检索结果-南通市图书馆

Dynamic Behaviors of a Moored floating structure with Flexible Skirts

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2016年第1期10卷 13-22页

作者： Wen-Kai Weng Duc-Tru Tran Ruey-Syan Shih Research Center for Ocean Energy and Strategies National Taiwan Ocean University Keelung 202 Taiwan R.O.C. Ph.D. Program in Department of Harbor and River Engineering National Taiwan Ocean University Keelung 202 Taiwan R.O.C. Department of Construction and Spatial Design. Tungnan University New Taipei City 222 Taiwan R.O.C

A numerical model was developed by using the dual boundary element method to investigate the dynamic behavior of a moored floating structure with a pair of vertical and flexible skirts attached at its bottom in the linear wave field. Theoretical conception is based on potential theory with linear external forces. The motions of the structure were assumed to be small and linear. The flexible skirts mounted beneath the structure were assumed uniform flexural rigidity and the thickness of the skirts was negligible. Comparison between the present model and Gesraha＇s solution was made to verify the results for a moored floating structure with or without rigid skirts. The influence of the skirt rigidity on the moored floating structure, moored lines and waves is investigated in this study. The results show that, the natural frequencies of structure＇s oscillation, moored force, wave reflection and transmission tend to the region of short-period waves when the flexible rigidity gradually decreases. Positive correlation exists between the aft mooring force and the pitch motion of the floating structure.

关键词： floating structure dual boundary element method response amplitude operators flexible skirts.

floating forest:A novel breakwater-windbreak structure against wind and wave hazards

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2021年第5期15卷 1111-1127页

作者： Chien Ming WANG Mengmeng HAN Junwei LYU Wenhui DUAN Kwanghoe JUNG School of Civil Engineering The University of QueenslandQueensland 4072Australia Department of Civil Engineering Monash UniversityVictoria 3168Australia Hyundai Engineering and Construction Technology Research CentreSeoul 03058Korea

A novel floating breakwater-windbreak structure(floating forest)has been designed for the protection of vulnerable coastal areas from extreme wind and wave loadings during storm *** modular arch-shaped concrete structure is positioned perpendicularly to the direction of the prevailing wave and *** structure below the water surface acts as a porous breakwater with wave scattering *** array of tubular columns on the sloping deck of the breakwater act as an artificial forest-type windbreak.A feasibility study involving hydrodynamic and aerodynamic analyses has been performed,focusing on its capability in reducing wave heights and wind speeds in the lee *** study shows that the proposed 1 km long floating forest is able to shelter a lee area that stretches up to 600 m,with 40%–60%wave energy reduction and 10%–80%peak wind speed reduction.

关键词： floating structure breakwater windbreak hydrodynamic CFD

Analysis of Responses of floating Dual Pontoon structure

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2007年第1期21卷 91-104页

作者：翁文凯周宗仁 Department of Harbor and River Engineering National Taiwan Ocean University

A numerical model is developed by use of the boundary integral equation method to investigate the responses of a two-dimensional floating structure. The structure under consideration consisting of two pontoons, is connected by a rigid framework, and linked to the sea floor by a mooring system. The theoretical conception is based on potential theory with hnear external forces, and applied to an arbitrarily shaped body and water depth. The discussion includes the influence of draft and space between pontoons on the responses of the floating structure. Finally, the validity of the method is adequately verified by experimental results.

关键词： boundary element method floating structure dual pontoon

Transportation of floating structures by Using Newly Built Heavy Lifting Semi Vessel HYSY278

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2013年第3期27卷 299-312页

作者：孙伟英张大刚樊之夏 China Oil Offshore Engineering Company DMAR Engineering Inc.

Transportation of floating structures for long distance has always been associated with the use of heavy semi transport vessel. The requirements of this type of vessel are always special, and its availability is limited. To prepare for the future development of the South China Sea deepwater projects, COOEC has recently built a heavy lift transport vessel - Hai Yang Shi You 278 （HYSY278）. This semi-submersible vessel has displacement capacity of 50k DWT, and a breath of 42 m. Understanding the vessel＇s applicability and preparing its use for future deepwater projects are becoming imminent need. This paper reviews the critical issues associated with the floating structure transportation and performs detailed analysis of two designed floating structures during transportation. The newly built COOEC transportation vessel HYSY278 will be used to dry transport the floating structures from COOEC fabrication yard in Qingdao to the oil field in the South China Sea. The entire process will start with load-out/float-offthe floating structures from the construction sites, offload the platform from the vessel if needed, dry transport floating structures through a long distance, and finally offload the platform. Both hydrodynamic and struc^tral analyses are performed to evaluate transport vessel and floating structures. Critical issues associated with the transportation and offloading of platform from the vessel will be studied in detail. Detailed study is performed to evaluate the response of the system during this phase and additional work needed to make the vessel feasible for use of this purpose. The results demonstrate that with proper modifications, HYSY278 can effectively be used for transporting structures with proper arrangement and well-prepared operation. The procedure and details are presented on the basis of study results. Special attentions associated with future use will also be discussed based on the results from analysis.

关键词： dry transport HYSY2 78 floating structure heavy semi-submersible transport vessel TLP Spar productionsemi-submersible

Computation of Design Load and Motion for floating structures Navigating in Waves

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 1999年第1期14卷 93-100页

作者： Wang, YY Zhu, RC Miao, J Dalian Univ Technol Sch Naval Architecture & Marine Engn Dalian 116024 Peoples R China

Analytical and numerical investigation is made of the source potential for-floating structure with forward speed in waves. A particular form is selected for numerical applications, where the double integral of the Green function is transformed into the single one and the oscillation characteristics for integrands in the specific computation domain are treated numerically. A comparison of calculated examples with published data is given and it shows that the numerical simulation is satisfactory and the accuracy is adequate to engineering application.

