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Vortex-induced vibration (VIV) of a marine riser is a great threat to its service safety. From the perspective of energy, the hydrodynamic force on the riser undergoing vortex-induced vibration was divided into three components, i.e. vortex-induced force acting as energy input, drag force acting as energy dissipation and added mass force acting a neutral role in energy. The energy competition between the first two components determines the final energy effect of the fluid on the structure. Furthermore, the identification method of hydrodynamic coefficients based on the flexible riser model experiment was derived for the new hydrodynamic force model in detail. Through the towing experiment of the flexible riser, the vortex-induced vibration response, and coefficients distribution characteristics under different flow velocities were identified. The results show that the vortex induced vibration response of the flexible riser under uniform flow has multi-mode participation characteristic, which leads to the "jump" phenomenon of hydrodynamic coefficients. The vortex-induced force coefficients and drag coefficients behave significant correlation with the amplitude of VIV. Based on the measured values between hydrodynamic coefficients and response amplitude, an empirical model for hydrodynamic coefficients under energy competition force model was preliminarily established. The research in this paper provides a valuable reference for the development of fast empirical prediction methods of marine risers in the future.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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