DYNAMIC RESPONSE AND SPATIAL-TEMPORAL EVOLUTIONS OF DEEP-WATER COMPLEX CONFIGURATION CABLES WITH DISTRIBUTED BUOYANCY MODULES

Guo Shuangxi; Chen Weimin; Yan Dingbang; Song Jixiang; Shen Yijun

doi:10.6052/0459-1879-22-238

Volume 54 Issue 8

Aug. 2022

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Chinese Journal of Theoretical and Applied Mechanics > 2022 > 54(8): 2210-2223. > DOI: 10.6052/0459-1879-22-238 CSTR: 32045.14.0459-1879-22-238

Guo Shuangxi, Chen Weimin, Yan Dingbang, Song Jixiang, Shen Yijun. Dynamic response and spatial-temporal evolutions of deep-water complex configuration cables with distributed buoyancy modules. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(8): 2210-2223. DOI: 10.6052/0459-1879-22-238

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DYNAMIC RESPONSE AND SPATIAL-TEMPORAL EVOLUTIONS OF DEEP-WATER COMPLEX CONFIGURATION CABLES WITH DISTRIBUTED BUOYANCY MODULES

Guo Shuangxi^{*, †},
Chen Weimin^{*, †,},
Yan Dingbang^{*, **},
Song Jixiang^{*, ††},
Shen Yijun^***

*.
Key Laboratory for Mechanics in Fluid Solid Coupling System, Institute of Mechanics, CAS, Beijing 100190, China
†.
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
**.
Hunan Applied Technology University, Changde 415100, Hunan, China
††.
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
***.
State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China

Received Date: May 30, 2022
Accepted Date: August 01, 2022
Available Online: August 02, 2022

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Abstract

Abstract

Long flexible cables is one of important parts of complex systems used in explorations and exploitations of ocean resources, particularly in deep or even ultra-deep water. These flexible cables, with large aspect ratio usually at level of 10³, need to be installed with distributed buoyancy modules along its body length. In that case, these distributed buoyancy modules make deep-sea cable configuration more complex and, moreover, their structural properties, such as structural tension and mass, are axially-changing. Thus structural motion response and its spatial-temporal evolutions become more complicated, which brings serious challenges to structural safety. In this study, a novel structural configuration, i.e. the double-stepped cable, is considered, and the dynamic governing equations of deep-water cable with distributed buoyancy modules are developed, principally based on the particular fluid-solid interaction characteristics and its coupling representation of the loadings, along with the experimental observations and verifications using our experimental water tank. The numerical simulations of the double-stepped cable dynamic response are carried out using the modified finite element approach. The responses and its corresponding propagations of the double-stepped cables, in terms of structural displacement and tensions along cable length, under environmental loadings and top-end excitations are comprehensively examined. In addition, the evolutions of displacement amplitudes and wavelengths of this kind of structure with axially-varying tension are explained based on the WKB theory. Our results show that the response does not change monotonously as it propagates along the cable length, and a local peak value may appear in the region with lower tension. Owing to the distributed buoyancy modules, along with axially-varying and discontinuous structural properties, the response spatial-temporal evolutions becomes more variant. There are mixed effects coming from both standing wave and traveling wave. It is also found that structural tensions not only affect the response amplitude significantly, also cause changes of wavelength during the process of response propagation.
- complex configuration,
- fluid-solid coupling,
- dynamic,
- wave propagation,
- no-uniform structure

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