关键词： floating structure Green function ship motion source distribution

Probabilistic Methods for Reliability Assessment of floating structures Based on Extreme Wave Simulation

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2022年第2期21卷 291-305页

作者： ZHAO Yuliang CHU Xinjie DONG Sheng College of Engineering Ocean University of ChinaQingdao 266100China Drilling Technology Research Institute of Shengli Petroleum Engineering Corporation Limited SINOPECDongying 257017China

With the increasing application of floating platforms in deep waters and harsh environments,a proper assessment of the reliability of floating structures is important to ensure that these structures can operate safely during their design *** study outlines a practical methodology for reliability analysis of a semi-submersible platform based estimating the probability distribution of the extreme response in rough sea conditions(survival conditions).The Constrained NewWave(CNW)theory combined with Monte Carlo simulations was first applied to simulate the random wave surface elevation process in the time domain.A Gumbel distribution was the best fitting to describe the dynamically sensitive extreme response statistics under extreme waves(drift and mooring tension).The derived probability distribution of the extreme response was subsequently used in estimation of the associated limit state func-tion,and a reliability analysis of the floating structure was conducted using the Monte Carlo method.A semi-submersible platform in a water depth of 1500 m subjected to extreme wave loads was used to demonstrate the efficiency of the proposed *** probability of failure of the semi-submersible when considering mooring lines tension is greater than considering drift.

关键词： reliability assessment floating structure Constrained NewWave theory Monte Carlo simulation extreme response

An introduction to hull design practices for deepwater floating structures

在线全文

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2009年第2期8卷 123-131页

作者：张大刚邓忠超闫发锁哈尔滨工程大学深海工程技术研究中心黑龙江哈尔滨150001 WorleyParsons Intecsea 德克萨斯休斯敦77094

The concepts of floating structure plays a very important role in deepwater projects; and the design of the floating structure is one of the most important tasks in the project. The importance of the floating structure in offshore projects can be demonstrated in the following several areas： the substantial dynamic structure responses due to wave loading and current loading; the limited motion requirements of risers in deep water; and the increasing difficulty of installation for different components of the system. Three major technical aspects have to be considered, i.e. the strength of structure, the fatigue resistance capacity of the system, and local and global stability of the structure. This paper reviews the current design practice of floating structures, evaluates the main tasks during the design and associated major technical requirements, and addresses the major technical challenges encountered during the design. As a close-out of the paper, the authors discuss some potential future developments in the design of floating structures.

关键词： floating structure floating system structural design design practice deepwater engineering

New technology opens the door for deepwater development

在线全文

学校读者我要写书评

暂无评论

Engineering Sciences 2011年第1期9卷 7-12,75页

作者： Zhang Dagang Deepwater Engineering ＆ Technology Research Center Harbin Engineering University Harbin 150000 China

The paper provided an updated status of technology for deepwater field development, demonstrated the importance of its application through actual project example, and discussed some future technical development trends. The focus was on the floating structures. By reviewing some of the engineering aspects of the project, the technology advancement, innovations and challenges in offshore engineering were discussed and demonstrated. The author’s view of technical challenges facing deepwater forwarding was discussed, which covered water depth limitations, new material application, installation methods, riser development and operational issues. An overview of technologies that will enable deepwater projects to be extended into new frontiers was presented.

关键词： deepwater exploration field development frontier technology floating structure tender assisted drilling

Application of a Newly Built Semi-submersible Vessel for Transportation of a Tension Leg Platform

在线全文

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2012年第3期11卷 341-350页

作者： Dagang Zhang WeiyingSun Zhixia Fan DMAR Engineering Inc. 15915 Katy Freeway Houston TX 77094 USA China Offshore Oil Engineering Corporation Tianjin 300452 China

Transportation of tension leg platform （TLP） structures for a long distance has always been associated with the use of a heavy semi-transport vessel. The requirements of this type of vessel are always special, and their availability is limited. To prepare for the future development of South China Sea deepwater projects, the China Offshore Oil Engineering Corporation has recently built a heavy lift transport vessel-Hai Yang Shi You 278. This semi-submersible vessel has a displacement capacity of 50k DWT, and a breath of 42 meters. Understanding the vessel＇s applicability and preparing it for use in future deepwater projects are becoming imminent needs. This paper reviews the current critical issues associated with TLP transportation and performs detailed analysis of the designed TLP during load-out and transportation. The newly built COOEC transportation vessel HYSY 278 was applied to dry transport of the TLP structure from the COOEC fabrication yard in Qingdao to an oil field in South China Sea. The entire process included the load-out of the TLP structure from the landsite of the fabrication yard, the offloading and float-on of the platform from the vessel, the dry transport of the TLP over a long distance, and the final offloading of the platform. Both hydrodynamic and structure analysis were performed to evaluate the behavior of the transport vessel and TLP structure. Special attention was paid to critical areas associated with the use of this new vessel, along with any potential limitations. The results demonstrate that HYSY 278 can effectively be used for transporting the structure with proper arrangement and well-prepared operation. The procedure and details were presented on the basis of the study results. Special attention was also given to discussion on future use based on the results from the analysis.

关键词： dry transport HYSY 278 tension leg platform (TLP) structure heavy semi-submersible transportvessel floating structure