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Parametric Excitation of Mooring Cables for Submerged Floating Tunnels

 Parametric Excitation of Mooring Cables for Submerged Floating Tunnels
Autor(en): , ,
Beitrag für IABSE Conference: Bridges and Structures Sustainability - Seeking Intelligent Solutions, Guangzhou, China, 8-11 May 2016, veröffentlicht in , S. 946-952
DOI: 10.2749/222137816819259356
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The ferry links crossing the fjords along the west coast of Norway are going to be replaced by fixed links. Among the proposed solutions is the construction of Submerged Floating Tunnels (SFT). A m...
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Autor(en):


Medium: Tagungsbeitrag
Sprache(n): Englisch
Tagung: IABSE Conference: Bridges and Structures Sustainability - Seeking Intelligent Solutions, Guangzhou, China, 8-11 May 2016
Veröffentlicht in:
Seite(n): 946-952 Anzahl der Seiten (im PDF): 7
Seite(n): 946-952
Anzahl der Seiten (im PDF): 7
Jahr: 2016
DOI: 10.2749/222137816819259356
Abstrakt:

The ferry links crossing the fjords along the west coast of Norway are going to be replaced by fixed links. Among the proposed solutions is the construction of Submerged Floating Tunnels (SFT). A mooring system should be used to restrain the movements of these floating structures. Long period waves, such as swell waves, parametrically excite the system and might result in excessive vibrations in the cable. This paper presents the equations of motion of the mooring line and derives an analytical expression, which allows for a quick identification of the system’s stability. This expression is obtained through the Harmonic Balance Method (HBM) with two harmonic terms. The contribution of multiple modes of vibration is investigated for the case of small sag to span ratios. The expression is compared with the results from a numerical model, revealing the applicability of the proposed formulation.

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