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Keywords: vibration
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Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3128
...-structure interaction and investigate the ice-induced loads and vibrations of cylindrical structure. The softening elastoplastic model integrating Drucker-Prager yield criterion is embedded into the SPH method to simulate the failure progress of ice. The cylindrical structure is conducted as the deformable...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3106
..., flexible plate and shell structures exist in large numbers, and the fluidstructure coupling vibration of such structures is a widespread problem. For the research of wind turbine blade, the precise simulation of flexible thin plate under the wind field is the basic research, and the wind turbine blade...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-4136
... Abstract This paper presents an investigation of the reliable performance of the offshore drill strings subjected to separate and combined stick-slip vibration and wave-induced vessel motions, which have never been investigated before. A nonlinear finite element model of the coupled drill...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3222
... Abstract Investigated was the lock–in case of the vortex–induced vibration of an oscillating circular cylinder in a circulating water channel subjected to a reduced velocity flow of 5.18 at a Reynolds number of 5×10 4 . The coupled dynamic inline and transverse response of the cylinder...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3217
...). The flow–structure interactions for such a near–wall cylinder have been intensively investigated by numerous researchers with wide engineering applications, e.g., the on–bottom stability (see Gao, 2017), the local scour (see Freds∅e et al., 1987; Gao et al., 2006), and the vortex–induced vibrations...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3216
... Abstract This paper develops a comprehensive method to make the riser vibration simulation more efficiently and closer to reality. The dynamic control equation contains the coupling vibration in both inline (IL) and crossflow (CF) directions and is solved by Matlab programs. In order...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3215
... Abstract Theoretically, the vortex–induced vibration, caused by the trailing vortex shedding in flows around the blunt body, is probably major reason for structural fatigue damage. An effective way in engineering is to attach a thin plate in the wake of the blunt rigid body, that can reduce...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3214
... Abstract The Vortex-induced vibration (VIV) prediction of long flexible cylindrical structures relies on the accuracy of the hydrodynamic database constructed via rigid cylinder forced vibration experiments. However, to create a comprehensive hydrodynamic database with tens of input parameters...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3226
... cylinder movement is only allowed in the direction perpendicular to the incoming flow. The vibration is suppressed for α=30°, and galloping is observed for α=60°. Regarding wake dynamics, the vortex shedding in the galloping range is significantly different from the traditional vortex–induced vibration...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3225
... Abstract Vortex–Induced Vibration (VIV) is an important problem that can be seen in offshore structures such as drilling riser. VIV occurred due to synchronization (lock–in) of the vortex shedding and natural frequency of the structure. The lock–in phenomenon is normally observed...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-3224
... Abstract In this paper, the forced vibration and vortex induced vibration of a cylinder under the combined action of uniform flow and oscillatory flow were numerically simulated by using dynamic grid technology. The effects of the distance between the cylinder and the wall and the number...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-1126
... was obviously synchronous with the tidal height curve. However; there were some other unknown effects. We used the frequency domain decomposition (FDD) method to extract the natural frequencies from the monitored structural vibration responses and to compare the data with records of the environmental conditions...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-1139
... the unknown disturbance. To further suppress the residual vibration; an optimal control scheme is proposed. The dynamic modelling and controlling of underwater manipulators are developed in ADAMS and SIMULINK. The simulation results show that the output position is converged to the desired trajectory quickly...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-1149
... Abstract The mechanics property of the bearing has important influence on the fatigue, vibration and noise of the underwater vehicle propulsion shafting system. The damping water lubricated stern bearing was recommended, and the corresponding simulation model of the damping stern bearing...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-2135
... unstable if the support point undergoes an up-anddown motion with its frequency and amplitude satisfying certain conditions, and his study introduced the parametric instability of risers into public focus. Meanwhile, the vibration of a long pipe conveying fluid has been proposed (Chen S, 1972; Edelstein WS...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-2137
... accurate screening tool for allowable free span lengths and fatigue from Vortex Induced Vibrations (VIV). A formula is developed to directly calculate the fatigue life in a pipe span under different boundary conditions. Both maximum and minimum span lengths are identified. Results are checked by FE modal...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-1201
... on structural vibration monitoring by the mast. To better understand the dynamics of marine structures under force, it is necessary to measure the interactions between these structures and the surrounding environment. The main purpose of the mast is to enable long-term structural vibration monitoring...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-2193
..., to explore the sensitivity to export pressure. The tests consisted of measuring several variables of interest, next to the existing process conditions. These are the dynamic pressure pulsations at the riser hang-off location, as well as vibration levels at selected critical locations. The results...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-3220
... ABSTRACT Three-dimensional numerical simulations of a single smooth cylinder supported by linear spring system are carried out by the fluid-structure interaction (FSI) solver naoe-FOAM-SJTU using Delayed Detached- Eddy Simulation (DDES). The cylinder can only vibrate in the direction...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-1164
... ABSTRACT Offshore wind turbines located in sea ice zones are subjected to severe ice-induced vibration. The present study uses a three-dimensional pendulum tuned mass damper (3d-PTMD) to mitigate the nacelle/tower and foundation dynamic response under the combined action of wind and ice loading...

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