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Title:
On the slack phenomena and snap force in tethers of submerged floating tunnels under wave conditions
Author: Lu W(陆维); Ge F(葛斐); Wang L(王雷); Wu XD(武晓东); Hong YS(洪友士)
Source: Marine Structures
Issued Date: 2011
Volume: 24, Issue:4, Pages:358-376
Abstract: Under severe sea wave conditions, the mooring tethers of submerged floating tunnel (SFT) might go slack. It may cause the structure failure during the service lifetime of SFT. The paper investigated SFT dynamics when going through tether slacking and the related snap force under wave conditions. Besides the nonlinearity of fluid drag and of structural geometry for a relative large structure displacement, the problem is characterized by the nonlinearity due to the discontinuity in axial stiffness of the tethers. To include these nonlinearities, the method of Lagrange energy is used to build the governing equations of SFT motion, and a bilinear oscillator is introduced to simulate the mooring tether operating in an alternating slack-taut state. The sensitivities of the occurrence of tether slacking to wave height and wave period are investigated. Results show that at a large wave height SFT tether will go slack and snap force occurs. SFT responses are categorized into three types of state according to the dynamic response characteristics of tether tension. Effects of two fundamental structure parameters, buoyancy-weight ratio (BWR) and inclined mooring angle (IMA), on the dynamic responses of SFT are analyzed. A slack-taut map of SFT tethers is built. It intuitively describes the occurrences of slack and snap force with different combinations of the two parameters. An analytical approach for slack prediction by deriving the slack criterion is provided to reveal the mechanism of the presented slack-taut map. By present research, the authors tried to make their effort to provide an alternative philosophy for SFT structural design on concerning preventing the occurrence of tether slacking and snap force. (C) 2011 Elsevier Ltd. All rights reserved.
Keyword: Submerged Floating Tunnel ; Tether Slacking ; Snap Force ; Bilinear Oscillator ; Structure Parameter ; Slack Criterion ; Dynamic-Response ; Excitation ; Systems
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Ge, F (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China
Correspondent Email: gefei@imech.ac.cn
DOI: 10.1016/j.marstruc.2011.05.003
Related URLs: 查看原文
DOC Type: Article
WOS Subject: Engineering, Marine ; Engineering, Civil
WOS Subject Extended: Engineering
WOS Keyword Plus: DYNAMIC-RESPONSE ; EXCITATION ; SYSTEMS
WOS ID: WOS:000295768800003
ISSN: 0951-8339
Rank: [Lu, Wei; Ge, Fei; Wang, Lei; Wu, Xiaodong; Hong, Youshi] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Subject: Engineering
Department: LNM金属材料微结构与力学性能
Classification: 一类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/44906
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Lu W,Ge F,Wang L,et al. On the slack phenomena and snap force in tethers of submerged floating tunnels under wave conditions[J]. Marine Structures,2011-01-01,24(4):358-376.
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