at instantaneous node *** wave and earthquake conditions are selected to evaluate its global performance and sensitivity at different system *** BuoyancyWeight Ratios(BWRs),submergence depths,and tunnel lengths(and mooring intervals)are chosen to establish a design strategy for reducing the maximum mooring *** static and dynamic tensions are critical to find an acceptable design depending on the given target environmental *** plays a crucial role in preventing snap loading,and the corresponding static tension is a primary factor if the environmental condition is *** tunnel length can significantly be extended by reducing BWR when environmental force is not that *** tension becomes important in harsh environmental conditions,for which high BWR and short mooring interval are *** is underscored that the wet natural frequencies with mooring are located away from the spectral peaks of design waves or earthquakes.

关键词： Submerged floating tunnel BWR submergence depth tunnel length mooring interval wave earthquake mooring tension snap loading

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Comparison Study and Forensic Analysis between Experiment and Coupled Dynamics Simulation for Submerged Floating Tunnel Segment with Free Ends under Wave Excitations

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Computer Modeling in Engineering & Sciences 2023年第10期137卷 155-174页

作者： Woo Chul Chung Chungkuk Jin Moo Hyun Kim Ju-young Hwang Division of Mechanical Engineering Korea Maritime&Ocean UniversityBusanSouth Korea Department of Ocean Engineering and Marine Sciences Florida Institute of TechnologyMelbourneFLUSA Department of Ocean Engineering Texas A&M UniversityCollege StationTXUSA Department of Civil Engineering Dong-Eui UniversityBusanSouth Korea

This paper presents dynamic-behavior comparisons and related forensic analyses of a submerged floating tunnel(SFT)between numerical simulation and physical experiment under regular and irregular *** experiments are conducted in the 3Dwave tank with 1:33.3 scale,and the corresponding coupled time-domain simulation tool is devised for *** entire SFT systemconsists of a long concrete tunnel and 12 tubular aluminummooring *** numerical simulation models,the Cummins equation with 3D potential theory including second-order wave-body interaction effects and the much simpler Morison-equation-based formula with the lumped-massbased line model,are designed and *** analyses for mooring-line adjustments in the simulation are carried out in view of the best representation of the physical *** that,the measured pre-tension distribution and systemstiffness of twelvemooring lines arewell reproduced in the ***,the dynamic responses and mooring tensions of the SFT are compared under regular and irregular *** measured and simulated results coincide reasonably well for both regular-and irregular-wave conditions.

关键词： Submerged floating tunnel comparative study forensic analysis mooring-line modeling dynamic response mooring tension

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An Experimental Investigation on the Motion and Dynamic Responses of A Semisubmersible in Freak Waves

An Experimental Investigation on the Motion and Dynamic Resp...

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第十七届中国海洋（岸）工程学术讨论会

作者： DENG Yanfei YANG Jianmin XIAO Longfei TIAN Xinliang LI Jun State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University

The present research aims at experimentally clarifying the effects of freak wave on the motion and dynamic responses of a semisubmersible. To reveal the effects of mooring stiffness, two mooring systems were employed in the formal tests. The 6-dof motion responses and mooring tensions have been measured and the 3-dof motions of fairleads were calculated as well. From the time series, trajectories and statistics information, the interactions between the freak wave and the reference semisubmersible have been demonstrated and the effects of mooring stiffness have been identified. Experimental results show that the freak wave is likely to cause large horizontal motions for soft mooring system and to result in extremely large mooring tensions for tight mooring system. Therefore, the freak wave is a real threat for the marine structure, which needs to be carefully considered at design stage.

关键词： motion response mooring tension semisubmersible freak wave mooring stiffness

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