2026-10-07T01:42:37Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33780859 2026-09-15T09:08:36Z category_62 portal_316 item_type_3 month_year_09_2026

Table 1_RAO-driven dynamic assessment of a subsea-manifold installation at 1526 m water depth.docx Zhifeng Wang (532697) Ning Cui (502137) Xingchao Wei (24919684) Haiyang Liu (445454) Siyu Lu (1412086) Bo Wang (86769) Xiaoguang Tan (24919687) Lizhi Duan (7999007) Yan Qu (682614) Marine Biology dynamic amplification final-approach control heave compensation RAO-driven coupling rope torsion splash-zone slamming subsea manifold ultra-deepwater installation <p>Installing a large asymmetric subsea structure in ultra-deep water requires coordinated control of vessel motion, long-wire compliance, splash-zone hydrodynamics, crane and rigging capacity, resonance, and final-approach velocity. This study develops an RAO-driven one-way coupled time-domain assessment of the Normand Oceanic crane-wire-rigging-Manifold E3 system in OrcaFlex. Vessel and crane-tip motions are prescribed from displacement response-amplitude operators, while the nonlinear hoisting lines, rigging, and six-degree-of-freedom payload respond dynamically without feedback to the vessel solution. The analysis covers six installation stages from half-submerged entry to a controlled approach 10 m above the seabed at 1526 m water depth. Stage-specific calculations quantify crane-tip, hook, and sling forces, dynamic amplification, natural-period migration, and approach velocity for spectral peak periods of 4–11 s and three project headings. The hydrodynamic formulation distinguishes the 43.51 t displaced-water reference mass from the 1874.90 t vertical added mass used in the dynamic model. At a 165° wave heading, the most restrictive condition occurs during the final approach when active heave compensation is off: the allowable significant wave height decreases to 0.6 m at a peak period of 11 s, whereas all investigated AHC-on cases satisfy the acceptance criteria at H_s = 3.0 m. The resulting stage-resolved workflow links hydrodynamic loading, hoisting-system dynamics, equipment capacity, clearance, and final-approach control in a traceable operational framework that supported engineering planning for the field installation.</p> 2026-09-15T09:08:36Z Dataset Dataset 10.3389/fmars.2026.1951772.s001 https://figshare.com/articles/dataset/Table_1_RAO-driven_dynamic_assessment_of_a_subsea-manifold_installation_at_1526_m_water_depth_docx/33780859 CC BY 4.0