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Dynamic Response Analysis of a Floater Segment in an HDPE Double-Pontoon Nearshore Fishing Net Cage
Huafeng Shan, Jinmao Feng, Zhijie Jiang, Yuejie Tao, Tangdai Xia and Yanzhen Wang

Seawater-floater interaction significantly impacts floater dynamic response. Taking the floater segment in a high-density polyethylene (HDPE) double-pontoon nearshore fishing net cage as the research object, a two-way cross-coupling algorithm was employed to simulate the fluid-structure interaction (FSI) effects between seawater and the floater. Considering the double-pontoon structural form of the net cage floater and its mooring system, a three-dimensional refined finite element model of the floater segment was established. Various sea conditions that the net cage might encounter in its operational area were investigated, and a numerical wave tank was designed to simulate the dynamic response of the floater segment in the HDPE double-pontoon nearshore fishing net cage. The numerical simulation results show that under wave-current loading, the floater segment undergoes rigid translation, rotation, and torsional deformation, with the torsional deformation synchronizing with the rotation trend. The intersection between the floater segment and connectors is a weak part in the floater structure design. Compared with calculation results that only consider wave-current effects, the FSI effects between seawater and the floater segment induces high-frequency motion of the floater segment, with significant amplitude and resulting structural internal forces. Floater in inner seas or bays can withstand extreme wave-current actions caused by a once-in-ten-year typhoon.

Keywords: Structural dynamic response, HDPE, double-pontoon nearshore fishing net cage, two-way cross-coupling algorithm, fluid-structure interaction.