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- 저자 : Tuanjie Li (검색결과 2 건)
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Da Li,Ikjae Lee,Cong Yi,Wei Gao,Chunhui Song,Shenglei Fu,Moohyun Kim,Alex Ran,Tuanjie Liu Techno-Press 2023 Ocean systems engineering Vol.13 No.3
The global performance of a 15 MW floating offshore wind turbine, a newly designed semisubmersible floating foundation with multiple heave plates by CNOOC, is investigated with two independent turbine-floater-mooring coupled dynamic analysis programs CHARM3D-FAST and OrcaFlex. The semisubmersible platform hosts IEA 15 MW reference wind turbine modulated for VolturnUS-S and hybrid type (chain-wire-chain with clumps) 3×2 mooring lines targeting the water depth of 100 m. The numerical free-decay simulation results are compared with physical experiments with 1:64 scaled model in 3D wave basin, from which appropriate drag coefficients for heave plates were estimated. The tuned numerical simulation tools were then used for the feasibility and global performance analysis of the FOWT considering the 50-yr-storm condition and maximum operational condition. The effect of tower flexibility was investigated by comparing tower-base fore-aft bending moment and nacelle translational accelerations. It is found that the tower-base bending moment and nacelle accelerations can be appreciably increased due to the tower flexibility.
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Pretension design of a flexible support cable net structure with high node position precision
Hangjia Dong,Tuanjie Li,Cong-Cong Chen 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.6
A prestressed cable net structure is applied to shape and support the reflective surface of mesh antennas. The radiation pattern of an antenna highly depends on the positions of the cable net nodes. The pretension force and node positions of the cable net structure are strongly coupled. The deformation of the flexible support frame changes the positions of the cable net nodes, causing the radiation pattern to deteriorate. To achieve high node position precision, this study proposes the pretension design method of a cable net structure with flexible supports. To improve calculation efficiency, finite element method and force density method are combined to calculate structural deformation directly and accurately. Furthermore, a pretension optimization model is established by considering the rigid body displacements of the nodes. This model is solved iteratively. Numerical results show that the proposed pretension design method can achieve high design accuracy for a flexible support cable net structure and significantly improve the mechanical properties of a support frame.
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