Experimental exploration of unpowered propellers for vortex-induced vibration suppression of flexible riser

Li, Fuheng; Guo, Haiyan; Wen, Shi Wu; Gu, Honglu; Liu, Runbo; Zhao, Chengjie; Li, Xiaomin

doi:10.1016/j.oceaneng.2022.112968

Cited by 6 publications

(1 citation statement)

References 44 publications

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“…As for the direction of incoming flow, Liu et al [9] concluded through experiments that, under the condition of uniform flow velocity, the vibration frequency of the riser in the flow direction is basically twice that in the cross-flow direction; therefore, the dynamic vibration of the riser in both directions should be considered simultaneously. Li et al [10] studied the influence of boundary conditions on the vibration amplitude and found that under the same circumstances, the vibration amplitude of the riser with simple supports was much greater than that with fixed supports. Similarly, Gao et al [11] found through numerical analysis that within a certain range, a smaller slenderness ratio (L/D) led to a more obvious impact on the vibration amplitude due to the different boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

The Experimental Study of Dynamic Response of Marine Riser under Coupling Effect of Multiparameter

Zheng,

Wang,

et al. 2023

JMSE

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In order to investigate the dynamic response of a marine riser under the coupling effect of multiparameter, a model experiment of a marine riser was designed and carried out. The main parameters of the model test were divided into riser design parameters and flow field parameters. The riser parameters included the elastic modulus, boundary conditions, and top tension forces, and the flow field parameters were the velocities and wave parameters (wave height and period). The riser materials were aluminum (Al) and polymethyl methacrylate (PMMA), representing the metal riser and fiber-reinforced composite marine riser, respectively, which differ greatly in modulus. Two types of boundary conditions were considered, which were simple supports at both ends (S-S) and simple and fixed supports at each end (S-F). The top tension forces were chosen as 10 N and 30 N, respectively. In terms of the flow velocities, 0.3 m/s and 0.7 m/s were used. For the wave types, the small wave had a period of 1.0 s and a wave height of 5 cm while the large wave had a period of 2.0 s and a wave height of 15 cm. The dynamic response of the riser under 32 different working conditions was studied experimentally, and through the analysis of the experimental data, the effects of various parameters on the dynamic response of the risers were obtained. The results show that the amplitude of the riser was negatively correlated with the elastic modulus, the number of constraints, and the magnitude of the top tension, while it was positively correlated with the flow velocity and wave size. Moreover, the sequences of importance were b3 (flow velocity) > b6 (modulus) > b1 (number of constraints) > b2 (top tension force) > b5 (wave height) > b4 (wave period) for the vibration of the riser in the in-flow direction and b3 (flow velocity) > b1 (number of constraints) > b6 (modulus) > b2 (top tension force) > b5 (wave height) > b4 (wave period) for the vibration of the riser in the cross-flow direction, respectively, according to the multiple linear regression calculation.

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Section: Introductionmentioning

confidence: 99%