A numerical simulation model for the vortex induced vibration of flexible risers using dynamic stiffness matrices

Pang, Jianhua; Zhu, Baoshan; Zong, Zhi

doi:10.1016/j.oceaneng.2019.03.007

Cited by 12 publications

(4 citation statements)

References 24 publications

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“…Marine flexible risers are important components that connect underwater oil wells and offshore platforms, and are also a weak link in offshore oil transportation. Due to its unique working environment, the phenomenon of riser vibration will be difficult to avoid, and vibration will cause riser fatigue, shorten its working life, increase its production costs, and may bring fatal safety production risks [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

Vibration Control of Marine Flexible Riser with Uncertain Model

Chen,

Zhang,

Zhou

et al. 2023

AJST

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When flexible risers in the ocean are subjected to various environmental loads in the ocean, vibration will inevitably occur. Due to the nonlinearity and uncertainty of the actual riser system, it is impossible to obtain an accurate mathematical model of the riser system. The existing control algorithms designed based on the precise model of the riser system cannot meet the actual control requirements. A flexible riser boundary control method based on fuzzy control algorithm is proposed to suppress the vibration of marine flexible riser systems with uncertain models. Firstly, the dynamic models of existing marine flexible risers were studied. In response to the uncertainty of the riser system model, the control experience was transformed into an automatic control strategy in the form of fuzzy language control rules to improve the adaptability of the controller. Then, combining boundary control technology with fuzzy control, a boundary controller is constructed to stabilize the riser in a small neighborhood of its original position and reduce fatigue damage to the riser. Finally, the effectiveness of the designed fuzzy boundary control algorithm was verified through MATLAB simulation results, and the vibration suppression effect of the algorithm on the vertical tube was better than that of traditional PD control.

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Section: Introductionmentioning

confidence: 99%

Vibration Control of Marine Flexible Riser with Uncertain Model

Chen,

Zhang,

Zhou

et al. 2023

AJST

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“…In recent years, the dynamic analysis and vibration control design of flexible riser systems have made important achievements. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] For the practical marine flexible riser system, there often exist input nonlinearities which include the input deadzone, 22,23 saturation, 2,24,25 backlash, 26,27 hysteresis, 28,29 parameter uncertainty, and so on. These nonlinearities and uncertainty often lead to deterioration of system performance.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the dynamic analysis and vibration control design of flexible riser systems have made important achievements. 4–21…”

Section: Introductionmentioning

confidence: 99%

Adaptive fuzzy backstepping control of flexible marine riser with uncertain parameters and input saturation constraint

Wan

Zhou

Zhang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part I:

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To suppress the vibration of a flexible riser system with input saturation and uncertain parameters under the influence of unknown external disturbances, an adaptive fuzzy backstepping boundary control algorithm was designed. First, the backstepping method and Lyapunov function are used to analyze the subsystem and design the virtual control law. On this basis, the adaptive fuzzy system was designed to approximate the unknown nonlinear term in the design process, and the smooth hyperbolic tangent function and the auxiliary system based on Nussbaum function were introduced to limit control input. The stability and uniform boundedness of the closed-loop control system are proved by the Lyapunov stability theory without simplifying or discretizing the infinite dimensional dynamic model. Finally, the effectiveness of the proposed control algorithm is verified by comparing the control effect with proportional–integral–derivative control and the previous adaptive backstepping control by MATLAB simulation. The simulation results show that the proposed control algorithm can overcome the uncertainty of system parameters and effectively suppress the riser vibration under input constraints, and its control effect is better than proportional–integral–derivative control and adaptive backstepping control.

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“…Recent progress in the development of discrete vortex methods has particularly concentrated on improvements in the accuracy of numerical results and the high resolution of wake fields [7][8][9][10][11][12][13][14][15][16]. Some of the literature has also focused on the extension of the vortex method, such as solving structural deformations via coupling with the finite element method [17][18][19][20][21]. In vortex methods, vortices already in the fluid can leak into the body owing to random walk, which causes serious damage to the streamlined body surface.…”

Section: Introductionmentioning

confidence: 99%

Conformal Mapping-Based Discrete Vortex Method for Simulating 2-D Flows around Arbitrary Cylinders

Guo

Sun

Zong

et al. 2021

JMSE

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A novel technique based on conformal mapping and the circle theorem has been developed to tackle the boundary penetration issue, in which vortex blobs leak into structures in two-dimensional discrete vortex simulations, as an alternative to the traditional method in which the blobs crossing the boundary are simply removed from the fluid field or reflected back to their mirror-image positions outside the structure. The present algorithm introduces an identical vortex blob outside the body using the mapping method to avoid circulation loss caused by the vortex blob penetrating the body. This can keep the body surface streamlined and guarantees that the total circulation will be constant at any time step. The model was validated using cases of viscous incompressible flow passing elliptic cylinders with various thickness-to-chord ratios at Reynolds numbers greater than Re = 1 × 105. The force and velocity fields revealed that this boundary scheme converged, and the resultant time-averaged surface pressure distributions were all in excellent agreement with wind tunnel tests. Furthermore, a flow around a symmetrical Joukowski foil at Reynolds number Re = 4.62 × 104, without considering the trailing cusp, was investigated, and a close agreement with the experimental data was obtained.

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A numerical simulation model for the vortex induced vibration of flexible risers using dynamic stiffness matrices

Cited by 12 publications

References 24 publications

Vibration Control of Marine Flexible Riser with Uncertain Model

Vibration Control of Marine Flexible Riser with Uncertain Model

Adaptive fuzzy backstepping control of flexible marine riser with uncertain parameters and input saturation constraint

Conformal Mapping-Based Discrete Vortex Method for Simulating 2-D Flows around Arbitrary Cylinders

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